Drazice OKC 400 NTR/SOL Manual de operação e instalação - Página 10
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For proper safety valve operation, a backflow valve must be mounted on the inlet pipes, preventing spontaneous heater
draining and hot water penetrating back into the water main.
When assembling the security equipment, follow ČSN 06 0830.
9. PROCEDURE OF FILLING HEATER WITH WATER
1. Open the stop valve on the entry to the heater.
2. Open the hot water valve on the combination faucet. Once water starts flowing out through the combination
faucet the filling is completed and the faucet shuts off.
3. Check the joints for tightness.
10. MAINTENANCE
Maintenance of the heater consists in checking and exchanging of the anode rod.
Magnesium anode sets the electric potential inside the tank to a level that limits boiler tank corrosion.
Theoretically, its lifetime is calculated to two years of operation; however, it changes based on water hardness and
chemical composition at the place of use. Anode rod check and possible replacement is recommended every two years
of operation. Based on anode wear, set the time of the next check. We recommend you do not underestimate the
importance of this additional protection of the boiler tank.
Anode rod exchange method:
Turn off the boiler control voltage;
1.
Drain about 1/5 of the volume of water from the heater.
2.
Procedure: Close the water entry valve to the boiler
Open the hot water valve on the combination faucet.
Open the boiler drain tap
3. The anode is screwed in under the plastic guard in the top lid of the heater.
4. Unscrew the anode using adequate wrench
5. Pull the anode out and follow reversed steps to install a new one
6. During the assembly, make sure the ground wire is connected properly; it is essential for proper anode
function
7. Fill the boiler with water.
Have the company in charge of service affairs exchange the anode.
WARNING:
To prevent formation of bacteria (e.g. Legionella pneumophila) within stack heating it is recommended, if absolutely
necessary, to increase the temperature of HSW periodically for a transitional period of time to at least 70 ° C. It is also
possible to make use of another way of HSW disinfecting.
Theoretical kinetics of Legionella necrotising for practice.
Temperature range
50 to 60°C
60 to 70°C
over 70°C
Operation time
necessary
several hours
several minutes
several seconds
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