McQuay M5MAC Guía para resolver problemas descargar pdf (Pagina 38)

McQuay Service Guide Book

6.5 Sequential Controller

It is allowed to configure the controller to suit individual’s need with details below:

1. 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).

2. 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 compressors 0.5°C

3 compressors 1.0°C

4 compressors 1.5°C

3. Hot Keep Option

Dip switch 6

a. Fan off Off

b. Fan on On

45. 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)

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 89 90

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McQuay M5MAC Guía para resolver problemas Pagina 38

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