48
221051B
48
SECTION
Replacement of Parts
12
Air Pressure Switch
Note: Alternative types of Air Pressure
Switches may be fitted.
Gain access as Section 10 steps 1 to 4.
Remove the air pressure tubes and
electrical connections, release the screws
and nuts, remove the switch.
When fitting the replacement make sure
that all the plastic tubes and electrical
connections are made as shown.
Gas Valve
Gain access as Section 10, steps 1 to 4.
Disconnect all electrical leads from the
gas valve.
Disconnect the pilot pipe at the pilot
burner.
Undo the four screws and at the outlet
manifold and disconnect the gas service
cock union.
Transfer the half union of the gas service
cock to the inlet of the replacement gas
valve. Also transfer the pilot supply
pipe, make sure that the restrictor is in
place in the pipe. Use a little thread
sealant on the external threads to ensure
gas soundness.
Fit the new valve, take care not to
damage the “O” ring.
It will be necessary to purge the
pipework and valve before relighting,
check gas pressure settings, refer to
Section 7.
2919
SECURING
SCREW (2)
YELLOW
GAS SERVICE
COCK UNION
BROWN
BLACK
BLUE
G/Y
WIRING
DIAGRAM
SECURING
SCREW (4)
RED AIR
PRESSURE
TUBE
BECK
YAMATAKE
RED
RED AIR
PRESSURE TUBE
CLEAR AIR
PRESSURE TUBE
YELLOW
BLACK
SECURING
SCREW (2)
BLACK
CLEAR AIR
PRESSURE TUBE
RED
ELECTRICAL
LEADS
PILOT
BURNER
PILOT
PIPE
"O" RING
EARTH
CONNECTOR
