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
1
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
1
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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