Glow-worm Micron 70FF - Manual (Page 20)

20 2000225229C
REMEMBER: When replacing a part on this appliance, use only
spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use
reconditioned or copy parts that have not been clearly authorised
by Glow-worm.
Products of Combustion Check
NOTE: To obtain a products of combustion reading, remove the
cap from the sampling point, located on top of the inner casing,
see diagram 8.1.
Connect the analyser tube onto the nipple.
Switch on the electrical supply and gas supply then operate the
boiler.
On completion of the test switch off the electrical supply and the
gas supply, remove analyser tube and replace sampling point
cap.
Servicing
Before servicing turn off the gas and isolate the electrical supply
to the boiler.
After completing a service always test for gas soundness, make
electrical checks and carry out functional check on controls.
Unless stated otherwise all parts are replaced in the reverse
order to removal.
8.1 Access
Remove the boiler case, see diagram 5.1 and Section 5.2.
8.2 Burner
Remove front combustion chamber cover which is secured by
two screws, see diagram 10.5.
Remove electrode bracket by undoing screw and withdrawing
off locating pin, see diagram 8.5.
The HT lead and earth lead (still connected) will allow electrode
to hang down at the front of the appliance.
Remove control box retaining screw and swing control box out,
see diagram 5.10.
Remove burner retaining screws, located under boiler casing,
see diagram 8.3.
Pull out burner together with the baffle support, see
diagram 8.3.
To remove baffle support from burner, slide off retaining pins
see diagram 8.3.
Use a vacuum cleaner or suitable stiff brush to clean the burner
thoroughly, making sure that all the burner ports are clear and
unobstructed.
On refitting and after cleaning the heat exchanger make sure
the burner is fitted correctly, that is, located on the injector
manifold pins and horizontal, see diagram 8.4.
NOTE: It is advisable while servicing the burner to check the
combustion insulation and replace if damaged, see Section
10.10.
8.3 Cleaning Heat Exchanger Flueways
Disconnect the air pressure switch tube connections, red from
fan, both clear tubes from test nipple, see diagram 8.1.
Remove the blue and purple electrical connections from the fan
see diagram 5.5.
Remove the fan assembly complete with the flue elbow, see
diagram 5.5 and Section 5.3.
Place a sheet of paper in the base of the combustion chamber
and over the injectors to prevent particles entering.
Remove the baffles, see diagram 8.2.
Clean the heat exchanger flueways with a suitable stiff brush.
Remove the paper together with any debris.
8 Servicing
Diagram 8.2
BAFFLE
(8 off)
12312
Diagram 8.1
CLEAR AIR
PRESSURE
TUBES
SAMPLING
POINT
RED AIR
PRESSURE
TUBE
7231
Diagram 8.3
ELECTRODE
BRACKET
12273
BAFFLE SUPPORT
BURNER
SCREW
BURNER RETAINING
SCREWS
RETAINING PINS
Diagram 8.4
BURNER
INJECTORS 7171 LOCATION
PIN
LOCATION
PIN