Checking Safety Valves - Danfoss DHP-A User Manual

The brine must be topped up when the level drops so that it is no lon-
ger visible in the expansion tank.
1
Figure 1.
During the first month of operation the brine level might drop a little,
which is quite normal. The fluid level may also vary depending on the
temperature of the heat source. Under no circumstances, however,
must the fluid level be allowed to drop so much that it is no longer visi-
ble in the expansion tank.
For DHP-A with pressurized brine circuit the manometer on the expan-
sion tank must show approx. 1.0 bar.
Always call your installer for refilling of refrigerant.
6.4

Checking safety valves

Both the safety valves for the installation must be checked at least four
times a year to prevent lime deposits clogging the mechanism.
The safety valve of 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 facing downwards. If the safety valve is not
checked regularly, the water tank might be damaged. It is quite normal
that 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 previ-
ously.
Both safety valves can be 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 opening pressure of the safety valves is not adjustable.
Symbol explanation
2
1
2
Level, brine
Correct level
Level too low
User manual VUBMA902 – 23