NTI Trinity Lx 150 - Page 17

Lx Series Installation and Operation Instructions │Trinity Lx
17
Vent and Air-Intake Pipe Length Determination
Use Table 4-4 to determine the maximum pipe length that can be used. The table calculates sweep, 90º elbows,
and 45º elbows at 5 equivalent feet [1.52 m] each. Note: models Lx150-200 have limitations when operating
with Propane Gas (LP).
Example: An Lx200 can be installed with 105 equivalent feet [32 m] of air-intake piping and 105 equivalent feet
[32 m] of vent piping when operating with Natural Gas. When operating with Propane Gas (LP), the maximum
vent length in equivalent feet is limited to 50’ (3” pipe).
The length of one vent pipe (intake or exhaust) may not exceed the length of the other
vent pipe by more than 20 equivalent feet (6.1 m).
Table 4-4 Allowable Vent and Air-Intake Pipe Size and Lengths
Number of Elbows (90’s or 45’s) and Equivalent Feet [Meters]
Model Pipe Size Gas
Length
ft. [m]
1 2 3 4 5 6 7 8 9
3”
LP
50
[15.2]
45
[13.7]
40
[12.2]
35
[10.7]
30
[9.1]
25
[7.6]
20
[6.1]
15
[4.6]
10
[3.0]
5
[1.5]
3”
NG
105
[32]
100
[30.5]
95
[28.9]
90
[27.4]
85
[25.9]
80
[24.4]
75
[22.9]
70
[21.3]
65
[19.8]
60
[18.3]
Lx150
Lx150E
Lx200
4”
NG
& LP
105
[32]
100
[30.5]
95
[28.9]
90
[27.4]
85
[25.9]
80
[24.4]
75
[22.9]
70
[21.3]
65
[19.8]
60
[18.3]
Lx300
Lx400
4” or 6”
NG
& LP
100
[30.5]
95
[28.9]
90
[27.4]
85
[25.9]
80
[24.4]
75
[22.9]
70
[21.3]
65
[19.8]
60
[18.3]
55
[16.8]
Lx500 4” or 6”
3
NG &
LP
100
[30.5]
95
[28.9]
90
[27.4]
85
[25.9]
80
[24.4]
75
[22.9]
70
[21.3]
65
[19.8]
60
[18.3]
55
[16.8]
Lx600 4”or 6”
3
NG
2
100
[30.5]
95
[28.9]
90
[27.4]
85
[25.9]
80
[24.4]
75
[22.9]
70
[21.3]
65
[19.8]
60
[18.3]
55
[16.8]
Lx700
Lx800
6”
1
NG
2
100
[30.5]
95
[28.9]
90
[27.4]
85
[25.9]
80
[24.4]
75
[22.9]
70
[21.3]
65
[19.8]
60
[18.3]
55
[16.8]
Notes:
1
Only 6” exhaust vent is permissible for the Lx700-800. Air intake pipe can be 4” or 6” (6” is recommended).
2
Models Lx600, Lx700 and Lx800 operate with Natural Gas only.
3
Models Lx500-Lx600 are limited to 30’ of 4” or 90’ of 6” exhaust venting when using the Indoor Combustion Air Kit.
Indoor Combustion Air Kit and Venting Restrictions - Models Lx500 and 600 are
limited to 30’ equivalent of 4” or 90’ equivalent of 6” exhaust vent when using the
optional Indoor Combustion Air 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 and Lx 600 using optional Indoor Combustion Air Kit).
Venting and Air Intake Options
Venting options include direct vent, with or w/o termination kits, and one-pipe concentric vent systems. Direct
Vent is the standard air intake method; however, Lx500-800 models have the option to draw combustion air
directly from the room using the NTI Indoor Combustion Air Kit (part number 84093). See Table 4-5 through 4-
7 for a list of Kits and Figures 4-5 to 4-15 for application illustrations.
PVC In Canada - Authorities in some jurisdictions are not allowing the use of any PVC
venting materials with condensing boilers, even if System 636 certified. Check with the
local safety inspector to verify compliance prior to installing a PVC Concentric Vent Kit with a Trinity appliance.
Side Wall Options - Due to potential moisture loading (build-up) along the exterior wall,
sidewall venting may not be the preferred venting option. See Figs 4-5(b), 4-6(b), 4-9(b).