hajdu HB300C Manuel De Mise En Service, D'opération Et D'entretien page 60

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MV - Hot water
E - Electric heating
HB - Heating agent inlet from heat
exchanger or external heat
exchanger (in case of type HB300C)
HK - Heating agent outlet from heat
exchanger or external heat
exchanger (in case of type HB300C)
C - Circulation pipe branch
KK - Condensation outlet
The combined safety valve must be connected to the cold water branch
considering the flow direction indicated by the arrow. The maximum distance between
the appliance and the valve is 2 m, and two bends (arc, knee) are permitted. . The
appliance has to be equipped with safety valve controlled for an operation pressure of
max. 7 bar. The safety valve has to be mounted directly before the tank onto the cold
water pipe branch, in a frost-free environment. The drainage pipe has to be connected
to the safety valve in a way that it is always directed downwards and located in a frost-
free environment. The feeding pressure of incoming cold water must not exceed 5.25
bar pressure in case of valve with operation pressure of 7 bar. In case of valve with
lower pressure values, maximal feeding pressure has to be defined concerning mini-
maxi tolerance limits of the safety valve. If it exceeds this value, pressure reduction
device should be connected in front of the safety valve.
The safety valve is not an accessory of the appliance.
IT IS FORBIDDEN TO BUILD WATER PIPELINE FITTING BETWEEN THE VALVE
Before mounting the valve, the cold water pipeline must be flushed thoroughly,
in order to avoid any damage caused by any possible pollution. The combined safety
valve contains a one-way valve. Therefore, it is not needed to mount a separate one-
way valve. During the heating, the expanding water has to leak through the drainage
pipe branch of the combined safety valve. During installation of the valve, one should
pay attention to ensure that this leaking remains visible.
IT IS FORBIDDEN TO CLOSE THE DRAINAGE PIPE BRANCH OR TO DIVERT
If the pipeline system pressure exceeds the value of 0.6 MPa – only in a
temporary way -, a pressure reduction valve has to be mounted in front of the hot water
tank, at the location of item
No. 3 as described in Figure 7.3.-1. In case of lacking pressure reduction valve, the
safety valve will leak besides heating under this pressure. It is the task of the user to
purchase and mount the pressure reduction valve. If the combined safety valve is
connected to the hot water tank without the reducing device, in order to discharge the
hot water tank, a discharge faucet or valve should be mounted to the cold water pipe
of the appliance, adding a standard T-shaped fitting. It is the task of the user to
purchase the valve (faucet). An arbitrary number of taps and mixing faucets can be
mounted on the hot water tank. It is rational to block the flow back of the hot water
through the outlet towards the cold water pipeline system by mounting a one-way valve
AND THE APPLIANCE.
WATER LEAKING IN A NON-VISIBLE WAY.
1 - Closing valve
2 - Manometer
3 - Pressure reducing valve
(only above water pipeline
pressure above 0,6 MPa)
4. - Y filter
5 - Combined safety valve
6 - Drain outlet (into sewage
system)
7 - Discharge valve
8 - Faucet (with shower)
9 - Faucet
10 - One-way valve