Gas Supply And Piping - International comfort products C9MPX Installation Instructions Manual

Rain Cap to Vent Pipe Assembly
Figure 34
25-22-02
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
When using the alternate screw assembly method,
drill a clearance hole in the rain cap and a pilot hole
in the vent pipe for the screw size being used.
Failure to drill adequate holes may cause cracking
of the PVC components, allowing flue gases to be
recirculated.
6. Install the Y concentric fitting and the pipe assembly through
the structure's hole. For vertical termination, install the parts
through the field supplied roof boot/flashing. NOTE: Do not
allow insulation or other materials to accumulate inside the
pipe assembly when installing through the structure's hole.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
Do not operate the furnace with the rain cap
removed as recirculating of the flue gases may
occur. Water may also collect inside the larger
combustion air pipe and flow to the burner
enclosure.
7. Secure the assembly to the structure as shown in Figure 32
or Figure 36 using field supplied metal strapping or
equivalent material.
NOTE: Ensure the termination height is above the roof
surface or anticipated snow level as shown in Figure 32 for
vertical termination. Ensure the termination location
clearance dimensions are as shown in Figure 35 and
Figure 36 for horizontal termination.

Gas Supply and Piping

WARNING
!
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Models designated for Natural Gas are to be used
with Natural Gas ONLY, unless properly converted to
use with Propane gas.
NOTE: The rating plate is stamped with the model number, gas
type and gas input rating.
34
Drill clearance hole in rain
cap and pilot hole in vent pipe.
Stainless steel screw
(Field supplied)
Specifications are subject to change without notice.
Concentric Vent and Combustion−
Figure 35
Air Side Termination
1" (25.4mm) max.
Combustion
Air
Vent
8. Install the rain cap and the small diameter pipe assembly in
the Y concentric fitting and the large pipe assembly. Ensure
that the small diameter pipe is bottomed out and securely
cemented in the Y concentric fitting.
9. Cement the furnace combustion air and vent pipes to the
concentric vent termination assembly. See Figure 35 or
Figure 36 for proper pipe attachment.
10. Operate the furnace through one heat cycle to ensure
combustion air and vent pipes are properly connected to the
concentric termination connections.
Concentric Vent Sidewall
Figure 36
Attachment
Vent
Combustion
Air
455 Elbow
(Field Supplied)
Note:
Securing strap must be field installed to prevent movement of termination kit in side wall.
Gas Supply Requirements
Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas
suppliers.
(See Propane Gas Conversion Kit instruction manual for furnaces
converted to Propane gas)
•
Use only the Type of gas approved for this furnace. See
rating plate for approved gas type.
1
•
A / " NPT plugged tapping, accessible for a test gauge
8
connection,must be installed immediately upstream of the
gas supply connection to furnace.
•
Gas supply pressure should be within minimum and
maximum values listed on rating plate. Pressures are
usually set by gas suppliers.
•
Gas input must not exceed the rated input shown on the
rating plate. Overfiring will result in failure of heat exchanger
and cause dangerous operation.
Roof Overhang
12" (304.8mm) min.
Maintain 12" (304.8mm) clear-
ance above highest anticipated
snow level or grade whichever
is greater.
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Strap
Combustion
(Field Supplied)
Air
Vent
Flush to
1" (25.4mm)
max.
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