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Temperature difference controller LTDC
Installation and operating instructions
Read carefully before installation, commissioning and operation
CONTENT
Safety Instructions 4
EU-Conformity 4
General Instructions 4
Explanation of Symbols 4
Changes to the Unit 5
Warranty and Liability 5
Disposal and Pollutants 5
Description LTDC 5
About the Controller 5
Technical Data 6
Scope of Supply 7
Hydraulic Variants 7
Installation 10
Electrical Terminals 10
Electrical Terminals 11
wall Installation 25
Electrical Connection 26
Installing the Temperature Sensors 26
Temperature Resistance Table for Pt1000 Sensors 26
Operation 27
Display and Input 27
Commissioning help 28
1. Measurement values 28
2. Statistics 29
Operating hours 29
Heat quantity 29
Graphic overview 29
Message Log 29
Reset / Clear 29
3. Operating Mode 30
Auto 30
Manual 30
Aus 30
4. Settings 30
Tmin S1 30
Priority Storage X 30
ΔT Solar S(X) 31
Tmin S2 31
Tmin Storage X 31
Priority temperature 31
Loading time 31
Increase 31
5. Protective Functions 32
System protection 32
Collector protection 32
Recooling 32
Frost Protection 32
Seizing Protection 32
Collector alarm 33
Pressure Monitoring 33
6. Special Functions 33
Program selection 33
Pump settings 33
Signal type 33
Profile 33
Speed control 33
Variant 33
Purging time 34
Sweep time 34
Max. Speed 34
Min. Speed 34
Setpoint 34
Relay functions 34
Solar bypass 35
Solar bypass 35
Variant 35
Bypass sensor 35
Thermostat 35
Tset 35
Hysteresis 35
Thermostat sensor 1 35
Thermostat sensor 2 35
Teco 35
Energy Saving Mode 35
Thermostat enable 35
Cooling 36
Tset 36
Hysteresis 36
Cooling sensor 36
Release times 36
Return flow increase 36
Return flow increase 36
Return flow increase Tmax 36
∆T Return flow 36
Return flow sensor 36
Storage sensor 36
Field cooling 36
Field cooling sensor 36
Hys max 37
Hys min 37
Tmax field 37
Anti-Legionella 37
Heat transfer 37
Heat transfer 38
Δ T Heat transfer 38
Heat Transfer Tmax 38
Heat Transfer Tmin 38
Source 38
Drain 38
Difference 38
Difference 38
Δ T Difference 38
DF-Source 38
Tmin Source 38
DF-Drain 38
Tmax Drain 38
Solid fuel boiler 38
Solid fuel boiler Tmin 38
ΔT Solid fuel boiler 39
Solid fuel boiler Tmax 39
Boiler sensor of this function 39
Storage sensor 39
Error Messages 39
Error message 39
Pressure monitor 39
Pressure monitor 39
RPS-Type 39
RPS Min 39
RPS Max 39
Booster Pump 39
Booster Pump 39
Charge time 40
Parallel operation R1/R2 40
Parallel operation 40
Delay 40
Follow-up time 40
Always on 40
Heating circuit 40
Room sensor 40
Room Reference (Night) 40
Room Reference (Day) 40
Release Times 40
Heat quantity 40
Flow temperature sensor (X) 41
Return flow sensor 41
Glycol type 41
Glycol percentage 41
Flow rate supply flow (X) 41
Offset ∆T 41
VFS (X) 41
VFS - Position 41
Reference sensor 41
Sensor Calibration 41
Commissioning 41
2
Factory settings 42
Time & Date 42
Starting aid 42
Purging time 42
Increase 42
Global radiation sensor 42
Radiation sensor 42
Radiation intensity 42
Blocking time 42
Daylight saving time 42
Eco Display Mode 42
Temperature unit 43
Network 43
Access Control 43
Ethernet 43
CAN bus ID 43
Sensor send interval 43
7. Menu Lock 44
8. Service Values 44
9. Language 44
Malfunctions/Maintenance 45
Additional Information 46
External relay at signal output V(X) (0-10V / PWM) 46
CAN bus 46
Drain Back 46
Appendix 47
Signal 47
Profile 47
Output Signal 47
PWM / 0-10V off 47
PWM / 0-10V on 47
PWM / 0-10V max. 47
Speed when „On“ 47
Example for signal settings 47
Technical data PWM and 0-10V 48
Show signal 48
Tips 48
Final Declaration 49
3
Safety Instructions
EU-Conformity
By affixing the CE mark to the unit the manufacturer declares that theLTDC conforms to the following relevant safety regulations:
lEU low voltage directive 2014/35/EU
lEU electromagnetic compatibility directive 2014/30/EU
conforms. Conformity has been verified and the corresponding documentation and the EU declaration of conformity are kept on file by the
manufacturer.
General Instructions
Please read carefully!
These installation and operating instructions contain basic instructions and important information regarding safety, installation, com-
missioning, maintenance and the optimal use of the unit. Therefore these instructions must be read and understood completely by the install-
ation technician/specialist and by the system user before installation, commissioning and operation of the unit.
This unit is an automatic, electrical Temperature difference controller for/insolar or heating system and similar applications. Install the unit
only in dry areas and under the ambient conditions described in “Specifications”.
The valid accident prevention regulations, VDE regulations, the regulations of the local power utility, the applicable DIN-EN standards and
the installation and operating instruction of the additional system components must also be observed.
Under no circumstances does the unit replace any safety devices to be provided by the customer!
Installation, electrical connection, commissioning and maintenance of the device may only be carried out by an appropriately trained spe-
cialist. Users: Make sure that the specialist gives you detailed information on the function and operation of the unit. Always keep these instruc-
tions in the vicinity of the unit.
The manufacturer does not take over any liability for damage caused through improper usage or non-compliance of this manual!
Explanation of Symbols
Danger
Failure to observe these instructions can result in electrocution.
Danger
Failure to observe these instructions can result in serious damage to health such as scalding or life-threatening injuries.
Caution
Failure to observe these instructions can result in destruction of the unit or the system, or environmental damage.
Caution
Information which is especially importation for the function and optimal use of the unit and the system.
Changes to the Unit
lChanges, additions to or conversion of the unit are not permitted without written permission from the manufacturer.
lIt is likewise forbidden to install additional components that have not been tested together with the unit.
lIf it becomes clear that safe operation of the unit is no longer possible, for example because of damage to the housing, turn the Unit off
immediately.
lAny parts of the unit or accessories that are not in perfect condition must be exchanged immediately.
lUse only original spare parts and accessories from the manufacturer.
lMarkings made on the unit at the factory must not be altered, removed or made illegible.
lOnly the settings described in these instructions may be set using the Unit.
Changes to the unit can compromise the safety and function of the unit or the entire system.
Warranty and Liability
The unit has been manufactured and tested with regard to high quality and safety requirements. The unit is subject to the statutory guar-
antee period of two years from the date of sale. The warranty and liability shall not include, however, any injury to persons or material dam-
age that is attributable to one or more of the following causes:
lFailure to observe these installation and operating instructions.
lImproper installation, commissioning, maintenance and operation.
lImproperly executed repairs.
lUnauthorised structural changes to the unit.
lUse of the device for other than its intended purpose.
lOperation above or below the limit values listed in the ‚Specifi cations‘ section.
lForce majeure.
Disposal and Pollutants
The unit conforms to the European RoHS 2011/65/EU for the restriction of the use of certain hazardous substances in electrical and elec-
tronic equipment.
Under no circumstances may the device be disposed of with the normal household waste. Dispose of the unit only at appro-
priate collection points or ship it back to the seller or manufacturer.
Description LTDC
About the Controller
The Temperature difference controller LTDC facilitates efficient use and function control of your solar or heating system possible while its
handling is intuitive. After every input step the suitable functions are matched to the keys and explained in a text above. In the menu 'meas-
urement values and settings' are help text and graphics in addition to key words.
The LTDC can be used for the various system variants, See " Hydraulic Variants " on page 7
Important characteristics of the LTDC are:
lDepiction of graphics and texts using a lit display.
lSimple viewing of the current measurement values.
lStatistics and system monitoring by means of statistical graphics
lExtensive setting menus with explanations.
lMenu block can be activated to prevent unintentional setting changes.
lResetting to previously selected values or factory settings.
