Gas Supply And Piping; Gas Supply Requirements - International comfort products C9MVX Installation Instructions Manual

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.

Gas Supply Requirements

WARNING
!
FIRE HAZARD
Failure to follow this could result in personal injury,
death, and/or property damage.
Do NOT set input rating above that shown on rating
plate.
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.
•
Do not allow minimum supply pressure to vary downward.
Doing so will decrease input to furnace. Refer to Table 6 for
Gas supply. Refer to Table 7, Table 8, Table 9 and
Table 10 for manifold pressures.
Table 6 Gas Pressures
Gas Type
Recommended
Natural 7 in wc
(1744 Pa)
Propane 11 in wc
(2740 Pa)
Gas Piping Requirements
NOTE: The gas supply line must be installed by a qualified service
technician in accordance with all building codes.
NOTE: In the state of Massachusetts.
a. Gas supply connections MUST be performed by a
licensed plumber or gas fitter.
440 01 2024 04
Supply Pressure
Max. Min.
14 in wc 4.5 in wc
(3487 Pa) (1121 Pa)
14 in wc 11 in wc
(3487 Pa) (2740 Pa)
Specifications are subject to change without notice.
b. When flexible connectors are used, the maximum length
shall not exceed 36" (915 mm).
c. When lever handle type manual equipment shutoff
valves are used, they shall be T−handle valves.
d. The use of copper tubing for gas piping is NOT approved
by the state of Massachusetts.
1. Install gas piping in accordance with local codes, or in the
absence of local codes, the applicable national codes. Refer
to NFPA 54/ANSI Z223.1 for proper gas pipe size.
2. It is recommended that a manual equipment shutoff valve be
installed in the gas supply line outside the furnace. Locate
valve as close to the furnace as possible where it is readily
accessible. Refer to Figure 31.
3. Use black iron or steel pipe and fittings or other pipe approved
by local code.
4. Use pipe thread compound which is resistant to natural and
Propane gases.
5. Use ground joint unions and install a drip leg no less than 3"
(76.2mm) long to trap dirt and moisture before it can enter gas
control valve inside furnace.
6. Use two pipe wrenches when making connections to prevent
gas valve from turning.
7. Install a manual shut−off valve external to furnace casing and
tighten all joints securely.
8. If local codes allow the use of flexible gas appliance
connectors, always use a new listed connector.
Do not use a connector which has previously serviced
another gas appliance.
9. Flexible corrugated metal gas connector may NOT be used
inside the furnace or be secured or supported by the furnace
or ductwork.
10. Properly size gas pipe to handle combined appliance load or
run gas pipe directly from gas meter or Propane gas regulator.
NOTE: Refer to Figure 31 or Figure 32 for the general layout at
the furnace. The rules listed apply to natural and Propane gas pipe
installations.
NOTE: On the Dual Certified or Direct Vent models, install the gas
pipe grommet to the furnace side panel with the gas pipe entry. If
needed, remove the 2" (50.8mm) hole plug from the plastic
accessory bag and relocate to the open hole in the furnace side
panel.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
A flexible corrugated metal gas connector must be
properly installed, shall not extend through the side
of the furnace,and shall not be used inside the
furnace.
Black iron pipe shall be installed at the furnace gas
control valve and extend a minimum of 2, (50.8mm)
outside furnace casing.
11. Install correct pipe size for run length and furnace rating.
12. Measure pipe length from gas meter or Propane second
stage regulator to determine gas pipe size.
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