Air Proving Switch; Flame Sensor (Hsi) - LB White Guardian AD060 Manual Del Usuario

20
Guardian with Smart Sense™
FIG. 11
MOTOR MOUNT PLATE
MOTOR
AD060/100 - 3/16 IN.
AW060/100 - 3/16 IN.
AD/AW250 - 1/8 IN.

Air Proving Switch

The air proving switch is located on the fan housing
at Fig. 12 the motor end of the heater. It must work
properly to allow an ignition cycle. If the air proving
switch contacts are closed before the ignition control
starts the fan motor, or do not close on a call for
heat after the fan motor starts, ignition will not occur.
See Fig. 12.
To service:
-- Remove the two (2) sheet metal screws holding
the switch with bracket to blower housing.
-- Remove the assembly by turning the switch
so the paddle on the switch arm can be pulled
through the oblong hole on side of fan housing.
FIG. 12
Owner's Manual • Guardian
Igniter (HSI)
FAN WHEEL
1. See Fig. 13 for location.
2. Generally, igniter replacement consists of removing
Testing
■ Perform an ohm check at the ignition control terminals
■ This verifi es circuit integrity of the igniter and its as-
CLEARANCE
■ Ohm readings will vary somewhat, but generally will be

Flame Sensor (HSI)

1. Remove the sensor from its mounting bracket. See
FIG. 13
2. Check the fl ame sensor's insulator base for cracks. If
3. Position the fl ame sensor as shown in Fig. 14.
FIG. 14
BURNER
FLAME
its mounting screw and cutting the shrink tubing to
expose the male igniter connector and female wire
harness connector. (Specifi c change-out instructions
accompany the replacement igniter).
HSI and HSIG when the igniter is cold.
sociated wiring and connections.
in the range of 50-55 ohms.
Figs. 13 and 14. Clean the sensor rod with steel wool
or emery cloth. Rub briskly to remove build up of dust,
dirt and oxide.
SENSOR
SCREW
FEMALE MALE
CONNECTOR CONNECTOR
cracks are found, replace the sensor.
BURNER
CASTING
IGNITER
BRACKET
BURNER
3/8 TO 1/2 IN.
FLAME SENSOR