Installation - International comfort products R9MSB0801716 Installation Instructions Manual

INSTALLATION INSTRUCTIONS
NOTE: Trap grommet is required only for direct-vent
applications.
Figure 17 − Accessory Horizontal Drain Trap Grommet
FORMED END
OF GROMMET
CUT OFF FORMED END
FROM CONDENSATE
DRAIN ELBOW
CONNECT SHORT END OF
'Z' PIPE TO MODIFIED
DRAIN ELBOW
FACTORY SUPPLIED
1/2−IN. CPVC TO 3/4−IN.
PVC ADAPTER
DRAIN ELBOW "Z" DISCHARGE PIPE FOR LEFT SIDE
DRAIN IS ROUTED BEHIND INDUCER
FORMED END OF GROMMET. OPEN
SPRING CLAMP, INSERT 1/2−IN. TO 3/4−IN.
CPVC TO PVC ADAPTER OR CPVC PIPE
MODIFIED DRAIN ELBOW CON-
NECT TO CONDENSATE TRAP
AND 'Z' PIPE
FRONT VIEW
LEFT SIDE DRAIN PIPE ORIENTATION FOR CONDENSATE DISCHARGE
NOTE: Remove Inducer Housing for easier access, if desired.
Figure 18 − Drain Trap Connection and Routing
(Appearance May Vary)

INSTALLATION

NOTICE
Cabinet air leakage is less than 2% at 1.0 in. W.C. Cabinet
air leakage is less than 1.4% at 0.5 in. W.C. when tested in
accordance with ASHRAE Standard 193.
Upflow Installation
NOTE: The furnace must be pitched as shown in Figure 26 for
proper condensate drainage.
440 01 6001 05
Remove knockout.
Install grommet before
relocating condensate
trap.
A11582
ATTACH ELBOW TO
CONDENSATE TRAP
TOP VIEW
A170128
L12F015
Specifications subject to change without notice.
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream. The cover attachment shall prevent
leaks.
Connect supply−air duct to flanges on furnace supply−air
outlet. Bend flange upward to 90_ with wide duct pliers. (See
Figure 22.) The supply−air duct must be connected to ONLY
the furnace supply−outlet−air duct flanges or air conditioning
coil casing (when used). DO NOT cut main furnace casing side
to attach supply air duct, humidifier, or other accessories. All
supply−side accessories MUST be connected to duct external
to furnace main casing.
Return Air Connections
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.
The return−air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing. Bypass humidifier may be attached into unused return
air side of the furnace casing. (See Figure 27, Figure 28,
Figure 29.)
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 Figure 24 and Figure 25.
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.
NOTE: Side return−air openings can be used in UPFLOW and
some HORIZONTAL configurations. Do not use side return−air
openings in DOWNFLOW configuration.
Figure 28, Figure 29.)
Leveling Legs (If Desired)
In upflow position with side return inlet(s), leveling legs may be
used. (See Figure 23.) Install field−supplied, 5/16 x 1−1/2 in. (8
x 38 mm) (max) corrosion−resistant machine bolts, washers
and nuts.
NOTE: Bottom closure must be used when leveling legs are
used. It may be necessary to remove and reinstall bottom
closure panel to install leveling legs. To remove bottom closure
panel, see Figure 24 and Figure 25.
To install leveling legs:
1. Position furnace on its back. Locate and drill a hole in
each bottom corner of furnace.
2. For each leg, install nut on bolt and then install bolt with
nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install
flat washer if desired.)
Gas Furnace: R9MSB
(See Figure 27,
21