Drazice OKC 160 NTR / BP Manuale di funzionamento e installazione - Pagina 10

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system. No stop valves can be put between the appliance and the safety valve. During

assembly, follow the guide provided by the safety equipment manufacturer.

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

the appliance. 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 appliance

draining and hot water penetrating back into the water main.

Required pressures - Table 4. We recommend that the hot water distribution from the appliance was as

short as possible to minimise heat losses.

SAFETY VALVE STARTING

PRESSURE (MPa)

0,6

0,7

Table 4

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

appliance for potential disassembly or repair.

ACCEPTABLE OPERATING OVER-PRESSURE

OF THE APPLIANCE (MPa)

0,6

0,7

Figure 1

MAX COLD WATER

PRESSURE IN PIPING (MPa)

up to 0.48

up to 0.56

up to 0.8

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

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