Bryant 926TC Installation, Start-Up, Operating And Service And Maintenance Instructions page 40

926TC: Installation, Start-up, Operating and Service and Maintenance Instructions
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ADDITIONAL INFORMATION
VENTING SYSTEMS
Polypropylene venting systems include flexible vent pipe. These
flexible vent pipes have a different equivalent vent length than straight
sections of PVC/ABS DWV vent pipe. Be sure to make the appropriate
deductions from the Maximum Equivalent Vent Length (MEVL), or
additions to the Total Equivalent Vent Length (TEVL), when applying
flexible vent pipes in polypropylene venting systems. See the
polypropylene vent system manufacturer's installation instructions for
details.
When using metric-sized venting systems, use these equivalencies for
obtaining the proper MEVL from the Tables:
Use 2" Vent Tables for 60 mm (o.d.) vent systems
Use 3" Vent Tables for 80 mm (o.d.) vent systems
Use 4" Vent Tables for 100 mm (o.d.) vent systems
NOTE: Polypropylene venting systems MAY require additional
deductions from the MEVL, or additions to the TEVL, for vent
terminations and flexible pipe sections. See the polypropylene venting
system manufacturer's instructions for details on equivalent lengths of
vent terminations and flexible vent pipes, and for calculating total vent
lengths.
To calculate the Total Equivalent Vent Length (TEVL) of the venting
system:
1. Measure the individual distance from the furnace to the termination
for each pipe.
2. Count the number of elbows for each pipe.
3. For each pipe, multiply the number of elbows by the equivalent
length for the type of elbow used. Record the equivalent length of
all the elbows for each pipe.
4. If a Tee is used on the termination (Alberta and Saskatchewan,
when required) record the equivalent length of the Tee used.
NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows. Use
Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
Unit Size 40,000
Pipe Dia.
1 ½
(in)
0-2000 40
2001-3000 35
3001-4000 30
Altitude
4001-4500
25
(feet)
4501-5000
5001-6000 20
6001-7000 15
7001-8000
10
8001-9000
9001-10000 5
Unit Size 40,000
Pipe Dia.
38
(mm)
0-610 12.1
611-914 10.6
915-1219 9.1
Altitude
1220-1370
7.6
(meters)
1371-1524
1525-1829 6.0
1830-2134 4.5
2135-2438
3.0
2439-2743
2744-3048 1.5
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
NOTICE
FOR POLYPROPYLENE
Table 15 – Maximum Equivalent Vent Length - Ft.
1 2
60,000
2 2 ½ 1 ½ 2 2 ½
155 185 100 175
20
150 175 95 165
135 160 16 90 155
130 155 85 150
125 145 15 80 145
120 130 75 140
110 120 13 70 130
100 110 10 65 120
90 95 5 60 115
80 85 N/A 55 105
Maximum Equivalent Vent Length - Meters
1 2
60,000
51 64 38 51 64
47.2 56.3 30.4 53.3
6.0
45.7 53.3 28.9 50.2
41.1 48.7 4.8 27.4 47.2
39.6 47.2 25.9 45.7
38.1 44.1 4.5 24.3 44.1
36.5 39.6 22.8 42.6
33.5 36.5 3.9 21.3 39.6
30.4 33.5 3.0 19.8 36.5
27.4 28.9 1.5 18.2 35.0
24.3 25.9 NA 16.7 32.0
5. Calculate Total Equivalent Vent Length by adding the equivalent
lengths of the fittings to the lengths of the individual vent and
combustion air pipes.
6. When using polypropylene venting systems with flexible vent
pipes, perform adjustments for the equivalent length of the flexible
vent pipe to the calculated total equivalent venting system length.
See the polypropylene vent system manufacturer's instructions for
details.
7. Select a diameter of vent pipe from
Maximum Equivalent Vent Length (MEVL) shown for that
application for that specific furnace input size. Compare the Total
Equivalent Vent Length (TEVL) to the MEVL:
8. If the Total Equivalent Vent Length is shorter than the Maximum
Equivalent Vent Length for the diameter of pipe chosen, then that
diameter of pipe selected may be used.
9. If the Total Vent Length is longer than the Maximum Equivalent
Vent Length for the diameter of pipe chosen, that diameter pipe
MAY NOT be used for venting the furnace. Try the next larger
.
diameter pipe
NOTE: If the calculated Total Equivalent Vent Lengths results in
different diameter pipes for the vent and combustion air, select the larger
diameter for both pipes.
NOTE: If the Maximum Vent Length for diameter of the pipe selected
is longer than the measured length and the equivalent length of all the
fittings and terminations (TEVL), recalculate Total Equivalent Vent
Length using the next smaller diameter. If the Maximum Equivalent
Vent Length is still longer than the longer TEVL of the vent pipe or
combustion air pipe, then that diameter of pipe selected may be used.
When installing vent systems pipe lengths of 10 ft. (3 M) or less, use the
smallest allowable pipe diameter. Using a pipe size greater than required
for short venting systems may result in loss of efficiency, incomplete
combustion, flame disturbance, or flame sense lockout.
For vent systems longer than 10 ft. (3 M), any larger diameter vent pipe
shown in Table 15
80,000
3 1 ½ 2 2 ½ 3
200 15 55 130 175
185 125 165
49
175 115 155
170 10 150
44 110
165 145
155 41 100 135
145 38 125
90
135 36 120
N/A
125 33 80 110
115 30 75 100
80,000
76 38 51 64 76
60.9 4.5 16.7 39.6 53.3
56.3 38.1 50.2
14.9
53.3 35.0 47.2
51.8 3.0 45.7
13.4 33.5
50.2 44.1
47.2 12.4 30.4 41.1
11.5 38.1
44.1
27.4
41.1 10.9 36.5
NA
38.1 10.0 24.3 33.5
35.0 9.1 22.8 30.4
40
Table 15
FOR THAT SIZE FURNACE may be used.
3
100,000
4 2 2 ½ 3 4
200 20 80 175 200
185 165 185
15 75
175 175
155
165 70 170
160 150 165
10 65
150 140 155
140 60 135 145
125 55 125 135
115 N/A 50 115 125
105 45 100 115
3
100,000
102 51 64 76 102
60.9 6.0 24.3 53.3 60.9
56.3 50.2 56.3
4.5 22.8
53.3 53.3
47.2
50.2 21.3 51.8
48.7 45.7 50.2
3.0 19.8
45.7 42.6 47.2
42.6 18.2 41.1 44.1
38.1 16.7 38.1 41.1
35.0 NA 15.2 35.0 38.1
32.0 13.7 30.4 35.0
and note the
Table 16 -
120,000
2 ½ 3 4
75 185
10
70 175
5 65 165
160
60
155
N/A 50 140
46 130
43 120
39 115
120,000
64 76 102
22.8 56.3
3.0
21.3 53.3
1.5 19.8 50.2
48.7
18.2
47.2
15.2 42.6
NA
14.0 39.6
13.1 36.5
11.8 35.0