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10. Controller Configuration

A) 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 types 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

2. Models

For each type, there are 3 models for the control to configure into.

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

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 :

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

note that 1.5°C only valid for 2 and 3 compressors model. For 4 compressors model,

maximum allowed is 1.0°C.

The default differential temperature is base on number of compressor model, the

setting is as below :

Model Diff. Temperature

1 compressor Not applicable

2 compressor 0.5°C

3 compressor 1.0°C

4 compressors 1.5°C

4. Hot Keep Option

Dip switch 6

a. Fan off off

b. Fan on on

5. Operating Modes

The system has 4 operating modes to select with respect to each model selection:

Model Auto Cool Heat Fan

SQCn - X - X

SQHnh - X X X (Dip switch 5 = off)

SQHnh X X X X (Dip switch 5 = on)

Where x denotes modes available

n = number of compressor(s)

h = number of heater(s)

6. Last Memory Functions

The power up settings for either with or without the last memory backup is based on

the JH1 setting.

JH1 Setting

a. Last memory backup JH1 Plugged

b. Without last memory backup JH1 Removed

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