Austria Email VT-S 800-FRM Manuale di istruzioni per il funzionamento e il montaggio - Pagina 5
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4. Service Water Connection
Pressure-proof connection
Any warranty for our water heaters shall be rejected in case of use of unsuitable or inoperative tank con-
nector fittings as well as any exceedance of the specified operating pressure.
All water heaters of the series VT-N are provided with a rating plate bearing the designation 6 bar, those
of the series VT-S are designated 10 bar. These are pressure-proof tanks that are connected applying a
line pressure up to the height specified. A pressure reducing valve must be installed in the cold water
supply line, should the line pressure be higher. The water plumbing must be performed by means of
a certified diaphragm safety valve or a diaphragm safety valve combination (connector fitting for pressure-
proof storage tanks) only! A safety valve combination consists of a shutoff, test, swing check, drain and
safety valve with an expansion water drip and is installed between the cold water supply line and the cold
water supply of the storage tank in the order as drawn.
Principally, the following must be observed:
In order to ensure a flawless function of the connector fitting, the same must be mounted in frost-pro-
tected rooms only. The drain of the safety valve must be open and observable or the outlet pipe from the
drop collector (expansion water funnel) must lead into the sewer, so that neither frost nor clogging by dirt
or anything similar may cause any malfunction. Furthermore it must be observed that the drain pipe of the
safety valve be installed with a continuous downward inclination.
No shutoff valve or other throttling must be installed between the safety valve and the cold water supply of
the storage tank.
The safety valve must be set to a response pressure that is below the pressure rating of the tank. The cold
water supply line must be rinsed out before the tank is finally connected. After completed plumbing and
bubble-free filling of the tank, the connector fitting must be checked for functionality.
a)
In order to avoid a blockage of the airing facility of the safety valve due to furring, the airing facility of
the safety valve must be operated from time to time during operation of the system. It must be obser-
ved whether the valve closes again after releasing the airing facility and whether the water in place
runs off completely through the funnel or the blow-off pipe.
b) In the case of safety valves that are installed ahead of water heaters, it must be observed whether
the safety valve responds during heating of the water heater. This is identifiable by the penetration of
water out of the blow-off pipe.
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Id.Nr.: 233754-4