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ウォーターヒーター Drazice OKCEV 200のPDF 操作および設置マニュアルをオンラインで閲覧またはダウンロードできます。Drazice OKCEV 200 19 ページ。 Tank-type water heaters for horizontal mounting
Drazice OKCEV 200 にも： 操作および設置マニュアル (19 ページ)
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2.3 PLUMBING FIXTURE
Connection of heaters to plumbing fixtures is illustrated on (Figure 4, Figure 5).For potential
disconnection of the heater, the service water inlets and outlets must be provided
with screw coupling Js 3/4".The safety valve is mounted on the cold water inlet identified with
a blue ring. We recommend that the hot water distribution from the heater was as short as
possible to minimise heat losses.
Each hot service water pressure heater must have a safety valve with a membrane spring.
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. 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 5).
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 assembly, follow
the guide provided by the safety equipment manufacturer. The cold water inlet of each
individually closable heater must be fitted with a seal, test tap or plug to check the non-return
valve, as well as a non-return valve and safety valve. Heaters with a volume of more than
200 litres must also be fitted with a pressure gauge.
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. For proper safety
valve operation, a backflow valve shall be mounted on the inlet pipes, preventing spontaneous
heater draining and hot water penetrating back into the water main.
Required pressures: Table 5
Table 5
SAFETY VALVE STARTING
PRESSURE (MPa)
0.6
0.7
1
ACCEPTABLE OPERATING OVER-
PRESSURE OF THE WATER
HEATER (MPa)
0.6
0.7
1
MAX COLD WATER PRESSURE IN
PIPING (MPa)
up to 0.48
up to 0.56
up to 0.8
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