Troubleshooting guide

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.