ALL INSTALLATIONS AND SERVICE MUST BE PERFORMED BY QUALIFIED SERVICE PERSONNEL.
These kits are for vertical or horizontal termination of the combustion air inlet and
the exhaust vent pipes on Category IV gas-fired condensing furnaces. The
AOPS7488 kit can be used for 2” diameter pipe systems. The AOPS7489 kit can
be used for 3” diameter pipe system. Refer to Furnace Installation Instructions for
the correct pipe size for the furnace. Both the combustion air inlet and the exhaust
vent pipes must attach to the termination kit. The termination kit must terminate
outside the structure and must be installed per the instructions outlined below for
vertical or horizontal termination. Vertical termination is preferred.
Vertical & Horizontal Termination
1. Determine the pipe diameters required for the installation from Furnace
Installation Instructions.
2. Determine the best location for the termination kit. See (Fig-2) for vertical
termination or (Fig-3) for horizontal termination. Roof termination is preferred
since it is less susceptible to damage, has reduced intake contaminants and less
visible vent vapor. For side wall termination, consideration should be given to -
A) possible damage from the vapors to plants/shrubs, other equipment and
building materials, B) possible damage to the terminal from foreign objects,
C) wind effects that may cause recirculation of flue products, debris or light snow
and D) visible vent vapor.
3. Cut one 4” diameter hole through the structure for the AOPS7488 kit or one 5”
diameter hole for the AOPS7489 kit.
4. “Length” dimension may be increased to 60” max. or decreased to 12” min. by
cutting the pipes. (see Fig-4A / 4B)
UNIT OPERATION HAZARD.
Failure to follow this caution may result in intermittent unit operation.
Do not use field supplied couplings to extend the pipes. Airflow restriction will occur and
the furnace pressure switch may cause intermittent operation.
If assembly needs to be extended to meet height or side wall thickness requirement,
the two pipes supplied in the kit may be replaced with single piece (no coupling
connections allowed) same diameter solid core, field supplied SDR-26 PVC (ASTM
D2241) pipe. (see Fig-4A / 4B)
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