Checking Dhw Heating - Wolf CGB-2 Service Instructions Manual

Shut off cold water and relieve hydraulic pressure in
the system.
Clean the cold water strainer.
(Only for CGB-2K wall mounted combi boiler.)
If CGB-2K, CGW-2 or CGS-2L have inadequate DHW
output, proceed as follows:
Non-return valve on CGW-2 and CGS-2L:
Check and descale if necessary.
Dirt filter on CGB-2K:
Check and clean.
Removing the plate heat exchanger on CGB-2K,
CGW-2 and CGS-2L (not on CGS-2R)
Undo the knurled nuts (2 pce) under the panel with a
4 mm Allen key and pull the plate heat exchanger off
upwards.
Descale or replace the plate heat exchanger.
After installation, tighten the knurled nuts with a torque
of 3.5 ± 0.5 Nm.
Checking the protective anode (only on CGS-2L/R)
- Shut off the cold water valve.
- Depressurise the cylinder.
- Remove the cover.
- Unscrew the protective anode for checking.
- In case of significant wear, replace the anode.
In principle, the CGW-2 cylinder is maintenance-free.
Tightening torque for the nut for the bracket of the hand-
hole cover: 55-60 Nm
Test run
Set MCBs, open gas ball valve and switch on
the appliance.
Check the gas train and hydraulics for tight-
ness.
Replace and secure the casing.
Press the Emissions test key.
Check the appliance for gas leaks (gas and
exhaust gas lines) during operation.
22
15. Checking DHW heating
Plate heat
exchanger
Plate heat exchanger
Mounting Cold water strain-
bracket er
Knurled
nuts
Protective
anode
Key
Emissions
test mode
Cover
Non-return valve
(dirt filter)
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