Drazice OKC 160 NTR / BP Manuale operativo e di installazione - Pagina 11

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It is necessary to check the safety valve each time before putting it into operation. It is

checked by manual moving of the membrane from the seat, turning the make-and-break

device button always in the direction of the arrow. After being turned, the button must click

back into a notch. Proper function of the make-and-break device results in water draining

through the safety valve outlet pipe. In common operation, such a check needs to be

implemented at least once a month, and after each heater shutdown for more than 5 days.

Water may be dripping off the drain pipe of the safety valve; the pipe must be open into the

air, pointed down; environment temperatures must not drop below zero. When draining the

heater, use the recommended drain valve. First, close the water supply into the heater. Find

necessary pressure values in the following table. For proper safety valve operation, a

backflow valve must be mounted on the inlet pipes, preventing spontaneous heater draining

and hot water penetrating back into the water main.

Required pressures – Table 4. We recommend that the hot water distribution from the tank was as short as

possible to minimise heat losses.

SAFETY VALVE STARTING

PRESSURE (MPa)

0,6

0,7

Table 4

Water heaters must be provided with a discharge valve mounted on the cold service water inlet to the

heater for potential disassembly or repair.

ACCEPTABLE OPERATING OVER-PRESSURE

OF THE WATER HEATER (MPa)

0,6

0,7

Figure 3

MAX COLD WATER

PRESSURE IN PIPING (MPa)

up to 0.48

up to 0.56

up to 0.8

O - bleeder valve

U - stop valve

P1 – safety valve with reverse flap

P2 - safety valve for heating circuit

M – manometer

Z - test valve

V - drain valve

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