Payne PG9YAA036060 Installation Instructions Manual page 37

WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or
death.
Cool air passing over heat exchanger can cause condensate to
form resulting in heat exchanger failure.
Connections
NOTE: On upflow installations, return air can enter through
either side, both sides, or the bottom. On horizontal installations
the return air must enter through the knockout opening in the
lower panel of the furnace. Return air can not enter through rear
of the furnace. When the furnace is located in an area near or
adjacent to the living area, the system should be carefully
designed with returns to minimize noise transmission through the
return grille. Any blower moving a high volume of air will
produce audible noise which could be objectionable to when the
unit is located very close to living areas. It is advisable to route
the return air ducts under the floor or through the attic.
1. For side connections using a 16" x 25" (406.4 x 635.0
mm) filter, cut out the embossed area shown in Fig. 38.
This will provide a 14
approximate opening.
NOTE: Furnaces with 5 ton cooling rating may require both
(left and right) side return or one side and bottom return.
Side return air duct(s) is not permitted with horizontal
furnace installation.
" Height of Cutout for 16" x 25" Filter
1
A = 14 /
2
" Width of Cutout for 16" x 25" Filter
1
B = 22 /
2
Embossed Area
on Side of Furnace
Fig. 38 - - Side Return Air Cutout
2. Bottom returns can be made by removing the knockout
panel in the furnace base. Do NOT remove knock-out ex-
cept for a bottom return.
3. Installation of locking-type dampers are recommended in
all branches, or in individual ducts to balance system's air
flow.
4. Non-combustible, flexible duct connectors are recommen-
ded for return and supply connections to furnace.
5. If air return grille is located close to the fan inlet, install at
least one, 90° air turn between fan and inlet grille to re-
duce noise.
NOTE: To further reduce noise, install acoustical air turning
vanes and/or line the inside of duct with acoustical material.
1 1
/ " x 22 / " (368.3 x 571.5 mm)
2 2
B
A
Furnace
Bottom
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Sizing
Existing or new ductwork MUST be sized to handle the correct
amount of airflow for either heating only or heating and air
conditioning.
Insulation
1. Insulate ductwork installed in attics or other areas exposed
to outside temperatures with a minimum of 2" (50.8 mm)
insulation and vapor barrier.
2. Insulate ductwork in indoor unconditioned areas with a
minimum of 1" (25.4 mm) insulation with indoor type va-
por barrier.
Filters
A Filter must be used:
Filters are not supplied with these furnaces, but can be purchased
from the distributor.
Use either filter type:
Washable, high velocity filters are based on a maximum
S
air flow rating of 600 FPM.
Disposable, low velocity filters are based on a maxim-
S
um air flow of 300 FPM when used with filter grille.
See Circulating Air Blower Data for additional data.
S
NOTE: Disposable, low velocity filters may be replaced with
washable, high velocity filter providing they meet the minimum
size areas. Washable, high velocity filters can be replaced ONLY
with same type and size.
Fig. 39 - - Side Mounted Filter Rack
Filter Installation using Optional Filter Rack
When installing or removing a bottom mounted filter, slide the
two side filter clips to the back of the furnace BEFORE installing
or removing. This will allow the filter to clear the front raised
edge of the furnace. Insert filter into side clips first and push filter
back until it is fully engaged into back clip. When filter is in
place, slide clips back into place midway on filter as shown in
Fig. 40 and Fig. 41.
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