39
BOXER
combination boiler -
Installation and Servicing
SERVICING
SER
VICING
60 GAS CONTROL VALVE REPLACEMENT
1.
Refer to Frame 49.
2.
Remove the casing. Refer to Frame 41.
3.
Remove the expansion vessel and shield/air guide. Refer
to Fr
ame 43
.
4.
Unscrew the securing screw and unplug the electrical
lead from the gas control valve.
5.
Unscrew the gascock hexagon nut from the gas valve;
then unscrew the two screws fixing the gas valve placed
at the bottom of the rear chassis.
6.
Unscrew the burner gas pipe nut.
7.
Extract the gas valve from the boiler.
8.
Unscrew the four screws retaining the burner gas pipe.
9.
Fit the new valve and re-assemble in reverse order, using
new seals as necessary.
10.
Unscrew the main burner minimum pressure adjuster.
Refer to Fr
ame 35
.
11.
Check the operation of the boiler and adjust the maximum
and minimum pressures as necessary. Refer to Fr
ame
35
.
4
5
6
8
7
61 PCB REPLACEMENT
1.
Refer to Frame 49.
2.
Remove the casing. Refer to Frame 41.
3.
Swing the control housing down into the servicing
position. Refer to Frame 42.
4.
Remove the two knobs. To remove also the two shafts it is
necessary to squeeze the shaft ends with a pliers.
5.
Unplug the electrical leads and low voltage leads from the
PCB, unscrew the two screws and remove.
6.
Fit the new PCB to the working position and secure with
the two screws.
7.
Adjust the P1 potentiometer to its mid position.
8.
Re-assemble in reverse order, ensuring that the PCB is
located correctly in the housing before reconnecting the
electrical wiring.
9.
Check the operation of the boiler and adjust the maximum
and minimum pressures as necessary (Refer to Frame
35)
5
4
5
4
7
