035-14527-000 REV A (599)
Form 650.77-N3U
4
Unitary Products Group
Check the rating plate and power supply to be sure that elec-
trical characteristics match. All models use nominal 115 vac,
1phase, 60 Hz. power supply.
A furnace installed in a residential garage must be located so
that all burners and burner ignition devices are located no
less than 18" above the garage floor, and located or pro-
tected to prevent damage by vehicles.
The size of the unit should be based on an acceptable heat
loss calculation for the structure. ACCA, Manual J or other
approved methods may be used.
The furnace should be located using these guidelines:
1.
Where a minimum amount of 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.
In an area where ventilation facilities provide for safe lim-
its of ambient temperature under normal operating con-
ditions.
5.
Where it will not interfere with proper air circulation in the
confined space.
6.
Where the vent will not be blocked or restricted.
7.
Where sufficient space is provided to allow proper ser-
vice access. Minimum recommended service clearances
are as follows:
•
Twenty-four (24) inches between the front of the fur-
nace and an adjacent wall or another appliance,
when access is required for servicing and cleaning.
•
Eighteen (18) inches at the side where access is
required for passage to the front when servicing or
for inspection or replacement of flue/vent connec-
tions.
8.
Where it will not interfere with the cleaning, servicing or
removal of other appliances.
9.
Where the following minimum clearances (in inches) to
combustibles can be maintained: (Refer to Table1 on
page4).
TABLE 1: UNIT CLEARANCES TO COMBUSTIBLES
UPFLOW / HORIZONTAL MODELS - (P*DU & G8D—UH)
APPLICATION
TOP
FRONT REAR
LEFT
SIDE
RIGHT
SIDE
FLUE
FLOOR/
BOTTOM
CLOSET ALCOVE
ATTIC
LINE
CONTACT
UPFLOW
1
6
0
0
3
1
6
COMBUSTIBLE
YES
YES
YES
N O
UPFLOW
B-VENT
1
3
0
0
0
1
COMBUSTIBLE
YES
YES
YES
N O
HORIZONTAL
3
2
6
0
1
0
6
COMBUSTIBLE
N O
YES
YES
YES
3
HORIZONTAL
B-VENT
0
3
0
1
0
1
COMBUSTIBLE
N O
YES
YES
Y E S
3
DOWNFLOW MODELS (P&DD & G8D—DN)
APPLICATION
TOP
FRONT REAR
LEFT
SIDE
RIGHT
SIDE
FLUE
FLOOR/
BOTTOM
CLOSET ALCOVE
ATTIC
LINE
CONTACT
DOWNFLOW
1
6
0
0
3
1
6
1"
4
YES
YES
YES
N O
DOWNFLOW
B-VENT
1
3
0
0
0
1
1"
4
YES
YES
YES
N O
1.
14-1/2” cabinet models only - all other units “0” clearance
2.
14-1/2” cabinet left airflow applications only - all other units and all right hand air flow applications “0” clearance.
3.
Special floor base or air conditioning coil required for use on combustible floor.
4.
Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal positio n)
of the furnace jacket and building joists, studs or framing.
