ERT30 Digital Room
Thermostat for Underfloor
Heating Applications
Product Compliance
This product complies with the essential requirements of the
following EC Directives:
• Electro-Magnetic Compatibility Directive 2004/108/EC
• Low Voltage Directive 2006/95/EEC
• EC Marking Directive 93/68/EEC
SAFETY INFORMATION
These instructions are applicable to the Salus Controls model
stated on the front cover of this manual only, and must not be
used with any other make or model.
These instructions are intended to apply in the United Kingdom
only, and should be followed along with any other statutory
obligations.
This accessory must be fitted by a Competent person, and
installation must comply with the guidance provided in the
current editions of BS7671 (IEE Wiring Regulations) and Part ‘P’
of the Building Regulations. Failure to comply with the
requirements of these publications could lead to prosecution.
Always isolate the AC Mains supply before opening or
removing the unit from the wall or wall box.
Please leave these instructions with the end user where they
should be kept in a safe place for future reference.
INTRODUCTION
A thermostat is a device that is used to switch the heating
system in your home on and off as needed. It works by sensing
the air temperature and switching on the heating when the air
temperature falls below the thermostat setting, and switching
it off once the set temperature has been reached.
The ERT30 from Salus Controls is a stylish and accurate digital
room thermostat that is fitted with a large easy to read Liquid
Crystal Display (LCD). The ERT30 benefits from simple one-touch
operation, and this thermostat has been specifically designed to
be used with underfloor heating systems.
A back light and frost function add to the features of the ERT30.
FEATURES
• Valve Protection Function (VPF)
• Large, easy to read LCD with orange display
• Stylish casing
• User friendly
• Frost protection
• Reset button
Installation
Please read the important safety information at the start of this
manual before you begin to install the device.
The ideal position to locate the ERT30 digital room thermostat
is about 1.5m above floor level. It should be mounted in a
location where the thermostat is easily accessible, reasonably lit
and free from extremes of temperature.
The electrical connections to the ERT30 are made to the internal
terminal strip. Connection details are shown below - no Earth
connection is required for the correct and safe operation of the
thermostat as the device is double insulated.
Terminal Connections
Terminal Description Terminal Block
Switched Output
L Mains Live
N Mains Neutral
Temperature setback (230V AC input)
24V Switching
Terminal Description Terminal Block
Switched Output
L1 Mains Live
L2 Mains Neutral
Temperature setback (24V AC input)
After installing the ERT30 in a suitable location, wiring
connections can be made as shown above. The following criteria
apply to the installation:
• The incoming AC mains supply should be 230V AC and fused at 2 amps.
• Optimum cable size for installation is 1.5 mm2; wiring colours
should be in accordance with the current requirements of the
IEE Wiring Regulations.
• All wiring connections should be securely made, and be firmly
terminated within each of the terminal screw clamps.
Do not restore the mains supply to the system until all associated
items are fully installed.
NOTE: All electrical installation work should be carried out by a
suitably qualified Electrician or other competent person. If you
are not sure how to install this programmable thermostat consult
either with a qualified electrician, heating engineer or your
boiler / heating system supplier for advice on how to continue.
Do not remove or refit the ERT30 wiring without the
mains supply to the system being isolated.
Switch and Jumper Settings
Changes to the switch or jumper settings should only be
made by the Engineer carrying out the installation or
other qualified person.
The installer should select the switch or jumper positions required
if changes need to be made to the factory default settings.
Switch Position Function
System HEAT – Heating system (default)
COOL – Cooling system
Jumper Position Function
J1 – Setback ON - Enable (default)
Function OFF - Disable
J2 - Output ON – PWM output (default)
Control Type OFF – On/Off output
J3 - Valve ON - Enable (default)
Protection (VP) OFF - Disable
N.B: If the System switch is set to ‘Cool’, PWM mode is
automatically disabled. In this case the ERT30 will only operate
in On-Off mode, even if the Output Control DIP switch is set for
PWM mode.
After Installation
After completing installation and powering up the ERT30 for
the first time the thermostat will behave in the following way:
All the indicators on the display and the backlight will be turned
on for two seconds. After two seconds, the ERT30 will then
operate in Normal mode
(controller output OFF), and
display the current room
temperature.
