Heat pumps AIR / WATER
Operation manual
38
5.3
Operation control
During the operation of the heat pump, a regular check of the alarm indicator is necessary in
order to quickly eliminate any possible error and minimize the operation of auxiliary heaters
(bivalent heater), as at most alarms these heat sources will be triggered in case of low room
temperature.
5.4
Pressure control in the heating system
At least once a month it is necessary to check the pressure in the piping of the
installation. The external pressure gauge shall show a value between 1 and 1.5
bar. If the value is less than 0.8 bar, top up the water in the heating system.
Common tap water can be used to refill the heating system. In exceptional cases, tap water is
unsuitable for refilling the heating system - e.g. very hard water with too much mineral content.
If you are not sure, refer to the installation technician, see chap. 8 Links.
Do not add any additives to the water in the heating systems
In a closed expansion vessel there is a pouch filled with air, which
compensates for the variations in the volume of water in the heating
system. This pouch must not be drained under any circumstances!
The system is fitted with a safety valve. Each safety valve shall be periodically
checked for functionality at least once every six months (by manual draining of
water) and replaced in the event of a malfunction. Caution - hot water may leak
from the valve. The container supplier shall not be liable for defects caused by
the malfunction of the safety valve.
5.4.1
System and expansion vessel pressure control procedure
When draining water from the expansion tank, keep a large enough container at
hand, more water may leak (depending on the size of the expansion tank).