27
Maximum Vent Length
Table 3
– Power Direct Vent and Power Vent Maximum Vent Length
(Combined Maximum Length for Intake and Exhaust)
SI UNIT Equivalent
120T4003N(A) 399,999 BTU/hr
120T5003N(A) 499,000 BTU/hr
3 in. Vent Pipe
Power Direct Vent
Power Vent
Power Direct Vent
Power Vent
Max. Intake Length
19.8 m
N/A
19.8 m
N/A
Max. Exhaust Length
19.8 m
19.8 m
19.8 m
19.8 m
4 in. Vent Pipe
Power Direct Vent
Power Vent
Power Direct Vent
Power Vent
Max. Intake Length
30.5 m
N/A
30.5 m
N/A
Max. Exhaust Length
30.5 m
30.5 m
30.5 m
30.5 m
6 in. Vent Pipe
Power Direct Vent
Power Vent
Power Direct Vent
Power Vent
Max. Intake Length
36.6 m
N/A
36.6 m
N/A
Max. Exhaust Length
36.6 m
36.6 m
36.6 m
36.6 m
Note:
The venting distance shown in the charts above is the combined maximum distance for the intake and
exhaust pipe and elbows. The intake and exhaust vent terminals may be in different locations (i.e., different
walls or one wall, one roof) provided that the intake equivalent venting distance does not exceed the exhaust
by more than 30 ft
(9.2 m)
.
Determining Required Vent Length
1. Determine the total length of straight vent pipe (in feet) required for both the intake and the exhaust.
2. Add 5 ft
(1.52 m)
of venting for every 90° elbow.
3. Add 2 ½ ft
(.76 m)
of venting for every 45° elbow.
4.
Total vent length CANNOT exceed maximum vent length in Table 3.
5.
Air intake CANNOT exceed exhaust by more than 30 ft (9.2 m) in any venting situation.
Example of Total Power Direct Vent Length for 120T400:
A 4 in
(10.2 cm)
venting system has a total of six 90° elbows and a total straight pipe length of 65 ft
(19.8 m)
(includes both intake and exhaust pipe). Equivalent vent length for elbows: 6 x 5 ft = 30 ft
(9.2 m).
Total
equivalent vent distance = 65 ft (19.8 m) + 30 ft (9.2 m) = 95 ft (29 m) total equivalent vent length. This is
below the maximum allowed distance of 200 feet for this model using 4 in (10.2 cm) vent.
NOTICE
DO NOT
include the 4 in
(10.2 cm)
condensate elbow or vent terminals in determining maximum vent length.
120T4003N(A) 399,999 BTU/hr
120T5003N(A) 499,000 BTU/hr
3 in. Vent Pipe
Power Direct Vent
Power Vent
Power Direct Vent
Power Vent
Max. Intake Length
65 ft.
N/A
65 ft.
N/A
Max. Exhaust Length
65 ft.
65 ft.
65 ft.
65 ft.
4 in. Vent Pipe
Power Direct Vent
Power Vent
Power Direct Vent
Power Vent
Max. Intake Length
100 ft.
N/A
100 ft.
N/A
Max. Exhaust Length
100 ft.
100 ft.
100 ft.
100 ft.
6 in. Vent Pipe
Power Direct Vent
Power Vent
Power Direct Vent
Power Vent
Max. Intake Length
120 ft.
N/A
120 ft.
N/A
Max. Exhaust Length
120 ft.
120 ft.
120 ft.
120 ft.
Summary of Contents for LUHE120T
Page 42: ...42 BMS Wiring Diagram...
Page 44: ...44 Lighting and Shutdown Instructions Figure 31 Lighting Instruction Label...
Page 62: ......
Page 63: ......
