McQuay MWSS Guide de dépannage télécharger pdf (Page 29)

MCQUAY Service Guide Book Controller Configuration

5.3 Sequential Board (SQ2.0)

Dip switch setting of sequential controller are as

the following:

Main Board SQ2.0

1. Models Selection

Model

Dip

switch 1

Dip

switch 2

a. No heater Off Off

b. 1 heater On Off

c. 2 heater On/Off On

Where n = no. of compressor(s)

Postfix no. = no. of heater(s)

2. Stage Differential Temperature

Differential temperature is the temperature

difference between turning on or off a 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: 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 compressors 1.5°C

3 compressors 1.0°C

4 compressors 0.5°C

3. Operating Modes

The system has 4 operating modes to select with

respect to each model selection:

Model Auto Cool Heat Fan Dip

switch

SQCn - X - X Off

SQHnh - X X X Off

SQHnh X X X X On

Where x denotes modes available

n = no. of compressor(s)

h = no. of heater(s)

4. Hot Keep Option

Dip switch 6

a. Fan off Off

b. Fan on On

5. Last Memory Functions

The power up settings for either with or without

the last memory Backup is based on the J_LST

setting.

J_LST Setting

a. Last memory Backup J_LST Plugged

b. W/o last memory Backup J_LST Removed

*For SQ1.0, the jumper is JH1.

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McQuay MWSS Guide de dépannage Page 29

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