Table of Contents
Advertisement
2. Installation
Poison carbon monoxide gas hazard.
If this furnace is replacing a previously common-vented
furnace, it may be necessary to resize the existing vent
line and chimney to prevent oversizing problems for the
other remaining
appliances(s).
See applicable
codes
and Venting and Combustion Air Check in Gas Vent
Installation
section.
Failu re to properly vent this furnace or other appliances
can result in death, personal
injury and/or property
damage.
Locationand Clearances
If furnace
is a replacement,
it is usually
best to install the furnace
where the old one was. Choose
the location
or evaluate
the exist-
ing location
based
upon the minimum
clearance
and furnace
di-
mensions
(Figure
1, Figure
2 and Figure
3).
CAUTION
Do NOT operate furnace in a corrosive atmosphere contain-
ing chlorine, fluorine or any other damaging chemicals. Re-
fer to Combustion & Ventilation Air section, Contaminated
Combustion Air.
Dimensions and Clearances (Upflow/Horizontal
NTG3/NTN3 &FBF/NBF)
" rain.
25-22-28
MINIMUM
CLEARANCES
TO COMBUSTIBLE
MATERIALS
FOR ALL
UNITS
REAR
0
FRONT
3" *
Recommended
For Service
30"
ALL SIDES Of SUPPLY PLENUM
1"
SIDES
0
VENT
Single Wall Vent
6"
Type B-1 Double Wall Vent
1"
TOP OF FURNACE
1"
* 6" with accessory
Masonry Chimney drafthood kit installed
Drawing is representative
some models may vary
DIMENSIONAL INFORMATION
Unit
Capacity
NTG31NTN3
FBF/NBF
A
50FB / 050B12
40
75FB / 075B12
75HF/075F16
40
100KF/ 100F20
100KJ/100J20
40
125KJ/125J20
Cabinet
B
C
151/2
281/2
191/8
281/2
223/4
281/2
Electrical Connections
Top
Left/RightSide
LowVolt
D
E
D
E
R
P
11/2
11/2
15/8
11/2
41/2
175/16
11/2
11/2
15/8
11/2
41/2
175/16
11/2
11/2
15/8
11/2
41/2
175/16
SupplyAir
O
N
181/2
14
181/2
175/8
181/2
211/4
Return Air
Bottom
Side
F
G
J
R
231/8 125/8 221/2 121/4
23t/8
143/4 221/2 141/2
231/8 183/4 221/2 141/2
Gas Connections
Right Side
Left Side
M
K
L
K
237/8 281/4
26
28t/4
237/8 281/4
26
28t/4
237/8 281/4
26
281/4
441 012603 02
Hide quick links:
Advertisement
Table of Contents
