N92ESN: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
43
A13074
Fig. 57 – Vent Coupling and Adapter with Gaskets
Near Furnace Vent Connections
Offsets in the vertical portion of the vent pipe should be made with 45
deg. elbows instead of 90 deg. elbows. Short horizontal runs of vent pipe
are difficult to pitch correctly and may trap water in the vent pipe.
Trapped water in the vent pipe may result in nuisance pressure switch
tripping.
Install the Vent and Combustion Air Pipes
With the furnace installed in the required position, remove the desired
knockouts from the casing. It will be necessary to remove one knockout
for the vent pipe and the other knockout for the combustion air
connection. See
Use a flat blade screwdriver and tap on the knockout on opposite sides,
where the knockout meets the casing. Fold the knockout down with duct
pliers and work the knockout back and forth until it is removed. Trim
any excess metal from the knockout with tin snips.
The vent elbow can be rotated to the required location on the casing if
necessary. See
. To rotate the vent elbow:
1. Loosen the clamp on the inlet of the vent elbow attached to the
inducer.
2. Rotate the vent elbow to the required position. There are rounded
notches on the vent elbow to align it with the inducer housing for
each orientation.
3. Tighten the clamp around the vent elbow. Torque the clamp to 15
lb-in. See
Installing the Vent Pipe Adapter and Combustion Air
Pipe Adapter
NOTE:
The rubber coupling that attaches to the vent pipe adapter must
be used. The adapter seals the vent pipe to the casing and reduces the
strain on the vent elbow attached to the inducer.
1. Apply the gaskets to the vent pipe and combustion air pipe
adapters. If supplied, remove and discard round center “slug” from
NOTE:
The vent pipe adapter can be distinguished from the inlet pipe
adapter by the absence of an internal pipe-stopping ring. The vent pipe
can pass through the vent pipe adapter; it cannot pass through the inlet
pipe adapter.
2. Align the screw holes in the plastic vent pipe adapter with the
dimples in the casing.
Winter
Design
Temp
°C
Unit Size
80,000 BTUH
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia.
mm
38
51
64
76
102
38
51
64
76
102
38
51
64
76
102
-7
4.6
12.2
12.2
10.7
9.1
4.6
15.2
27.4
22.9
19.8
4.6
15.2
21.3
21.3
21.3
-18
4.6
6.1
4.6
3.0
1.5
4.6
15.2
13.7
10.7
9.1
4.6
15.2
15.2
12.2
10.7
-29
4.6
3.0
1.5
4.6
10.7
9.1
6.1
4.6
4.6
12.2
9.1
7.6
4.6
-40
3.0
1.5
4.6
7.6
6.1
4.6
1.5
4.6
9.1
7.6
6.1
3.0
Winter
Design
Temp
°C
Unit Size
100,000 BTUH
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia.
mm
51
64
76
102
51
64
76
102
51
64
76
102
-7
6.1
15.2
12.2
10.7
6.1
24.4
28.9
24.4
6.1
24.4
32.0
27.4
-18
6.1
6.1
4.6
3.0
6.1
16.8
13.7
10.7
6.1
19.8
16.7
13.7
-29
4.6
3.0
1.5
6.1
10.7
9.1
6.1
6.1
13.7
10.7
7.6
-40
3.0
1.5
6.1
7.6
6.1
3.0
6.1
9.1
7.6
4.6
Winter
Design
Temp
°C
Unit Size
120,000 BTUH
140,000 BTUH
Uninsulated
3/8-in. Insulation 1/2-in. Insulation
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia.
mm
64
76
102
64
76
102
64
76
102
64
76
102
64
76
102
64
76
102
-7
3.0
15.2 12.2
3.0
22.9 28.9
3.0
22.9 32.0
1.5
16.7 15.2
1.5
19.8 32.0
1.5
19.8 38.1
-18
3.0
6.1
4.6
3.0
16.8 13.7
3.0
19.8 15.2
1.5
7.6
4.6
1.5
19.8 15.2
1.5
19.8 18.3
-29
3.0
3.0
3.0
10.7
7.6
3.0
13.7
9.1
1.5
3.0
1.5
1.5
13.7
9.1
1.5
15.2 12.2
-40
3.0
1.5
3.0
7.6
4.6
3.0
9.1
6.1
1.5
1.5
1.5
9.1
6.1
1.5
35
7.6
Attach gaskets to vent pipe and
combustion air adapters.
Vent Coupling and Adapter
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
DO NOT
use cement to join polypropylene venting systems. Follow
the polypropylene venting system manufacturer’s instructions for
installing polypropylene venting systems.
CAUTION
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
To route the vent pipe and combustion air pipe through the furnace, the
manufacturer supplied kit must be used. Failure to properly seal the
blower compartment from the furnace vestibule could result in the
circulation of carbon monoxide throughout the structure. The vent pipe
and combustion air pipe must be a continuous pipe while passing
through the blower compartment. Seals supplied in this kit must be
installed per the instructions provided. Follow all procedures outlined
in these instructions.
