International comfort products C9MPX Installation Instructions Manual page 42

Figure 46
Standoff Filter Rack
Using Optional
Standoff Filter
Rack
Addition Of Air Conditioning
When a refrigeration coil is used in conjunction with this unit, it must
be installed parallel with or on the discharge side of the unit to avoid
condensation on the heat exchanger. All furnaces are designed
with a break−away duct flange on the supply air side of the furnace.
This allows for installation in the horizontal right or downflow
applications. The coil installation instructions must be consulted
for proper coil location and installation procedures. With a parallel
flow arrangement, dampers must be installed to prevent chilled air
from entering the furnace. If manually operated dampers are used,
they must be equipped with a means to prevent operation of either
unit unless the damper is in full heat or full cool position.
A 3" clearance is required on the right side of the furnace in order to
run the condensate drain line. Copper or plastic tubing may be
used for the condensate drain line.
Downflow Furnace Installation
Non-Combustible Floor Installation
Fabricate a plenum to the dimensions given in Figure 4, for the
furnace outlet. Plenum should be flanged, approximately
(19.1mm)for support.
Note: The three(3) screws in the top panel of the furnace next to the
duct flange MUST be removed to provide serviceability of the
primary heat exchangers in the downflow installation
1. Position plenum through the floor and set the furnace over
the opening in the floor. If necessary, grout around the base
to seal air leaks between the base and the floor.
Table 8 Subbases for Combustible Floors Dimensions − in(mm)
Sub−base for
Combustible Floors
Part Number
Furnace Only
NAHH001SB
NAHH002SB
NAHH003SB
NAHH010SB
Subbase for Coil Box
NAHH004SB
NAHH005SB
NAHH006SB
NAHH009SB
*
Outside Dimension
**
Base Spacer Side To Side
Conversion: 1 in = 25.4 mm
42
25−21−45a
Sub−base for Combustible
Floor Dimensions
*
H J* K**
11 3 9
15 / 28 / 14 /
16 4 16
(398.5) (730.3) (369.9)
5 3 3
19 / 28 / 18 /
16 4 16
(490.5) (730.3) (462)
15 3 13
22 / 28 / 21 /
16 4 16
(582.6) (730.3) (554)
11 3 9
24 / 28 / 23 /
16 4 16
(627.1) (730.3) (598.5)
3 9 9
15 / 20 / 14 /
4 16 16
(25.4) (522.3) (369.9)
3 9 3
19 / 20 / 18 /
8 16 16
(181.1) (522.3) (462)
9 13
20 / 21 /
16 16
23 (284.2)
(522.3) (554)
3 9 9
24 / 20 / 23 /
4 16 16
(628.7) (522.3) (598.5)
Specifications are subject to change without notice.
Combustible Floor Installation
!
FIRE HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Place furnace on noncombustible subbase on
downflow applications, unless installing on
non−combustible flooring.
The noncombustible subbase also must be used
on downflow application sin addition to a coil box
installation.
Subbase for Combustible Floor
NOTE: The three(3) screws in the top panel of the furnace next to
the duct flange MUST be removed to provide serviceability of the
primary heat exchangers in the downflow installation
Note: When using the subbase for combustible floors, the
discharge air duct flanges on the furnace MUST be broken down to
provide proper fit up to the subbase. Use duct pliers to bend the
duct flanges flat onto the furnace casing. DO NOT bend the duct
flanges inward (toward the heat exchangers) as air flow restrictions
may occur.
The Subbase for Combustible Floors MUST be used when a
downflow furnace is set on a combustible floor, even when the
furnace is installed on a coil box.
1. Cut the opening in the floor according to Table 8. The hole in
the floor must be cut to the dimensions listed in Table 8
since the base is equipped with locating tabs that center the
base over the opening.
The opening in the base is 1
(28.6mm) narrower than the recommended size of the opening in
the floor. This is done to maintain clearance between the floor and
the plenum.
3
2. Fabricate the plenum to the dimensions given in Table 8.
/ "
4
Note that the dimensions given are outside dimensions.
3. Set the base over the opening in the floor, centering it over
the opening. Fasten the base to the floor with screws or
nails. See Figure 47, Figure 48 and Figure 49.
4. Drop the plenum through the opening in the base. The
flange of the plenum should rest on top of the subbase.
Opening In Floor
L M N
1 5
16 / 14 /
4 8
16(406.4)
(412.8) (371.5)
1 1
16 / 18 /
4 4
16(406.4)
(412.8) (463.6)
1 7
16 / 21 /
4 8
16(406.4)
(412.8) (555.6)
1 5
16 / 23 /
4 8
16(406.4)
(412.8) (600.1)
1 1 5
16 / 16 / 14 /
16 4 8
(408) (412.8) (371.5)
1 1 1
16 / 16 / 18 /
16 4 4
(408) (412.8) (463.6)
1 1 7
16 / 16 / 21 /
16 4 8
(408) (412.8) (555.6)
1 1 5
16 / 16 / 23 /
16 4 8
(408) (412.8) (600.1)
WARNING
1
/ " (31.8mm) shorter and 1
4
Opening In Typical Plenum
Base For Plenum Dimensions
P R S
1
13 /
2
15 (381) 15 (381)
(342.9)
1
17 /
8
15 (381) 15 (381)
(435.6)
3
19 /
4
15 (381) 15 (381)
(501.7)
1
22 /
2
15 (381) 15 (381)
(571.5)
1
13 /
2
15 (381) 15 (381)
(342.9)
1
17 /
8
15 (381) 15 (381)
(435.6)
3
19 /
4
15 (381) 15 (381)
(501.7)
1
22 /
2
15 (381) 15 (381)
(571.5)
1
/ "
8
T
1
13 /
2
(342.9)
1
17 /
8
(435.6)
3
19 /
4
(501.7)
1
22 /
2
(571.5)
1
13 /
2
342.9)
(
1
17 /
8
(435.6)
3
19 /
4
(501.7)
1
22 /
2
(571.5)
440 01 1051 02