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Applications Manual
1 0 4 | Bosch Geothermal Heat Pumps
Fig. 123
16.7 Bosch Geothermal Water-to-Water Heat
Pump Sequence of Operation
Cooling Mode
Energizing the "O" terminal energizes the unit reversing
valve in the cooling mode.
When the thermostat calls for cooling (Y), the loop
pump or solenoid valve if present is energized and the
compressor will start. Once the thermostat is satis ed,
the compressor shuts down accordingly. Note that a
fault condition initiating a lockout will de-energize the
compressor.
Heating Mode
Heating operates in the same manner as cooling, but
with the reversing valve de-energized. The compressor
will run until the desired set point temperature on the
thermostat is achieved. Once the thermostat is satis ed,
the compressor shuts down.
Data subject to change
Bosch Thermotechnology Corp.
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