2.3 PLUMBING FIXTURE
Connection of heaters to plumbing fixtures is illustrated on Figure 4 and Figure 6. For
potential disconnection of the heater, the service water inlets and outlets must be provided
with screw coupling Js 3/4". Safety valve is mounted on the cold water inlet identified with a
blue ring.
Each hot service water pressure heater must have a membrane spring loaded with a safety
valve. The safety valve must be easily accessible, as close to the heater as possible. The input
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. 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 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 drain valve. You must first close the water supply
to the heater.
Figure 3
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