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C. ALLOWED SCHEDULE 40 COMBINED VENT LENGTHS (PVC, CPVC, PP)
MODEL
TCWH 180-AS /
TCWH 199-AS
Table 10 – Approved Combined Vent Lengths
NOTE: When using more than 1 elbow, reduce maximum allowable length:
•
5 feet (1.5 M) for each additional 3" 90º elbow
•
2.5 feet (.75 M) for each additional 3" 45º elbow
•
8 feet (2.4 M) for each additional 2" 90º elbow
•
4 feet (1.2 M) for each additional 2" 45º elbow
D. TIGHTENING WATER HEATER COLLAR TO EXHAUST VENT AND INTAKE PIPE
This appliance uses 2" or 3" diameter pipe for exhaust vent and intake pipe. In order to use 2" pipe, it is
required to reduce pipe size in a vertical length of pipe with a 3" x 2" reducing coupling (not included). Follow
the steps below to install 3" pipe into the appliance collar. See Figure 6 for additional details.
1. Clean and dry the appliance connection. DO NOT use primer or cement on the
appliance connection.
2. Push the length of pipe into the connection until it touches the bottom of the fitting.
3. Tighten the clamps using a screwdriver.
4. Ensure the pipe is secure before continuing installation.
5. For 2" installations, install the reducing coupling in a vertical section of pipe. At least a 6" length of 3"
pipe MUST BE INSTALLED before reducing to 2". See Figure 7.
Figure 6 – Correct Installation into the Water Heater Collar
Figure 7 – Transitioning from 3" to 2" Vent Pipe
2" COMBUSTION AIR/ VENT PIPE
MAX
50' (15.24 M)
3" COMBUSTION AIR/VENT PIPE
MAX
100' (30 M)
25
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