McQuay MDB075B Manual page 100

3. Auto Mode Selection
a. Auto mode off
b. Auto mode on
Note : Factory preset : SW5 = off ~ auto mode off
4. 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 :
a. Default
b. 0.5°C
c. 1.0°C
d. 1.5°C
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
1 compressor
2 compressor
3 compressor
4 compressors
5. Hot Keep Option
a. Fan off
b. Fan on
6. Operating Modes
The system has 4 operating modes to select with respect to each model selection:
Model Auto
SQCn
SQHnh
SQHnh
Where x denotes modes available
n = number of compressor(s)
h = number of heater(s)
7. Last Memory Functions
The power up settings for either with or without the last memory backup is based on the JH1 setting.
a. Last memory backup
b. Without last memory backup
Dip switch 3 Dip switch 4
off
on
off
on
Diff. Temperature
Not applicable
Dip switch 6
Cool
- X
- X
X X
JH1 Setting
JH1 Plugged
JH1 Removed
SW5(dip 5)
off
on
off
off
on
on
1.5°C
1.0°C
0.5°C
off
on
Heat Fan
- X
X X
X X
99
(Dip switch 5 = off)
(Dip switch 5 = on)