987158-UIM-B-1013
4
Johnson Controls Unitary Products
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.
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.
2. Do not allow return air temperature to be below 55º F (13° C) 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 inches (46 cm) above the floor, and the furnace must be located
or protected to avoid physical damage by vehicles.
FOR FURNACES INSTALLED IN THE COMMON-
WEALTH OF MASSACHUSETTS ONLY
For all side wall horizontally vented gas fueled equipment installed in
every dwelling, building or structure used in whole or in part for resi-
dential purposes, including those owned or operated by the Com-
monwealth and where the side wall exhaust vent termination is less
than seven (7) feet above finished grade in the area of the venting,
including but not limited to decks and porches, the following require-
ments shall be satisfied:
1.
INSTALLATION OF CARBON MONOXIDE DETECTORS.
At the
time of installation of the side wall horizontal vented gas fueled
equipment, the installing plumber or gasfitter shall observe that a
hard wired carbon monoxide detector with an alarm and battery
back-up is installed on the floor level where the gas equipment is
to be installed. In addition, the installing plumber or gasfitter shall
observe that a battery operated or hard wired carbon monoxide
detector with an alarm is installed on each additional level of the
dwelling, building or structure served by the side wall horizontal
vented gas fueled equipment. It shall be the responsibility of the
property owner to secure the services of qualified licensed profes-
sionals for the installation of hard wired carbon monoxide detec-
tors
a. In the event that the side wall horizontally vented gas fueled
equipment is installed in a crawl space or an attic, the hard
wired carbon monoxide detector with alarm and battery back-
up may be installed on the next adjacent floor level.
b. In the event that the requirements of this subdivision can not
be met at the time of completion of installation, the owner shall
have a period of thirty (30) days to comply with the above
requirements; provided, however, that during said thirty (30)
day period, a battery operated carbon monoxide detector with
an alarm shall be installed.
2.
APPROVED CARBON MONOXIDE DETECTORS.
Each carbon
monoxide detector as required in accordance with the above pro-
visions shall comply with NFPA 720 and be ANSI/UL 2034 listed
and IAS certified.
3.
SIGNAGE.
A metal or plastic identification plate shall be perma-
nently mounted to the exterior of the building at a minimum height
of eight (8) feet above grade directly in line with the exhaust vent
terminal for the horizontally vented gas fueled heating appliance
or equipment. The sign shall read, in print size no less than one-
half (1/2) inch in size, “
GAS VENT DIRECTLY BELOW. KEEP
CLEAR OF ALL OBSTRUCTIONS”
.
4.
INSPECTION.
The state or local gas inspector of the side wall
horizontally vented gas fueled equipment shall not approve the
installation unless, upon inspection, the inspector observes car-
bon monoxide detectors and signage installed in accordance with
the provisions of 248 CMR 5.08(2)(a)1 through 4.
Table 1:
Unit Clearances to Combustibles (All Dimensions in Inches, and All Surfaces Identified with the Unit in an Upflow Configuration)
Application
Top
Front
Rear
Left Side
Right Side
Flue
Floor/
Bottom
Closet
Alcove
Attic
Line
Contact
In. (cm)
In. (cm)
In. (cm)
In. (cm)
In. (cm)
In. (cm)
Upflow B-Vent
1 (2.5)
1 (2.5)
0 (0.0)
0 (0.0)
0 (0.0)
1 (2.5)
Combustible
Yes
Yes
Yes
No
Downflow B-Vent
1 (2.5)
1 (2.5)
0 (0.0)
0 (0.0)
0 (0.0)
1 (2.5)
1 (25.4)
1
1. Special floor base or air conditioning coil required for use on combustible floor.
Yes
Yes
Yes
No
Horizontal B-Vent
1 (2.5)
1 (2.5)
0 (0.0)
0 (0.0)
0 (0.0)
1 (2.5)
Combustible
No
Yes
Yes
Yes
2
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.
