31
CONNECTION TO THE WATER SUPPLY
Before connecting the hot water tank, install the protective covering. Take off the top cover
and insert the covering, make sure the slots on the covering match the connections on the
hot water tank. Zip the zipper from top to bottom and tighten the tapes on the top edge of the
covering. Replace the top cover. Insert the thermometer into the prefabricated sleeve on the
front of the hot water tank; make sure to cut the opening for the sleeve into the covering. The
connection to water supply network and fastening of the coloured rosettes shall be made
according to the markings defined in previous Section.
For safety reasons the supply pipe must be fitted with a return safety valve that prevents the
pressure in the tank from exceeding nominal pressure by more than 0.1 MPa. The heating of
water in the heater causes the pressure in the tank to increase to the level set by the safety
valve. As the water cannot return to the water supply system, this can result in dripping from
the outflow of the safety valve. The drip can be piped into the drain by installing a catching
unit just below the safety valve. The drainpipe fitted under the safety valve outflow must be
piped down in a straight vertical line and located in an environment free from the onset of
freezing conditions.
In case the existing plumbing does not enable you to pipe the dripping water from the return
safety valve into the drain, you can avoid the dripping by installing expansion tank on the
inlet water pipe of the boiler. The volume of the expansion vessel shall be at least 3% of the
volume of the hot water tank.
Key:
1. Return safety valve
2. Test valve
3. Non-return valve
4. Pressure-reducing valve
5. Stop valve
6. Test unit
7. Funnel outlet to the drain
8. Drain valve
H - Cold water
T - Hot water
The water heater may be connected to the household water supply system without a
pressure-reducing valve provided the supply mains pressure is less than 0.5 MPa.
In case of the mains pressure exceeding 0.5 MPa, a pressure-reducing valve must be
installed to ensure that the pressure on the supply side of the heater does not rise above the
nominal value.
GB
Summary of Contents for KGV 200-1
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