Trane GXAA Installation, Operation And Maintenance Manual page 31

F F i i r r e e H H a a z z a a r r d d ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y , , a a n n d d p p r r o o p p e e r r t t y y
d d a a m m a a g g e e . .
A A u u n n i i t t s s h h o o u u l l d d n n e e v v e e r r b b e e a a l l l l o o w w e e d d t t o o c c y y c c l l e e o o n n t t h h e e p p r r i i m m a a r r y y l l i i m m i i t t f f o o r r a a p p r r o o l l o o n n g g e e d d p p e e r r i i o o d d o o f f
t t i i m m e e . . I I t t i i s s a a s s a a f f e e t t y y c c o o n n t t r r o o l l t t o o p p r r e e v v e e n n t t a a f f i i r r e e . . I I f f c c y y c c l l i i n n g g o o n n t t h h e e p p r r i i m m a a r r y y l l i i m m i i t t i i s s n n o o t t e e d d , ,
c c o o r r r r e e c c t t i i v v e e m m e e a a s s u u r r e e s s s s h h o o u u l l d d b b e e t t a a k k e e n n i i m m m m e e d d i i a a t t e e l l y y . .
I I m m p p o o r r t t a a n n t t : : At initial unit installation, unit should be started momentarily to confirm proper
Two basic air control systems can be used to deliver conditioned air to the occupied space:
intermittent or constant fan operation.
I I n n t t e e r r m m i i t t t t e e n n t t F F a a n n O O p p e e r r a a t t i i o o n n : The unit employs an air control system which utilizes a fan time
delay relay to operate the fan while heating and the thermostat while cooling. Refer to unit wiring
diagram.
C C o o n n s s t t a a n n t t F F a a n n O O p p e e r r a a t t i i o o n n : The unit can be wired to give an air control system which constantly
circulates air through the unit and occupied space with constant fan operation. Refer to unit
wiring diagram.
I I m m p p o o r r t t a a n n t t : : Check blower belt tension. Proper belt tension is important to the long life of the belt
It is important that the blower motor and the blower wheel pulleys be in good alignment, with
the motor and blower shafts parallel.
Belt tension must be adjusted to give approximately 3/4 inch deflection of the belt when finger
pressure is applied to the middle of the belt (See
may be necessary for optimum operation. Belts will stretch over a period of time, requiring an
adjustment to this tension. See Maintenance section for belt and pulley adjustments.
These units are set at the factory for the RPM required to meet the air volume (CFM) and external
static pressure ordered. If the estimated external static is incorrect, or changes were made to the
duct system, the blower RPM may need to be changed.
Both the Standard and High CFM Blowers use motors which are equipped with adjustable pitch
pulleys. After removing belt(s), loosen the pulley set screw and remove the key, turn adjustable
half of a pulley clockwise to increase RPM, or counter-clockwise to decrease RPM. Insert key,
MUA-SVX006B-EN
blower wheel rotation as the unit will deliver some air with the blower wheel running
backwards.
and motor. Proper belt tension will allow the belt to be depressed 1⁄2 inch to 3⁄4 inch.
Figure 21. Belt Tension Guide
W W A A R R N N I I N N G G
Figure 21, p. 31). Small changes in this tension
O O p p e e r r a a t t i i o o n n
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