Gas Supply And Piping; Igh Ltitude Erate; Ropane As Onversion; As Iping Onnections - Goodman *MH8 Installation Instructions Manual

wiring must conform to all local and national codes. Connect the
COM side of the humidifier to the B/C terminal on the furnace
control board (or to the COM side of the 24 VAC transformer). DO
NOT C NO NO NO NO T C T C T CONNEC T C ONNEC ONNEC ONNECT 115V HUMIDIFIER ONNEC T 115V HUMIDIFIER T 115V HUMIDIFIER T 115V HUMIDIFIER T 115V HUMIDIFIER T T T T T O O O O O THESE
G G G G G S S S S S P P P P P
A S A S UPPL UPPLY Y Y Y Y A N D UPPL A N D A N D IPING IPING
A S A S A S UPPL UPPL A N D A N D IPING IPING 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.
T
O PREVENT UNRELIABLE OPERATION
INLET GAS SUPPLY PRESSURE
RATING PLATE WITH ALL OTHER
.
OPERATING
Inlet gas supply pressures must be maintained within the ranges
specified in the following table. The supply pressure must be con-
stant 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.
Inlet Gas Supply Pressure
Natural Gas Minimum: 5.0" w.c.
Minimum: 11.0" w.c.
Propane Gas
NOTE: NOTE: NOTE: Adjusting the minimum supply pressure below the limits in NOTE: NOTE:
the above table could lead to unreliable ignition. Gas input to the
burners must not exceed the rated input shown on the rating plate.
Overfiring of the furnace can result in premature heat exchanger
failure. Gas pressures in excess of 13 inches water column can also
cause permanent damage to the gas valve.
At all altitudes, the manifold pressure must be within 0.3 inches
w.c. of that listed in the Specification Sheet applicable to your model
for the fuel used. At all altitudes and with either fuel, the air tempera-
ture rise must be within the range listed on the furnace nameplate.
Should this appliance be converted to LP, refer to the instructions
included in the factory authorized LP conversion kit.
H H H H H A A A A A D D D D D
IGH IGH LTITUDE LTITUDE ERATE ERATE
IGH IGH IGH LTITUDE LTITUDE LTITUDE ERATE ERATE ERATE
IMPORT T T T T ANT NO IMPOR IMPOR ANT NO ANT NO TE: TE:
IMPOR IMPOR ANT NO ANT NOTE: TE: The furnace will naturally derate itself with TE:
altitude. Do not attempt to increase the firing rate by changing
orifices or increasing the manifold pressure. This can cause poor
combustion and equipment failure.
High altitude installations may require both a pressure switch and
an orifice change. These changes are necessary to compensate for
the natural reduction in the density of both the gas fuel and the
combustion air at higher altitude.
For installations above 7000 feet, please refer to your distributor for
required kit(s).
THESE THESE TERMINALS. THESE THESE TERMINALS. TERMINALS. TERMINALS. TERMINALS.
CAUTION
OR EQUIPMENT DAMAGE
MUST BE AS SPECIFIED ON THE
HOUSEHOLD GAS FIRED APPLIANCES
Maximum:10.0" w.c.
Maximum:13.0" w.c.
Gas Altitude
DO DO DO DO
Natural
0-7000
Propane
NOTE: In Canada, gas furnaces are only certified to 4500 feet.
Contact the distributor for a tabular listing of appropriate
manufacturer's kits for propane gas and/or high altitude installa-
tions. 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.
P P P P P G G G G G
ROPANE ROPANE
ROPANE ROPANE ROPANE
,
THE
UNIT
P
OSSIBLE PROPERTY
OCCUR IF THE
APPROPRIATE
FURNACE OPERATION
QUALIFIED INSTALLER
This unit is configured for natural gas. The appropriate manufacturer's
propane gas conversion kit, must be applied for propane gas instal-
lations. Refer to the "Propane Gas and/or High Altitude Installations"
section for details.
Contact your distributor for a tabular listing of appropriate
manufacturer's kits for propane gas and/or high altitude installa-
tions. 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 G G G G P P P P P
AS AS AS AS AS IPING IPING IPING IPING IPING
T
O AVOID POSSIBLE
DAMAGE DUE
OF NATURAL
/
THE METER
When sizing a trunk line, be sure to include all appliances which will
operate simultaneously.
The gas piping supplying the furnace must be properly sized based
on the gas flow required, specific gravity of the gas, and length of
the run. The gas line installation must comply with local codes, or in
their absence, with the latest edition of the National Fuel Gas Code,
NFPA 54/ANSI Z223.1.
17
G G G G G S S S S S
A S A S A S A S A S U P P L U P P L U P P L U P P L U P P LY Y Y Y Y A N D
Manifold Pressure
Kit Orifice
High Stage Low Stage
None #43 3.5" w.c.
#55 10.0" w.c.
LPM-03B
C C C C C
AS AS ONVERSION ONVERSION
AS AS AS ONVERSION ONVERSION ONVERSION
WARNING
,
DAMAGE PERSONAL INJURY
CORRECT CONVERSION KITS ARE
KITS MUST BE APPLIED TO ENSURE
. A
LL CONVERSIONS MUST
.
OR SERVICE AGENCY
C C C C C
ONNECTIONS ONNECTIONS ONNECTIONS ONNECTIONS ONNECTIONS
WARNING
UNSATISFACTORY OPERATION
TO UNDERFIRING OR EQUIPMENT
/
PROPANE GAS PIPING NEEDED
.
TANK TO THE FURNACE
P P P P P
A N D A N D A N D A N D IPING IPING IPING IPING IPING
Pressure
Sw itch Change
1.9" w.c. None
6.0" w.c. None
OR DEATH MAY
. T
NOT INSTALLED HE
SAFE AND PROPER
BE PERFORMED BY A
OF EQUIPMENT
,
USE THE PROPER SIZE
WHEN RUNNING PIPE FROM