Drazice OKH 100 NTR/HV Manuale operativo e di installazione - Pagina 10

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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 regular operation, such a check needs to be carried

out at least once a month, and after each shutdown of the tank longer 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

tank, use the recommended drain valve. First of all, close water inlet in the tank. Find

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

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

of the tank and hot water penetration back into the water main.

Required pressures - Table 2 - We recommend that the hot water distribution from the tank is as short as

possible in order to reduce heat losses

SAFETY VALVE STARTING

PRESSURE (MPa)

Table 2

Connection of tank exchanger (left, right) and fixture armature at cold water inlet.

Figure 5

ACCEPTABLE OPERATING OVER-

PRESSURE OF THE TANK (MPa)

0,6

0,7

O - bleeder valve

U - shutoff valve

P1 - Safety valve with backflow flap

P2 - safety valve for heating circuit

M - Manometer

Z – Test valve

V - Drain valve

Connection on cold water inlet must comply with the

standard effective in the country of installation.

MAX COLD WATER

PRESSURE IN PIPING

0,6

0,7

(MPa)

up to 0.48

up to 0.56

up to 0.8

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