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Installation Guide
Sizing of copper discharge pipe (4) for common temperature relief valve outlet sizes
Valve outlet size Minimum size of dis-
charge pipe (2)
G1/2
15mm
G3/4
22mm
G1
28mm
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.
N
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.
24
MBH
Minimum size of dis-
charge pipe (4 from
tundish)
22mm
28mm
35mm
28mm
35mm
42mm
35mm
42mm
54mm
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.
086L5801 rev 2
Maximum resistance allowed, ex-
pressed as a length of straight pipe
(that is, no elbows or bends)
Up to 9m
Up to 18m
Up to 27m
Up to 9m
Up to 18m
Up to 27m
Up to 9m
Up to 18m
Up to 27m
Resistance created by
each elbow or bend
0.8m
1.0m
1.4m
1.0m
1.4m
1.7m
1.4m
1.7m
2.3m
Thermia AB
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