Sizing of copper discharge pipe (4) for common temperature relief valve outlet sizes
Valve outlet size Minimum size of dis-
charge pipe (2)
Minimum size of dis-
charge pipe (4 from
tundish)
Maximum resistance allowed, ex-
pressed as a length of straight pipe
(that is, no elbows or bends)
Resistance created by
each elbow or bend
G1/2 15mm 22mm Up to 9m 0.8m
28mm Up to 18m 1.0m
35mm Up to 27m 1.4m
G3/4 22mm 28mm Up to 9m 1.0m
35mm Up to 18m 1.4m
42mm Up to 27m 1.7m
G1 28mm 35mm Up to 9m 1.4m
42mm Up to 18m 1.7m
54mm Up to 27m 2.3m
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, normal operating temperature for
a minimum of one hour. After that the tap water system shall be flushed out and re-filled.
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 depressurise the system.
Please note that there can be some water remaining in the cold wa-
ter 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.
Installation Guide DWH
Danfoss Heating Solutions
VMBNB82J
19
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