10
I-RX-RG-RPV (09-19) PN1027501R0
INSTALLATION—CONTINUED
Combustion Air Requirements—Continued
Combustion Air: Gravity-Vented Model Series RX and RG
Both model RX and RG series furnaces have screened combustion air intake hoods in their doors. The intake hood on
a model RG furnace is factory-installed. The intake hood on a model RX furnace requires field installation as follows:
1. If intake hood parts have been shipped attached to inside of one or both furnace access doors remove them and
assemble intake hood before heater is installed.
NOTE: The parts shown in Figure 6 may be shipped attached to the inside of one or both furnace
access doors to facilitate crating. They must be removed from the inside of the doors and installed
on the outside as shown. The intake hood is comprised of the parts shown in Figure 6: inlet hood
(A), screen retainer or shield (B), and screen (C). On unit sizes 75, 100, and 125, the screen retainer
serves as a shield and no screen is used. Unit sizes 150 through 400 use the screen retainer and
screen.
2. Attach screen retainer or shield (B) (see Figure 6) using sheet metal screws (heads out).
3. Attach inlet hood (A) (see Figure 6) at top only using sheet metal screws (don’t tighten).
4. Insert screen (C) (see Figure 6) under retainer (B) and over bottom flange of inlet hood (A) and attach hood at
sides using sheet metal screws. Tighten top sheet metal screws.
Figure 6. Intake Hood Assembly
Chlorine Vapor: All Models
The presence of chlorine vapor in the combustion air of gas-fired heating equipment presents a potential corrosion
hazard. Chlorine will, when exposed to flame, precipitate from the compound—usually Freon or degreaser vapors—
and go into solution with any condensation that is present in the heat exchanger or associated parts. The result is
hydrochloric acid, which readily attacks all metals including 300 grade stainless steel.
NOTE: Care should be taken to separate chlorine vapor from the combustion process. This may
be done by the wise location of the furnace with regard to exhausters or prevailing wind direction.
Remember, chlorine is heavier than air. This fact should be kept in mind when determining instal-
lation locations of heating equipment and building exhaust systems.
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