8
Id.Nr.: 234660-8
•
GB
10. Domestic hot water connection (pressure-resistant)
All warranty for our hot water heaters will be invalidated in the event of the use of unsuitable or non-
functioning storage tank connection fittings and any exceeding of the stated operating pressure.
All hot water heaters which display the rated pressure 6 bar (atm or kp/cm2)on the rating plate are
pressure-resistant storage tanks and can be connected up so that they are pressure-resistant with a
line pressure of up to 5.5 bar (atm).
Should the line pressure exceed this level, a pressure reduction
valve must be installed in the cold water line.
The water connection may only be made via a tested diaphragm safety valve or a diagrams safety valve
combination –connection fitting!
A safety valve combination should consist of shut-off, testing, return, drainage and safety valve with ex-
pansion water discharge and is to be installed between the cold water supply line and cold water intake
(blue) of the storage tank in the designated sequence.
Basically the following items are to be observed:
In order to be able to guarantee the perfect functioning of the connection fittings, these should only be
mounted in rooms that are protected against frost. The discharge from the safety valve must be open
and be able to be monitored in particular the discharge line from the drip pan (expansion water funnel)
may not be channelled into the open air, so that neither frost nor being blocked up with dirt or something
similar can be the cause of a breakdown.
Care should also be taken to ensure that the outlet pipe from the safety valve is installed so that it is per-
manently sloping downwards. The discharge openings of the safety valves (domestic water and heating
circuits) must open out into an appropriate drainage object in order to avoid any damage caused by the
escape of operating fluid.
No shut-off valve or any other restriction may be installed between the safety valve and the cold water
intake. The safety valve must be set at an appropriate pressure, which is less than the rated pressure (6
bar) of the storage tank. Prior to finally connecting up the storage tank the cold water supply line must
be flushed through.
After completing the water connection and the bubble-free filling of the storage tank, the connecting
fixtures are to be tested to check their correct operation.
a) In order to prevent any blocking of the lifting device of the safety valve as a result of lime-scale de-
posits, the lifting device of the safety valve should be actuated from time to time during the operation
of the equipment.. A check should be made as to whether the valve closes up again after the lifting
device has been released and whether the water that is present flows out completely through the
funnel or discharge pipe.
b) Should safety valves be built in upstream of the water heaters, a check should be made as to whether
the safety valve reacts when the water heater heats up.. This can be ascertained from the outflow of
water from the discharge pipe.
