Amana AMH8 User manual

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CUS
®
RT6621017r1
April2010
This manual is to be used by qualified, professionally trained HVAC technicians only.
Goodman does not assume any responsibility for property damage or personal injury due
to improper service procedures or services performed by an unqualified person.
®
is a registered trademark of Maytag Corporation or its related companies
and is used under license to Goodman Company, L.P., Houston, TX. All rights reserved. Copyright ©2009-2010 Goodman Company, L.P.
•RefertoServiceManualRS6610004forinstallation,operation,andtroubleshootinginformation.
•Allsafetyinformation must be followedasprovided in the ServiceManual.
•RefertotheappropriatePartsCatalog for part number information.
•Modelnumbers listed on page 3.
AMH8 33-3/8" 80% Gas Furnace
80% AFUE, Twin Comfort™,
Multi-Speed, Upflow/Horizontal (NOx)
TECHNICAL MANUTECHNICAL MANU
TECHNICAL MANUTECHNICAL MANU
TECHNICAL MANUALAL
ALAL
AL

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PRODUCT IDENTIFICATION
2
The model and manufacturing number are used for positive identification of component parts used in manufacturing.
Pleaseusethese numbers when requesting serviceorparts information.
WARNING
WARNING HIGH VOLTAGE!
Disconnect ALL power before servicing or installing this unit. Multiple power
sources may be present. Failure to do so may cause property damage, personal
injury or death.
Installation and repair of this unit
should be performed ONLY by
individuals meeting the require-
ments of an "entry level technician", at a minimum, as
specifiedbytheAir-Conditioning,Heating,andRefrigera-
tion Institute (AHRI). Attempting to install or repair this
unit without such background may result in product
damage, personal injury or death.
Goodman will not be responsible
for any injury or property damage
arising from improper service or service procedures. If
you install or perform service on this unit, you assume
responsibility for any personal injury or property damage
which may result. Many jurisdictions require a license to
install or service heating and air conditioning equipment.
WARNING
WARNING WARNING
WARNING
A M H 8 070 3 A X A A
SUPPLY TYPE:
M: Upflow/Horizontal
FURNACE TYPE:
H: Twin ComfortTM
Multi-Speed
AFUE:
8: 80%
PRODUCT
TYPE:
A: Amana®
Brand
NOMINAL CAPACITY
045: 45,000 BTUH
070: 70,000 BTUH
090: 90,000 BTUH
115: 115,000 BTUH
140: 140,000 BTUH
AIRFLOW
CAPABILITY:
3: 1200
4: 1600
5: 2000
CABINET WIDTH:
A: 14" C: 21"
B: 17 1/2" D: 24 1/2"
ADDITIONAL
FEATURES:
N: Natural Gas
X: Low NOx
MAJOR REVISION:
A: Initial Release
MINOR REVISION:
A: Initial Release

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PRODUCT IDENTIFICATION
3
The model and manufacturing number are used for positive identification of component parts used in manufacturing.
Pleaseusethese numbers when requesting serviceorparts information.
* Indicates minor revision & is not used for order entry or inventory management
AMH80453AXC*
AMH80703AXC*
AMH80704BXC*
AMH80903BXC*
AMH80904BXC*
AMH80905CXC*
AMH81155CXC*
AMH81405DXC*
The United States Environmental Protection Agency (“EPA”) has issued various regulations re-
garding the introduction and disposal of refrigerants introduced into this unit. Failure to follow
these regulations may harm the environment and can lead to the imposition of substantial fines.
These regulations may vary by jurisdiction. Should questions arise, contact your local EPA office.
WARNING
WARNING
Do not connect or use any device
that is not design certified by
Goodman for use with this unit.
Serious property damage, personal injury, reduced unit
performance and/or hazardous conditions may result
from the use of such non-approved devices.
WARNING
WARNING To prevent the risk of property
damage, personal injury, or death,
do not store combustible materials or use gasoline or
other flammable liquids or vapors in the vicinity of this
appliance.
WARNING
WARNING

