Dražice OKC 200 SOL 작동 및 설치 매뉴얼 - 페이지 15

{카테고리_이름} Dražice OKC 200 SOL에 대한 작동 및 설치 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Dražice OKC 200 SOL 19 페이지. Water heaters for solar systems

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2.3 PLUMBING FIXTURE

Each hot service water pressure heater must have a membrane spring loaded with a safety

valve. Nominal clearance of safety valves is defined by standard. Heaters are not equipped

with a safety valve. The safety valve must be easily accessible, as close to the heater as

possible. The inlet pipes must have at least the same clearance as the safety valve. The

safety valve is placed high enough to secure dripping water drain by gravity. We recommend

mounting the safety valve onto a branch pipe. This allows easier exchange without having to

drain the water from the heater. Safety valves with fixed pressure settings from the

manufacturer are used for the assembly. Starting pressure of a safety valve must be identical

to the maximum allowed heater pressure and at least 20 % higher than the maximum

pressure in the water main (Table 3). If the water main pressure exceeds such value, a

reduction valve must be added to the system. No stop valves can be put between the heater

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 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 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.

Please find necessary pressure values in the below Table 3. For proper safety valve operation, a backflow

valve must be mounted on the inlets 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

Table 4

ALLOWABLE

SAFETY VALVE

OPERATING

START-UP

OVERPRESSURE

PRESSURE

OF WATER

[MPa]

HEATER [MPa]

0,6

0,7

MAXIMUM

PRESSURE IN

COLD WATER

PIPES [MPa]

0,6

up to 0, 4 8

0,7

up to 0,56

up to 0,8

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