Technical Data
Electrical specifications:
Power Supply 100 - 240VAC,50 - 60 Hz
Power consumption / standby 0,5 W - 2,5 W/0,5 W
Internal fuse 1 1
Protection Class IP40
Protection Class II
Overvoltage category II
Degree of pollution category II
Inputs/Outputs Measuring range
Sensor inputs 6 Pt1000 -40 °C ... 300 °C
Sensor inputs
Flow sensors
2 Grundfos Direct Sensor or SIKA Vortex
Flow Sensor
0°C - 100°C | 2...40 l/min
VFS type in l/min 1 - 20, 2 - 40, 5 - 100, 10 - 200, 20 - 400
RPS type in bar 0 - 0.6, 0 - 1, 0 - 1.6, 0 - 2.5, 0 - 4,
0 - 6, 0 - 10
VVX 15 in l/min 2 - 40
VVX 20 in l/min 5 - 80
VVX 25 in l/min 7 - 150
Version 1 Version 2 Version 3 Version 4
Pt1000 Measuring range -40 °C ... 300 °C 5 5 6 6
Sensor input VFS / RPS 0 0 2 2
mechanical relay as alternating contact (R)
460VA for AC1 / 460W for AC3
1 1 1 1
mechanical relay 230V 2 1 2 0
electronic relay min. 5W ... max. 120W for AC3 0 2 0 2
0-10V output (Tolerance +/- 10%) 10 load V1 V1 V1-V2 V1-V2
PWM output freq. 1 kHz, level 10 V V1 V1 V1-V2 V1-V2
Max. Cable Length
Collector sensor S1 < 30 m
Flow sensors < 3 m
CAN < 3 m; at >= 3 m, a shielded twisted pair cable must be used. Isolate shielding and
connect it to the protective conductor of only one of the devices. Max. cable length
of the complete system 200 m.
0-10V/PWM < 3 m
Interface
Fieldbus CAN
Permissible Ambient Conditions
for controller operation 0 °C - 40 °C, max. 85 % rel. humidity at 25 °C
for transport/storage 0 °C - 60 °C, no moisture condensation permitted
Other Specifications and Dimensions
Housing Design 2-part, ABS plastic
Installation Methods Wall installation, optionally panel installation
Overall dimensions 163 mm x 110 mm x 52 mm
Aperture installation dimen-
sions
157 mm x 106 mm x 31 mm
Display Fully graphical display, 128 x 64 dots
Light diode multicolour
Real Time Clock RTC with 24 hour power reserve
Operation 4 entry keys
Scope of Supply
lSolar multi-circuit controllers LTDC
l3 screws 3,5 x 35 mm and 3 plugs 6 mm for wall installation.
l6 strain relief clips with 12 screws, replacement fuse 1 x T2A / 250V
lLTDC installation and operating instructions
Optionally contained depending on design/order:
lPt1000 temperature sensor and submersing cases
lCAN Bus Accessories: Datalogger with Ethernet connection
Hydraulic Variants
The following illustrations should be regarded only as schematic representations of the respective hydraulic systems and do not claim to be complete. Under no cir-
cumstances should the controller replace any safety devices. Depending on the specific application, additional system and safety components such as check
valves, non-return valves, safety temperature limiters, scalding protectors, etc., may be required.
For 3-way valves, the flow direction in energized state (relay active) is shown in the used hydraulic version.
Solar with reservoir Solar with pool Solid fuel boiler with storage
Storage transfer Heating circuit return flow increase Thermostat
Universal Delta T Shutoff valve Solar with pool and heat exchanger 1
Solar with thermostat (auxiliary heat-
ing)
Solar with two-zone storage Solar with heating circuit
Solar with bypass Solar with heat exchanger Solar with 2 collector surfaces
Solar with 2 collectors and 2 pumps Solar with 2 storages and switching valve Solar with 2 storages and 2 pumps
Solar with storage transfer Solar with pool and heat exchanger 2 Solar with thermostat and switching valve
Solar and solid-fuel boiler Solar with cooling 1 (collector cooling) Solar with cooling 2 (collector cooling)
Solar with cooling 3 (collector cooling) Solar with heat exchanger, two-zone stor-
age and valve
Solar with heat exchanger, 2 storages
and valve
Solar with pool, storage and heat
exchanger
Solar with storage and solid-fuel boiler
and S4
2x Solar
Solar with thermostat and heat trans-
fer
Solar with thermostat and return flow
increase
Solar with 2 collector surfaces, 2 storages
and 2 valves
Solar with 2 collector surfaces, 2 stor-
ages and 2 pumps
Solar with pool, storage and heat
exchanger
Solar with 3 storages and 3 pumps
Solar with 3 storages and 2 switching
valve
Solar with heat exchanger Solar with heat exchanger, two-zone storage
and valve
Solar with heat exchanger, 2 storages
and valve
Solar with 2 collector surfaces, heat
exchanger and 3 pumps
Solar with 2 collector surfaces, heat exchanger
and 2 pumps
Installation
Electrical Terminals
Low voltages
max. 12 VAC / DC
Mains voltages
230 VAC 50 - 60 Hz
On the control board
LTDC Version V3 + V4:
VFS1 Grundfos Direct Sensor
VFS2 Grundfos Direct Sensor
LTDC Version V1 + V4:
CAN CAN bus connection (1=high,2=low)
CAN CAN bus connection (1=high,2=low)
Terminal: Connection for:
S1 Temperature Sensor 1
S2 Temperature Sensor 2
S3 Temperature Sensor 3
S4 Temperature Sensor 4
S5 Temperature Sensor 5
V1 speed controlled output for 0-10V / PWM high-effi-
ciency pumps
LTDC Version V3 + V4:
V2 0-10V / PWM signal output e.g. for con-
trolling high-efficiency pumps
S6 Temperature Sensor 6
+12V Power supply
The connection of the ground wire is made at the lower gray terminal
block.
Terminal: Connection for:
N Neutral conductor N
L Network outer conductor L
R1 Relays 1
R2 Relays 2
R3| Relays 3|
R3 Relays 3
The neutral conductor N must be connected to the N terminal
block.
The PE protective conductor must be connected to the PE metal
terminal block!
In high-efficiency pumps with 0-10V / PWM signal input, the power
supply must go through the corresponding relay (V1 -> R1, R2 ->
V2), because the relay turns on and off together with the control
signals.
At R3I are permanently 230v when the relay is inactive. Wrong wiring can damage the connected components.
"Connection of PWM pumps"
PWM pumps are connected to the controller with 2 wires 1) PWM Input (default: brown) 2) GND (default: blue). Some pumps have
a third wire (PWM Output Signal (default: black)). This is not used for the connection!
Electrical Terminals
For high-efficiency pumps with 0-10V / PWM signal input, the power can be provided (V1 parallel operation) over a free relay.
The connection of the ground wire is made at the lower gray terminal block. The neutral conductor N is connected to terminal
block N. The PE protective conductor must be connected to the PE metal terminal block!
