Putting Out Of Service, Discharge - Dražice OKC 300 NTR/1MPa Operation And Installation Manual

Procedure:
1. Check both water and electric installation; for combined heaters, check the installation to a hot
water heating system. Check proper placement of operating and safety thermostat sensors. The
sensors must be inserted all the way in; first the operating and then the safety thermostat.
2. Open the hot water valve on the combination faucet.
3. Open the cold water inlet valve to the heater.
4. As soon as the water starts running through the hot water valve, the heater is filled and the valve
closes.
5. In case of a leakage (flange lid), we recommend fastening the flange lid bolts.
6. Fasten the electric installation cover.
7. In case of service water heating by electric energy, turn on the electricity (for combined heaters,
the heating water valve at the heating water entry to heating insert must be closed).
8. When heating service water with electric energy from the hot water heating system, turn the
electricity off and open the valves of heating water input and output, possibly de-aerate the
exchanger.
9. When commencing operation, flush the heater until the cloudiness in the water is gone.
10. Make sure to fill in properly the warranty certificate.

2.6 PUTTING OUT OF SERVICE, DISCHARGE

If the hot water heater 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 hot water heater 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 (water can be also drained
through safety valve; for that purpose, the safety valve is turned to the "Check" position).
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 hot water heater and in the hot water piping may get frozen
but also the water in the entire cold water supply piping. It is therefore advisable to drain all
fittings and piping that carry water, up to the part where the house water meter is installed
(connection of the house to water main) which is not jeopardised by frost. When the tank is
put in service again, it has to be ensured that it is filled with water and the water flowing
out at the hot water valves is free of bubbles.
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