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4
PRODUCT DESIGN
WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
THIS FURNACE MUST BE CATEGORY IVENTED. DO NOT VENT USING
CATEGORY III VENTING.
1. CategoryIVentingisventingat a non-positive pressure.
A furnace vented as Category I is considered a fan-as-
sisted appliance and the vent system does not have to
be “gas tight.” NOTE: Single stage gas furnaces with
induced draft blowers draw products of combustion
through a heat exchanger allowing, in some instances,
commonventingwithnaturaldraftappliances(i.e.water
heaters).Allinstallationsmust be vented in accordance
with National Fuel Gas Code NFPA 54/ANSI Z223.1 -
latestedition.InCanada, the furnacesmustbeventedin
accordancewiththeNationalStandardofCanada, CAN/
CSAB149.1andCAN/CSAB149.2 - latest editions and
amendments.
NOTE: Theverticalheightof the Category I ventingsystem
must be at least as great as the horizontal length of the
ventingsystem.
2. Linevoltagewiringcanenter throughtherightorleftside
ofthefurnace.Lowvoltagewiring can enter through the
rightor left side offurnace.
3. Conversionkitsforpropane gasandhighaltitudenatural
andpropanegasoperationare available. See High Alti-
tudeDerate chart for details.
GeneralOperation
TheAMH8furnacesareequipped with an electronic ignition
deviceusedtolighttheburnersandaninduceddraftblower
to exhaust combustion products.
Aninterlockswitchprevents furnace operation if theblower
door is not in place. Keep the blower access door in place
exceptforinspection and maintenance.
This furnace is also equipped with a self-diagnosing elec-
tronic control module. In the event a furnace component is
notoperatingproperly,the control module LED will flash on
and off in a factory-programmed sequence, depending on
theproblemencountered. This light canbeviewed through
theobservationwindowin the blower access door.Referto
theTroubleshootingChartforfurtherexplanationof the LED
codesandAbnormalOperation-IntegratedIgnitionControl
section in the Service Instructions for an explanation of the
possibleproblem.
Theratedheatingcapacityof the furnace should be greater
thanor equal to thetotal heat lossof the area tobe heated.
The total heat loss should be calculated by an approved
methodorinaccordance with “ASHRAE Guide” or “Manual
J-LoadCalculations”publishedby the Air ConditioningCon-
tractors of America.
*Obtain from: American National Standards Institute 1430
BroadwayNewYork,NY10018
LocationConsiderations
• The furnace should be as centralized as is practical
with respect to the air distribution system.
• Donotinstallthefurnacedirectly on carpeting, tile, or
combustiblematerialotherthanwood flooring.
• When suspending the furnace from rafters or joists,
use 3/8" threaded rod and 2” x 2” x 3/8” angle as
showninthe InstallationandServiceInstructions. The
length of the rod will depend on the application and
clearancenecessary.
• When installed in a residential garage, the furnace
mustbepositionedso the burners and ignitionsource
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by ve-
hicles.

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5
PRODUCT DESIGN
Accessibility Clearances (Minimum)
Unobstructed front clearance of 24" for servicing is rec-
ommended.
SW B
1036 11
* 24" clearance for serviceability recommended.
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES
** Single Wall Vent (SW) to be used only as a conncetor.
Refer to the venting tables outlined in the Installation Manual for
additional venting requirements.
Vent
Sides TopRear Front*
Note: Inallcases accessibility clearance shall takeprece-
dence over clearances from the enclosure where accessi-
bility clearances are greater. All dimensions are given in
inches.
High Altitude Derate
Whenthis furnace is installedat high altitude, theappropri-
ate High Altitude orifice kit must be installed. This is re-
quiredduetothenatural reduction in the density of boththe
gas fuel and combustion air as altitude increases. The kit
will provide the proper design certified input rate within the
specifiedaltituderange.
2000 3000 4000 4500 5000 6000 7000 8000
US BURNER
ORIFICE 44/55 44/55 45/56 45/56 46/57 47/58 47/58
CANADA BURNER
ORIFICE 44/55 47/57
HA-02 HIGH ALTITUDE CONVERSION KIT REQUIRED
Tabled data is based upon the furnace input being reduced for altitudes above sea level. U.S. 4% per 1,000 feet.
Canada 10% derate for 2,000-4,000 feet.
ELEVATION ABOVE SEA-LEVEL (FEET)
INPUT PER BURNER - 22,500 BTUH NATURAL GAS / 20,000 BTUH L.P.
High altitude kits are purchased according to the installa-
tionaltitudeandusageofeithernaturalorpropanegas.Refer
tothechartaboveforatabular listing of appropriate altitude
rangesandcorrespondingmanufacturer’shighaltitudeNatu-
ralGasandPropaneGaskits.For a tabular listing of appro-
priatealtituderangesandcorrespondingmanufacturer'sHigh
Altitude Pressure Switch kits, refer to either the Pressure
Switch Trip Points & Usage Chart in this manual or the Ac-
cessoryCharts in Service Instructions.

