5
441 01 5003 01
Specifications are subject to change without notice
•
The air temperature rise is within the rated rise range on the
furnace rating plate, and the firing rate has been set to the
rating plate value.
•
The filters used to clean the circulating air during the
construction process must be either changed or thoroughly
cleaned prior to occupancy.
•
The furnace, ductwork and filters are cleaned as necessary to
remove drywall dust and construction debris from all HVAC
system components after construction is completed.
•
Verify proper furnace operating conditions including ignition,
gas input rate, air temperature rise, and venting according to
these installation instructions.
MINIMUM CLEARANCES TO COMBUSTIBLE
MATERIALS FOR ALL MODELS
REAR
0
FRONT (combustion air openings
in furnace and structure)
3
″
(76mm)
Required For Service
*
24
″
(610mm)
ALL SIDES Of SUPPLY PLENUM
1
″
(25.4mm)
SIDES
0
VENT
Single--Wall Vent
6
″
(152mm)
Type B--1 Double Wall Vent
1
″
(25.4mm)
TOP OF FURNACE
1
″
(25.4mm)
*
30
″
(762 mm)
clearance recommended for casing removal.
Horizontal position: Line contact is permissible only between lines
formed by intersections of top and two sides of furnace jacket, and
building joists, studs or framing.
DIMENSIONAL INFORMATION
Furnace
Capacity
Cabinet
Top
Bottom
Return Air
Opening
A
B
F
C
D
H8UH5050/075B12
MUF050/075W3C
HL12/18H3TRC
15
1
/
2
(394)
14
(356)
6
(152)
1
3
/
8
(35)
12
5
/
8
(321)
H
H8UH5100F14
MUF100W3C
HL25H3TRC
19
1
/
8
(486)
17
5
/
8
(447)
7
3
/
4
(197)
2
1
/
8
(54)
14
3
/
4
(375)
J
H8UH5125/140J20
MUF125/140W5C
HL31H4TRC
HL34H5TRC
22
3
/
4
(578)
21
1
/
4
(540)
9
1
/
2
(241)
1
15
/
16
(49)
18
3
/
4
(476)
J
Installation Positions
This furnace can be installed in an upflow, horizontal (either left or
right) airflow position. DO NOT install this furnace on its back. For
the upflow position, the return air ductwork can be attached to either
the left or right side panel and/or the bottom. For horizontal position,
the return air ductwork must be attached to the bottom. The return
air ductwork must
never
be attached to the back of the furnace.
Furnace Installation
Inspect the rating plate to be certain the model number begins with
“H8UH5”, “MUF”
, or
“HL”
. This identifies the furnace as a
multi--position furnace and can be Installed in an Upflow, Horizontal
Right or Horizontal Left position. This furnace is NOT approved to
be installed in the downflow position.
5
1
/
3
(135mm)
4
1
/
16
(103mm)
38
(965mm)
32
1
/
2
(826mm)
27
7
/
8
(708mm)
17
5
/
16
(440mm)
3
3
/
4
(95mm)
1
1
/
2
(38mm)
2
1
/
4
(57mm)
4
7
/
8
(124mm)
33
1
/
2
(851mm)
30
3
/
4
(781mm)
17
5
/
16
(440mm)
29
1
/
2
(749mm)
2 (51mm)
3
3
/
4
(92mm)
4
7
/
8
(124mm)
2
1
/
4
(57mm)
1
7
/
8
(48mm)
RIGHT SIDE
28
1
/
2
(724mm)
18
1
/
2
(470mm)
40
(1016mm)
TOP
F
LEFT SIDE
FRONT
A
B
BOTTOM
D
C
H
*24
″
MIN.
(610mm MIN.)
KO starting
hole to cut side
duct opening
13
1
/
4
(337mm)
21
3
/
4
(552mm)
26
5
/
8
(676mm)
37
(940mm)
13
1
/
4
(337mm)
21
3
/
4
(552mm)
26
5
/
8
(676mm)
1
7
/
8
(48mm)
7
(178 mm)
1(25.4 mm)
5
(127mm)
27
1
/
2
(698mm)
23
1
/
8
(587mm)
J
Dimensions and Clearances (H8UH5, MUF, HL Models)
Figure 1
Drawing is representative.
Some models may vary
DIMENSIONS IN INCHES (mm)
KNOCK--OUT = KO
NOTE:
Evaporator “A” coil drain pan dimensions may
vary from furnace duct opening size. Always consult
evaporator specifications for duct size requirements.
Furnace is designed for bottom return or side return.
Return air through back of furnace is NOT allowed.
KO starting
hole to cut side
duct opening
1
1
/
2
(38mm)
1 (25.4 mm)
7
(178 mmm)
3
/
4
(19 mm)
