Lx – WH Series Installation and Operation Instructions
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Trinity Lx
19
Vent and Air-inlet Pipe Length Determination
Use Table 4-5 to determine the maximum pipe length that can be used. The table calculates sweep, 90º elbows,
and 45º elbows at 5 equivalent feet each. Note: model Lx200WH has limitations when operating with Propane
Gas (LP).
Example
:
An Lx200WH can be installed with 105 equivalent feet of air-inlet piping and 105 equivalent feet of
exhaust vent piping when operating with Natural Gas. When operating with Propane Gas (LP), the maximum
length of each the exhaust vent and air-inlet pipe is limited to 50 equivalent feet (3” diameter pipe).
The length of one vent pipe (air-inlet or exhaust) may not exceed the length of the other
vent pipe by more than 20 equivalent feet.
Table 4-5 Allowable Vent and Air-Intake Pipe Size and Lengths
Model
Pipe Size
Gas
Length
ft.
Number of Elbows (90’s or 45’s) and Equivalent Feet
1
2
3
4
5
6
7
8
9
Lx200WH
3”
LP
50
45
40
35
30
25
20
15
10
5
3”
NG
105
100
95
90
85
80
75
70
65
60
4”
NG
& LP
105
100
95
90
85
80
75
70
65
60
Lx300WH &
Lx400WH
4” or 6”
NG
& LP
100
95
90
85
80
75
70
65
60
55
Lx500WH
4” or 6”
3
NG & LP
100
95
90
85
80
75
70
65
60
55
Lx600WH
4”or 6”
3
NG
2
100
95
90
85
80
75
70
65
60
55
Lx700WH &
Lx800WH
6”
1
NG
2
100
95
90
85
80
75
70
65
60
55
Notes:
1
Only 6” exhaust vent is permissible for models Lx700-800. Air-inlet pipe can be 4” or 6” (6” is highly recommended).
2
Models Lx600WH-Lx800WH operate with Natural Gas only.
3
Models Lx500WH & Lx600WH are limited to 30 ft. of 4” or 90 ft. of 6” exhaust venting when using the Air Filter Kit
(P/N 84093).
Air Filter Kit venting restrictions
- Models Lx500WH & Lx600WH are limited to 30
equivalent feet of 4” (or 90 equivalent feet of 6”) exhaust vent when using the optional
Air Filter Kit. When transitioning from 4” to 6”, the 4” venting used must be counted 3
times to convert to an equivalent length in 6”.
Example:
An application uses one 90º elbow and 5 feet of 4” venting before converting to 6”; therefore, the 4”
venting has an equivalent length of 30’ [(5’+5’) x 3] of 6” venting; thus allowing an additional 60’ equivalent
of 6” venting
(Note: Example is only true with Lx500-600 models using the optional Indoor Combustion Air
Kit).
