John Wood Takagi - 240H-340H-540H - Manual (Page 15)

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Page
• The maximum length of exhaust vent piping must not exceed 21.3 m (70 ft.) for 76 mm (3”)
venting, which depends on the elevation where the water heater is installed. 30.5 m (100 ft.)
for 102 mm (4”) venting (deducting 1.5 m (5 ft.) for each elbow used in the venting system). Do
not use more than 5 elbows. See the table below.
• When the horizontal vent run exceeds 1.5 m (5 ft.), support the vent run at 0.9 m (3 ft.) intervals
with overhead hangers.
-Plastic Venting Illustrations-
For details of the optional items, refer to the Installation manual for each Optional item.
Installation
Installation Manual
No. of Elbows
Max. Vertical or Horizontal (Total) Vent Length
76 mm (3") venting 102 mm (4") venting
Elevations up
to 3,000 ft
Elevations up
to 6,000 ft
Elevations up
to 10,100 ft
Elevations up
to 10,100 ft
0 21.3 m (70 ft.) 12.2 m (40 ft.) 7.6 m (25 ft.) 30.5 m (100 ft.)
1 19.8 m (65 ft.) 10.7 m (35 ft.) 6.1 m (20 ft.) 29.0 m (95 ft.)
2 18.3 m (60 ft.) 19.1 m (30 ft.) 4.6 m (15 ft.) 27.4 m (90 ft.)
5 13.7 m (45 ft.) N/A N/A 22.9 m (75 ft.)
Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
76 mm (3 in.) 5 21.3 m (70 ft.)
102 mm (4 in.) 5 30.5 m (100 ft.)
*For each elbow added, deduct 1.5 m (5 ft.) from max. vent length.
Excludes vent terminators, termination elbows, or rain caps
For details on the vent connection to these models, refer to p. 16.
Horizontal Installation Diagram Vertical Installation Diagram
Roof
Flashing
Roof
Fire stop
Wall
Connect between exhaust vent collar and plastic piping.
See the next page for instructions.