Cleaning the fan.
1. Unscrew the three M4 screws securing the fan motor/
impellor assembly and remove the assembly from the fan
scroll housing.
2. Using a soft brush, remove any accumulation of dust
from the fan blades, the inside of the fan scroll, the
‘square to round’ casting and the area around the multi-
hole plate.
3. Ret the fan motor impellor assembly in reverse order,
ensuring the motor leads are at the left-hand side to
avoid interference of the motor with the ow pipe and the
control panel.
Cleaning the module cover lter.
The module cover is tted with a polyurethane foam lter,
which forms the bottom of the cover. This lter is retained by
two edge clips and two M5 nuts.
To remove the lter, remove the two M5 nuts, then prize open
the edge clips and release the wire frame of the lter from the
clips (see Frame 26).
Wash the lter in lukewarm soapy water. It should then be
thoroughly rinsed and allowed to dry.
Ret in reverse order.
Re-assembly
1. Replace the ame sensing probe in position and lightly
tighten its retaining nut.
2. Replace the burner in the module, renewing the round
foil faced, glass-bre gasket complete with the ‘U’ shaped
extension.
Ensure the ignition electrode lug is fully seated into its
recess.
3. Remake the burner earth connection to the earth post.
4. Replace the fan assembly and secure it with the three
elongated M8 nuts.
Notes:
i. Do NOT overtighten the nuts as damage to the casting
may occur.
ii. If the round cork gasket between the ‘square to round’
casting and the burner is damaged it must be replaced.
5. Remake the 6 mm suction and pressure sensing lines.
Note. Both lines should be blown through to ensure they
are free from obstruction. Ensure that the compression
ttings are secure.
6. Remake the ame sensor plug and socket connection.
7. Remake the fan motor plug and socket connection.
8. Secure the fan motor lead and mains harness lead in the
clip on the left-hand underside of the fan plate.
9. Pass the ignition lead through the cable tie wrapped
round the return elbow behind the gas valve.
10. Remake the ignition electrode connection.
11. Secure the control panel with the M5 screw.
12. Remake the multi-pin plug connection.
13. Switch the on/off switch to ON.
14. Replace the front cover.
IMPORTANT
On completion of the Service, recommission and test the
boiler in accordance with the “Commissioning and Testing”
Instructions, page 22, with particular reference to measuring
the differential air pressure, and to fan performance and
safety checks.
HEAT EXCHANGER - CLEANING INSTRUCTIONS
Chemical cleaning of the dry side of the boiler modules.
WARNING. Before carrying out any servicing procedure:
1. Isolate the boiler electricity supply.
2. Turn off the gas service taps on the modules being
serviced.
This method of cleaning uses either FERNOX DS. 10 or
SENTINEL DRY SIDE CLEANSER which are available from
local stockists or the manufacturers:
Fernox, Cookson Electronics,
Forsyth Road, Sheerwater, Woking,
Surrey, GU21 5RZ
Tel. +44 (0) 01799 550811
Or
G E Betz, Sentinel Division,
Foundry Lane, Widnes, Cheshire, WA8 8UD
Tel. +44 (0) 0151 420 9563
The following method of cleaning assumes there is an
adequate supply of mains pressure water and a suitable drain
on site.
CAUTION.
When added to water both Sentinel Dry Side Cleanser and
FERNOX DS. 10 produce acid and MUST be treated with all
the required precautions.
Ingestion and contact with skin, eyes and clothing must be
avoided.
Wear rubber gloves and protective clothing, including safety
glasses to avoid splashes in eyes.
Accidental splashes should be NEUTRALISED
IMMEDIATELY with household soda as solution in water.
Sensitive areas, such as eyes, can be rinsed rst with
SODIUM BICARBONATE, followed by plain water. Obtain the
aid of a medical practitioner in the case of personal accident.
SERVICING AND FAULT FINDING
To Next Page
Loading...
Need help?
General