2.6 FIRST COMMISSIONING
After connecting the appliance to the water supply, the hot water heating system, the
electric network, and after testing its safety valve (based on the valve manual attached), the
appliance may be put into operation. Before opening the power supply, the appliance must
be filled with water. The process of first heating must be executed by licensed professional
who has to check it. Both the hot water outlet pipe and safety armature parts may be hot.
During the heating process the pressurised connection water that increases its volume due
to heating must drip off the safety valve. In non-pressurised connection water drips off the
overflow combination faucet. When heating is finished, the set temperature and the actual
temperature of consumed water should be roughly equal. After connecting the appliance to
the water main and electrical power system, and after checking the safety valve (following
the instructions attached to the valve), the appliance can be put into operation.
Procedure of putting the appliance into operation:
1. Check both water and electric installation; for combined heaters, check also the installation
to the hot water heating system. Check proper placement of thermostat sensors; The sensors
must be inserted all the way in; first the thermostat and then the safety fuse.
2. Open the hot water valve on the combination faucet.
3. Open the cold water inlet valve to the appliance.
4. As soon as the water starts running through the hot water valve, the appliance is filled and the
valve can be closed.
5. In case of a leakage (flange lid), we recommend fastening the flange lid bolts.
6. Screw down the electric installation guard.
7. When heating service water with electric energy from the hot water heating system, open the
heating water inlet and outlet valves, possibly de-aerate the heat exchanger.
8. When commencing operation, flush the appliance until the cloudiness in the water is gone.
9. Make sure to fill in properly the warranty certificate.
2.7 PUTTING OUT OF SERVICE, DISCHARGE
If the appliance is put out of service for a longer time, or if it is not going to be used it has to
be drained and disconnected from the electric supply network on all poles. The switch for
the supply lead or the fuse cut-outs have to be shut off.
At places with permanent risk of frost the appliance must be drained before the cold season
starts if the appliance remains out of service for several days and if the power supply is
disconnected.
Drainage of service water shall be performed after closing the shut-off valve in the cold
water supply piping (through the discharge valve for safety valve combination), and with
simultaneous opening of all hot water valves of connected fittings. Hot water may outflow
during the drainage! If there is a risk of frost it has to be considered that not only the water
in the appliance and in the hot water piping may get frozen but also the water in the entire
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