Wolf CGU-2-18 Installation And Maintenance Instructions Manual page 54

Cleaning the heating water heat exchanger:
- Detach cable from ventilator (only CGG-2(K))
- Undo the fan fixing screw [6] and remove the fan
(only CGG-2(K)).
- After undoing both fixing screws, remove the front
wall of the combustion chamber [7].
- Detach flue gas temperature limiter
(only CGU-2(K)) [8]
- Remove flue pipe or bend and remove flue collectors
or draught hood from front or above
(Please note: when assembling CGU-2(K) at the rear
edge of the draught hood, push between the heating
water heat exchanger and guide rails)
- Clean the heating water heat exchanger from the
top and the bottom with a brush (non-metallic) and, if
required, blow off residues with compressed air
During this step, take care not to bend the fins. If
necessary straighten them with a pair of pliers [9]
Disassemble severely contaminated heating water
heat exchangers
- Before disassembling the heating water heat
exchanger depressurise and isolate the system
on the water side, close gas valve, observe safety
instructions
- Remove 2 x retaining clips from the flow-return heating
water heat exchanger, placing them at the front [10]
- Disassemble heating water heat exchanger by
lightly shaking it free from above the pipework
(pay attention to O-ring thicknesses)
- Clean heating water heat exchanger with a soapy
solution
- Reassemble the components in reverse order
Fig.: Heating water heat exchanger [9]
54
Maintenance
Flue gas
temperature
limiter [8]
Heating water heat exchanger
Fig.: CGU-2(K)
Fixing screws
of ventilator [6]
Flue gas
collector
Combustion
chamber fixing
screws [7]
Fig.: CGG-2(K)
Remove retaining clips [10]
Fig.: Heating water heat exchanger removal
Draught hood
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