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COMPONENT IDENTIFICATION
6
躀
Pressure Switch
Tubular Heat Exchanger
Flue Pipe Connection
Gas Line Entrance
(Alternate)
Induced Draft Blower
Gas Line
Entrance
Gas Valve
Rollout Limit
Junction Box
Wiring Harness
Grommet
Gas Manifold
Inshot Burner
Blower Door
Interlock Switch
Integrated Control Module
Transformer Circulator Blower
1
2
3
4
5
6
78
9
Upflow/Horizontal
1 TubularHeatExchanger
2 PressureSwitch
3 FluePipeConnection
4 InducedDraftBlower
5 GasLineEntrance
6 GasValve
7 RolloutLimit
8 JunctionBox
9 WiringHarnessGrommet
10 GasManifold
11 InshotBurner
12 Transformer
13 IntegratedControlModule
14 BlowerDoor Interlock Swtich
15 CirculatorBlower
16 GasLine Entrance (Alternate)
Note: Primary Limit Not Shown

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PRODUCT DIMENSIONS
7
AMH8
MODELS A B
AMH80453AX**
AMH80703AX** 14 12-1/2
AMH80704BX**
AMH80903BX**
AMH80904BX** 17-1/2 16
AMH80905CX**
AMH81155CX** 21 19-1/2
AMH81405DX** 24-1/2 23
All dimensions are in inches.
Alt. Gas Inlet
High Voltage Inlet
Low Voltage
Alt. Gas Inlet
Alt. High Voltage
Alt. LowVoltage

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8
PRODUCT DESIGN
MODEL
TRIP POINT
ID BLOWER
PRESSURE
SWITCH
ID BLOWER
PRESSURE
SWITCH
PART #
MODEL
TRIP POINT
ID BLOWER
PRESSURE
SWITCH
ID BLOWER
PRESSURE
SWITCH
PART #
AMH80453AX** -0.60 B1370142 AMH80453AX** -0.60 B1370142
AMH80703AX** -0.60 B1370142 AMH80703AX** -0.60 B1370142
AMH80704BX** -0.60 B1370142 AMH80704BX** -0.47 B1370176
AMH80903BX** -0.60 B1370142 AMH80903BX** -0.75 B1370179
AMH80904BX** -0.60 B1370142 AMH80904BX** -0.75 B1370179
AMH80905CX** -0.70 B1370158 AMH80905CX** -0.60 B1370142
AMH81155CX** -0.70 B1370158 AMH81155CX** -0.70 B1370158
AMH81405DX** -0.75 013070159 AMH81405DX** -0.60 013070142
PRESSURE SWITCH TRIP POINTS
AND USAGE CHART
SQUARE NOSE ROUND NOSE
PRESSURE SWITCH TRIP POINTS
AND USAGE CHART
For installaions in Canada, the AMH8 furnace is certified only to 4,500 ft.
* Negative pressure readings are in inches of water column (*w.c.)
Part Number 0130F00035 20162906 20162903 0130F00036
Open Setting (°F) 220 170 160 180
AMH80453A* 1 --- --- ---
AMH80703A* --- 1 --- ---
AMH80704B* --- 1 --- ---
AMH80903B* --- 1 --- ---
AMH80904B* --- --- 1 ---
AMH80905C* --- --- --- 1
AMH81155C* --- --- --- 1
AMH81405D* --- --- 1 ---
PRIMARY LIMIT
Part Number 10123529
Open Setting (°F) 300
AMH80453AX** 2
AMH80703AX** 2
AMH80704BX** 2
AMH80903BX** 2
AMH80904BX** 2
AMH80905CX** 2
AMH81155CX** 2
AMH81405DX** 2
ROLLOUTLIMIT SWITCHES
Part Number 0130F00038
Open Setting (°F) 120
AMH80453A* 1
AMH80703A* 1
AMH80704B* 1
AMH80903B* 1
AMH80904B* 1
AMH80905C* 1
AMH81155C* 1
AMH81405D* 1
AUXILIARY LIMIT SWITCHES

