6.2 Check the water level in the heating circuit
The line pressure of the installation must be checked once a month. The external manometer must show a val-
ue between 0.8-1.5 bar, depending on the system's requirements. 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 expansion tank).
Normal tap water can be used when topping up the heating system. In certain exceptional cases the water
quality may be so poor (for example very hard water) that it is not suitable for filling the heating system.
If unsure, contact your installer.
The closed expansion tank contains an air fil-
led bladder that absorbs variations in the
heating system’s volume. Under no circum-
stances may it be drained of air.
6.3 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 previously.
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.
6.4
In the event of leakage
In the event of leakage in the hot water pipes between the heat pump and water taps, close the shut-off valve
on the cold water inlet immediately. Then contact your installer.
User Guide
iTec
VUJSI102 Thermia Värmepumpar
24
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