Installation
1. IMPORTANT
: ensure all electrical connections are isolated before commencing any work on the unit.
2. Unscrew the 4 security screws using MS Electronics tamperproof screwdriver MSD-152 to remove the
front cover.
3.
Mount the unit securely using any suitable fixing in conjunction with the mounting holes provided in the
unit. For optimal results, position the temperature sensor out of direct sunlight and well away from any
heating/cooling sources.
4. Connect the wiring as shown in the diagram (or any suitably appropriate form) using the convenient
pluggable terminal blocks provided. Make sure to choose the correct output terminals that are suitable
to your application.
5. On the remote sensor version, 2-core screened cable should be used to connect the remote sensor to
the thermostat. The screen should be connected to the earth terminal ONLY (do not connect the screen
to anything at the remote sensor end).
6. Adjust the internal controls to suit the operational requirements (see below).
7. Replace the cover securely using the 4 security screws
Operation
1. IMPORTANT
: ensure all electrical connections are isolated before commencing any work on the unit.
2. Adjust the “Setpoint” dial to the temperature the room is to be regulated at (typically 8ºC).
3. Set the “Differential” to the total temperature swing either side of the “Setpoint” that the room
temperature is required to keep within (typically 1°C).
4. Adjust the “Set-Back” to the temperature below the HIGH “Setpoint” to obtain the desired temperature in
LOW mode.
5. Example of a standard set-up:
HIGH mode (
RED
LED)
“Setpoint” set to 8ºC and “Differential” set to 1ºC
The unit will maintain the temperature between 7.5ºC and 8.5ºC
LOW mode (
GREEN
LED)
“Setpoint” set to 20ºC, “Differential” set to 1ºC and “Set-Back” set to 5 ºC
The unit will maintain the temperature between 2.5ºC and 13.5ºC
3
Issue 1.2
Technical Specification
Power supply:
220V - 240V AC 50Hz (live/neutral/earth)
22V - 26V AC or DC [/24V variant only]
Output switch rating:
10A, 250V AC 50Hz (resistive)
Output switch type:
Changeover relay (volt-free)
Temperature control:
[high setpoint]: -2°C to +12°C
[low setpoint]: 0°C to 14°C below the high setpoint
Temperature differential:
0.25°C to 5°C
Sensor drift:
0.15°C over 5 years
Guarantee:
5 Years
Weight:
0.31Kg
Dimensions mm:
120mm x 95mm x 35mm
Product Accessories
MSD-152
MS Electronics tamperproof screwdriver
MSD-150
Air temperature sensor (sensor only)
MSD-224
Air temperature sensor (internal, boxed)
MSD-370
Air temperature sensor (internal, faceplate)