Program 1 Solar with storage
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
V1 Solar pump
Program 2 Solar with pool
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Pool sensor R1 Solar pump
V1 Solar pump
Program 3 Solid fuel boiler with storage
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Sensor solid fuel boiler L Network outer conductor L
S2 Storage sensor R1 Storage loading pump
V1 Storage loading pump
Program 4 Storage transfer
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Storage sensor L Network outer conductor L
S2 Storage sensor R1 Storage loading pump
V1 (optional)
Program 5 Heating circuit return flow increase
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Return flow
sensor
R3| (NC) optional instead of R3
R3 Return flow increase (NO)
Shown valve state: R3I with current, R3 without current
Program 6 thermostat
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Storage sensor
(top)
L Network outer conductor L
S2 Storage sensor bot-
tom
R3| (NC) optional instead of R3
R3 Thermostat (NO)
Program 7 ΔT Universal
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 DF-Source L Network outer conductor L
S2 DF-Drain R1 Temperature difference
V1 (optional)
Program 8 Shutoff valve
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Flow temperature
sensor
L Network outer conductor L
S2 Storage sensor R3| (NC) optional instead of R3
R3 Valve (NO)
Program 9 Solar with heat exchanger and pool
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Pool sensor R1 Pump
S4 Pool flow sensor
V1 Pump
Program 10 Solar with thermostat
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer con-
ductor L
S2 Storage sensor bot-
tom
R2 Solar and pool pump
S3 Storage sensor (top) R3| (NC) optional instead of
R3
V1 Solar and pool pump R3 Thermostat (NO)
Program 11 Solar with 2 zone storage
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor
(top)
R1 Solar pump
S3 Storage sensor bot-
tom
R3| (NC) optional instead of
R3
V1 Solar pump R3 Switchover to zone S3
(NO)
Shown valve state: R3I with current, R3 without current
Program 12 Solar with return flow increase
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor bot-
tom
R1 Solar pump
S3 Storage sensor
(top)
R3| (NC) optional instead of
R3
S4 Return flow sensor R3 Return flow increase (NO)
V1 Solar pump
Shown valve state: R3I with current, R3 without current
Program 13 Solar with bypass
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S3 Flow temperature
sensor
R3| (NC) optional instead of R3
V1 Solar pump R3 Bypass active (NO)
Shown valve state: R3I with current, R3 without current
Program 14 Solar with heat exchanger
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S4 Flow temperature
sensor
R2 Storage loading pump
V1 Solar pump
V2 Storage loading
pump
Program 15 Solar with 2 collector surfaces
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S5 Collector sensor R3| (NC) optional instead of R3
V1 Solar pump R3 Switchover to collector S5 (NO)
Shown valve state: R3I with current, R3 without current
Program 16 Solar with 2 collector surfaces and 2 pumps
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor R1 Pump (collector S1)
S5 Collector sensor R2 Pump (collector S5)
V1 Pump (collector S1)
V2 Pump (collector S5)
Program 17 Solar with 2 storages and switching valve
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S3 Storage sensor R3| (NC) optional instead of R3
V1 Solar pump R3 Switchover to storage S3 (NO)
Shown valve state: R3I with current, R3 without current
Program 18 Solar with 2 storages and 2 pumps
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Pump (S2)
S3 Storage sensor R2 Pump (S3)
V1 Pump (S2)
V2 Pump (S3)
Program 19 Solar with transfer
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor bottom R1 Solar pump
S3 Storage sensor (top) R2 Storage loading pump
S4 Storage top
V1 Solar pump
V2 Storage loading pump
Program 20 Solar with pool and heat exchanger
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Pool sensor R1 Solar pump
S4 Pool flow sensor R2 Pool pump
V1 Solar pump
V2 Pool pump
Program 21 Solar with domestic hot water reheating
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor bot-
tom
R1 Solar pump
S3 Storage sensor (top) R3| (NC) optional instead of
R3
V1 Solar pump R3 Deactivate DHW reheat-
ing (NO)
Shown valve state: R3I with current, R3 without current
Program 22 Solar and solid-fuel boiler
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer con-
ductor L
S2 Storage sensor R1 Solar pump
S3 Sensor solid fuel
boiler
R2 Solid fuel boiler
pump
V1 Solar pump
V2 Solid fuel boiler pump
Program 23 Solar with collector field cooling (overheating)
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
V1 Solar pump R2 Cooling
Program 24 Solar with collector cooling according to set temperature
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor R1 Solar pump
V1 Solar pump R3| (NC) optional instead of
R3
R3 Cooling (NO)
Program 25 Solar with storage cooling according to target temperature
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer con-
ductor L
S2 Storage sensor bottom R1 Solar pump
S3 Storage sensor (top) R2 Cooling
V1 Solar pump
V2 Cooling
Program 26 Solar with heat exchanger, 2-zone storage and valve
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor (top) R1 Pump
S3 Storage sensor bot-
tom
R2 Storage loading pump (sys-
tem separation)
S4 Flow temperature
sensor
R3| (NC) optional instead of R3
V1 Solar pump R3 Loading storage S2 (NO)
V2 Storage loading
pump (system sep-
aration)
Shown valve state: R3I with current, R3 without current
Program 27 Solar with heat exchanger, 2 storages and valve
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor R1 Solar pump
S3 Storage sensor R2 Storage loading pump
(system separation)
S4 Flow temperature
sensor
R3| (NC) optional instead of
R3
V1 Solar pump R3 Loading storage S2 (NO)
V2 Storage loading pump
(system separation)
Shown valve state: R3I with current, R3 without current
Program 28 Solar with pool, storage and heat
exchanger
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S3 Pool sensor R3| (NC) optional instead of R3
S4 Pool flow sensor R3 Switchover and loading pool
(NO)
V1 Solar pump
Shown valve state: R3I with current, R3 without current
Program 29 Solar and solid-fuel boiler and S4
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor bottom R1 Solar pump
S3 Sensor solid fuel boiler R2 Solid fuel boiler pump
S4 Storage sensor (top)
V1 Solar pump
V2 Solid fuel boiler pump
Program 30 2 x Solar
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Pump collector S1
S3 Storage sensor R2 Pump collector S5
S5 Collector sensor
V1 Pump collector S1
V2 Pump collector S5
Program 31 Solar with thermostat and transfer
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Buffer sensor L Network outer conductor L
S2 Storage bottom R1 Solar pump
S3 Storage top R2 Storage loading pump
S4 Storage top R3| (NC) optional instead of R3
V1 Solar pump R3 Thermostat (NO)
V2 Storage loading
pump (optional)
Program 32 Solar with thermostat and return increase
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor bottom R1 Solar pump
S3 Storage sensor (top) R2 Thermostat
S4 Return flow sensor R3| (NC) optional instead of R3
V1 Solar pump R3 Return flow increase
V2 Thermostat (optional)
Shown valve state: R3I with current, R3 without current
Program 33 Solar with 2 collectors, 2 storages and 2 valves
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer con-
ductor L
S2 Storage sensor R1 Solar pump
S3 Storage sensor R2 Collector switchover
S5 Collector sensor R3| (NC) optional instead
of R3
V1 Solar pump R3 Storage transfer to S3
(NO)
Shown valve state: R2 no current, R3I current, R3 no current
Program 34 Solar with 2 collectors and 2 storages and 2 pumps
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor R1 Solar pump S1
S3 Storage sensor R2 Solar pump S5
S5 Collector sensor R3| (NC) optional instead of
R3
V1 Solar pump S1 R3 Switchover S3 (NO)
V2 Solar pump S5
Shown valve state: R3I with current, R3 without current
Program 35 Solar with pool, storage and heat exchanger
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer con-
ductor L
S2 Storage sensor R1 Pump
S3 Pool sensor R2 Pool loading
S4 Pool flow sensor R3| (NC) optional instead of
R3
V1 Solar pump R3 Switchover to pool (NO)
V2 Pool loading
Shown valve state: R3I with current, R3 without current
Program 36 Solar with 3 storages and 3 pumps
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor
L
S2 Storage sensor R1 Pump (S2)
S3 Storage sensor R2 Pump (S3)
S4 Storage sensor R3| (NC) optional instead of
R3
V1 Pump (S2) R3 Pump (S4) (NO)
V2 Pump (S3)
Program 37 Solar with 3 storages and 3 valves
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S3 Storage sensor R2 Switchover to S3
S4 Storage sensor R3| (NC) optional instead of R3
V1 Solar pump R3 Switchover to S4
Shown valve state: R2 no current, R3I current, R3 no current
Program 38 Solar with heat exchanger
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer con-
ductor L
S2 Storage sensor R1 Solar pump
S4 Flow temperature sensor R2 Storage loading pump
S5 Solar return flow (optional)
V1 Solar pump
V2 Storage loading pump
S6 Flow sensor storage load-
ing
II VFS2 (optional)
Program 39 Solar with heat exchanger, 2-zone storage and valve
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer con-
ductor L
S2 Storage sensor (top) R1 Solar pump
S3 Storage sensor bottom R2 Storage loading pump
S4 Flow temperature sensor R3| (NC) optional instead of
R3
S5 Solar return flow
(optional)
R3 Switchover to zone S2
(NO)
V1 Solar pump
V2 Storage loading pump
S6 Flow sensor storage load-
ing
II VFS2 (optional)
Shown valve state: R3I with current, R3 without current
Program 40 Solar with heat exchanger, 2 storages and
valve
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Buffer sensor L Network outer con-
ductor L
S2 Storage sensor R1 Solar pump
S3 Storage sensor R2 Storage loading pump
S4 Flow temperature
sensor
R3| (NC) optional instead of
R3
S5 Solar return flow
(optional)
R3 Switchover to storage
S2
V1 Solar pump
V2 Storage loading pump
S6 Flow sensor storage
loading
II VFS2 (optional)
Shown valve state: R3I with current, R3 without current
Program 41 Solar with 2 collector surfaces, heat exchanger and 3 pumps
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S4 Flow temperature
sensor
R2 Storage loading pump
S5 Collector sensor R3| (NC) optional instead of R3
V1 Solar pump R3 Solar pump (collector S5) (NO)
V2 Storage loading
pump
Program 42 Solar with 2 collector surfaces, heat exchanger and 2 pumps
Terminal: Connection: Terminal: Connection:
- GND N Neutral conductor N
S1 Collector sensor L Network outer conductor L
S2 Storage sensor R1 Solar pump
S4 Flow temperature
sensor
R2 Storage loading pump
S5 Collector sensor R3| (NC) optional instead of R3
V1 Solar pump R3 Switchover to collector S5
(NO)
V2 Storage loading pump
Shown valve state: R3I with current, R3 without current
wall Installation
1. Unscrew cover screw completely.
2. Carefully pull upper part of housing from lower part. During the
removal, the brackets are released as well.
