Proheat M80 - Manual (Page 41)

PROHEAT G-I PCM SERVICE MANUAL 4-10
b) Loosen and remove the valve stem. Remove the O-ring, plunger and
spring. Save the parts.
c) Inspect the O-ring and plunger seat for contamination. Clean as
necessary using electrical contact cleaner cleaner. Reinstall the valve
stem and seal. DO NOT INSTALL THE PLUNGER AND SPRING.
d) Reinstall the coil, coil nut and reconnect the Fuel Shut-off Valve to the G-I PCM.
e) Reinstall the burner head by mounting it against the heat exchanger face,
turning clockwise to engage the mounting ears on the bolts.
f) Reconnect electrical harnesses and fuel supply line.
g) Switch the PROHEAT on and operate for at least one complete cycle.
Observe the operation.
If the PROHEAT runs OK, the Fuel Shut-off Valve is faulty. Go to Fuel
Shut-off Valve replacement.
If a Start diagnostic code is indicated, proceed to Step 5.
Fuel Shut-off Valve replacement:
a) Using a flat head screwdriver, hold the stem in place while loosening the
coil nut. Remove the coil.
b) Loosen and remove the valve stem. Remove the O-ring, plunger and spring.
c) Inspect the O-ring and plunger seat in the fuel block for contamination.
Clean as necessary using plastic safe electrical contact cleaner cleaner.
d) Install the new valve stem and seal using a slot screwdriver.
e) Reinstall the coil, coil nut and reconnect the Fuel Shut-off Valve connector
at the G-I PCM.
f) Reinstall the burner head by mounting it against the heat exchanger face,
turning clockwise to engage the mounting ears on the bolts.
g) Reinstall electrical harnesses and fuel supply line.
h) Switch the PROHEAT on and operate for at least one complete cycle.
Observe the operation.
WARNING
Flammable.
Figure 4-12: Fuel Shut-Off Valve Assembly
COIL
O-RING
PLUNGER
STEM
TORQUE = 25 in-lbs
± 3 in-lbs (3.4 Nm ±
0.3 Nm)
COIL NUT
TORQUE = 25 in-lbs
± 3 in-lbs (3.4 Nm
± 0.3 Nm)
SCREWDRIVER SLOT
TORQUE = 25 in-lbs
± 3 in-lbs (3.4 Nm ±
0.3 Nm)
NOTICE
All plugs/harnesses must be rein-
stalled into the Proheat Control
Module (G-I PCM) before heater goes
back into service.