52
FOR THE INST
ALLER
Connecting the heat pump to the heating system
Ground water system: Electrical connection
1. Connect the ground water pump to the mains (3 x 400 V) via a motor
cut-out and a contactor. The control to the contactor (CK3) uses 230 V,
which is taken from the terminals L and N (P3) in the heat pump.
2. Connect the auxiliary contact for the motor cut-out MB3 in series with
the alarm input MB2. This method starts and stops the groundwater
pump with the heat pump’s HTF pump. If the motor cut-out MB3 trips,
the heat pump stops and the alarm for the HTF pump is displayed on
the menu display.
Groundwater pump
G8 (P8)
Terminal card in
the heat pump
Contactor
Motor cut-out
Note
There is a built-in motor cut-out in
the pump on the 11-17 kW models.
Models 6-9 kW have a strap fi tted
between L and MB2 on the terminal
card.
Alarm input
HTF pump G3 (P3)
Warning
If a single phase pump is used, it
should
always
be connected with
a contactor.
It must never be connected to the P3
output on the heat pump as this can
damage the control unit.
Connecting the heat pump to the heating system
Note
Only qualifi ed installers may carry out
the installation. The installer should
observe applicable regulations and our
recommendations.
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 pipe system has been well fl ushed before it is connected to the
heat pump. Flushing protects the heat pump from contamination.
The heating system must be diffusion-proof. Oxygen must not enter the
system. The heat pump is only intended to work in oxygen free systems
with so-called “dead water”. When oxygen enters the system this causes
corrosion in the heat pump and clogging of the fi lter on the heat transfer
side. An intermediate heat exchanger is necessary in systems with oxygen
penetration/diffusion to protect the heat pump.