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935SB: Installation, Start-up, Operating and Service Maintenance Instructions
Unit Size
40,000
Pipe Dia.
1 ½
2
(in)
0-2000
40
155 185
Altitude
2001-3000
35
150 175
(feet)
3001-4000
30
135 160
4001-4500
130 155
25
4501-5000
125 145
5001-5400
20
120 130
Pipe Diameter (in):
Mitered 90º Elbow
Medium Radius 90º Elbow
Long Radius 90º Elbow
Mitered 45º Elbow
Medium Radius 45º Elbow
Long Radius 45º Elbow
Tee
Concentric Vent Termination
Standard Vent Termination
NOTES:
1.Use only the smallest diameter pipe possible for venting. Over-sizing may cause flame disturbance or excessive vent terminal icing or freeze-up.
2.NA - Not
allowed. Pressure transducer
3.Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
4.Size both the combustion air and vent pipe independently, then use the larger size for both pipes.
5.Assume the two 45_ elbows equal one 90_ elbow. Wide radius elbows are desirable and may be required in some cases.
6.Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
7.The minimum pipe length is 5 ft. (2 M) linear feet (meters) for all applications.
8.Use 3-in. (76 mm) diameter vent termination kit for installations requiring 4-in. (102 mm) diameter pipe.
Combustion Air and Vent Piping Insulation
Guidelines
NOTE: Use closed cell, neoprene insulation or equivalent.
The vent pipe may pass through unconditioned areas. The amount of
exposed pipe allowed
(Table
18).
1. Using winter design temperature (used in load calculations), find
appropriate temperature for your application and furnace model.
2. Determine the amount of total and exposed vent pipe.
3. Determine required insulation thickness for exposed pipe length(s).
4. When combustion air inlet piping is installed above a suspended
ceiling, the pipe MUST be insulated with moisture resistant
insulation such as Armaflex or other equivalent type of insulation.
5. Insulate combustion air inlet piping when run in warm, humid
spaces.
6. Install the insulation per the insulation manufacturer's installation
instructions.
NOTE: Pipe length (ft. / M) specified for maximum pipe lengths located
in unconditioned spaces cannot exceed total allowable pipe length as
calculated
(Table
16).
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 16 – Maximum Equivalent Vent Length - Ft.
60,000
2 ½
1 ½
2
2 ½
100
175
20
95
165
16
90
155
85
150
15
80
145
75
140
Table 17 – Deductions from Maximum Equivalent Vent Length - Ft. (M)
1-1/2
8
(2.4)
5
(1.5)
3
(0.9)
4
(1.2)
2.5
(0.8)
1.5
(0.5)
16
(4.9)
NA
0
(0.0)
will not close, or flame disturbance may result.
80,000
3
1 ½
2
2 ½
200
15
55
130
185
125
49
175
115
170
10
44
110
165
44
110
155
41
100
2
2-1/2
8
(2.4)
8
5
(1.5)
5
3
(0.9)
3
4
(1.2)
4
2.5
(0.8)
2.5
1.5
(0.5)
1.5
16
(4.9)
16
0
(0.0)
NA
0
(0.0)
0
Configure the Furnace
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.
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 faults.
37
100,000
3
4
2
2 ½
175
200
20
80
165
185
15
75
155
175
150
165
70
145
160
10
65
135
150
3
(2.4)
8
(2.4)
(1.5)
5
(1.5)
(0.9)
3
(0.9)
(1.2)
4
(1.2)
(0.8)
2.5
(0.8)
(0.5)
1.5
(0.5)
(4.9)
16
(4.9)
0
(0.0)
(0.0)
0
(0.0)
WARNING
!
3
4
175
200
165
185
175
155
170
150
165
140
155
A13110
4
8
(2.4)
5
(1.5)
3
(0.9)
4
(1.2)
2.5
(0.8)
1.5
(0.5)
16
(4.9)
NA
0
(0.0)
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