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5594752-UIM-C-1119
INSPECTION
As soon as a unit is received, it should be inspected for possible dam-
age during transit. If damage is evident, the extent of the damage
should be noted on the carrier's freight bill. A separate request for
inspection by the carrier's agent should be made in writing. Also, before
installation, the unit should be checked for screws or bolts which may
have loosened in transit. There are no shipping or spacer brackets
which need to be removed from the interior of this unit.
FURNACE LOCATION AND CLEARANCES
The furnace shall be located using the following guidelines:
1. Where a minimum amount of air intake/vent piping and elbows will
be required.
2. As centralized with the air distribution as possible.
3. Where adequate combustion air will be available (particularly when
the appliance is not using outdoor combustion air).
4. Where it will not interfere with proper air circulation in the confined
space.
Installation in freezing temperatures:
1. Furnace shall be installed in an area where ventilation facilities pro-
vide for safe limits of ambient temperature under normal operating
conditions.
Table 1: Unit Clearances to Combustibles (All Dimensions in Inches and cm, and All Surfaces Identified with the Unit in an Upflow Configuration)
Top
Application
In. (cm)
Upflow
1 (2.5)
Upflow B-Vent
1 (2.5)
Downflow
1 (2.5)
Downflow B-Vent
1 (2.5)
Horizontal
1 (2.5)
Horizontal B-Vent
1 (2.5)
1. Special floor base or air conditioning coil required for use on combustible floor.
2. Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal position) of the furnace jacket and building
joists, studs or framing.
SECTION II: DUCTWORK
DUCTWORK GENERAL INFORMATION
The duct system's design and installation must:
1. Handle an air volume appropriate for the served space and within
the operating parameters of the furnace specifications.
2. Be installed in accordance of National Fire Protection Association
as outlined in NFPA standard 90B (latest editions) or applicable
national, provincial, state, and local fire and safety codes.
3. Create a closed duct system. For residential and non-HUD Modular
Home installations, when a furnace is installed so that the supply
ducts carry air circulated by the furnace to areas outside the space
containing the furnace, the return air shall also be handled by a
duct(s) sealed to the furnace casing and terminating outside the
space containing the furnace.
4. Complete a path for heated or cooled air to circulate through the air
conditioning and heating equipment and to and from the condi-
tioned space.
CAUTION
!
The indoor coil must be installed in the supply air duct, downstream of
the furnace. Cooled air may not be passed over the heat exchanger.
4
Left
Front
Rear
Side
In. (cm)
In. (cm)
In. (cm)
1 (2.5)
0 (0.0)
0 (0.0)
1 (2.5)
0 (0.0)
0 (0.0)
1 (2.5)
0 (0.0)
0 (0.0)
1 (2.5)
0 (0.0)
0 (0.0)
1 (2.5)
0 (0.0)
0 (0.0)
1 (2.5)
0 (0.0)
0 (0.0)
!
Improper installation in an ambient below 32ºF (0ºC) could create a
hazard, resulting in damage, injury or death.
2. Do not allow return air temperature to be below 55ºF (13ºC) for
extended periods. To do so may cause condensation to occur in the
main heat exchanger, leading to premature heat exchanger failure.
Clearances for access/service:
Ample clearances should be provided to permit easy access to the unit.
The following minimum clearances are recommended:
1. Twenty-four (24) inches (61 cm) between the front of the furnace
and an adjacent wall or another appliance, when access is required
for servicing and cleaning.
2. Eighteen (18) inches (46 cm) at the side where access is required
for passage to the front when servicing or for inspection or replace-
ment of flue/vent connections.
In all cases, accessibility clearances shall take precedence over clear-
ances for combustible materials where accessibility clearances are
greater.
Installation in a residential garage:
A gas-fired furnace for installation in a residential garage must be
installed so the burner(s) and the ignition source are located not less
than 18" (46 cm) above the floor, and the furnace must be located or
protected to avoid physical damage by vehicles.
Right
Flue
Floor/
Side
Bottom
In. (cm)
In. (cm)
0 (0.0)
6 (15.2)
Combustible
0 (0.0)
1 (2.5)
Combustible
0 (0.0)
6 (15.2)
1 (25.4)
0 (0.0)
1 (2.5)
1 (25.4)
0 (0.0)
6 (15.2)
Combustible
0 (0.0)
1 (2.5)
Combustible
When the furnace is used with an indoor coil, the coil must be installed
parallel with, or in the supply air side of the furnace to avoid condensa-
tion in the primary heat exchanger. When a parallel flow arrangement is
used, dampers or other means used to control airflow must be ade-
quate to prevent chilled air from entering the furnace. If manually oper-
ated, the damper must be equipped with means to prevent the furnace
or the air conditioner from operating unless the damper is in full heat or
cool position.
When replacing an existing furnace, if the existing plenum is not the
same size as the new furnace then the existing plenum must be
removed and a new plenum installed that is the proper size for the new
furnace. If the plenum is shorter than 12" (30.5 cm) the turbulent air flow
may cause the limit controls not to operate as designed, or the limit con-
trols may not operate at all.
The duct system is a very important part of the installation. If the duct
system is improperly sized the furnace will not operate properly.
The ducts attached to the furnace plenum, should be of sufficient size
so that the furnace operates at the specified external static pressure
and within the air temperature rise specified on the nameplate.
IMPORTANT: The minimum plenum height is 12" (30.5 cm). The fur-
nace will not operate properly on a shorter plenum height. The mini-
mum recommended rectangular duct height is 4" (10.1 cm) attached
to the plenum.
WARNING
Closet
Alcove
Attic
Yes
Yes
Yes
Yes
Yes
Yes
1
Yes
Yes
Yes
1
Yes
Yes
Yes
No
Yes
Yes
No
Yes
Yes
Johnson Controls Ducted Systems
Line
Contact
No
No
No
No
2
Yes
2
Yes
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