All installations and services must be performed by qualified service personnel.
14
When indoor air is used for combustion, measures should be taken to prevent drawing in corrosive
chemicals vapors or gases with the combustion air supply. Such chemicals include, but are not limited
to, chlorinated and/or fluorinated hydrocarbons such as found in refrigerants, aerosol propellants, dry
cleaning fluids, degreasers and removers. Other harmful compounds may come from bleaches, air
fresheners or mastics. Vapors from such products can form reactive acid producing chemical species
when burned in a gas flame. The life of the furnace could be reduced should acidic compounds form
within the furnace.
NOTICE:
Heat exchanger failure accelerated by contaminated combustion air will void the furnace
heat exchanger limited lifetime warranty.
F. Installation Of Outside Exhaust / Intake Terminations
1. After determining appropriate installation locations (suitable locations must observe all clearances
specified in this manual), mark and cut two (2) holes in the outside wall of the following sizes for
the outdoor terminal(s),
•
2-3/8 inch diameter
, for furnace models
CHB1 / CDB1-50
and
CHB1 / CDB1-75
, or
•
3-1/2 inch diameter
, for the furnace models
CHB1 / CDB1-100
and
CHB1 / CDB1-125
.
2. Measure and cut two (2), 2-inch diameter thermoplastic pipes 1-1/2 inches longer than the depth
of the wall. (Cutting the pipe longer leaves a ¾ inch connection allowance at both ends of the
pipe.) For 3-inch diameter PVC pipe, leave a 3-inch allowance for end connections. Using PVC
pipe cement, glue a PVC elbow or coupling fitting to one (1) end of each pipe.
Before inserting the pipe through the wall, mark the other end of the pipe so the elbow orientation
can be determined. Also, if a protective shield (refer to Section E.,
passage
1. of this manual) will
be used on the exterior surface of the wall, it should be installed at this time. From the inside, glue
a coupling fitting to each pipe, using PVC pipe cement, while being careful to maintain the proper
orientation of the termination elbow(s). Complete the assembly of the outlet and inlet as shown in
Figure 5, making sure that the spacing between the inlet and outlet complies with that noted in
Figure 3.
Figure 5: Typical Construction Details of Sidewall Vent and Air Intake Terminations