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20. Connecting the heating / cooling
circuit and the DHW circuit
Observe the following points for
the heating circuit
Vent
An air vent valve must be installed at the highest point on the system.
The following points must be observed for the heating side:
- To prevent any existing dirt in the heating system from causing malfunctions in the
heat pump, the heating system must be thoroughly cleaned and flushed before the
heat pump is connected. This applies to new systems and in particular when replacing
an appliance.
- The flow and return on the heat pump side must be equipped with shut-off systems
and 2 BDF valves so that the condenser can be flushed when required.
Flushing the heating system
Return, heating / DHW 28 x 1
Flow, heating 28 x 1
Hose, safety valve DN 25
Flow, DHW 28 x 1
Filling the heating system
Before commissioning, the system must be filled and vented.
- Open the cap on the vent in the indoor module by one revolution.
- Open all heating circuits.
- Slowly fill the entire heating system and boiler while cold via the BDF valve at the
return, up to approx. 2 bar pressure (observe pressure gauge).
- Check the entire system for water leaks.
- Slowly open the expansion vessel.
- Switch on the heat pump.
- Vent the heating circuits completely: Use the contractor level, and under "Relay
test" select the desired pump. Then switch the pump ON for 5 seconds and OFF for
5 seconds, five times in succession.
- When the system pressure drops below 1.5 bar, top up the water.
Connection for the
vent hose