Gas Supply And Piping; High Altitude Derate; Propane Gas Conversion - Goodman xMEC96 Series User Manual

If it is necessary for the installer to supply additional line voltage wiring to the inside of the
furnace, the wiring must conform to all local codes, and have a minimum temperature rating
of 105°C. All line voltage wire splices must be made inside the furnace junction box.
The integrated control module humidifier terminal (HUM) is energized with 115 volts when-
ever the induced draft blower is energized. The integrated control module electronic air
cleaner terminal (EAC) is energized with 115 volts whenever the circulator blower is ener-
gized. This terminal can also be used to provide 115 volt power to a humidifier trans-
former. The remaining primary transformer wire would be connected to the Line N on
the control board.
G S P
AS UPPL Y AND IPING
The furnace rating plate includes the approved furnace gas input rating and gas types. The
furnace must be equipped to operate on the type of gas applied. This includes any conversion
kits required for alternate fuels and/or high altitude.
Inlet gas supply pressures must be maintained within the ranges specified in the adjacent
table. The supply pressure must be constant and available with all other household gas fired
appliances operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must
not be exceeded to prevent unit overfiring.
H A D
IGH LTITUDE ERATE
When this furnace is installed at high altitude, the appropriate
High Altitude orifice kit must be applied. This is required due to
the natural reduction in the density of both the gas fuel and com-
bustion air as altitude increases. The kit will provide the proper
design certified input rate within the specified altitude range.
High altitude kits are purchased according to the installation alti-
tude and usage of either natural or propane gas. Consult the
furnace Specification Sheet for appropriate kits.
Do not derate the furnace by adjusting the manifold pressure to a
lower pressure than specified on the furnace rating plate. The
combination of the lower air density and a lower manifold pressure
will prohibit the burner orifice from drawing the proper amount of
air into the burner. This may cause incomplete combustion, flash-
back, and possible yellow tipping.
In some areas the gas supplier may artificially derate the gas in an
effort to compensate for the effects of altitude. If the gas is
artificially derated, the appropriate orifice size must be determined based upon the BTU/ft
altitude. Refer to the National Fuel Gas Code, NFPA 54/ANSI Z223.1, and information provided by the gas supplier to determine the
proper orifice size.
A different pressure switch may be required at high altitude regardless of the BTU/ft
Specification Sheet for pressure switch.
P G C
ROPANE AS ONVERSION
This unit is configured for natural gas, but may be converted for use with L.P . gas. Refer to the section on PROPANE GAS/HIGH
ALTITUDE INSTALLATIONS for L.P. kit selection.
Consult the furnace Specification Sheet for a listing of appropriate kits. The indicated kits must be used to insure safe and proper
furnace operation. All conversions must be performed by a quali-
fied installer, or service agency.
G V
AS ALVE
This unit is equipped with a 24 volt gas valve controlled during
furnace operation by the integrated control module. As shipped,
T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE
INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT
RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES
.
OPERATING
INLET GAS SUPPLY PRESSURE
Natural Gas Minimum: 4.5" w.c.
Propane Gas Minimum: 11.0" w.c.
P
OSSIBLE PROPERTY DAMAGE
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
. A
FURNACE OPERATION
QUALIFIED INSTALLER OR SERVICE AGENCY
content of the fuel used. Consult the furnace
3
T
O AVOID POSSIBLE UNSATISFACTORY OPERATION OF EQUIPMENT
DAMAGE DUE TO UNDERFIRING OR EQUIPMENT
/
OF NATURAL PROPANE GAS PIPING NEEDED WHEN RUNNING PIPE FROM
/
THE METER TANK TO THE FURNACE
24
Accessories - Accessories Wiring
Figure 27
CAUTION
Maximum: 10.0" w.c.
Maximum: 13.0" w.c.
WARNING
,
PERSONAL INJURY OR DEATH MAY
LL CONVERSIONS MUST BE PERFORMED BY A
.
3 content of the derated gas and the
WARNING
,
USE THE PROPER SIZE
.
,
THE
. T
HE