Passive cooling
The cooling circuit is cooled down by transferring thermal energy to the brine circuit
(see section
Free cooling
). If the cooling circuit temperature does not fall down to its
setpoint within a predetermined period (
Delay
), the system switches over to
Active
cooling
.
Active cooling
The ground source heat pump uses the compressor to extract heat from the cooling
circuit and transfer the heat into a storage tank.
Excess heat transmission
If storage tank temperature rises too high during active cooling, heat exchangers
are used to transmit the excess heat to the brine circuit or evaporate the heat to the
atmosphere.
OFF
Cooling is not used.
Cooling control
Cooling control is based on operating modes as well as solenoid valve and circulation
pump control. Solenoid valve positions for each operating mode must be set in the
Maintenance menu.
In the Maintenance menu, you can set the control mode to
Room temperature
or
External
. These modes function in the same way as in
Free cooling.
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