3. Set upper part of housing aside. Do not touch the electronics.
4. Hold the lower part of the housing in the selected position and
mark the 3 mounting holes. Make sure that the wall surface is as
even as possible so that the housing does not become distorted
when screwed on.
5. Using a drill and size 6 bit, drill three holes at the points marked
on the wall and push in the plugs.
6. Insert the upper screw and screw it in lightly.
7. Fit the upper part of the housing and insert the other two screws.
8. Align the housing and tighten the three screws.
1. Open the terminal cover.
2. Strip lines a max. of 55 mm, assemble the strain reliefs, strip wire
ends 8-9 mm.
3. Open clamps with a fitting screwdriver and connect electrical sys-
tem to the controller.
4. Clip on the terminal cover again and close it with the screw.
5. Turn on mains supply and put the controller into operation.
If problems occur with the operation of the terminals, our video on our YouTube page can help you:
http://www.sorel.de/youtube
Electrical Connection
Before working on the unit, switch off the power supply and secure it against being switched on again! Check that there is no
power flowing! Electrical connections may only be made by a specialist and in compliance with the applicable regulations. The
unit may not be put into operation if there is visible damage to the housing, e.g. cracks.
The unit may not be accessible from behind.
Low-voltage cables such as temperature sensor cables must be routed separately from mains voltage cables. Feed temperature
sensor cables only into the left-hand side of the unit, and mains voltage cables only into the right-hand side.
The customer must provide an all-pole disconnecting device, e.g. an emergency heating switch.
The cables being connected to the unit must not be stripped by more than 55 mm, and the cable jacket must reach into the hous-
ing just to the other side of the strain relief.
Installing the Temperature Sensors
The controller operates with Pt1000 temperature sensors which are accurate to 1 °C, ensuring optimal control of system functions.
If desired, the sensor cables can be extended to a maximum of 30 m using a cable with a cross-section of at least 0.75 mm².
Ensure there is no contact resistance! Position the sensor precisely in the area to be measured! Only use immersion, pipe-
mounted or flat-mounted sensors suitable for the specific area of application with the appropriate permissible temperature
range.
Low-voltage cables such as temperature sensor cables must be routed separately from mains voltage cables. Feed temperature
sensor cables only into the left-hand side of the unit, and mains voltage cables only into the right-hand side.
Temperature Resistance Table for Pt1000 Sensors
°C -20 -10 0 10 20 30 40 50 60 70 80 90 100
Ω 922 961 1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385
Operation
Display and Input
Pump (rotates when active)
Valve (direction of flow black)
Collector
Storage / buffer
Solid fuel boiler
Pool
Thermostat On/Off
Temperature Sensors
heat exchanger
Further symbols can be found in the special functions
Examples for key settings:
+/- Increase / decrease values
▼/▲ Scroll menu down / up
Yes/No agree / reject
About further information
Back to the previous display
Ok Confirm selection
Confirm Confirm setting
The display‘s (1), extensive text and graphical mode, enables
simple, almost self-explanatory, operation of the controller.
The LED (2) lights up green when the primary pump is switched
on (automatic mode). The LED (2) lights up red when operating
mode ‚Off‘ is set. The LED (2) flashes quickly red when an error is
present.
The function of the other 3 keys (4) is shown in the display right
above the keys. The right-hand key generally has a confirmation
and selection function.
The graphics mode appears if not key is pressed for 2 minutes or
after exiting the main menu with ‘esc’.
Hitting the "esc" key in the graphics mode takes you directly to the
main menu.
Commissioning help
1. Set language and time
2. Commissioning help / setup wizard
a) select or
b) skip.
The setup wizard guides through the necessary basic settings in the correct order.
Every parameter is explained on the display of the controller. Pressing the “esc” key
takes you back to the previous setting.
b) With free commissioning the settings should be made in the following order:
lMenu 9. Language
lmenu 3. Operating hours
lMenu 4. Settings, all values
lMenu 5. Protection Functions (if any adjustments necessary).
lmenu 6. Special Functions (if any adjustments necessary).
3. In menu operating mode "3.2. Manual”, test the witch outputs with the consumers
connected and check the sensor values for plausibility. Then set to automatic
mode.See " Manual " on page 30
The setup wizard can be accessed in menu 6.11. at any time.
Consider the explanations for the individual parameters on the following pages and check if further settings are necessary for
your application.
1. Measurement values
Serve to display the current measured temperatures.
If ‚error‘ appears on the display instead of the measurement value,
there may be a defective or incorrect temperature sensor.
If the cables are too long or the sensors are not well-placed, small devi-
ations in the measurement values may occur. In this case, the display
values can be compensated by adjustments in the controller See "
Sensor Calibration " on page 41. The selected program, connected
sensors and the specific model design determine which measurement
values are displayed.
2. Statistics
Serve for function control and long-term monitoring of the system.
For time-dependent functions such as circulation and anti-legionella
and the evaluation of system data, it is essential that the time is accur-
ately set on the controller. Please note that the clock continues to run
for about 24 hours if the mains voltage is interrupted, and afterward
must be reset. Improper operation or an incorrect time may result in
data being cleared, recorded incorrectly or overwritten. The man-
ufacturer accepts no liability for the recorded data!
Operating hours
Display of the operating hours of the consumers connected to the controller (for example, solar pumps, valves etc.) whereby different time
ranges (day-years) are available!
Heat quantity
Display of the consumed heat quantity form the system in kWh.
This is an indicative value.
Graphic overview
This results in a clear illustration of the data as a bar graph. Different time ranges are available for comparison. You can page through with
the two left keys.
Message Log
Display of the last 20 errors in the system with indication of date and time.
Reset / Clear
Resetting and clearing the selected statistics. Selecting ‚all statistics‘ clears everything except the messages.
3. Operating Mode
Auto
The automatic mode is the normal mode of the controller. A correct controller function under consideration of the current temperatures and
the set parameters is only present in automatic mode! After an interruption of the mains voltage, the controller automatically returns to the last
operating mode selected.
Manual
The individual relay outputs, v outputs and the connected consumers can be checked for proper functioning and correct assignment.
The operating mode ‚Manual‘ may only be used by specialists for brief function tests, e.g. during commissioning! Function in
manual mode: The relays and thus the connected consumers are switched on and off by pressing a key, with no regard to the cur-
rent temperatures and set parameters. At the same time, the current measurement values of temperature sensors are also shown
in the display for the purposes of function control.
Aus
If the operating mode “off” is enabled, all control functions are turned off. The measured temperatures are displayed for the over-
view.
4. Settings
By no means does the controller replace the safety appliances on site!
Tmin S1
Enable/start temperature at sensor 1:
If this value on the sensor 1 (collector sensor) is exceeded and the other conditions are not fulfilled, the controller will turn on the affiliated
pump or the valve. If the temperature on the sensor 1 falls 5 °C below this value, the pump or the valve will be turned off again.
Priority Storage X
Priority of storages in a multiple storage system. This determines the order, in which the storages are charged. If the same priority is set for 2
storages, the charging is not switched over until charging the active storage is not possible anymore.
Example: if several storages or storage areas in your system are integrated, you can specify a priority for each sensor of the storage or the
storage area. The "X" in the menu item priority S(X) indicates the sensor of the respective storage or storage area.
The priority for the first storage is thus set under priority S2 and for the 2. storage under priority S3.
ΔT Solar S(X)
Switch-on/switch-off temperature difference for sensor X: If the temperature difference ΔT solar between the reference sensors is
exceeded and the other conditions are fulfilled, the controller will turn on the pump/valve on the corresponding relay. If the temperature dif-
ference falls to ΔT Off, the pump/valve will be turned off again.
If the set temperature difference is too small, this may lead to ineffective operation depending on the system and sensor pos-
itioning. For speed regulation (See " Speed control " on page 33), special switch conditions apply!
