Potterton Prorile Prima 30e Installation And Servicing Instructions page 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.
7. CASE SEAL
Check the case door seal. Replace if damaged. The seal is
simply pressed into the channel around the door.
8. RECOMMISSION
Follow 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. 30 and Wiring Diagram
FIGS. 26, 27.
REMOVAL/REPLACEMENT OF BOILER
MOUNTED UNITS
GAS CONTROL VALVE
This operation is most easily carried out by first removing the
burner and gas control valve assembly as follows:
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 G, H, I, J &
K.
4. Disconnect the electrical supply wires from the gas control
valve noting their position. Refer to FIGS. 26 & 27.
5. Unscrew the union connecting the pilot supply pipe to the gas
control valve.
6. Separate the gas control valve from the flanges at the inlet
and outlet ports by removing the securing screws.
NOTE: A spacer is used between the valve outlet and the
burner flange, requiring the use of two seals at this point. See
FIG. 25.
7. Use new seals on re-assembly.
8. Replacement is the reverse of removal.
9. Follow 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 G, H, I, J &
K.
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.
NOTE
A spacer is used between the valve outlet and the burner
flange, requiring the use of two seals at this point.
See FIG. 25.
6. Unscrew the pilot, main burner injector and pressure test
nipple from the burner.
7. Use new sealing gaskets on re-assembly.
8. Replacement is the reverse of removal.
9. 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 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. Disconnect the electrode lead from electrode.
4. Unscrew the aluminium pilot tube from the pilot assembly.
Take care not to damage the electrode.
5. Unscrew the two hexagonal head screws securing the pilot to
the main burner and remove the pilot assembly and shield
where fitted, be careful that the pilot injector does not fall out
during this operation.
Unscrew electrode retaining nut and withdraw the electrode.
6. Replacement is the reverse of removal. On re-assembly
ensure that the spark gap is as illustrated in FIG. 29.
7. Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
COMBUSTION CHAMBER INSULATION
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