Ground Water System: Electrical Connection; Connecting The Heat Pump To The Heating System - IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual

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.
Motor cut-out
Contactor
Groundwater pump
G8 (P8)

Connecting the heat pump to the heating system

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.
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.
Terminal card in
the heat pump
Alarm input
HTF pump G3 (P3)
51
Connecting the heat pump to the heating system
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.
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.
Note
Only qualifi ed installers may carry out
the installation. The installer should
observe applicable regulations and our
recommendations.