Lennox XC17 Series Unit Information page 46

TOP GRILLE OR FAN MOTOR MOUNT ADJUSTMENT FOR FAN CLEARANCE
Sometimes during shipping, either the fan motor mounting or top grille may become out of alignment. This may cause the fan
motor blade to not clear the orifice ring. If this situation occurs, simply adjust either or both the fan motor mount or top grille
positions to allow proper clearance. The top grille four fastener insertion points to the plastic top and motor mount locations
are larger than the fasteners used to secure the grille and fan motor mounts. Use the procedures provided in figure 24 to
adjust for fan clearance.
GRILLE MOUNTING
PUSH
FORWARD
GRILLE MOUNTING POINTS
FAN MOTOR SURGE PROTECTION
(XC17−XXX−223−01 and −02 builds only)
Surge Protector (Metal Oxide Varistor − MOV) − A part
designed to protect electrical devices from voltage spikes
that are 3 to 4 times the normal circuit voltage (See figure
25 for illustration of component).
An MOV works as follows: It is essentially a batch of
metallic−oxide grains separated by insulating layers.
Repeated voltage surges break down the insulating layers,
lowering the overall resistance and eventually causing the
device to draw too much current and trip whatever
over−current protection is inherent in the system)
MOV Check: They are supposed to be located beyond the
line fuse (though possibly not always). In this case, where
the line fuse blows or circuit breaker trips but there is no
visible damage to the MOV(s), the simplest test may be to
just temporarily remove the MOV(s) and see if the problem
goes away.
XC17
POINTS
FORWARD
Figure 24. Fan Blade Clearance Adjustment
PUSH
FAN MOTOR MOUNTING POINTS
THE FOUR MOUNTING POINT HOLES THAT SECURE THE TOP
GRILLE TO THE PLASTIC TOP ARE LARGER THAN THE
FASTENERS USED TO SECURE THE GRILLE. THIS IS ALSO TRUE
FOR THE FOUR FASTENERS SECURING THE FAN MOTOR TO THE
TOP GRILLE. TO PROVIDE MORE CLEARANCE, PREFORM EITHER
OR BOTH OF THE FOLLOWING PROCEDURES.
TOP GRILLE ADJUSTMENT
1. LOOSEN THE FOUR GRILLE MOUNTING FASTENERS AND
PUSH THE GRILLE FORWARD. TIGHTEN MOUNTING
HARDWARE. IF THERE IS STILL INSUFFICIENT CLEARANCE
PROCEED TO STEP 2.
FAN MOTOR POSITION ADJUSTMENT
2. LOOSEN THE FOUR FAN MOTOR GRILLE MOUNTING
FASTENERS AND PUSH THE FAN MOTOR FORWARD.
TIGHTEN MOUNTING HARDWARE.
ORIFICE RING
See figure 1 for location of the surge protections device
which is located in the unit control box area. Note that in
some units, the surge protection device was not used.
Figure 25. Fan Motor Surge Protection Device (−01
Page 46
FASTENER
INSERTION POINT
and 02 builds only)