Gorenje TC80Z Mode D'emploi page 13

CONNECTION TO WATER SUPPLY MAINS
Water inlet and outlet on the heat pump are marked with colours. Cold water inlet is
marked with blue, and warm water outlet is marked with red. The heat pump is designed
for connection to indoor water supply mains without using the relief valve if the pressure in
the supply mains is lower than 0.6 MPa (6 bar). If the pressure is higher, a relief valve
needs to be installed so as to provide that the pressure at the inlet to the hot water tank
does not exceed the nominal pressure.
Installing a safety valve is mandatory in order to assure safe operation. The valve prevents
an increase of the pressure in the boiler by any more than 0.1 MPa (1 bar) above the rated
pressure. The outflow nozzle on the safety valve must have an outlet into the atmosphere.
To assure correct operation of the safety valve, the valve must be regularly checked.
When checking the valve, push the lever or unscrew the nut of the valve (depending on the
type of the valve) and open the drain from the safety valve. Water must flow from the valve
nozzle, showing that the valve operation is faultless. During the heating of water, the water
pressure in the hot water tank is increased up to the level preset in the safety valve. Since
the system prevents backflow of water into the water supply mains, water may be dripping
from the outlet opening on the safety valve. The dripping water may be drained via trap into
the drains; the trap is mounted under the safety valve. The outlet pipe, which is mounted
under the safety valve, must be directed downwards, in a place with a temperature above
freezing.
If the installation does not allow draining of the water from the safety valve into the drains,
dripping can be avoided by installing an expansion vessel onto the heat pump inlet pipe.
The volume of the expansion vessel must be ca. 3% of the hot water tank volume.
1 2 3 4
Fig. 1: Closed (pressure) system
Legend:
1 - Pressure mixer taps
2 - Expansion tank
3 - Safety valve
a - Test valve
b - Non-return valve
4 - Funnel with outlet connection
5 - Checking fitting
a b 5 6 7
Fig. 2: Open (non-pressure) system
6 - Pressure reduction valve
7 - Closing valve
8 - Non-return valve
9 - Low pressure mixer tap
H - Cold water
T - Hot water
9 8 7
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