Air Proving Switch; Flapper - L.B.White Guardian AW060 Manual De Instrucciones

NOTES:
a. Fan wheel to motor mount plate spacing must be
adjusted to the clearance specifi ed below before
tightening the fan wheel to the motor shaft. See
Fig. 10.
b. Make sure that set screw(s) of the fan are on the
fl ats of motor shaft when tightening.
FIG. 10
MOTOR MOUNT PLATE
MOTOR

Air Proving Switch

The air proving switch is located on the fan housing
at 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.
AW060/100/250 (Fig. 11a):
-- 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.
AW325 (Fig. 11b):
-- Remove mounting nuts and slide the switch from
the mounting screws.
Guardian LP or Natural Gas Heater
FAN WHEEL
1/4 in. AW060/100
CLEARANCE
1/8 in. AW250/325
Owner's Manual • Guardian
FIG. 11 a.
AIR PROVING SWITCH
FIG. 11 b.
AIR PROVING SWITCH
Flapper (Sail)
(AW325)
The fl apper, located within the housing at the
blower discharge, works in conjunction with
the air proving switch in proving that proper air
fl ow has been achieved by the fan and motor
before allowing an ignition cycle to continue.
See Fig. 12.
If the fl apper is binding, its arm will not engage
the air proving switch and ignition will not occur.
Ensure the fl apper lifts freely, that it does not
bind on the fan housing and that it is free of
dust and other debris.
FIG. 12
19