Example: if several storages or storage areas in your system are integrated, you can specify ΔT for each sensor of the storage or the stor-
age area. The "X" in the menu item ΔT solar S(X) indicates the sensor of the respective storage or storage area. ΔT solar for the first stor-
age is thus set under ΔT solar S2 and for the 2. storage under ΔT solar S3.
Tmin S2
Switch off temperature at sensor 2:
If this value is exceeded on the sensor 2, the controller turn off the affiliated pump or the valve. If this value on the sensor 2 is undershot and
the other conditions are fulfilled, the controller will turn on the pump or the valve.
Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be provided
by the customer!
In multiple storage systems, if the shut-down temperature S2 is exceeded, a downstream installed storage or storage area is switched to.
Tmin Storage X
Switch-off temperature at sensor X at multiple storage systems
If this value is exceeded at sensor X then the controller switches the associated pump and/or valve off. If sensor (X) falls below this value
again and the other conditions are also met, then the controller switches the pump and/or valve on again.
Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be provided
by the customer!
In multiple storage systems, if the shut-down temperature S(X) is exceeded, a downstream installed storage or storage area is switched to.
Example: if several storages or storage areas in your system are integrated, you can specify a priority for each sensor of the storage or the
storage area. The "X" in the menu item priority S(X) indicates the sensor of the respective storage or storage area.
The priority for the first storage is thus set under priority S2 and for the 2. storage under priority S3.
Priority temperature
Temperature threshold for absolute priority charge. In systems with two storage tanks charging of the lower-priority storage tank will never
take place until this temperature at sensor of the higher-priority storage tank is exceeded.
Loading time
Interruption of charging into the lower priority storage. The charging of the lower-priority storage is interrupted after the settable time in
order to check whether the collector has reached a temperature level that allows charging in the higher- priority storage. If so, the priority
storage tank is charged. If not, the increase is measured (See " Increase " on page 31), to check if charging of the priority storage will be
possible shortly.
Increase
Extension of the charging pause due to temperature increase. For precise setting of the charging priorities for systems with multiple stor-
age tanks, the necessary temperature increase of the collector at which the interruption of the charging into the lower-priority storage tank
is extended by one minute is set here. The interruption is extended because the temperature increase of the collector is expected to enable
charging in the higher-priority storage tank soon. As soon as ΔT conditions are met, the priority storage tank is charged.
If the rise in temperature falls below the set value, then the charging of the lower-priority storage tank is enabled again.
5. Protective Functions
The 'Protective functions‘ can be used by specialists to activate and set various pro-
tective functions.
By no means does the controller replace the safety appliances on site!
System protection
Priority protection function
The system protection should prevent an overheating of the components installed in the system through the forced shut down of the solar cir-
culation pump. If the value “AS Ton” on the collector has been exceeded for 1 Min. the pump will be turned off and not turn on again in order to
protect the collector, for example, from steam. The pump will only be switched on again, when the collector temperature falls below “SP Toff”.
With the system protection (on), there are increased standstill temperatures in the solar collector and therefore an increased pres-
sure in the system. The operating manuals from the system components must be observed.
Collector protection
Priority protection function
The collector protection prevents the collector from overheating. A forced switching of the pump makes sure that the collector is cooled
through the storage. If the value “KS Ton” is exceeded on the collector, the pump will be turned on in order to cool the collector. The pump is
shut down if the value “KS Toff” on the collector is not met or the value “KS Tmax Sp.” on the storage is exceeded.
System protection has priority over collector protection! Even if the switch requirements for the collector protection are present,
the solar circulation pump is turned off once “AS T on” is reached. Normally the values from the system protection (depending on
the maximum temperature of the storage or other components) are higher than the collector protection.
Recooling
In the system hydraulics with solar, excess energy is guided from the storage back to the collector with an activated return cooling function.
This only occurs if the temperature in the storage is greater than the value “Return cooling Tref” and the collector is at least 20 °C colder than
the storage and until the storage temperature has fallen below the value “Return cooling Tref”. For muti-storage systems, the return cooling
applies to all storage.
Energy is lost through the collector through this function! The recooling should only be activated in cases of exception, with low
heat acceptance, for example, during vacation.
Frost Protection
A 2-level frost protection function can be activated. In level 1, the controller turns on the pump every hour for 1 minute if the collector tem-
perature is below the set value “Frost Level 1”. If the collector temperature continues to decrease to the set value “Frost Level 2”, the con-
troller will turn on the pump without disruption. If the collector temperature exceeds the value “Frost level 2” by 2 °C, the pump will turn off
again.
Energy is lost through the collector through this function! It is normally not activated for solar systems with antifreeze. The oper-
ating manuals from the other system components must be observed.
Seizing Protection
If the anti-seizing protection is activated, the controller switches the heat pump and the mixer on/off at 12:00 noon or weekly on Sundays at
12:00 for 5 seconds to prevent seizing of the pump/valve after long periods of inactivity.
Collector alarm
If this temperature at the collector sensor is exceeded when the solar pump is turned on, a warning or error notification is triggered. There is
a corresponding warning in the display.
Pressure Monitoring
In this menu, the system pressure monitoring can be activated through a direct sensor. Once the set pressure conditions are exceeded, a
message is generated and the LED flashes red.
6. Special Functions
Used to set basic items and expanded functions.
The settings in this menu should only be changed by a specialist.
Program selection
Here the hydraulic variation fitting to the respective use case is selected and set.
The program selection normally occurs only once during the first entry into service by a specialist. An incorrect program selec-
tion may lead to unpredictable errors.
Pump settings
Settings from the 0-10V or the PWM pump can be made in this menu.
When this menu is selected, you may receive a request to save the speed settings.
Signal type
Only available, if the function is used on one of the V-outputs. The type of device to be controlled is set here.
0-10V: Controlled by a 0-10V signal.
PWM: Control by means of a PWM signal.
Profile
In this menu, the preset profiles for actuators can be selected or under “manual” all settings can be done personally. The settings can still
be changed after a profile has been selected.
Speed control
If the speed control is activated, it LTDC offers the possibility through a special internal electronic system to change the speed of pumps
depending on the process. The relay R1, R2 and the Pwm and 0-10V outputs can work with the speed controlled.
This function should only be activated by a technician. Depending on the pump being used and the pump level, the minimum
speed may not be set too small, because the pump or the system may be damaged. The specifications from the affected man-
ufacturer must be observed for this! When in doubt, the min. speed and the pump level should be set too high instead of too low.
Variant
The following speed variants are available here:
Off: There is no speed regulation. The connected pump is only turned on or off with full speed.
Mode M1: The controller changes to the set max. speed after the purging time. If the temperature difference ∆T between the reference
sensors is below the set switch on temperature difference ∆T R1, the speed will be reduced. If the temperature difference between the ref-
erence sensors is above the set switch on temperature difference ∆T R1, the speed will be increased. If the controller has decreased the
speed of the pump to the smallest level and the ∆T between the reference sensors is still only ∆Toff, the pump will be turned off.
Mode M2: The controller changes to the set min. speed after the Speed. If the temperature difference ∆T between the reference sensors is
above the set switch on temperature difference ∆T R1, the speed will be increased. If the temperature difference ∆T between the reference
sensors is below the set switch on temperature difference ∆T R1, the speed will be reduced. If the controller has decreased the speed of the
pump to the smallest level and the ∆T between the reference sensors is still only ∆Toff, the pump will be turned off.
Mode M3: The controller changes to the set min. speed after the Speed. If the temperature on the reference sensors is above the set value to
be set in the following, the speed will be increased. If the temperature on the reference sensors is below the set value to be set in the fol-
lowing, the speed will be reduced.
Mode M4 (2 storage system):
When the primary storage is loaded, speed control works as in M3. When the secondary storage is loaded, speed control works as in M1.
Purging time
For this time, the pump runs with its full speed (100%) in order to guarantee a secure start-up. Only after expiration of this purging time will the
pump have a controlled speed and will switch, depending on the set variant, to the max. or min. speed. Speed.
Sweep time
With the control time, the inertia of the speed control is determined in order to prevent strong temperature deviations as much as possible.
The timespan is entered here, which is needed for a complete cycle from minimum speed to maximum speed.
Max. Speed
The maximum speed of the pump is determined here in %. During the setting, the pump runs in the respective speed and the flow can be
determined.
The specified percentages are variables, which may deviate more or less strongly depending on the system, pump and pump
level. 100% is the maximum possible power of the controller.
Min. Speed
The minimum speed of the pump is determined here. During the setting, the pump runs in the respective speed and the flow can be determ-
ined.
