Gorenje TCM 200 - 300 Instrucciones De Uso página 18

CONNECTION TO WATER SUPPLY MAINS
Connect the water pipeline system according to the attachment signs from the previous chapter (Fig. 1).
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 nominal pressure. The outflow nozzle on the safety valve must have an outlet into the
atmosphere. To assure correct operation of the safety valve, check the valve regularly and, if necessary, remove the limescale and
check that the safety valve is not blocked. 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 storage tank is increased up to the level present
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 inlet pipe of the hot water storage tank. The volume of the expansion vessel must be ca. 5% of the hot
water tank volume.
The hot water storage tank is designed for connection to indoor water supply mains without using the relief valve if the pressure in the
supply mains is lower than prescribed on the appliance. 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.
Fig. 4: Closed pressure system
To avoid damage to the heat pump power unit, the heat pump water heater must not operate without any water in the tank!
18
LEGEND
1 Stop valve
2 Pressure reduction valve
3 Safety non-return valve
4 Expansion tank
5 Drain valve
6 Flexible hose
H Cold water
T Hot water