507271-02
Page 21 of 52
Issue 1621
General Guidelines for Vent Terminations
In Non-Direct Vent applications, combustion air is taken from
indoors and the flue gases are discharged to the outdoors.
This unit is then classified as a non-direct vent, Category
IV gas furnace.
In Direct Vent applications, combustion air is taken from
outdoors and the flue gases are discharged to the outdoors.
This unit is then classified as a direct vent, Category IV gas
furnace.
In both Non-Direct Vent and Direct Vent applications, the
vent termination is limited by local building codes. In the
absence of local codes, refer to the current National Fuel
Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current
CSA-B149 Natural Gas and Propane Installation Codes in
Canada for details.
Position termination according to location given in Figure 27
or 28. In addition, position termination so it is free from any
obstructions and 12” above the average snow accumulation.
At vent termination, care must be taken to maintain
protective coatings over building materials (prolonged
exposure to exhaust condensate can destroy protective
coatings). It is recommended that the exhaust outlet not be
located within 6 feet (1.8 m) of a condensing unit because
the condensate can damage the painted coating.
Do not use screens or perforated metal in exhaust
terminations. Doing so will cause freeze-ups and may
block the terminations.
IMPORTANT
For Canadian Installations Only:
In accordance to CSA International B149 installation
codes, the minimum allowed distance between the
combustion air intake inlet and the exhaust outlet of
other appliances shall not be less than 12 inches (305
mm).
IMPORTANT
NOTE:
See Table 9 for maximum allowed exhaust pipe length
without insulation in unconditioned space during winter design
termperatures below 32°F (0°C). If required exhaust pipe should
be insulated with 1/2” (13 mm) Armaflex or equivalent. In extremely
cold climate areas, 3/4” (19 mm)Araflex or equivalent may be
necessary. Insulation on outside runs of exhaust pipe must
be painted or wrapped to protect insulation from deterioration.
Exhaust pipe insulation may not be necessaty in some specific
applications.
Table 9
Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation
In Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace
Winter Design Temperatures
1
ºF (ºC)
Vent Pipe
Diameter
Unit Input Size
045
070
090
110
32 to 21
(0 to -6)
PVC
2
PP
PVC
2
PP
PVC
2
PP
PVC
2
PP
2 in.
18
16
31
28
50
48
30
30
2-1/2 in.
13
N/A
24
N/A
42
N/A
56
N/A
3 in.
9
9
18
18
35
35
47
47
20 to 1
(-7 to -17)
2 in.
9
8
18
16
32
29
30
30
2-1/2 in.
5
N/A
13
N/A
24
N/A
34
N/A
3 in.
N/A
N/A
8
8
19
19
26
26
0 to -20
(-18 to -29)
2 in.
5
3
12
10
22
19
30
27
2-1/2 in.
N/A
N/A
7
N/A
15
N/A
22
N/A
3 in.
N/A
N/A
N/A
N/A
10
10
16
16
1
Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.
2
Poly-Propylene vent pipe (PP) by Duravent and Centrotherm
NOTE - Concentric terminations are the equivalent of 5’ and should be considered when measuring pipe length.
NOTE- Maximum uninsulated vent lengths listed may include the termination (vent pipe exterior to the structure ) and cannot exceed
5 linear feet or the maximum allowable intake or exhaust vent length listed in table 5 or 6.
NOTE - If insulation is required an unconditioned space, it must be located on the pipe closed to the furnace
Содержание 92G1DF-P
Страница 17: ...507271 02 Page 17 of 52 Issue 1621 A95DF 95G1DF and A93DF 92G1DF Table 7 ...
Страница 18: ...507271 02 Page 18 of 52 Issue 1621 A95DF 95G1DF and A93DF 92G1DF Table 8 ...
Страница 31: ...507271 02 Page 31 of 52 Issue 1621 Figure 49 Trap Drain Assembly Using 1 2 PVC or 3 4 PVC ...
Страница 36: ...507271 02 Page 36 of 52 Issue 1621 Figure 56 Typical Wiring Diagram For A93DF 92G1DF ...
Страница 37: ...507271 02 Page 37 of 52 Issue 1621 Typical Wiring Diagram Figure 57 For A95DF 95G1DF ...
Страница 50: ...507271 02 Page 50 of 52 Issue 1621 Start Up Performance Check List ...
