5
Issue 1.1
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 when in HIGH mode
(typically 21ºC).
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.
Example of a typical set-up:
“Setpoint” set to 22ºC, “Differential” set to 1ºC and “Set-Back” set to 4ºC.
HIGH mode (Remote Switch input CLOSED) (
RED
LED):
The unit will maintain the temperature between 21.5ºC and 22.5ºC.
The High fan speed will be selected upon fi rst entering this mode.
The Low fan speed will be selected once the target temperature is reached.
LOW mode (Remote Switch input OPEN) (
GREEN
LED):
The unit will maintain the temperature between 17.5ºC and 18.5ºC.
The Low fan speed will always be selected in this mode.
Technical Specifi cation
Power supply:
85V - 265V AC 50 - 60Hz (live/neutral/earth)
Output switch rating:
10A, 250V AC (resistive)
Output switch type:
On/Off: Single contact relay (volt-free)
High/Low: Changeover relay (volt-free)
Temperature control:
[high Setpoint]: +12°C to +26°C
[low Setpoint]: 0°C to 14°C below the high Setpoint
Temperature differential:
0.25°C to 4°C
2-stage control:
2 speeds (High/Low) + Off
Sensor drift:
0.15°C over 5 years
Guarantee:
5 Years
Weight:
0.34Kg
Dimensions mm:
120mm x 95mm x 35mm
Product Accessories
MSD-152
M.S. Electronics tamperproof screwdriver
MSD-150
Air temperature sensor (sensor only)
MSD-224
Air temperature sensor (internal, boxed)
MSD-370
Air temperature sensor (internal, faceplate)
