Trane GGAA Installation, Operation And Maintenance Manual page 24

O O p p e e r r a a t t i i o o n n
I I m m p p o o r r t t a a n n t t : : It is important that the final temperature leaving the unit does not exceed 160° F (71°
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.
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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
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C). When final air throughput adjustments are being made, a check of the discharge
air temperature should be made after unit has operated for 15 to 20 minutes.
blower wheel rotation as the unit will deliver some air with the blower wheel running
backwards.
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.
and motor. Proper belt tension will allow the belt to be depressed 1/2" to 3/4".
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" deflection of the belt when finger
pressure is applied to the middle of the belt (See
tension may be necessary for optimum operation. Belts will stretch over a period of time,
requiring an adjustment to this tension. See
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, tighten set screw and replace belt(s). Adjust belt tension to give 1/2" to 3/4" belt
play when depressed.
B B l l o o w w e e r r M M o o t t o o r r F F a a i i l l u u r r e e ! !
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 i i m m p p r r o o p p e e r r u u n n i i t t o o p p e e r r a a t t i i o o n n a a n n d d m m o o t t o o r r
f f a a i i l l u u r r e e . .
B B l l o o w w e e r r m m o o t t o o r r f f u u l l l l l l o o a a d d a a m m p p s s 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 e e x x c c e e e e d d e e d d . . R R e e f f e e r r t t o o m m o o t t o o r r d d a a t t a a p p l l a a t t e e f f o o r r
m m a a x x i i m m u u m m f f u u l l l l l l o o a a d d a a m m p p s s . .
After changing blower RPM, confirm blower motor full load amps have not been exceeded.
See motor data plate for maximum full load amps.
W W A A R R N N I I N N G G
Figure 10, p. 25). Small changes in this
"Maintenance," p. 30
N N O O T T I I C C E E
section for belt and pulley
MUA-SVX005B-EN