hajdu HP-TOWER HPT200 Manuel De Mise En Service, D'opération Et D'entretien page 69

The combined safety valve must be connected to the cold water branch observing the
flow direction indicated by the arrow. The maximum distance between the appliance
and the valve is 2 m, and two bends (arcs knees) are permitted.
The appliance has to be installed with the safety valve regulated at an operation pres-
sure of max. 7 bar. The safety valve must be mounted directly in front of the tank, on
the cold water pipe branch, in a frost-free environment. The drainage pipe has to be
connected to the safety valve, in such way that it is always directed downwards and lo-
cated in a frost-free environment. In case of a valve with 7 bar operating pressure, the
feed pressure of incoming cold water may not exceed 5.25 bar. If the valve pressure is
lower, the maximum feed pressure has to be defined observing the min-max tolerance
limits of the safety valve. If it exceeds this value, a pressure reducer should be inserted
in front of the safety valve.
The safety valve is not included in the accessories of the appliance.
IT IS FORBIDDEN TO INSERT WATER PIPELINE FITTINGS
BETWEEN THE VALVE AND THE APPLIANCE.
Before installing the valve, the cold water pipeline must be carefully flushed, in order to
avoid damages due to possible contaminations. The combined safety valve contains a
one-way valve. Therefore, it is not necessary to mount a separate one-way valve. During
heat-up, the expanding water has to leak through the drainage pipe branch of the com-
bined safety valve. When installing the valve, make sure that this leaking remains visible.
IT IS FORBIDDEN TO CLOSE THE DRAINAGE PIPE BRANCH OR
TO DIVERT WATER LEAKAGE IN A NON-VISIBLE WAY.
The water may drip from the discharge pipe of the pressure-relief device and that pipe
must be left open to the atmosphere.
If the pressure of the pipeline exceeds 0.6 MPa, even on a temporary basis, a pres-
sure reduction valve has to be mounted in front of the hot water tank at the location
of item No. 3 in Figure 2.5.-1. If there is no pressure reduction valve present, the safety
valve will leak under pressure outside the heating cycle too. It is the user's duty to pur-
chase and install the pressure reduction valve. If the combined safety valve is not di-
rectly connected to the hot water tank using the reducer, a discharge faucet or valve
should be mounted on the cold water pipe of the appliance (directly in front of it) along
with the insertion of a standard T fitting, in order to enable the drainage of the hot wa-
ter tank. It is the user's duty to purchase the valve (faucet). Any number of taps and fau-
cets can be mounted on the hot water container. To block the back-flow of hot water
through the outlet towards the cold water pipeline, it is recommended to insert a one-
way valve in the cold water pipe in front of the taps. A closing valve needs to be instal-
led in the cold water pipeline leading to the container, in front of the fittings (combined
safety valve, one-way valve, etc.). This closing valve enables to disconnect the hot water
tank and the water pipeline fittings from the water supply system (in case of a failure or
other maintenance work).
17