Drazice OKHE ONE 120 Instrukcja obsługi i instalacji - Strona 10
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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 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 heater, use the recommended
drain valve. First, close the water supply into the heater.
Find necessary pressure values in the following (table 3). For proper safety valve operation, a backflow
valve (figure 5), must be mounted on the inlet 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.
Figure 4
ALLOWABLE
SAFETY VALVE
OPERATING
START-UP
OVERPRESSURE
PRESSURE
OF WATER
[MPa]
HEATER [MPa]
0,6
0,7
1
MAXIMUM
PRESSURE IN
COLD WATER
PIPES [MPa]
0,6
up to 0.48
0,7
up to 0.56
1
up to 0.8
Table 3
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