E93.1803.901 HW
125
When faults and abnormalities are found by the service technician during service and mainte-
nance 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
disconnected, checked and replaced. Make sure that all these components are mounted cor-
rectly before commissioning the water heater again.
Cleaning the combustion chamber and heat exchanger with acid or alkali products is prohibited.
20.1.1
D
ECALCIFYING OF THE
H
EAT EXCHANGER
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. Failure to flush 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 pump outlet hose (H1) to the hot water line at service valve (V1).
5. Connect drain hose (H3) to 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 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 service valve, (V1), and open shutoff valve, (V3).
12. Disconnect all hoses.
WARNING
Flushing
White vinegar or
citric acid
System
Supply
System
Return
Draining
System
Supply
System
Return
Drain
Summary of Contents for CB 105 HW
Page 69: ...E93 1803 901 HW 70 12 6 Electrical schematic...
Page 70: ...E93 1803 901 HW 71...
Page 71: ...E93 1803 901 HW 72 12 7 Ladder Logic Diagram LOW MAINS VOLTAGE VOLTAGE...
Page 127: ...E93 1803 901 HW 128 22 SPARE PARTS CB 85 HW CB 105 HW and CB 125 HW exploded view...
Page 128: ...E93 1803 901 HW 129...
Page 129: ...E93 1803 901 HW 130 CB 155 HW exploded view...
Page 130: ...E93 1803 901 HW 131...
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