Traditional ON/OFF room thermostats control room temperature by switching
the circulating pump, and usually the boiler, on and off.
Because of the thermal inertia of the heating equipment and the relatively
large switching differentiials of on/off devices large space temperature
variations often occur, resulting in poor comfort conditions.
Chrono-proportional Control as implemented in the TP75-RF overcomes the
problem by ensuring that the boiler fires regularly for periods calculated to
maintain radiator temperature without overheating and to prevent the radiator
temperature falling to a level which can allow down draughts from cold
surfaces, e.g. windows, to cause discomfort.
The control logic works on a proportional band of 4°F which assumes that the
boiler will operate at full load when the sensed space temperature is 4°F or
more lower than the programmed set point.
The following graph shows the relative on/off periods per cycle against
variances in deviation from the set point.
TP75
TP75
Control Features
The TP75-RF is a wireless communication version of the standard hardwired
TP75 programmable thermostat. The TP75-RF, which contains a transmitter,
works in conjunction with an RX receiver module which can be located up to
30m from the thermostat.
The TP75-RF Series of programmable room thermostats incorporate two
special features that can be enabled at the time of installation - Optimum
Start Control and Chrono-proportional Control.
Optimum Start Control (OSC)
With this enabled the event 1 control temperature, (which would normally be
an increase from an overnight set-back temperature), may be programmed
to be achieved by a desired time. The heating plant will be switched on earlier
than the programmed time by a period related to the start-up curve selected
and the space temperature sensed at the beginning of the selected start-up
period. The diagram below indicates the switch on periods for the available
start-up curves.
If OSC is disabled then the unit will operate as a conventional room
thermostat, switching on the heating plant at the event 1 time with the event
1 temperature being achieved in a time related to the prevailing conditions.
Installation & Commissioning Guide
Battery Compartment Flap lowered
Specification
Control temp. range:41°F to 85°F (5°C to 30°C)
Power Supply:2 x AA size alkaline batteries
Transmission Frequency:433.92 MHz
Range:30m typical
Time Keeping Accuracy:± 1 minute/month
Low Battery Warning:15 days duration
Memory Retention with
Batteries Removed:one minute
Enclosure Rating:IP30
Maximum Ambient Temp:113°F
Designed to British Standard:BS EN60730-2-9
Overall DimensionsUnit:Width:136mm
Height:88mm
Depth:32mm
Emission Designator:2K02D
FCC Identifier:P07 TP75RF
FCC Rules:15°C
Programmable Room Thermostat
with Wireless Communication
TP75-RF with integral sensor
90
min30
min
60
min
Selecting 0
effectively
disables
the OSC
function.
Desired Event 1
temperature
Degrees below the desired temperature at
the beginning of the Optimum Start Period
-3.6°F
(-2°C)
120
min
-1.8°F
(-1°C)
-5.4°F
(-3°C)
-7.2°F
(-4°C)Event 1
time(0)
Available Start-up Periods
With a -3.6°F (-2°C) deviation and the 30 min. curve selected the
heating system will switch on 15 min. before the Event 1 time.
2
Switch No. 1- 5/2 DAY or 7 DAY.
When the switch is in the 7 DAY position each day may be programmed
with different switching times and temperatures. Placing the switch in
the 5/2 DAY position enables Monday to Friday to be programmed with
one set of switching times and temperatures, and Saturday and
Sunday to be programmed with a different set.
Switch No. 2 - OSC ON or OSC OFF
This is used to enable or disable the optimum start control (OSC)
function for event 1. To cater for different types of building construction
with differing fabric constants there are four start-up curves from which
to choose, (see the diagram over the page). These curves dictate how
long before event 1 the heating equipment will be switched on. The
selectable start-up durations are 0:00, 0:30, 1:00, 1:30 or 2:00 (2
hours). (Selecting 0 effectively disables the function).
Once initiated the difference between the space temperature and the
event 1 temperature is used to generate a pre-heat period proportional
to the OSC period selected. The closer the space temperature is to the
event 1 temperature, the shorter the pre-heat period. Refer to the
earlier section on Optimum Start Control for more detail.
It is recommended that the initial setting of the OSC is 30 minutes. See
the section on post-commissioning.
Switch No. 3 - CHRONO or ON/OFF
With this switch set to ON/OFF the TP75 will act as a conventional room
thermostat, switching the heating plant to maintain the programmed
temperature. When set to CHRONO the control function selected by
switch No. 4 is enabled.
IMPORTANT. For systems with motorised zone valves ON/OFF mode
is recommended.
Switch No. 4 - Chrono 6 or Chrono 3
This switch configures the TP75-RF to control different forms of
heating system, typically as follows:
Use Chrono 3 for high thermal inertia systems, e.g. floor standing cast
iron boilers.
Use Chrono 6 for low thermal inertia systems, e.g. low water content
boilers and combi. boilers.
See the earlier section on Chrono-proportional Control for more detail.
5.Position the slots in the top surface of the module over the lugs at the
top of the wallplate, and hinge downwards until the module is pressed
fully against the wallplate. Tighten the two screws from below to fix the
module to the wallplate.
6.Before setting the programmes the unit and circuits should be checked.
Refer to the following Commissioning Instructions.
TP75-RF Installation
The TP75-RF is supplied with a wallplate for ease of mounting. The wallplate
is used solely for fixing the electronics module to the wall and contains no
terminals.
Fixing
Fig. 2 TP75-RF or TS2 location
1.TP75-RF Select the desired fixing position. (This should adhere
to normal room thermostat practice, see Fig. 2).
Fig. 3 Wallplate fixing clearances.
