PG92MSA: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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A170123
Fig. 24 – Removing Bottom Closure Panel (2 Screws)
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. This panel MUST be in place when only side return
air is used. Where required by code, seal bottom closure to furnace with
tape, mastic or other durable sealing method.
Side return-air openings can only be used in UPFLOW
configurations. Do not use side return-air openings in
DOWNFLOW or HORIZONTAL configurations. See Fig. 22, Fig. 23,
and Fig. 24.
Downflow Installation
NOTE: The furnace must be pitched as shown in Fig. 19 for proper
condensate drainage.
Supply Air Connections
NOTE: For downflow applications, this furnace is approved for use on
combustible flooring when any one of the following three accessories
are used:
• Manufacturer’s approved downflow combustible floor subbase
• Manufacturer’s approved cased evaporator coil
• Manufacturer’s approved evaporator coil casing
1. Determine application being installed from Table 6.
2. Construct hole in floor per Table 6 and Fig. 25.
3. Construct plenum to dimensions specified in Table 6 and Fig. 25.
4. If downflow subbase is used, install as shown. If manufacturer’s
cased evaporator coil or coil casing is used, install as shown in
Fig. 25.
NOTE: It is recommended that the perforated supply-air duct flanges be
completely removed from furnace when installing the furnace on a
factory-supplied cased coil or coil box. To remove the supply-air duct
flange, use wide duct pliers or hand seamers to bend flange back and
forth until it breaks off. Be careful of sharp edges. See Fig. 20.
Connect supply-air duct to supply-air outlet on furnace. Bend flange
inward past 90° with wide duct pliers See Fig. 20. The supply-air duct
must be connected to ONLY the furnace supply outlet or air conditioning
coil casing (when used). When installed on combustible material,
supply-air duct must be connected to ONLY the factory-approved
accessory subbase, or a factory-approved air conditioning coil casing.
DO NOT cut main furnace casing to attach supply side air duct,
humidifier, or other accessories. All supply-side accessories MUST be
connected to duct external to furnace casing.
Return Air Connections
The return-air duct must be connected to return-air opening (bottom
inlet). DO NOT cut into casing sides (left or right). Bypass humidifier
connections should be made at ductwork or coil casing sides exterior to
furnace. See Fig. 22.
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. Remove and discard this panel when bottom return
air is used. To remove bottom closure panel, see Fig. 24.
Horizontal Installation
NOTE: The furnace must be pitched forward as shown in Fig. 19 for
proper condensate drainage.
The furnace can be installed horizontally in an attic or crawlspace on
either the left-hand (LH) or right-hand (RH) side. The furnace can be
CAUTION
!
EQUIPMENT OR PROPERTY DAMAGE
Failure to follow this caution could result in equipment or property
damage
When furnace is installed in a downflow application, make sure water
lines and other sources of water cannot drip or fail in such a way that
water can collect on the blower motor, wiring, and furnace control
board.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts, and servicing furnaces.
WARNING
!
FIRE HAZARD
A failure to follow this warning could cause personal injury, death
and/or property damage.
Never connect return-air ducts to the back of the furnace. Follow
instructions below.
WARNING
!
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
Do not install the furnace on its back or hang furnace with control
compartment facing downward. Safety control operation will be
adversely affected. Never connect return-air ducts to the back of the
furnace.
CAUTION
!
MINOR PROPERTY HAZARD
Failure to follow this caution may result in minor property damage.
Local codes may require a drain pan under entire furnace and
condensate trap when a condensing furnace is used in an attic
application or over a finished ceiling.
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