Checking The Water Level In The Heating System; Checking The Safety Valve - Danfoss DHP-AL User Manual

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
visible in the expansion tank.
For DHP-AL with pressurized brine circuit the manometer on the expansion tank must show
approx. 1.0 bar, see figure in section "Installation principle" for more information about the
location of the expansion tank.
Always call your installer to refill brine, see the "References" section.
6 .3

Checking the water level in the heating system

The line pressure of the installation must be checked once a month. The external manom-
eter 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
expansion tank). See the "Piping installation (principle solution)" section for information on
where the manometer is located.
You can use normal tap water 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, see the "References" section.
⚠ ⚠ ⚠
Do not use any additives for water treatment in the heating system's water!
6 .4

Checking the safety valve

Both the safety valves for the heating system must be checked at least four times a year to
prevent lime deposits clogging the mechanism. See the "Installation principle" section for
information on where the safety valves are located.
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.
Danfoss – 30
Level too low
Figure 14: Level in expansion tank .
VUBMF102
Level correct