Important Notice; Putting The Heater Into Operation; Technical Data - Dražice OKC 300 NTR/1MPa Manual

3. IMPORTANT NOTICE

- Check and exchange the Mg anode regularly.
- No stop valves can be put between the heater and the safety valve.
- All hot water outputs must have a mixing battery.
- Before filling the heater with water for the first time, it is recommended to fasten the flange connection
nuts of the tank.
- It is not allowed to handle the thermostat, aside from temperature resetting with a control button.
- All electric installation handling, adjustment and replacement of the regulation elements shall only be
performed by an authorised service company.
The thermal fuse must not be turned off! In case of thermostat defect, the thermal fuse interrupts
-
electric power input to the heating element if the water temperature in the heater exceeds 90 °C.
- As an exception, the thermal fuse may also switch off due to water overheating caused by overheating
the hot water heating system boiler (in case of a combined heater).
We recommend you operate the heater with one type of energy. In case a solar system is connected
-
to the bottom exchanger, it is necessary to connect a TJ 6/4" line element in the coupling above the
heater for potential additional heating.

4. PUTTING THE HEATER INTO OPERATION

After connecting a heater to the water main, the hot water heating system, the electric network, and after testing its
safety valve (based on the valve manual attached), the heater may be put into operation.
Procedure:
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.
Open the hot water valve on the combination faucet
Open the cold water inlet valve to the heater.
As soon as the water starts running through the hot water valve, the heater is filled and the valve closes.
In case of a leakage (flange lid), we recommend fastening the flange lid bolts.
Fasten the electric installation cover.
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).
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. When commencing operation, flush
the heater until the cloudiness in the water is gone.
Make sure to fill in properly the warranty certificate.

5.TECHNICAL DATA

Chart 1
Type
Tank capacity
Diameter
Weight
Operating hot service water pressure
Operating heating water pressure
Max temperature of heating water
Max temperature of hot service water
Exchanger heat surface
Exchanger performance at temperature drop 80/60°C
Performance number accord.to DIN 4708
Permanent TUV* performance
TUV*heating time by exchanger at temperature drop 80/60°C
Heat losses
*TUV - Hot service water 45°C
OKC 300 OKC 400
NTR/1MPa NTR/1MPa
l 300
mm 670
kg 108
MPa 1
MPa 1,6
°C 110
°C 95
m2 1,5
kW 35
NL 8
l/h 1100
min 24
kWh/24h 1,86
3
OKC 500
NTR/1MPa NTR/1MPa
385 485
700 700
123 173
1 1
1,6 1,6
110 110
95 95
1,8 1,9
57 65
15,2 19,1
1395 1590
20 23
2 2,3
OKC 750 OKC 1000
NTR/1MPa
750 975
910 1010
253 337
1 1
1,6 1,6
110 110
95 95
3,7 4,5
99 110
30,5 38,8
2440 2715
24 26
3,6 3,9