Dražice OKC 200 NTR/BP Betriebs- und Installationshandbuch - Seite 6
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8.
CONNECTION OF COMBINED HEATER TO HOT WATER HEATING SYSTEM
(Fig. 1, 2)
It is recommended to install stop valves on the heating water inlet and outlet (for possible dismantling of
the heater).
The valves have to be as close to the heater as possible to avoid higher thermal losses.
9.
ELECTRIC INSTALLATION
The electric wiring scheme is attached to the water heater on the side of the electric installation guard (see also Fig.
6).
Connection, repairs, and wiring inspections may only be implemented by a company authorised to such activity.
Expert connection must be confirmed on the warranty certificate.
The heater is connected to the 230 V/50 Hz electric network using a fixed moving conductor with a switch that
turns off all network poles and the circuit breaker (protector).
Installations in bathrooms, laundromats, rest rooms, and showers, 33 2000-7-701 must be obeyed.
The degree of protection of electric parts of the heater is IP 45.
Respect the rules of protection against electrical injuries in accordance with ČSN 33 2000–4-41.
10.
PUTTING THE HEATER INTO OPERATION
After connecting a heater to the water main, hot water heating system, electric network, and after testing its safety
valve (based on the valve manual attached), the heater may be put into operation.
Procedure:
a)
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.
b)
Open the hot water valve on the combination faucet;
c)
Open the cold water inlet valve to the heater.
d)
As soon as the water starts running through the hot water valve, the heater is filled and the valve closes.
e)
In case of a leakage (flange lid), we recommend fastening the flange lid bolts and screwing the electric
wiring guard.
f)
Fasten the electric installation cover.
g)
When heating service water with electric energy, turn the electricity on (in combined versions, the valve on
the heating water inlet into the heating element has to be shut off);
h)
When heating service water with thermal energy from a hot water heating system switch electricity off and
open the valves of heating water inlet and outlet, possibly de-aerate the exchanger.
i)
When commencing operation, flush the heater until the cloudiness in the water is gone.
j)
Make sure to fill in properly the warranty certificate.
11.
HEATER CLEANING AND ANODE ROD EXCHANGE
Repetitive water heating causes limestone sediment on both the tank walls and chiefly the flange lid.
The sedimentation depends on the hardness of water heated, its temperature, and amount of hot water consumed.
We recommend checking and cleaning the tank from scale and eventual replacement of the anode rod after
two years of operation. The anode life is theoretically calculated for two years of operation; however, it changes
with water hardness and chemical composition in the place of use. Based on such an inspection, the next term of
anode rod exchange may be determined. Have the company in charge of service affairs clean and exchange the
anode. When draining water from the heater, the combination faucet valve for hot water must be open, preventing
occurrence of under-pressure in the heater tank which would stop the water from draining.
12.
IMPORTANT NOTICES
Without a confirmation of performed electrical installation issued by an authorised company, the
warranty certificate shall be void.
Check and exchange the Mg anode regularly.
You have to apply for approval of a local power supplier to connect the heater.
No stop valves can be put between the heater and the safety valve.
6