Check The Water Level In The Heating Circuit; Checking Safety Valves - Danfoss DHP-AT User Manual

User Guide
Error code Description
22 Cooling coil sensor (T6) failure
23 Exceeded operation range warning (non-fault)
8.2

Check the water level in the heating circuit

The line pressure of the installation must be checked once a month.
The external manometer (if available) must show a value between 1-1.5 bar. If the value is below 0.8 bar, when
the water in the heating system is cold, the water must be topped up (applies in the event of an empty expan-
sion tank).
Ordinary tap water can be used when topping up the heating system. In certain exceptional cases, the water
quality may be poor (for example very hard water) and is not suitable for filling the heating system. If unsure,
contact your installer.
N
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 wa-
ter through the overflow pipe. If a safety valve does not work properly, it must be replaced. Contact your instal-
ler.
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 previously. This is a normal behaviour.
The opening pressure of the safety valves is not adjustable.
22
DHP-AT
The closed expansion tank contains an air filled bladder that absorbs variations in
the heating system's volume. Under no circumstances may it be drained of air.
If the safety valves are not checked regularly, the water tank might be damaged.
VUGFC302 Danfoss Heating Solutions