14 – Appendix UK
4 Commissioning
4.1 How to flush the tap water system
When the tap water and the heating system have been filled up, the unit shall be running at maximal, nor-
mal operating temperature for a minimum of one hour. After that the tap water system shall be flushed out
and re-filled.
4.2 How to drain the tap water system
After the tap water system has been flushed out, the cold and hot water pipes and the water heater tank
need to be drained. To drain the system follow the instructions below:
1. Close the shut-off valve on the incoming water supply.
2. Open both cold and hot water taps which are situated as low as possible in the building to depressu-
rise the system.
Please note that there can be some water remaining in the cold water pipe which must be taken care of
when loosening the pipe.
3. Loosen and remove the cold water pipe at the top of the heat pump.
4. Insert a plastic hose to use as a siphon into the cold water connection and bring it to the bottom of
the water heater tank.
5. Place the other end of the hose near a gully.
6. Use the siphon effect to empty the water heater tank.
For location and dimension of connections, please see chapter 4.1 in the Installation Instructions.
4.3 Inspection access
The hot water tapping connection can be used as an inspection access.
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