SERVICE AND SPARES
6 720 821 670 (2018/06)
49
CLEANING THE PRIMARY HEAT EXCHANGER
▶ Refer to figure 64 and access the heat exchanger flue ways by
inserting the cleaning brush (7 716 192 312) through the top access
hole in the casing, removal of panel shown in figure 60.
▶ Clean heat exchanger flue ways using the cleaning brush removing any
debris from the access point in the sump.
▶ Clean around the sealing surface on the sump.
▶ Replace the access cover.
▶ Using a suitable container to collect water from syphon connection at
the base of the appliance flush heat exchanger with water.
▶ Re-assemble ensuring that the lower baffle (2) and the top baffle (1)
are refitted correctly.
▶ Refer to figure 61 when re-fitting the burner to ensure that it fits
centrally within the heat exchanger and location tabs are situated in
location holes.
▶ Ensure that the seal is replaced with a new seal and ensure that the
seal is correctly fitted.
– For full details on refitting the seal and clamping plate assembly
see section 7.8.11, Re-assembly of the burner clamping plate.
▶ Check the syphon unit is clean before refitting to appliance.
▶ Reassemble and check combustion as stated in “SETTING THE AIR/
GAS RATIO” section on page 47.
Fig. 64 Cleaning heat exchanger
7.7.1
SYPHON REMOVAL AND CLEANING
To release the syphon from the sump:
1. Undo the plastic nut on the bottom of the syphon and move the
condensate pipe away from the syphon.
2. Remove the two screws retaining the syphon bracket.
3. Remove the bracket.
4. Remove the screw and release the syphon retaining clamp
5. Swing the clamp completely to the left away from the syphon
6. Pull the syphon towards you and remove from the sump connection.
▶ Empty the contents of the syphon into a suitable container.
▶ Flush the syphon through with clean water
Fig. 65 Syphon removal
The heat exchanger does not need to be removed to
clean.
The heat exchanger is shown removed from the
appliance to illustrate cleaning more clearly.
NOTICE:
Heat exchanger baffles.
The baffles (1) and (2) must be refitted into the heat
exchanger in the order shown in figure 62. Failure to do
so may result in damage to the appliance.
6720643895-65.1W
o
NOTICE:
CO/CO
2
CHECKS
▶ If the joint between the Air/Gas manifold and heat
exchanger is disturbed, replace the sealing gasket.
▶ After completing the service of the appliance, the
CO/CO
2
must be checked and set to the limits shown
in “Setting the air/gas ratio” on page 47.
▶ When replacing the burner gasket ensure that the
clamping plate is fully tightened down to the heat
exchanger.
Remove the syphon assembly to clean.
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2.
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4.
5.
6.
Summary of Contents for Worcester GREENSTAR 12Ri ErP +
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Page 64: ...6 720 821 670 2018 06 64 Notes ...
