Air Proving Switch; Flapper - L.B.White Guardian AD/AW060 Manual Del Usuario E Instrucciones

NOTES:
a. Fan wheel to motor mount plate spacing must be
adjusted to the clearance specified 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
flats 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.
AD/AW60 - AD/AW100 - AD/AW250
(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
CLEARANCE
1/4 in. AD/AW60-100
1/8 in. AD/AW250
AW325
Owner's Manual • Guardian
FIG. 11 a.
AIR PROVING SWITCH
FIG. 11 b.
AIR PROVING SWITCH
Flapper (Sail)
(AW325)
The flapper, located within the housing at the
blower discharge, works in conjunction with the air
proving switch in proving that proper air flow has
been achieved by the fan and motor before allowing
an ignition cycle to continue. See Fig. 12.
If the flapper is binding, its arm will not engage the
air proving switch and ignition will not occur.
Ensure the flapper lifts freely, that it does not bind
on the fan housing and that it is free of dust and
other debris.
FIG. 12
17