27
DIRECT VENT INSTALLATION DIAGRAMS
See
Note 6
See Note 5
See
Note 7
Tee with
Drain Tap
See
Note 5
See Note 4
See Note 4
3" x 2"
Reducer
3" x 2"
Reducer
Exhaust
Elbow
Assembly
To Drain*
See Note 3
Notes:
1. Support Horizontal Pipe Every
Four Feet. Support Vertical
Pipe Every Six Feet.
2. Increase the 12" minimum
above grade to keep terminal
openings above anticipated snow levels.
3. Slope all piping 1/8" per foot down
toward water heater.
4. When venting with 2" pipe, a sufficient
length of 3" pipe (6" minimum) must be
inserted into the exhaust and inlet elbow
assembly before transitioning down to 2" pipe
with a 3" x 2" reducer.
5. For units with inputs of 150,000 BTU/hr and
below, use 2" or 3" pipe. For units with inputs
of 175,000 BTU/hr and above, use only 3" pipe.
6. See Figure 11 from "Vent Pipe Termination" on
page 22 to properly locate the inlet and
exhaust
terminals.
7. Connect blocked pressure switch hose to
condensate
trap.
12" Min. Above
Grade or
Anticipated
Snow Level.
See Note 2.
*Direct vent combustion air intake drains are required in certain situations.
See the section on Direct Vent Air Intake Moisture Protection on page 24.
Figure 24. SIDEWALL VENT INSTALLATION (ALL MODELS)
See
Note 3
See
Note 6
See
Note 3
Drain Pan
(Piped To Adequate Drain)
See
Note 1
See
Note 1
See Note 1
See Note 5
12" Min.
12" Min. Above
Roof or Anticipated
Snow Level.
See Note 2.
Notes:
1. Support Horizontal Pipe Every Four Feet.
Support Vertical Pipe Every Six Feet.
2. Increase The 12 Inches Minimum Above
Grade To Keep Terminal Openings Above
Anticipated Snow Levels.
3. For units with inputs of 150,000 BTU/hr and
below, use 2" or 3" pipe. For units with inputs
of 175,000 BTU/hr and above, use only 3" pipe.
4. When venting with 2" pipe, a sufficient length of
3" pipe (6" minimum) must be inserted into the exhaust and
inlet elbow assembly before transitioning down to
2" pipe with a 3" x 2" reducer.
5. See Figure 11 from "Vent Pipe Termination" on page 22
to properly locate the inlet and exhaust terminals.
6. Connect blocked pressure switch hose to
condensate
trap.
*Direct vent combustion air intake drains are required in certain situations.
See the section on Direct Vent Air Intake Moisture Protection on page 24
See Note 4
3" x 2"
Reducer
Exhaust
Elbow
Assembly
See Note 4
3" x 2"
Reducer
Figure 25. ROOF VENT INSTALLATION (ALL MODELS)