Salus ERT50 User manual

Instruction Manual
Model No
ERT50
ERT50
Digital Room Thermostat
for Underoor
Heating Applications

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2
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.

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INTRODUCTION
A programmable thermostat is a device that combines
the functions of both a room thermostat and heating
controller into a single unit. The programmable
thermostat is used to switch the heating system in your
home on and off as needed. It works by controlling
the temperature according to a series of programmed
settings that take effect at different times of the day.
The ERT50 from Salus Controls is a stylish and accurate
digital room thermostat that is tted with a large easy
to read Liquid Crystal Display (LCD). The ERT50 benets
from simple one-touch operation, and this thermostat
has been specically designed to be used with underoor
heating systems. A back light and frost function adds to
the features of the ERT50.
Features
•Valve Protection Function (VPF)
•Night Setback (NSB) capability
•Solid State Relay output
•Large, easy to read dot matrix 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 ERT50 digital room
thermostat is about 1.5m above oor 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 ERT50 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
N Mains Neutral
Switched Output
L Mains Live
Temperature setback
(110V AC input)
After installing the ERT50 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 110V AC
and fused at 5 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 rmly terminated within each of the terminal
screw clamps.
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110V
60Hz

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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 qualied Electrician or other competent person. If you
are not sure how to install this programmable thermostat consult
either with a qualied electrician, heating engineer or your
boiler / heating system supplier for advice on how to continue.
Do not remove or refit the ERT50 wiring without the
mains supply to the system being isolated.
SETTING MODES
When the ERT50 is rst powered up, the Start Up Display
will be shown.
Basic Settings
Many of the ERT50 conguration and operating settings
can be changed here. Press any key to turn on the
backlight, press CANCEL key, press and hold the SELECT
and CANCEL keys together to enter program setting press
+ or - key to “Basic Setting”, and press SELECT.
To change any of the basic settings, press the SELECT this
will access the Program/Basic settings menu.
Use the PLUS (+) or MINUS (-) keys to choose the item you
want to change and press the SELECT key to change to the
setting menu for that item. Pressing the CANCEL key will
exit from this menu and return you to the previous menu.

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DATE AND TIME:
Press the PLUS or MINUS key to change the day setting,
then SELECT to save your choice. Do exactly the same for
the month and year. You can then choose whether to use
a 12 or 24 hour time display (the default is 24 hour).
The time is set in the same way as the date – use the
PLUS or MINUS keys to change the setting, and save
by pressing SELECT.
The last menu item is Daylight Saving – by default this is
turned on. Change the setting using the PLUS or MINUS keys,
then press the SELECT key to save the settings and return to
the Program/Basic settings menu.

LANGUAGE:
The ERT50 is programmed to operate in eight different
languages (the default is English). If you wish to change
the language used, select Language from the Program/
Basic Settings screen.
Select your choice of language with the PLUS or MINUS
keys, then press SELECT to save your choice and return to
the Program/Basic Settings screen.
Pressing CANCEL will return to the previous screen
without saving any changes. You can also access the
Language menu by pressing the MENU and SELECT keys
and the RESET button together.
MAINTENANCE:
The Maintenance menu allows you to view operating
times for the heating system. The ERT50 will record
operating time up to a maximum of 99,999 hours.
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Select the Read Operating Time entry to see a summary of
the system operating times.
This screen will show the date the operating times were last
reset, total operating time and total actuator open time.
The timers can be reset by selecting the Reset Operating
Time item.
Select Yes and then press the SELECT key to reset the timers
to 0.
Press the CANCEL key twice to return to the Program menu.

CONTROL SETTINGS
The Control menu allows changes to the Temperature
Span, Communications, Frost Protection, Output, Valve
Protection and Temperature Offset settings.
To access this menu, select the Control item from the
Program menu.
Temperature Span:
The rst setting that can be changed is Temperature Span.
The default setting is 0.5 °C, but this can be changed to
1.0 °C. Press the SELECT key to save your changes.
COMMUNICATIONS:
The Communicate menu item has several setting options,
some of which are only relevant when there is more than
one thermostat in the installation and they are congured
in a Master/Slave relationship.
The rst option allows you to turn Night Setback on or
off. The Setback feature will only operate if a connection
is made to the Setback terminal .
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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.
You can only change the other Communications options
if NSB is set to OFF – if NSB is turned ON the ERT50 will be
set as the Master unit and will only send a signal to any
Slave units, not receive a signal from them.
With NSB set to Off, you can then change the other
communications options by using the PLUS and MINUS
keys. The available options are COM Off, COM 4 ºC and
COM 2 ºC. If COM Off is selected, no setback signal will
be sent to the Slave thermostat. With COM 4 ºC or COM
2 ºC selected, the slave thermostat temperature will
be reduced or increased by 4 ºC or 2 ºC, depending on
whether the system is in Heating or Cooling mode.
After choosing your option, press the SELECT key to save
your selection and exit from the menu.