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Sequential Controller
It is allowed to configure the controller to suit individual’s need with details below:
Model Selection
1. Number of Compressor
The control can be configured into 4 main type’s base on number of compressors by
changing “R42” values:
Item Type R value
1 Single compressor 3k
2 2 compressors 7.5k
3 3 compressors 22k
4 4 compressors OPEN
Dip switch 1 Dip switch 2 Dip switch 5
a. Cooling (SQCn) Off Off Off
b. Heatpump + no heater (SQHn0) On Off Off
c. Heatpump + 1 heater (SQHn1) Off On Off
d. Heatpump + 2 heater (SQHn2) On On Off
e. Auto heatpump + no heater (SQHn0) On Off On
f. Auto heatpump + 1 heater (SQHn1) Off On On
g. Auto heatpump + 2 heater (SQHn2) On On On
Dip switch 3 Dip switch 4
a. Default Off Off
b. 0.5°C On Off
c. 1.0°C Off On
d. 1.5°C On On
2. Models
For each type, there are 3 models for the control to configure into.
n denotes number of compressor(s)
where the postfix number indicates number of compressor(s).
3. Stage Differential Temperature
Differential temperature is the temperature difference between turning on or off 1 compressor to
another compressor in thermostat cycle.
The stage differential temperature can be selected from the range shown below:
Note that 1.5°C only valid for 2 and 3 compressors model. For 4 compressors model, maximum
allowed is 1.0°C.
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