Instruction manual

14
Connecting the heat pump to the heating system
Note
Only qualifi ed installers may carry out
the installation. The installer should
observe applicable regulations.
It is important that all previously mentioned preparations have been
carried out before the heat pump is connected to the heating system. Also
ensure the system has been power fl ushed before it is connected to the
heat pump. Flushing protects the heat pump from contamination.
Oxygen must not enter the system. The heat pump is only intended
to work in oxygen free systems. If oxygen enters the system it causes
corrosion in the heat pump which could block the fi lter on the heating
system side.
Connecting to the heating system without a bypass:
The heat pump can be connected to the heating system without a bypass, as the circulation in the heat pump and the
heating system is managed by the integrated pump G2 (P2). However minimum fl ow of at least 70% of the nominal fl ow
(see the table below) must be maintained throughout the year. Thermostatic radiator valves should be fully open and
underfl oor heating systems should have at least half of the coils fully open at all times. The control unit gives an alarm
when the return differential temperature exceeds 13ºC.
If the heating system is designed so that at least 70% of the nominal fl ow cannot be guaranteed, the heat
pump should be connected using a bypass and an external main pump G1 (P1).
Hot water function:
Hot water production is started by the hot water sensor T3 (GT3), and is stopped by the return sensor T9 (GT9).
Heating system pump
The circulation pump G2 (P2) is a Wilo Star 25/6-130.
Connecting the heat pump to the heating system
Maximum system pressure drop in the
heating system
The maximum system pressure drop and the minimum fl ow that
the integrated circulation pump can operate with is presented
in the table. If the minimum fl ow cannot be guaranteed a
bypass and an external main pump G1 (P1) should be
installed. Ensure that TRV’s cannot close down and restrict the
required fl ow.
Pressure height (H)
Flow (Q)
Heat pump model Nominal fl ow [*] Minimum fl ow [*] Max system pressure drop [**]
Greenstore 6 0.20 l/s 0.14 l/s 36.0 kPa
Greenstore 7 0.25 l/s 0.18 l/s 36.0 kPa
Greenstore 9 0.31 l/s 0.22 l/s 34.0 kPa
Greenstore 11 0.38 l/s 0.26 l/s 32.0 kPa
[*] litres/second
[**] kiloPascal