Drazice OKH 125 NTR Manuale di funzionamento e installazione - Pagina 9
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Water can drip from the safety valve through the drain pipe; the pipe must be freely open to
the atmosphere, placed vertically and shall be in an environment free of temperatures below
freezing. When draining the heater, use a drain valve. You must first close the water supply
to the heater. Required pressures are in Table 2 below.. To ensure correct operation the
safety valve must be mounted on the inlet piping return valve, preventing spontaneous
heater draining and hot water penetrating back into the water main..
Required pressures - Table 2 - We recommend that the hot water distribution from the heater was as short
as possible to minimise heat losses.
SAFETY VALVE STARTING
PRESSURE (MPa)
Table 2
Connection of the heater exchanger (left, right) and fittings at the cold water inlet.
Figure 5
ADMISSIBLE OPERATING OVER-
PRESSURE OF WATER HEATER
0,6
0,7
1
O – Air outlet valve
U – Shut-off valve
P1 – Safety valve with backflow flap
P2 – Safety valve for heating circuit
M – Manometer
Z – Test valve
V – Drain valve
Connection on the cold water inlet must conform to
national standard.
MAXIMUM PRESSURE IN
COLD WATER PIPES
(MPa)
0,6
0,7
1
(MPa)
do 0,48
do 0,56
do 0,8
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