Models 3.2 - 13.2, controller µchiller
Blue Box - Page 62
Figure 26
Figure 27
Figure 29
Figure 28
6.2 STARTING THE UNIT
The SIGMA 2002 unit is equipped, as standard, with direct keypad control.
Optionally the unit can be equipped to operate via a remote permissive (e.g. a clock, etc.). The remote interlock
must be connected across terminals 1-2. Enabling the unit to start or stop is only possible via the keypad.
6.2.1 COOLING:
- Press the button as shown in figure 26.
6.2.2 HEATING (operation in heat pump mode):
- Press the button as shown in figure 27.
6.3 STOPPING THE UNIT
6.3.1 Temporary stop
The unit is stopped by pressing the cooling key or, in the case of a heat pump unit operating in winter mode, by
pressing the heating key.
Shutdown of unit operating in summer cooling mode
Shutdown of unit operating in winter heating mode
Warning: do not use the machine main power switch to stop the unit.
The crankcase heaters will be disconnected, resulting in serious risk to
the compressors when the unit is started again.
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