Installation of heat pump and domestic hot water tank
21.11.2015
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Z20469
Copyright
2013 by: WATERKOTTE GmbH. Subject to changes.
8.5
Connection to heating system
The connected systems should be technically clean and free from air. Steel pipes
and other steel components in the water circuit shall not be used when connect-
ing diffusion-open surface heating system. In exceptional cases an effective corro-
sion inhibitor must be added and a dirt trap (0.8 mm mesh) connected before en-
try into the unit. The system must then be marked accordingly and the mainte-
nance instructions of the supplier must be followed strictly. Designation for inlet
and outlet must be observed. When there is danger of frost, add antifreeze to
protect against formation of ice.
To ensure tension-free connection of the heat pump, a flexible connection is re-
quired!
Tip:
We recommend the use of external shut-off devices (ball valves) at all connections.
Thus, if service is required, only the minimum amount of heat transfer medium has
to be drained from the system and time-consuming venting measures can be
avoided.
In factory default setting, the pipe ends are closed with plastic caps. When con-
nection is performed, these caps must be removed and the connecting unions
screwed on with suitable gasket.
To tighten the screw connections, resistance at the cap must be provided with
suitable tool!
To prevent corrosion and scale formation in the heating system (circulating
pumps, radiators, etc.), the heating water must be treated according to VDI 2035
(e.g. with corrosion inhibitor).
To find the volume flow at heating side for the corresponding heat pump,
please refer to the performance table (chapter 19), (5K spread).
The heating connections (1¼“) feature an external pipe thread for flat-sealing
connections with union nut and insert.
In the heat pump is installed:
• An air separator with 6 kW electrical resistance heating.
8.5.1
Installations provided by customer
An expansion tank and a safety group (manometer, relief valve) have to be in-
stalled by customer.
Mounting position see diagram (chap. 18).
A second pressure expansion tank must be connected if, for instance, a compact
condensing boiler (for domestic hot water production with the WATERKOTTE wa-
ter heater) or a buffer tank (for heating) is planned.
