- 17 -
Before putting the safety valve into operation it always needs to be checked by manual
removal of the membrane from the valve seat and 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 can drip
from the safety valve through the drain pipe; the pipe must be freely open to the
atmosphere, placed vertically and shall be in an environment free of temperatures below
freezing. When draining the heater, use a recommended drain valve. First, close water
supply into the heater.
Please find necessary pressure values in the table (Table 10). For proper safety valve operation, a backflow
valve must be mounted on the input pipes, preventing spontaneous heater draining and hot water
penetrating back into the water main. We recommend that the hot water distribution from the heater was
as short as possible to minimise heat losses. At least one demountable joint must be mounted between the
tank and every supply pipe. Adequate piping and fittings with sufficiently dimensioned maximum
temperature and pressure values must be used.
Heaters must be provided with a discharge valve
mounted on the cold service water inlet to the
heater for potential disassembly or repair.
When assembling the security equipment, follow
the standard.
SAFETY VALVE
STARTING
PRESSURE
[MPa]
ADMISSIBLE
OPERATING
WATER
HEATER
PRESSURE
[MPa]
MAX
PRESSURE IN
THE COLD
WATER PIPE
[MPa]
0,6
0,6
up to 0.48
0,7
0,7
up to 0.56
1
1
up to 0.8
Table 10
2.4
FURTHER INFORMATION
300-1000 litre capacity heaters are screwed onto the bottom wooden palette with M12
screws. When the heater is released from the palette and prior to its putting into operation,
3 adjustable legs supplied as the product accessories have to be installed. With these legs,
the heater may be positioned vertically to the base, within 10 mm.