If the Reset Button is pressed, the ERT30 will behave in the same
way as described above, except that any previously saved user
settings will be deleted and overwritten with the default
settings.
Function Default Value
Operation Mode Normal
Room Temperature 22ºC, updated within a few seconds
All Set Point Temperatures 20ºC
ºC Indicator On
Setback Indicator Off
Heat Indicator Off
Output Relay Off
N.B: Please be aware that after a Reset, the ERT30 output relay
may turn ON if the room temperature is lower than the Set
Point temperature.
USER INTERFACE AND CONTROLS
The status and operation of the ERT30 can be clearly seen on
the large orange backlit Liquid Crystal Display (LCD) - this display
allows the user to see at a glance the current status of the
heating system.
There are few user controls for the ERT30, making the controller
very easy to operate. These controls are shown below, along
with a description of each of their functions.
User Control Function Summary
Key / Operation Symbol Functions
MINUS (-) key Decreases the selected setting
PLUS (+) key Increases the selected setting
RESET button Resets the controller to
default (original factory)
settings
Operation
As previously described, the ERT30
is configured and adjusted by the
use of an intuitive user interface
with a minimal number of user
controls, and the backlit LCD gives
a highly visible, easily readable
indication of the thermostat status.
LCD Indicator Function Summary
Indicator Symbol Function
FROST (left hand Indicates frost protection mode is active
side on display)
CRESCENT Indicates setback temperature mode is active
TEMPERATURE Indicates either current room temperature
or set point temperature
Right hand side Indicates cooling mode is active.
on display
HEATING Indicates heat control mode is active
Checking the Set Temperature
Pressing either the PLUS or MINUS
key once will display the current Set
Point temperature:
After three seconds without a key press, the ERT30 will return to
NORMAL mode and will display the current room temperature.
Adjusting the Set Point Temperature
Adjusting the Set Point temperature
is done with the ERT30 in NORMAL
mode. Press either the PLUS or
MINUS key twice to enter setting
mode. After doing this, the
displayed Set Point temperature will
flash:
Press the PLUS or MINUS key to increase or decrease the Set
Point temperature within the range of 10 °C to 35 °C, in 0.5 °C
steps. The Set Point temperature will stop flashing while being
adjusted, but will flash again once the key is released. Pressing
and holding the PLUS or MINUS key for two seconds will
increase or decrease the setting quickly.
The thermostat will return to NORMAL mode after 5 seconds if
no key is pressed.
Frost Protection Mode
The ERT30 has a Frost Protection
mode, but this is only active when the
thermostat is operating in HEATING
mode. The Frost Protection mode
temperature is preset at 5 ºC; this temperature is factory set and
cannot be adjusted.
To enable Frost Protection press the PLUS and MINUS keys
together for 3 seconds, then release them. The display will then
display the Frost Protection Set Point and Frost icon:
To disable Frost Protection and return the thermostat to
NORMAL mode, press the PLUS and MINUS keys together for 3
seconds.
Temperature Offset
To adjust the temperature offset press both the + and – buttons
in together until SEt appears in the display window you can
then make your required changes with the + or – buttons in
steps of 0.5°C ranging from -3.5ºC to +3.5ºC. Changes will then
be saved. When all changes are complete the ERT30 will revert
back to the current room temperature if no further buttons are
pressed for 5 seconds.
OTHER FUNCTIONS AND CONTROLS
Backlight
The backlight of the ERT30 is switched on automatically
whenever any of the keys are pressed. The backlight will remain
illuminated for approximately 5 seconds after the last key press.
If the room temperature is higher than 35 °C, the backlight will
blink on and off.
The backlight will not illuminate if there is no mains supply to
the controller.
Control Status
The ERT30 indicates on the LCD the control status by using a
selection of display icons.
The display will show animated flame icon when in HEATING
mode.
The display will show an animated snowflake icon when in
COOLING mode.
Reset Button
The Reset Button is provided as a way to restore the heating
controller to its default factory settings. Pressing this button
will delete any previously entered settings.
