Supplied By www.heating spares.co Tel. 0161 620 6677
23
Servicing Instructions - Page 23
B.
Refit the burner and gas control valve assembly into the
boiler, ensuring that the locating pin on the rear of burner
engages correctly into the rear support bracket. Make sure
that the sealing gasket is in place and undamaged between
the burner flange and the case. Secure the assembly with
two screws.
C.
Refit the screw securing the gas control valve to the
support bracket.
D.
Reconnect electrode lead to electrode.
E.
Plug gas control valve supply leads into control box.
F.
Reconnect gas supply at gas service cock and turn on gas.
G.
Refit the combustion chamber front panel.
6.
FAN
A.
Carefully clean any deposits from around the fan motor and
its supports.
B.
Very gently clean the fan impellor taking care not to
damage the aluminium impellor or dislodge its balance
weights.
C.
Replace the fan and its mounting plate. Ensure that the
securing screws are fully tightened as an air tight seal must
be obtained between the fan assembly and the main boiler
casing.
D.
Reconnect the fan supply leads (polarity is not important).
7.
CASE SEAL
Check the case door seal. Replace if damaged. The seal is
simply pressed into the channel around the door.
8.
RECOMMISSION
Following the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions page 18.
9.
OTHER BOILER MOUNTED UNITS
No further servicing is required on any other boiler mounted
units. Repair is by replacement.
10.
FAULT FINDING
Refer to Fault Finding Chart FIG. 31 and Wiring Diagram
FIGS. 27, 28.
REMOVAL/REPLACEMENT OF BOILER MOUNTED UNITS
GAS CONTROL VALVE
(Note: the White Rodgers and SLT. control valves are not
Interchangable, and must be replaced like for like.)
Replacement is most easily carried out by first removing the burner
and gas control valve assembly as follows:-
1.
Switch oft the external electricity supply by disconnecting the
plug at the socket or switching off the external isolating switch.
2.
Remove controls cover, case door and combustion chamber
front panel as described in 1. ‘Preparing the Boiler for Servicing’,
operations A,B and C.
3.
Remove the burner and gas control assembly as described in 1.
Preparing the Boiler for Servicing’, operations I, J, K, Land M.
4.
Disconnect the electrical supply from the gas valve. Note: White
Rodgers, has individual Wire positions. Refer to
FIGS. 27 and 28.
5.
Unscrew the union connecting the pilot supply pipe to the gas
control valve.
6.
Separate the gas control valve from the flange at the outlet port
by removing the securing screws, remove two M4 screws
retaining valve support bracket, unscrew gas inlet assembly at
valve. Note: The S.I.T. valve is used in connection With a spacer
and gasket.
7.
Replacement is the reverse of removal. Ensure that the electrical
connections are remade correctly - see diagram on page 20.
8.
Follow the full commissioning proceedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
FAN
1.
Switch off the external electricity supply by disconnecting the
plug at the socket or switching off the external isolating switch.
2.
Remove controls cover and case door as described in 1.
‘Preparing the Boiler for Servicing’, operations A and B.
3.
Disconnect the fan supply leads from the connector adjacent to
the fan.
4.
Remove the screws securing the fan to the mounting plate and
remove fan.
5.
Replacement is the reverse of removal.
6.
Following the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
MAIN BURNER
1.
Switch off the external electricity supply by disconnecting the
plug at the socket or switching off the external isolating switch.
2.
Remove controls cover, case door and combustion chamber
front panel as described in 1. ‘Preparing the Boiler for Servicing’,
operations A, B and C.
3.
Remove the burner and gas control assembly as described in 1.
‘Preparing the Boiler for Servicing’, operations I, J, K, L and M.
4.
Unscrew the union nuts connecting the pilot supply pipe to the
pilot and gas control valve. Take care not to damage the
electrode and be careful that the pilot injector does not fall out
during this operation.
Remove sealing grommet and withdraw the pilot tube through the
hole in the burner mounting flange.
5.
Separate the burner from the gas control valve at the flanged
connection by removing the four securing screws.
6.
Unscrew the pilot, main burner injector and pressure test nipple
from the burner.
7.
Replacement is the reverse of removal.
8.
Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
PILOT/IGNITION ELECTRODE
1.
Switch off the external electricity supply by switching off the
external isolating switch.