The specified percentages are variables, which may deviate more or less strongly depending on the system, pump and pump
level. 100% is the maximum possible power of the controller.
Setpoint
This value is the control setpoint for mode 3 See " Variant " on page 33, only version 2.3, and 4.. If this value is below at the sensor, the speed
is reduced. When it is exceeded, the speed is increased.
Relay functions
Free, i.e. in the specific hydraulic variant unused relays, can be assigned to various additional functions. Every additional function can only be
assigned once.
R1 to R2: mechanical relay 230V
R3: Alternating contact 230 V
V1 and V2: PWM and 0-10 V outputs See " External relay at signal output V(X) (0-10V / PWM) " on page 46
Please pay special attention to the relay’s technical information (see "Specifications“).
The symbols shown here are displayed on the main overview screen when the special function is activated.
The sequence in this list does not correspond to the menu numbering in the controller.
Solar bypass
Use a relay to switch a bypass valve or a bypass pump. With this function, the flow can be guided past the storage if the flow temperature at
the bypass sensor is less than in the storage to be filled.
Solar bypass
Variant
In this menu, you can set if the flow is guided through the bypass with a pump or a valve.
Bypass sensor
The reference sensor for the bypass function to be placed in the flow is selected in this menu.
Thermostat
Through the thermostat function, additional energy can be added to the system while being time and temperature controlled. The ther-
mostat function can be used in 2 modes.
"On" = the relay is switched on when all switching conditions are reached
"Inverted" = the relay is switched off when all switching conditions are reached and is otherwise switched on.
Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be provided
by the customer!
Other values, for example, Teco, apply in economy mode.
Thermostat
Tset
The target temperature of the thermostat sensor 1. Below this temperature, the eat turns on until Tset+ Hysteresis is reached.
Hysteresis
Hysteresis of set-point temperature.
Thermostat sensor 1
TH Set is measured at thermostat sensor 1. With a connected thermostat sensor 2, the relay switches on if “TH Ref” at thermostat sensor 1
is undershot and off if “TH Ref” + hysteresis is exceeded at thermostat sensor 2.
Thermostat sensor 2
Optional switch off sensor
If “TH target” + hysteresis is exceeded on thermostat sensor 2, the relay will be shut down.
Teco
T Set for energy saving mode
If the energy saving mode (See " Energy Saving Mode " on page 35) is on: During a solar charge, instead of “TH reference”, this set value
“Teco” will be used as the reference value. When the temperature drops below Teco at thermostat sensor 1, the relay is switched on and
heats up to “T eco” + hysteresis.
Energy Saving Mode
The Energy Saving Mode switches the heating on when “T Eco on” is undershot and heats up to “T Eco” + hysteresis when solar charge or
solid fuel boiler is active.
Thermostat enable
Thermostat activity times
Here the desired periods are set in which the thermostat function is approved. For each weekday, three times can be specified, furthermore,
you can copy individual day to other days. The thermostat function is shut down outside of the set times.
Cooling
This function is used e.g. to cool down storages to a setpoint temperature in which heat is dissipated.
Tset
The target temperature of the thermostat sensor 1. Above this temperature, the cooling is activated until Tset + hysteresis is achieved.
Hysteresis
When the temperature at the cooling sensor Tset + Hys, the relay is switched off.
Cooling sensor
Reference sensor of the cooling function.
Release times
Cooling release times
Here the desired periods are set in which the cooling function is approved. For each weekday, three times can be specified, furthermore, you
can copy individual day to other days. The cooling function is shut down outside of the set times.
Return flow increase
With this function, for example, the return temperature of a heating circuit is increased through the storage.
Return flow increase
Activate function.
Return flow increase Tmax
Maximum temperature set on the storage sensor set for this function If this temperature is exceeded at the RL storage sensor, the function is
deactivated again.
∆T Return flow
Switch on temperature difference:
The relay is turned on if this temperature difference is exceeded between the storage sensor and the recooling sensor.
Switch off temperature difference:
The relay is turned off if this temperature difference is undershot between the storage sensor and the recooling sensor.
Return flow sensor
Selection of the return flow sensor.
Storage sensor
Selection of the storage sensor.
Field cooling
This function controls an external cooling unit to cool down the collector.
Field cooling sensor
Reference sensor of the field cooling function.
This function does not activate the solar pump to cool the collector via the storage. Therefore, please activate the collector pro-
tection in the protection functions.
Hys max
To protect the cooling unit itself from damage, the relay is switched off as soon as the temperature at the reference sensor of the field cool-
ing reaches Tmax field + Hys max.
Hys min
When the temperature at the reference sensor of the field cooling falls below Tmax field +Hys min, the relay is switched off.
Tmax field
If this temperature is exceeded at the reference sensor of the field cooling, the relay is switched on.
Anti-Legionella
The anti-legionella function is an additional function for certain relay functions such as: electric heating rod, burner, circulation,
compressor.
With the help of the anti legionella function (hereinafter referred to as: AL), the system can be heated up at selected times in order to free it
of legionella.
In the delivery state, the anti legionella function is switched off.
Antilegionella function is not shown in the menu “Protective functions”. It is instead shown as submenu of the corresponding
special function. Special functions with AL include: Solar, burner, circulation and compressor.
As soon as it has heated up with “AL” turned on, information with the date will be shown in the display.
This anti legionella function does not offer any secure protection against legionella, because the controller requires an
adequate added amount of energy and the temperatures cannot be monitored in the entire storage area and the connected
pipe system.
During the operation of the anti legionella function, if applicable, the storage is heated above the set value “Tmax”, which may
lead to scalding and system damage.
AL Tset
For a successful heating, this temperature has to be reached at the AL sensor(s) for the exposure time period.
AL residence time
For this period of time the AL Tsettemperatures at the activated AL-sensors have to be reached for a successful heating.
Last AL heat
This displays when the last successful heating has occurred.
AL sensor 1
On this sensor, the temperature of the AL function is measured.
AL Sensor 2
Optional AL sensor
If this sensor is set for a successful heating Tset AL have to be achieved at this sensor too for the action time.
AL-times
During this periods the AL heat up is attempted. If within the defined period, the AL-condition is met (Tset at the defined sensors for the
exposure time period), the heating is completed and logged as "Last AL heating".
Heat transfer
With this function, energy from one storage can be loaded in another.
Heat transfer
Δ T Heat transfer
Temperature difference for the transfer. If the temperature difference between the sensors ∆T transfer On is reached, the relay is switched
on. As soon as the difference on ∆T Transfer off falls, the relay is turned off again.
Heat Transfer Tmax
Target temperature of the target storage
If this temperature is measured on the sensor in the target storage, the Heat Transfer will be shut down.
Heat Transfer Tmin
Minimum temperature in the source storage for the approval of the Heat Transfer.
Source
In this menu, the sensor is set, which is placed in the storage from which the energy is extracted.
Drain
In this menu, the sensor is set that is placed in the storage in which it is loaded.
Difference
The assigned relay is activated as soon as there is a preset temperature difference (ΔT on/off) between the source and target sensors.
Difference
Δ T Difference
Switch on - difference:
If this temperature difference is reached, the relay will switch on.
Switch off - difference:
If this temperature difference is reached, the relay will switch off.
DF-Source
Heat source sensor/heat supplier for differential function
Adjusts the sensor from the heat source.
Tmin Source
Minimum temperature on the source sensor for approval of the difference relay.
If the temperature on the source sensor is below this value, the difference function will not be switched on.
DF-Drain
Heat decreasing sensor / heat customer for the different functions
Sets the sensor of the heat customer.
Tmax Drain
Maximum temperature on the target sensor for approval of the difference relay.
If the temperature at the target sensor exceeds this value, the difference function will not be turned on.
Solid fuel boiler
In solid-fuel boiler function, a pump is controlled with a assigned relay, which loads the heat energy from a solid-fuel boiler into a storage tank.
The solid-fuel boiler function controls the charge pump of a solid-fuel boiler based on the temperature difference between the solid-fuel boiler
sensor and the storage tank sensor.
If a control output (V1 or V2, ...) is used with this function, a speed control with a PWM / 0-10V HE pump is possible.
Solid fuel boiler Tmin
Minimum temperature in the solid fuel boiler to start the pump.
If the temperature at the solid fuel boiler sensor exceeds the temperature set here, the relay switches on the pump, if the other starting con-
ditions are met.
Below the solids boiler Tmin temperature, the solids boiler function is deactivated.
ΔT Solid fuel boiler
Switch-on and switch-off difference between solid fuel boiler (FFS) and storage tank.
