The PCD is optionally mounted on an electric cord of the device to disconnect the EWH
from the power network in the case of power supply voltage current leakage or break-down in
respect of the grounded components of the device.
4.3. The safety valve is acting as a return valve, preventing the ingress of water from the water
heater into a water supply system when a pressure decreases in this system and when a pressure
increases in the tank at a vigorous heating of the water, and it may also act as a safety valve to
relieve excessive pressure in the tank at a vigorous heating of the water. When the water heater is
in operation, water may seep out of the outlet pipe of the safety valve to relieve excessive
pressure, which is to ensure safety of the water heater. This outlet pipe should remain open to the
atmosphere and always held in the down position, especially in non-freezing surroundings. Make
provisions in the EWH installation for water drainage from the outlet pipe of the safety valve to a
sewer system.
It is necessary, on a regular basis (at least once a month), to drain a small amount of
water through the outlet pipe of the safety valve to a sewer system to remove lime residues and
to verify that the valve is in good working order. To open the valve it is provided with a handle.
Take care that when the water heater is in operation this handle is in a position closing the
discharge of water from the tank.
5. SFETY PRECAUTIONS
5.1. The EWH electric safety can be guaranteed only if there is an effective grounding made in
accordance with the standing wiring rules for electrical installations.
5.2. Layout of plumbing fittings and shutoff valves must comply with parameters of a water-
supply line and have necessary certificates of quality.
5.3. In installation and operation of the EWH, you should never:
- connect power to the EWH, if it is not filled with water;
- remove the protective cover with the power “ON”;
- use the EWH without grounding;
- connect the EWH to the water-supply line under a pressure of over 0.6 MPa;
- connect the EWH to the water-supply line without safety valve;
- drain water from the EWH with the power “ON”;
- use spare parts that are not recommended by the Manufacturer;
- use water from the EWH for cooking;
- use water containing mechanical impurities (sand, small stones) that are apt to disorder the
normal operation of the EWH and safety valve.
- change the design and mounting dimensions of the EWH brackets.
6. INSTALLATION AND CONNECTION
WARNING!
All the plumbing and electrical work should be carried out by qualified personnel necessarily
making records in Section on “Connection Note” (see Section on “Manufacturer’s Warranties”.)
