INLET/OUTLET VENT TERMINATIONS (100,000 - 150,000 BTU/HR)
Standard Horizontal Termination
When 3 inch pipe is used between the water heater and the outside wall, reduce it to 2 inch pipe before penetrating the wall. A maximum of 18 inches of 2 inch pipe may be used between the 3 inch transition and the inside of the wall (see figure 7A).
The standard horizontal air inlet termination is a 2 inch pipe which terminates at the exterior wall and utilizes a coupling to prevent the pipe from being pushed back into the structure. The standard horizontal exhaust outlet termination is a 2 inch pipe which terminates 12 inches from the outside wall. The air inlet must be located with respect to the exhaust outlet as shown in figure 7A (bottom).
Install a drain tee assembly and trap in the inlet vent as close to the water heater as possible. This is to drain any water that may be in the combustion air pipe and prevent it from entering the blower. Connect the trap drain line to a suitable drain or downstream of the condensate trap of the water heater.
Note: See “Venting Additional Polaris® Units” on Page 10 for correct terminations if installing more than one Polaris® gas water heater.
Alternative Horizontal Termination
The combustion air and exhaust terminations may be raised up to 24 inches above the wall penetrations if required for anticipated snow levels (see figure 8A). The two elbows shown in figure 8A are considered part of the termination and should not be included when determining the maximum allowable vent pipe length.
Note: See “Venting Additional Polaris® Units” on Page 10 for correct terminations if installing more than one Polaris® gas water heater.
Figure 8A: Alternate Horizontal Termination |
(100,000 - 150,000 BTU/Hr Input Models) |
Figure 7A: Standard Horizontal Termination (100,000 - 150,000 BTU/Hr Models)
9
