Mounting; General Information; Heating-Side Connection; Frost Protection - Buderus WPL 80AMR Montage- Und Gebrauchsanweisung

6

Mounting

6.1 General Information

The following connections need to be made on the heat pump:
supply/return lines of the heating system
condensate drain
control lead to the heat pump controller
power supply

6.2 Heating-Side Connection

The connections on the heating side of the heat pump are provi-
ded with 1" external thread. The hoses to be connected exit the
unit through its base plate. When carrying out the connections,
use a wrench to counterhold at the transitions.
Before completing the heat pump connections on the heating
water side, the heating installation must be flushed in order to re-
move any impurities that may be present, residues of sealing
agents, or the like. Any accumulation of residues and other depo-
sits in the condenser may result in a total failure of the heat
pump. On systems equipped with heating water flow shut-off de-
vices such as radiator or thermostat valves, an overflow valve to
be provided by the customer needs to be installed at the outlet of
the heating pump in a heating bypass. This assures a minimum
heating water flow through the heat pump and prevents any mal-
functions from occurring.
Once the installation on the heating side has been completed,
the heating system must be filled, de-aerated and pressure-tes-
ted.
Minimum heating water flow rate
The heating water minimum flow rate through the heat pump
must be assured in all operating states of the heating system.
This can be accomplished, for example, by installing a differential
pressure-free manifold or an overflow valve. The procedure for
setting an overflow valve is described in the Chapter Commissio-
ning.

Frost Protection

On heat pumps installed in a location prone to frost, a manual
drain valve (see figure) should be provided. Provided the control-
ler and heating circulating pumps are ready for operation, the
frost protection feature of the controller is active. If the heat pump
is taken out of service or in the event of a power failure, the sys-
tem has to be drained. In heat pump installations where a power
failure cannot be readily detected (holiday house), the heating
circuit must contain a suitable antifreeze product.

6.3 Electrical Connection

The power connection of the heat pump is effected via a stan-
dard 3-core cable.
The cable has to be supplied by the client and the wire cross-sec-
tion to be selected according to the power consumption of the
heat pump (see Equipment Data in the appendix) as well as the
relevant EN (VDE) and VNB regulations.
The power supply of the heat pump must be equipped with a dis-
connecting device with a contact gap of at least 3 mm (e.g. utility
service contactor, power contactor) as well as a 1-pole automatic
circuit breaker (tripping current as stated in the Equipment Data).
The control voltage is supplied via the control lead and the heat
pump controller.
The 230V AC-50 Hz power supply of the heat pump controller is
effected as described in its instruction manual (fusing 16 A).
The control lead (not included in the scope of delivery) is connec-
ted to the heat pump controller by means of the two rectangular
connectors. In the heat pump, the plug connector located at the
bottom of the unit in the immediate vicinity of the lead feed-th-
rough through the base of the unit is to be used. More detailed in-
structions are contained in the instruction manual of the heat
pump controller.
For more detailed information refer to the wiring diagrams in the
appendix.
6.3
E-5