If the temperature difference between the sensors defined for this function exceeds the value set here (ΔT FS On), the function switches
on the assigned output (relay or signal output).
If the set temperature difference (ΔT FS Off) between the solids boiler and the storage tank is below, the function switches off the assigned
output (relay or signal output).
Solid fuel boiler Tmax
Maximum temperature in storage tank. If this is exceeded, the relay is switched off.
Boiler sensor of this function
Sensor used as a solids boiler sensor. Considered for SF Tmin and ΔTon/off.
Storage sensor
Sensor used as a storage tank sensor. Considered for FS Tmax and ΔTon/off.
Error Messages
The relay is switched on if one or several of the set protective functions are activated. This function can be inverted so that the relay is
turned on (Duration on) and then turned off again if a protective function is activated.
Error message
Activate or deactivate function.
The additional function error message activates the relay for certain events and only deactivates again when the information message to
each event was read.
Pressure monitor
In this menu, the system pressure monitoring can be activated through a direct sensor. As soon as the set pressure conditions are under-
shot or exceeded, the set relay will switch on.
Pressure monitor
Relay turns on if the pressure goes below the minimum or exceeds the maximum.
RPS-Type
Type of pressure sensor
In this menu, you can adjust which pressure sensor is being used. Please note: If e.g. VFS1 is connected, RPS1 option is not shown.
RPS Min
Minimum pressure. If this pressure is not met, the controller emits an error notification and the relay switches.
RPS Max
Maximum pressure in the system. If this pressure is exceeded, the controller emits an error notification and the relay switches.
Booster Pump
An additional booster pump can be activated with this function if the primary pump is no longer sufficient.
Booster Pump
Activate function.
Charge time
When solar charging begins, the connected booster pump fills the system for the time set here.
Parallel operation R1/R2
The relay is switched on at the same time as the set relay R1 or R2.
Parallel operation
Here you can additionally set the switch mode.
On : The function switches parallel to the set signal output.
Inverted : The function switches contrary to the set signal output.
Delay
In this menu, it is set how long to wait after switching the signal output until the parallel operated relay switches as well.
Follow-up time
In this menu, it is set how long the parallel-operated relay continues to operate after the set signal output has been deactivated.
Always on
Relay is permanently switched on.
Heating circuit
A heating circuit pump with fixed hysteresis (+/- 1 °) controlled to achieve the target value. A delay of 30 seconds of activation/ deactivation is
fixed to prevent shocks. The RC21 room controller can be used as room sensor.
Room sensor
Select the reference sensor for the room temperature.
Room Reference (Night)
Set room temperature for the night-time mode If the temperature is exceeded at the room sensor outside the set times, the relay will turn off.
Room Reference (Day)
Set room temperature for the daytime mode If the temperature is exceeded at the room sensor at the set times, the relay will turn off.
Release Times
Thermostat activity times
Set the desired periods of time when the thermostat should be active. For each weekday, three times can be specified, furthermore, you can
copy individual day to other days. Outside the set times the thermostat is switched off.
Heat quantity
Constant flow
If “Constant flow” is activated as the type of heat quantity metering, the approximate heat from the manually entered values for antifreeze, its
concentration and the flow from the system and the measured sensor values from the collector and storage are calculated. Additional inform-
ation about antifreeze, its concentration and the flow of the system is required. Additionally through the setting offset ∆T, a correction factor
can be set for the heat quantity collection. Since the collector temperature and the storage temperature can be used for the heat quantity
metering, depending on the system, there may be deviations from the displayed collected temperature to the actual previous temperature or
the displayed storage temperature to the actual return temperature. Through the setting Offset ∆T, this deviation can be corrected.
Example: displayed collector temperature 40°C, read previous temperature 39°C, displayed storage temperature 30°C, read return tem-
perature 31° means a setting of -20% (displayed ∆T 10K, actual ∆T 8K => -20% correction value)
The heat quantity data in the “Constant flow” mode only consists of calculated values for the functional inspection of the system.
Flow temperature sensor (X)
In this menu, it is set which sensor is used to measure the flow temperature.
Return flow sensor
In this menu, you can set which sensor is used to measure the return flow temperature.
Glycol type
In this menu, the antifreeze used is set. If none is used, please set glycol proportion to 0.
Glycol percentage
The percentage of antifreeze in the medium.
Flow rate supply flow (X)
Nominal system flow.
The flow of the system in liters per minute, which is used as calculation basis for heat metering.
Offset ∆T
Correction factor for the temperature difference for heat metering
Since the collector temperature and the storage temperature can be used for the heat quantity metering, depending on the system, there
may be deviations from the displayed collected temperature to the actual previous temperature or the displayed storage temperature to the
actual return temperature. This deviation can be corrected with the adjustment value Offset ΔT
Example: displayed collector temperature 40°C, read previous temperature 39°C, displayed storage temperature 30°C, read return tem-
perature 31° means a setting of -20% (displayed ∆T 10K, actual ∆T 8K => -20% correction value)
VFS (X)
The type used of direct sensor is set in this menu.
VFS - Position
This menu is used to set whether the direct sensor was mounted in supply or return flow.
To prevent damage to the Vortex Flow sensor it is highly recommended to place it in the return flow. If contrary to this recom-
mendation it is used in the supply line, the maximum temperature has to be considered. (0 ° C to 100 ° C continuous operation
and short term -25 ° C to 120 ° C)
Reference sensor
The sensor to be used for heat metering is set here.
Sensor Calibration
Deviations in the temperature values displayed, for example. due to cables which are too long or sensors which are not positioned optim-
ally can be compensated for manually here. The settings can be made for each individual sensor in steps of 0.5 °C.
Settings are only necessary in special cases at the time of initial commissioning by the specialist. Incorrect measurement val-
ues can lead to unpredictable errors.
Commissioning
Starting commissioning help guides you in the correct order through the basic settings necessary for commissioning, and provides brief
descriptions of each parameter in the display. Pressing the ‚esc‘ key takes you back to the previous value so you can look at the selected
setting again or adjust it if desired. Pressing ‚esc‘ more than once takes you back to the selection mode, thus cancelling the commissioning
help (See " Commissioning help " on page 28).
May only be started by a specialist during commissioning! Observe the explanations for the individual parameters in these
instructions, and check whether further settings are necessary for your application.
Factory settings
All settings can be reset, returning the controller to its delivery state.
All of the controller‘s parametrization, statistics, etc. will be lost irrevocably. The controller must then be commissioned once
again.
Time & Date
Serve to set the current time and date.
For time-dependent functions such as circulation and anti-legionella and the evaluation of system data, it is essential that the
time is accurately set on the controller. Please note that the clock continues to run for about 24 hours if the mains voltage is inter-
rupted, and afterward must be reset. Improper operation or an incorrect time may result in data being cleared, recorded incor-
rectly or overwritten. The manufacturer accepts no liability for the recorded data!
Starting aid
For some solar systems, in particular for vacuum tube collectors, the measurement recording on the collector sensors may be too slow or
imprecise, because the sensor is often not on the warmest spot. With an activated starting aid, the following procedure occurs: If the tem-
perature on the collector sensor increases within a minute by the value defined under “increase”, the solar circulation pump will be turned on
for the set “purging time” so that the medium to be measured is transported to the collector sensor. If there is still no normal switching con-
dition through this, there will be a 5 minute block time for the start wizard function.
This function should only be activated by a technician if problems occur with the measurement recording. Observe in particular
the instructions from the collector manufacturer.
The menus "Purging time" and "Increase" are only displayed when the starting aid function is set to "On".
Purging time
If the temperature on the collector sensor increases within a minute by the value defined under “increase”, the solar circulation pump will be
turned on for the set “purging time” so that the medium to be measured is transported to the collector sensor. If the set ΔT is not reached, a 5-
minute circulation pause time for the starting aid function will apply.
Increase
If the temperature at the collector reaches within a minute the value defined, the solar pump is turned on for the duration of the purging time.
Global radiation sensor
With the global radiation sensor, a start-up operation can be triggered depending on the solar
radiation. If the set radiation intensity exceeded at the sensor, the start-up aid is activated and the solar pump is switched on for the set rins-
ing time. If within this time no start condition is reached, the start-up function is blocked for the set time.
Radiation sensor
The sensor input can be defined here, to which the global radiation sensor is connected.
Radiation intensity
If the radiation intensity set here is exceeded in watts See " Starting aid " on page 42per at the radiation sensor, the starting aid function
will be triggered,
Blocking time
Here a blocking time in minutes can be defined. Within this the starting aid function is disabled.
