Air Throughput; Air Filters (On Mated Air Moving Device) - Trane GRAA Installation, Operation And Maintenance Manual

Air Throughput

Static Pressure through the duct furnace should not exceed 2.0 inches (0.50 kPa) water column.
The standard outdoor duct furnaces are operated at a temperature rise range of 20° to 60°F (11°
to 33°C) rise. The furnaces are also available at a higher temperature rise range of 30° - 90°F (17° -
50°C).
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 furnace does not exceed 150°F
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 . .

Air Filters (On Mated Air Moving Device)

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(66°C). When final air throughput adjustments are being made, a quick check of the
final temperature can be made by locating a thermometer approximately 6 to 12
inches (152 to 305 mm) downstream from the air discharge and approximately 3 to 4
inches (76 to 102 mm) from the bottom of the duct. The unit should be operated at
least 15 to 20 minutes before temperature readings are made.
It is recommended that air filters be changed or cleaned at least twice a year. More frequent
attention will be required if the air being handled is unusually dirty. Air flow reduction,
caused by clogging air filters, will increase the discharge air temperature and may cause
nuisance trip-outs.
Filters (by others) should be serviced regularly and changed or washed when necessary to
maintain the required throughput. In a dusty environment, filters may clog up in less than one
month. A clogged filter switch is recommended to assist with filter maintenance.
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