Gebwell Qi Series Installation, Operation And Maintenance Manual page 22

The domestic water system must be equipped with a safety
valve (max 10bar) installed in the cold water line as shown
in the figure. It is recommended to lead the overflow pipe
of the safety valves to the nearest floor drain. Install the
overflow pipe so that the water can flow out of the pipe
without obstructions.
The domestic water safety valve may leak nearly every
time higher consumption of warm domestic water ceases.
The overflow is caused by the thermal expansion of cold
water and pressure shocks. The safety valve leak can be
prevented by installing an expansion vessel in domestic
water network. The vessel evens out the pressure changes
and prevents pressure shocks.
Accumulator tank for the domestic water system
If the consumption of domestic water is high, the heat
pump can be supplemented with an electrically heated
additional accumulator. The heat pump heats the cold
water in the internal accumulator, after which the water is
led to the external buffer accumulator. The electric
resistance of the external accumulator maintains the
temperature at the desired level. The system uses the
external accumulator to prepare for spikes in the
consumption of heat energy.
Use an external accumulator if the building features
domestic hot water
circulation connected to the heat pump may in some cases
weaken the thermal layering in the pump's internal
accumulator and, therefore, increases the number of times
the compressor requires activation.
22
HW
CW
circulation. Domestic
Domestic hot water circulation to heat pump's
accumulator
Heat pump's domestic water accumulator is equipped
with a connection to domestic hot water circulation. The
flow of the circulation is adjusted carefully to ensure
proper functioning of the accumulator. Too high flow
weakens the thermal layering in the pump's internal
accumulator and, thus increases the number of times the
compressor requires activation.
HW
water
HWC
CW
CW
HWC
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