Plumbing Fixture - Drazice OKHE 80-SMART Operating And Installation Manual

If the hot water heater is mounted in a tight, small space, or in an intermediate ceiling, etc.,
you have to make sure that the connecting side of the appliance (connections to water
supply, area for electric plugging) remained accessible and no heat accumulation occurs.
Free space of up to 500 mm from the bottom edge of the heater has to be available under
the heater. When mounted directly under the ceiling, the distance from the ceiling has to be
50 mm at least.
If the water heater is mounted in enclosed areas, inter-ceilings, built-in structures and
recesses, ensure sufficient access to service fittings, electrical terminal boards, anodes and
manholes. Minimum spacing from manhole is 600 mm.

2.3 PLUMBING FIXTURE

Power water connects to pipes with G ¾" thread in the bottom part of the heater. Blue - cold
water supply, red - hot water outlet. For potential disconnection of the heater, the service
water inlets and outlets must be provided with screw coupling G 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.
Nominal clearance of safety valves is defined by CSN 0 60830 standard. The 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 valves with fixed pressure settings from the manufacturer are used for the assembly.
Starting pressure of a safety valve must be identical with the maximum allowed heater
pressure, and at least 20% higher than the maximum pressure in the water main - see Table
4. 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.
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.
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