Daylight saving time
If this function is activated, the controller automatically changes to winter time or summer time (DST, Daylight Savings Time).
Eco Display Mode
In Eco Display Mode the backlight of the display is switched off if no buttons are pushed for 2 minutes.
If a message exists, the backlight does not switch off until the message has been scanned by the user.
Temperature unit
In this menu you can select between the temperature units °C and °F.
Network
If necessary, the network settings of the connected data logger must be set.
Access Control
This menu lets you give up to 4 users access to the data logger. The users that are registered then have access to the controller or respect-
ively the data logger.
To add a user in the list, select <add user>. Leave the now visible menu open und connect to the address of the connector or respectively
the data logger. Your user name is going to appear in this menu and can be selected and confirmed with ‘OK’.
Note
You can find the address of the connector or respectively the data logger on the address sticker on the outside of the casing. Pointers and
help on how to establish a connection you can find in the enclosed SOREL Connect instructions or the instructions of the data logger.
Select a user with ‘OK’ to grant access.
To revoke access again, choose one of the users from your list and choose <remove user>.
Ethernet
The data logger‘s Ethernet connection settings can be set using this menu.
MAC Address
Displays the individual MAC address of the data logger.
Auto-Configuration (DHCP)
If auto-configuration is activated, the data logger requests IP addresses and network parameters from a DHCP server that assigns an IP
address, subnet mask, gateway IP and DNS server IP. If you deactivate the auto configuration (DHCP), you will have to make the
required network settings manually!
IP-Address
Please refer to the router configuration for the IP address to be set.
Subnet Mask
Please refer to the router configuration for the subnetz mask to be set.
Gateway
Please refer to the router configuration for the gateway to be set.
DNS-Server
Please refer to the router configuration for the DNS server to be set.
CAN bus ID
Here you can see the ID of the controller on the CAN bus.
Sensor send interval
The send interval determines how often the sensor and output values of the controller may be send via CAN. If a value changes, it is sent
and starts the interval. The next values are not sent until the interval has expired. If no value changes, nothing is sent.
If there are several controllers in the CAN network, a too short send interval can lead to an overload of the CAN network.
7. Menu Lock
Secure the controller against unintentional changing and compromise of basic func-
tions.
Menu lock active = "On"
Menu lock off = "Off"
In addition, the "Simple" menu view can be used to hide menu items that are not neces-
sary for the daily use of the controller after commissioning. The menu item "Menu lock
on/off" is also hidden when the "Simple" menu view is selected!
The menus listed below remain completely accessible despite the menu lock being
activated, and can be used to make adjustments if necessary:
Measurement values
Statistic
Settings
Special Functions
Menu Lock
Language
8. Service Values
Serve for remote diagnosis by a specialist or the manufacturer in the event of errors,
etc.
Enter the values into the table when an error occurs.
9. Language
To select the menu language. During initial commissioning and longer power inter-
ruptions, the query is made automatically. The choice of languages may differ depend-
ing on the model. Language selection is not available for every model.
Malfunctions/Maintenance
Replacing the Fuse
Repairs and maintenance may only be performed by a specialist. Before working on the unit, switch off the power supply and
secure it against being switched on again! Check that there is no power flowing!
Only use the supplied spare fuse or a fuse of the same design with the following specifications: 2 AT/250 V.
If the mains voltage is switched on and the controller still does not function or display anything,
then the internal device fuse may be defective. First find the external fault source (e.g. pump),
replace it and then check the device fuse.
To replace the device fuse, open the device as described under "See " wall Installation " on page
25", remove the old fuse, check it and replace if necessary.
Then first recommission the controller and check the function of the switch outputs in manual mode
as described in Section 3.2.. .
Maintenance
In the course of the general annual maintenance of your heating system, the functions of the controller should also checked by
a specialist and the settings should be optimized if necessary.
Performing maintenance:
lCheck the date and time See " Time & Date " on page 42
lAssess/check plausibility of statistics See " Statistics " on page 29
lCheck the error memory See " Message Log " on page 29
lVerify/check plausibility of the current measurement values See " Measurement values " on page 28
lCheck the switch outputs/consumers in manual mode See " Manual " on page 30
lPossible optimization of the parameters setting (only on customers request)
Possible error messages
Possible error messages Notes for the specialist
No flow If ΔT between store and collector is 50 ° C or more for 5 minutes, this message is displayed.
Frequent on / off A relay was switched on and off more than 5 times within 5 minutes.
AL failed Anti-legionella failed appears if at least anti-legionella Tsoll -5 °C could not be held at the anti-legion-
ella sensor for the set exposure time.
System protection The collector temperature has exceeded the set temperature and the solar pump has been turned
off, so that the system does not overheat.
Collector protection The collector temperature has exceeded the set temperature and the solar pump has been turned
on, in order to cool the collector via the storage.
Recooling The exceeding energy is/was transmitted via the collector to protect the system.
Frost Protection The solar pump is switched on in order to protect the collector from freezing.
Low system pressure It is displayed when Pmax pressure monitoring is active and Pmax is exceeded.
Additional Information
External relay at signal output V(X) (0-10V / PWM)
1. Connect external 0-10V relay to signal output, e.g. V1.
CAN bus
1. The CAN devices are connected in series with the CAN bus cable.
2. The first and last CAN device in this connection in series must be fitted with terminating
resistance.
The wiring of the two CAN sockets is arbitrary.
Drain Back
For drain fack system, the following parameters must be adjusted as follows:
4.5. DeltaT Solar S2 10°C/4°C
4.8. DeltaT Solar S3 10°C/4°C
5.1. System protection on
5.1.2. SP T on 100°C/95°C
6.3.2. Purging time 300s
6.3.5. Minimum speed 60%
Appendix
Signal
In this menu, the preset profiles for the signal can be selected or under “manual” all settings can be done personally. The settings can still
be changed after a profile has been selected.
Profile
Delete this text and replace it with your own.
Output Signal
In this menu the type of actors are set: heating pumps have the greatest output with a small input signal, solar pumps in contrast have very
little output with a small input signal. Solar = normal, heating = inverted. For 0-10 V pump always choose the "Normal" setting
PWM / 0-10V off
This voltage / this signal is emitted if the actor is turned off (actor with cable break detection require a minimum voltage / a minimum signal).
PWM / 0-10V on
This voltage / signal is required the actuator to switch on and run at minimum speed.
PWM / 0-10V max.
With this value, the maximum voltage level / maximum signal can be specified for the highest speed of the actuator, which is used, for
example, during the purging or manual operation.
Speed when „On“
In this menu, the calculation basis of the displayed speed is changed. If, for example, 30% is specified here, the signal/voltage set under
“PWM On” / “0-10V On” will be displayed during creation so that a 30% speed is present. When creating the signal/voltage of PWM Max / 0-
10V Max, 100% speed is displayed. Temporary values are calculated correspondingly.
This function does not influence the rule, but rather only the display on the status screen.
Example for signal settings
Technical data PWM and 0-10V
Show signal
Represents the set signal in a graphic and text overview.
Tips
The service values include not only current measurement values and operating states, but also all of the settings for the controller.
Write the service values down just once after commissioning has been successfully completed.
In the event of uncertainty as to the control response or malfunctions the service values are a proven and successful method for
remote diagnosis. Write the service values down at the time that the suspected malfunction occurs. Send the service value table by
fax or e-mail with a brief description of the error to the specialist or manufacturer.
To protect against loss of data, record any statistics and data of particular importance at regular intervals.
In the programs with pool included, the charging of the pool, for example, for winter operation, can be turned off using a simple func-
tion. To do this, simply press and hold the "esc" key on the diagram / overview mode for several seconds. A message is displayed
on the screen when the pool is turned off or on again.
Instead of setting the flow from the system with a volume flow limiter, the flow can be adjusted better through the stage switch on
the pump and through the setting “max. speed” on the controller (See " Max. Speed " on page 34). This saves electrical energy!
Final Declaration
Although these instructions have been created with the greatest possible care, the possibility of incorrect or incomplete information cannot be excluded. Sub-
ject as a basic principle to errors and technical changes.
Date and time of installation:
Name of installation company:
Space for notes:
Your specialist dealer: Manufacturer:
SOREL GmbH Mikroelektronik
Reme-Str. 12
D - 58300 Wetter (Ruhr)
+49 (0)2335 682 77 0
+49 (0)2335 682 77 10
info@sorel.de
www.sorel.de
Version: 22.12.2021
SOREL
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