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When faults and abnormalities are found by the service technician during service and maintenance and
these are not repairable, this information should be reported to the owner/end-user of the installation.
Also the owner/end-user should be advised how to fix these faults and these faults should be reported in
the service report / log file of the water heater.
During service and maintenance, the gas, supply air, flue gas and condensate connections are discon-
nected, checked and replaced. Make sure that all these components are mounted correctly before com-
missioning the water heater again.
Cleaning the combustion chamber and heat exchanger with acid or alkali products is prohibited.
D
21.2.1
ECALCIFYING OF THE
Cleaning the heat exchanger (Every 2-year maintenance or as needed based on water quality)
The heat exchanger should be cleaned at the service interval every 2 years. Not flushing the heat exchanger will
cause damage to it. Follow the procedure below for cleaning the heat exchanger.
1. Turn off the DHW function on the boiler.
2. Check if pump P1 is resistant to the detergent
3. Close the shutoff valves on both the hot water and cold-water lines (V3 and V4).
4. Connect the pump outlet hose (H1) to the hot water line at service valve (V1).
5. Connect the drain hose (H3) to the service valve (V2).
6. Pour approximately 20 liter of virgin, food grade, white vinegar or citric acid into pail.
7. Place the drain hose (H3) and the hose (H2) to the pump (CP) inlet into the cleaning solution.
8. Open both service valves (V1 and V2) on the hot water and cold-water lines.
9. Operate the pump (CP) and allow the cleaning solution to circulate through the heat exchanger for at
least 45 minutes.
10. Turn off the pump (CP).
11. Rinse the cleaning solution from the heat exchanger as follows:
•
Remove the free end of the drain hose (H3) from the pail
•
Close the service valve, (V2), and open shutoff valve, (V4). Do not open shutoff valve, (V3).
•
Disconnect both H1 and H3 from the service valves
•
Connect H3 to V1 and place the end of the hose in a drain
•
Allow water to flow through the heat exchanger for 5 minutes
•
Close the service valve, (V1), and open the shutoff valve, (V3).
Flushing
System
System
Supply
Return
12. Disconnect all hoses.
H
EAT EXCHANGER
White vinegar or
citric acid
E93.1804.014
Draining
System
System
Return
Supply
Drain
125
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