15
■
The igniter/sensor assembly may require cleaning due
to accumulations of dust and dirt over a period of time,
affecting its ability to ignite fuel gas and sense burner
flame. Cleaning will require igniter/sensor removal.
-- If spark appears to be weak, rub the igniter electrode
with emery cloth or steel wool to remove any buildup.
--- If the spark appears strong but the heater cycles off,
rub the sensor rod with emery cloth or steel wool to
remove any build-up.
■
Ensure the igniter gap is 4.0 mm and the igniter tip is
positioned over the burner port according to the
illustration below. See Fig. 19.
IGNITER AND FLAME SENSOR
1. Remove the following in the order given:
-- Gas hose and sediment trap from the inlet of gas
the control valve.
-- Two screws at the inlet of the gas control valve
securing the valve to the case. See Fig. 20.
-- Bolt with washer securing the manifold to the
burner and base. See Fig.21.
2. Lift and pivot the gas valve with manifold as needed to
so burner orifice clears the venturis of the burner. See
Fig.22.
3. Replace components as needed.
FIG. 20
FIG. 21
FIG. 22
GAS CONTROL VALVE AND BURNER ORIFICE
SENSOR
IGNITER
2.5 mm - 4.5 mm
HEAT CHAMBER FACE
BURNER
IGNITER LEAD
SENSOR LEAD
IGNITER / SENSOR
ENCLOSURE
TO REMOVE IGNITER / SENSOR WITH ENCLOSURE
REMOVE SCREW, LIFT ASSEMBLY
FROM ITS MOUNTING SLOTS
TO GAP IGNITER LOOSEN SCREW.
MOVE ENCLOSURE UP OR DOWN
TO ALLOW PROPER POSITIONING
OF IGNITER TO BURNER.
FIG. 19
4.0 mm
SCREWS
BOLT AND WASHER
(UNDERSIDE OF BASE)
ORIFICE
VALVE
