Dražice OKC 200 NTRR / BP Operation And Installation Manual - Page 11

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appliance and the safety valve. During the 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 to the right. 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 a recommended drain valve. First, close water input 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. We recommend that the hot water distribution

from the appliance was as short as possible to minimise heat losses.

Required pressures - Table 3. 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 3

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

appliance for potential disassembly or repair.

ADMISSIBLE OPERATING OVER-

PRESSURE OF APPLIANCE (MPa)

0,6

0,7

MAXIMUM PRESSURE IN COLD

WATER PIPES (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

Figure 3

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