Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 31

TABLE 7—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION IN
WINTER DESIGN
UNIT
TEMPERATURE
SIZE
040
060
080
100
120
140
* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe length
as specified in Table 6.
† Insulation thickness based on R value of 3.5 (ft_ • °F• hr)/(Btu•in.)
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
WINTER DESIGN TEMPERATURE AMBIENT*
MAX PIPE
DIAMETER
(°F) (IN.)
20 1.5
0 1.5
-20 1.5
20 2
0 2
-20 2
20 2
0 2
-20 2
20 2
0 2
-20 2
20 2.5
0 2.5
-20 2.5
20 2.5
0 2.5
-20 2.5
20 3
0 3
-20 3
20 3
0 3
-20 3
20 4
0 4
-20 4
20 3
0 3
-20 3
20 4
0 4
-20 4
A93058
WITHOUT
INSULATION
51
28
16
45
22
10
65
35
20
55
48
30
70
47
28
40
40
38
70
50
28
70
61
37
70
48
23
60
60
44
70
57
30
The field drain connection (condensate trap or drain tube coupling)
is sized for l/2-in. CPVC, 1/2-in. PVC, or 5/8-in. ID tube
connection.
Drain pipe and fittings must conform to ANSI standards and
ASTM D1785 or D2846. CPVC or PVC cement and primer must
conform to ASTM D2564 or F493. In Canada, use CSA or ULC
certified schedule 40 CPVC or PVC drain pipe, fittings, and
cement.
When a condensate pump is required, select a pump which is
approved for condensing furnace applications. To avoid conden-
sate spillage, select a pump with an overflow switch.
Furnace condensate is mildly acidic, typically in the pH range of
3.2 to 4.5. Due to corrosive nature of this condensate, a condensate
38 pH neutralizing filter may be desired. Check with local
authorities to determine if a pH neutralizer is required.
APPLICATION
The furnace, A/C, and humidifier drains may be combined and
drained together. The A/C drain must have an external, field-
supplied trap prior to the furnace drain connection. All drain
31
WITH 3/8–IN. OR
THICKER INSULATION†
70
70
70
70
70
58
70
70
70
55
55
55
70
70
70
40
40
40
70
70
70
70
70
70
70
70
70
60
60
60
70
70
70