MAIN BURNER
Refer to
FIG. 19
and carry out the following:
a) Switch off the external electricity supply by disconnecting the plug at the so
cket or switching off external isolating switch.
b) Carry out operations A and B as described in section
1 PREPARING THE
BOILER FOR SERVICING.
c Turn off the gas service cock and remove burner and gas control assembly
as described in section
2. MAIN BURNER ASSEMBLY -
REMOVAL AND CLEANING
,operations A, B, C, D, G. Separate the pilot from
the main burner as described in the same section, operation H.
d) Remove split grommets sealing the thermocouple lead, pilot tube and electr
ode lead to the burner mounting flange.
e) Remove the four screws securing the burner manifold flange to the gas con
trol valve.
Note:
A spacer is used at this joint requiring the use of two sealing
gaskets.
f) Lift burner away from the gas control valve while feeding the thermocouple l
ead, electrode lead and pilot tube through the holes in the burner mounting fla
nge.
g) Remove the rear locking nut securing the spark generator to the mounting
bracket on the burner and withdraw the spark generator.
h
Replacement is the reverse of removal. Use new sealing gaskets on reassem
bly. Ensure that the thermocouple lead, electrode lead and pilot tube are corre
ctly replaced inthe split grommets. Ensure also that the sealing gasket beneat
h the burner mounting flange is correctly positioned and a good seal is obtaine
d.
i) Follow the full commissioning procedure as detailed in the
COMMISSIONIN
G
section of these instructions.
LINT ARRESTING GAUZE
To remove the lint arresting gauze follow the procedures described in section
1 PREPARING THE BOILER FOR SERVICING
and section 2
MAIN BURNER
ASSEMBLY -REMOVAL and CLEANING
operations A, B, C, D, E.
Replacement is the reverse of removal.
GAS CONTROL VALVE
Summary of Contents for CF 20/35
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