Drazice OKC 125 NTR Operation And Installation Manual - Page 9

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2.3 PLUMBING FIXTURE

Connection of heaters to plumbing fixtures is illustrated on (figure 4, figure 6).

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.

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

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.

If the water main pressure exceeds such value, a reduction valve must be added to the

Figure 2

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