50
FOR THE INSTALLER
Preparations before connection
Supplementing the heat pump with a
ground water system
If the heat pump is installed for groundwater instead of rock, soil or lake, it
must be supplemented with an intermediate heat exchanger. The interme-
diate heat exchanger protects the heat pump from contamination, clogging
and freezing.
A groundwater pump with non-return valve is installed at the bottom of
the bore hole. The pump is used to pump the groundwater from the water
source to the intermediate heat exchanger. Heat is transferred to the
heat transfer fl uid in the intermediate heat exchanger. The water is then
pumped to a recharge well. The intermediate exchanger is installed in the
boiler room or the like.
The circuit to the heat pump is installed in the same way as described
earlier i.e. with fi lling unit, expansion vessel and safety valve. The circuit
should also be protected against freezing down to -15ºC.
Note
The intermediate heat exchange
should be connected against the fl ow.
In addition, the pipe from the ground-
water well is connected to the bottom
of the intermediate heat exchanger so
that the fl ow goes upwards.
To the heating system
Exp.
Safety valve
Filling unit
Intermediate heat
exchanger
Filter
Groundwater
Recharge well
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