Carrier 59SP5A Installation, Start-Up, Operating And Service And Maintenance Instructions page 45
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Table 15 - Maximum
Equivalent
Vent Length
- Ft. (M)
4501 to 10,000
Ft. (0 to 1370 M) Altitude
NOTE:
Maximum
Equivalent
Vent Length
(MEVL)
does NOT
include
elbows
or terminations.
Use Table 14 - Deductions
from
Maximum
Equivalent
Vent Length
to determine
allowable
vent length for each application.
DIRECT VENT (2-PIPE) AND NON-DIRECT
VENT (1-PIPE)
Altitude
FT (M)
Unit Size
Vent
Pipe
Diameter
2-1/2
196
(59.7)
198
(60.4)
146
(44.5)
91
(27.7)
1-1/2
J
2
33
I
(10'1)
I
171
I 20 I (61) I 111
54
16
I
27
I (62>I 156
I
16
I
(4.9)
J
103
49
12
I
21
I (6.4) I 145
I
13
I
(4.0)
I
96
44
10
I
15
I
(4.6)
I
133
I
10
I (6.0) I
89
40
I 10 I /60) I 121
I
7
I
(2'1)
I
82
35
I 5 I /15) I 110
76
31
40,000*
(52.1)
4501
to 5000
60,000
(33.8)
221
(67.4)
(1370
to
80,000
(16.5)
195
(59.4)
216
(65.8)
1524)
100,000
(4.9)
200
(61.0)
222
(67.7)
120,000
80
(24.4)
211
(64.6)
40,000*
(48.2)
179
(54.6)
5001
to 8000
60,000
(31.4)
186
(56.7)
207
(63.1)
(1524
to
80,000
(14.9)
137
(41.8)
183
(55.8)
200
(61.0)
1829)
100,000
(3.7)
85
(25.9)
188
(57.3)
208
(63.4)
120,000
74
(22.6)
199
(60.7)
40,000*
(44.2)
162
(49.4)
8001
to 7000
60,000
(29.3)
174
(53.0)
194
(59.1)
(1829
to
80,000
(13.4)
120
(36.6)
171
(52.1)
185
(56.4)
2134)
100,000
(6.0)
79
(24.1)
178
(54.6)
195
(59.4)
120,000
68
(20.7)
187
(57.0)
40,000*
(40.5)
146
(44.5)
7001
to 8000
60,000
(27.1)
163
(49.7)
181
(55.2)
(2134
to
80,000
(12.2)
120
(36.6)
159
(48.5)
170
(51.8)
2438)
100,000
73
(22.3)
167
(50.9)
182
(55.5)
120,000
62
(18.9)
175
(56.3)
40,000*
(36.9)
130
(39.6)
8001
to 9000
60,000
(25.0)
152
(46.3)
168
(51.2)
(2438
to
80,000
(10.7)
111
(36.8)
148
(45.1)
156
(47.5)
2743)
100,000
67
(20.4)
157
(47.9)
170
(51.8)
120,000
56
(17.1)
164
(50.0)
40,000"
(33.5)
115
(35.1)
9001
to
60,000
(26.2)
142
(43.3)
156
(47.5)
10,000
80,000
(9.4)
103
(31.4)
137
(41.8)
142
(43.3)
(2743
to
3048)
100,000
62
(18.9)
147
(44.8)
157
(47.9)
120,000
51
(15.5)
156
(46.6)
Notes:
1. 3- and 4-in.
Vent pipe systems require long radius elbows.
2. Total equivalent
vent lengths under 10' for 40,000 BTUH require the use of an outlet choke plate at altitudes 0 to 2000 ft (0 to 610 M).
Failure to use an outlet
choke when required
may result
in flame disturbance
or flame
sense lockout.
3. Vent sizing for Canadian
installations
over 4500 ft (1370m) above sea level are subject to acceptance
by the local authorities
having jurisdiction.
4. NA - Not allowed;
pressure switch will not close, or flame disturbance
may result.
5. Do not use pipe size greater than those specified
in table or incomplete
combustion,
flame disturbance,
or flame sense lockout may occur.
6. Size both the combustion-air
and vent pipe independently,
then use the larger diameter for both pipes.
7. Assume the two 45 ° elbows
equal one 90 ° elbow.
Wide radius elbows
are desirable
and may be required in some cases.
8. Elbows and pipe sections within the furnace casing and at the vent termination
should
not be included
in vent length or elbow count.
9. The minimum
pipe length is 5 ft. (1.5 M) for all applications.
10. Use 3-in.
(76 mm) diameter vent termination
kit for installations
requiring
4-in.
(102 mm) diameter
pipe.
45
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