2.When fixing the heating controller wallplate note that the terminals are
at the top and the vertical centre line of the heating controller is at the
right hand edge of the terminal 4 recess. Observe the clearance
required for fitting and removal, Fig. 3.
3.Fix the wallplate to the wall.
4.Before fixing the unit on to its wallplate, ensure that the four DIP
switches on the rear of the unit (see Fig. 4) have been moved to the
required settings; the choices are:-
7 day
OSC OFF
ON/OFF
Chrono 3
5/2 day
OSC ON
CHRONO
Chrono 6
Fig. 4
Factory pre-set DIP switch settings.
ABC123456
30mm min
Clearance for
screwdriver access
Wall or plaster
box mounting
holes
Aperture for
rear entry
Terminals
Knockouts for bottom
cable entry
Outline of unit
3
18.These models are supplied with a factory pre-set programme which will
be active after a RESET has been performed. The pre-set
programme is shown in the chart with the Setting Instructions.
The chart also has spaces for users own times and temperaturesas
required by them.
19.The time and programme memory are maintained by the batteries
which should last more than two years. Every 24 months the batteries
should be renewed. Internal circuitry retains the time and programme
memory for one minute, long enough for the batteries to be changed.
If the batteries volts drop, before a change is due, a battery symbol will
blink in the display. When this occurs the TP75-RF will operate
normally for 2 weeks. After the 15th midnight all relays will switch to
OFF, the unit will shut down with just the time shown. When new
batteries are fitted the unit will start to operate normally again.
Advise the User to enter their own times and temperatures in the chart on the
Setting Instructions.
Post-commissioning
Optimum Start Control
If this has been enabled, initially set to the recommended 30 minutes start-
up duration and the event 1 temperature is not achieved by the event 1 time,
then refer to the Setting Instructions and increase the start-up duration one
stage, i.e. to 1 hour.
If the space temperature at the beginning of an Optimum Start sequence is
consistently lower than the programmed event 1 temperature by more that
2°F, then the event 1 temperature may not be achieved by the event 1 time.
In this case the event 1 time should be brought forward sufficiently to
compensate, so that the comfort temperature is achieved when actually
required.
Intelligent Anticipator
If, when the heating equipment is switched on, the room temperature is 4°F
or more lower than the programmed temperature the electronic anticipation
function measures the rate of rise in the sensed temperature and will switch
the heating plant off before the programmed temperature is reached. The
residual heat in the system after the heating plant has shut down will ensure
that the comfort temperature is achieved. This will improve the comfort
conditions and minimise fuel consumption.
Commissioning
12.Lower the front flap and remove the anti-discharge paper strip from
between the batteries and their contacts, and ensure the mains power
to the control circuit is switched on.
13.Press and release the recessed RESET button to ensure the factory
pre-set programme is active.
14.Once the programming has been completed, communication between
the thermostat and the receiver module has to be established.
a)SINGLE ZONE SYSTEM WITH RX1 RECEIVER
1 -Press and hold the LEARN button of the TP75-RF for at least 3
seconds. The thermostat will now transmit a continuous signal which
contains its unique identity for a period of 5minutes.
2 -Within the 5 minute period go to the RX1 receiver module and
press both "PROG" and "CH1" buttons together and hold for at
least 3 seconds, then release.
During this process the RX1 receiver will have learnt the unique
transmission code of the thermostat and will in future react to all
transmissions from that thermostat.
To stop the continuous transmission on the TP75-RF unit pressthe
s button.
b)TWO ZONE SYSTEM WITH RX2 RECEIVER
1 -Repeat as above for zone one (CH1).
2 -Repeat steps one and two above for zone two, remembering to
press "PROG" and "CH2" on the RX2 receiver.
c)THREE ZONE SYSTEM WITH RX3 RECEIVER
1 -Repeat as above for zones 1 and 2 (CH1 and CH2).
2 -Repeat as above for zone 3, remembering to press "PROG" and "CH3"
on the RX3 receiver.
15.Establish with the customer the requirements for the operating
mode, and adjust as follows:
Clock type - 24 hour or 12 hour with AM/PM indication.
The factory pre-set is 24 hour. To convert to 12 hour, press and
hold down the NEXT and DAY buttons until the display changes,
then release. (Repeat to return to a 24 hour clock.)
Temperature display - °C or °F
The factory pre-set is °C. To convert to display all temperaturesin
°F, press and hold down the DAY and COPY buttons until the
display changes. (Repeat to return to a °C display.)
16.Check the existing space temperature by pressing and holding
down the two buttons: NEXT and COPY, until the display changes from
time to temperature.
17a.If the set temperature is below the space temperature, use the
button to raise the set temperature. The flame symbol will appear in the
display. Check that the heating plant operates correctly.
17b.If the set temperature is above the space temperature, use the
button to lower the set temperature below the space temperature. The
flame symbol will disappear. Check that the heating plant does not
operate.
4Part No: 34065 Iss: 01 06/01
Danfoss Randall can accept no responsibilty for possible errors in catalogues, brochures and other printed material. Danfoss Randall reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
Danfoss Comfort and Building Controls
3435 Box Hill Corporate Center Drive
Suite C
Abingdon, Maryland 21009
USA
Tel: 00 1 443 512 0266 Fax: 00 1 443 512 0270
Danfoss Mfg Co Ltd
7880 Tranmere Drive
Mississauga
Ontario
Canada
Tel: 001 905 676 6000 Fax: 001 905 676 0279
FCC Notice: This device complies with Pt 15 of the FCC
rules. Operation is subject to the following conditions:
1) This device may not cause harmful interference
2) This device must accept any interference received
including that which may cause undesired operation.
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