Setback Temperature
The ERT30 has a provision to set a setback temperature; this is
automatically fixed at 4 °C below the current set point
temperature for Heating, and 4 °C above the current set point
temperature for Cooling.
The Setback feature will only operate if a connection is made
to the Setback terminal . The terminal is sampled every
second, and if the terminal state is HIGH (above 175V AC), the
Crescent indicator will be shown on the display, and the Setback
temperature will be applied.
Temperatures outside the Operating Range
Temperatures below 10 °C are displayed without the leading ‘0’.
Temperatures exceeding the measurable range will be indicated
by ‘HI’ for temperatures above the upper limit, and ‘LO’ for
temperatures below the lower limit, as shown in the images
below:
Valve Protection Function
The Valve Protection (VP) function is provided as a way to avoid
the control valve from sticking or seizing when not being used
for long periods (e.g. during the summer).
This function is enabled by setting the Valve Protection jumper
to the enable position. When enabled, the VP function will turn
on the thermostat output to operate the control valve for a
period of 5 minutes every week: the VP function will still
operate even if the room temperature is higher than 35 °C.
Pulse width modulation
Radiant panel heating systems tend to have a problem with
overshooting, i.e. rooms continue to be heated even after the
desired temperature has been reached and the valve has been
closed. The ERT30 solves this problem electronically and
especially effectively using what is known as pulse width
modulation. By continuously comparing set temperature with
actual temperature, the lengths of opening times for the valves
actuators are regulated in such a way the temperature is almost
completely prevented from exceeding or falling below the set
temperature. In this way, the required temperature setting is
regulated in a precise and convenient way.
Note: When the ERT30 is used with radiator or convector
heating systems, pulse width modulation can be switched off if
necessary (see basic settings section)
ENERGY TIP
One way to set and use your room thermostat is to find the
lowest temperature setting that you are comfortable with, and
then leave it set at this temperature. You can do this by setting
the room thermostat to a low temperature, (for example 17 °C)
and then increasing the setting by one degree each day until
you are comfortable with the room temperature - you won’t
have to adjust the thermostat further, as adjustment above this
setting will waste energy: a 1 °C increase in temperature is equal
to 3% of your heating costs.
Maintenance
The ERT30 digital room thermostat requires no special
maintenance. Periodically, the outer casing can be wiped clean
using a dry cloth (please DO NOT use solvents, polishes,
detergents or abrasive cleaners, as these can damage the
thermostat).
There are no user serviceable parts within the unit; any servicing
or repairs should only be carried out by Salus Controls or their
appointed agents.
Should the ERT30 room thermostat fail to function correctly,
check:
• Mains supply to the ERT30 is switched on.
• Heating system is switched on.
• If the ERT30 is still not functioning correctly,
press the Reset Button.
WARRANTY
Salus Controls warrants that this product will be free from any
defect in materials or workmanship, and shall perform in
accordance with its specification, for a period of two years from
the date of purchase. Salus Controls sole liability for breach of
this warranty will be (at its option) to repair or replace the
defective product.
Product Specification
Model: ERT30
Type: Non-programmable digital room thermostat
designed for underfloor heating applications.
Operation
Control Method:
1. PWM control (default)
2. On – Off control
Temperature Measurement
Temperature display range: 5.0 ºC – 45.0 ºC
Temperature display resolution: 0.5 ºC
Temperature setting range: 10.0 ºC – 35.0 ºC
Temperature setting resolution: 0.5 ºC
Frost protection setting: 5.0 ºC
Memory Backup
Type: Internal memory (EEPROM)
Switching
Switching Voltage: 230V AC / 50Hz
Switching Current: Switching current 0.2A resistive
IP30 Class 2
Environment
Operating Temperature: 0ºC to + 40ºC
Storage Temperature: - 20ºC to + 60ºC
Salus Controls plc, Salus House, Dodworth Business Park
South, Whinby Road, Dodworth, Barnsley S75 3SP
Sales Email: sales@salus-tech.com
Tel: +44 (0) 1226 323961 Fax: +44 (0) 1226 240588
Technical Email: tech@salus-tech.com Tel: 01226 323961
Model No: ERT30
