Checking Safety Valves; Cleaning Strainer - Danfoss DHP-AT User Manual

User Guide
8.3

Checking safety valves

Warning
Both safety valves must be checked at least four times a year to prevent lime deposits clogging the mechanism.
Both safety valves is checked by turning the cap a quarter of a turn clockwise until the valve lets out some water through the overflow
pipe. If a safety valve does not work properly, it must be replaced. Contact your installer.
The safety valve in the water tank protects the enclosed heater against over pressure in the water tank. It is mounted on the cold water
inlet line, its outlet opening is facing downwards.
The safety valve lets out small amounts of water when the water tank is being charged, especially if a lot of hot water was used previous-
ly. This is a normal behaviour.
The opening pressure of the safety valves is not adjustable.
8.4

Cleaning strainer

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4
1
1. Shut off tap
2. Cover
3. Strainer
4. O-ring
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DHP-AT
If the safety valves are not checked regularly, the water tank might be damaged.
The heat pump must be switched off at the external main switch before cleaning can be started.
The strainer must be cleaned twice a year after installation. The interval can be extended if there is evidence
that cleaning twice a year is not necessary.
Have a cloth at hand when opening the strainer cover as a small amount of water usually escapes.
Clean the strainer as follows:
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2
1. Switch off the heat pump.
2. For the heat circuit strainer - remove the insulation around the filler valve.
3. Turn the shut-off taps to the closed position (see figure).
4. Unscrew the cover and remove it.
5. Remove the strainer.
6. Rinse the strainer.
7. Reinstall the strainer.
8. Check that the o-ring on the cover is not damaged.
9. Screw the cover back into place.
10. Turn the shut-off tap to the open position.
11. For the heat circuit strainer - reinstall the insulation around the filler valve.
12. Start the heat pump.
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