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9
PRODUCT DESIGN
Coil Matches:
A large array of Amana®brand coils are available for use with the AMH8 furnaces, in either upflow or horizontal applica-
tions. These coils are available in both cased and uncased models (with the option of a field installed TXV expansion
device). These 80% furnaces match up with the existing Amana®brand coils as shown in the chart below.
• All CAPF coils in B, C, & D widths have insulated blank off plates for use with one size smaller furnaces.
• All CAPF coils have a CAUF equivalent.
• All CHPF coils in B, C & D heights have an insulated Z bracket for use with one size smaller furnace.
• All proper coil combinations are subject to being ARI rated with a matched outdoor unit.
Coil Matches (Amana®brand units using R22 and R-410A):
C A P F 1824 A 6 A
PRODUCT
TYPE:
C: Indoor Coil
CABINET FINISH:
U:Unpainted
P: Painted
N:Unpainted Case
EXPANSION
DEVICE:
F: Flowrater
NOMINAL CAPACITY RANGE
@ 13 SEER
1824: 1 1/2 to 2 Tons
3030: 2 1/2 Tons
3636: 3 Tons
3642: 3 to 3 1/2 Tons
4860: 4 & 5 Tons
REVISION
A: Revision
NOMINALWIDTH FOR GAS FURNACE
A:Fits 14" Furnace Cabinet
B: Fits 17 1/2" Furnace Cabinet
C: Fits 21" Furnace Cabinet
D: Fits 24 1/2" Furnace Cabinet
N: Does Not Apply (Horizontal SlabCoils)
APPLICATION
A: Upflow/Downflow Coil
H: Horizontal A Coil
S: Horizontal Slab Coil
REFRIGERANT
CHARGE:
6: R-410A or R-22
2: R-22
4: R-410a

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10
PRODUCT DESIGN
Thermostats:
ThefollowingAmana® brandThermostatsaresuggestedfor use with the AMH8FurnaceModels:
Filters:
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or
CAN/ULCS111standards.Installing this furnace withoutfilterswill void the unit warranty.
RefertoMinimumFilterAreatablestodeterminefilterarearequirement.NOTE:Filterscanalsobeinstalledelsewherein
the duct system such as a central return.
Upflow Filters
FURNACE INPUT FILTER SIZE TYPE
45M 160 in2permanent
70M 241 in2permanent
90M 320 in2permanent
115M 400 in2permanent
140M 370 in2permanent
45M 320 in2disposable
70M 483 in2disposable
90M 640 in2disposable
115M 800 in2disposable
140M 738 in2disposable
PERMANENT NOMINAL 600 F.M. FACE VELOCITY
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY
MINIMUM FILTER SIZES
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in2)
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in2)
All 16 x 25 x 1 400 14 12 x 25 x 1 300
17-1/2 14 x 25 x 1 350
21 16 x 25 x 1 400
24-1/2 20 x 25 x 1 500
Side Return(s) Bottom Return
Thermostat Mech./Digital Programmable Cool Heat
CHT-18-60 Mechanical Yes Yes Yes
CH70TG Digital No Yes Yes
CHSATG Mechanical Yes Yes Yes
H20TWR Mechanical Yes No Yes
THERMOSTATS

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11
PRODUCT DESIGN
TwinComfort™ Configuration & Operation
OFF ON
Blower Switch to
Hi Heat Operation Blower Switch to Hi Heat Operation
T-Stat Satisfied T-Stat Satisfied
Delay Time (5 Min) Delay Time 1-12 Min)
Gas Valve Switch
to 2nd Stage Gas Valve Switch to 2nd Stage
Start Furnace
in Low Stage Start Furnace in Low Stage
Low-Heat Blower Low-Heat Blower
Call for Heat Call for Heat
Safety Circuit Check Safety Circuit Check
MODE DIP SWITCH
TwinComfort™
Note: This furnace is designed to be used
with a single-stage room thermosat.
Start Start
This furnace is capable of the following heating modes:
• Single Stage (Factory Setting)
• Modified Two-Stage
> Fixed 5-Min. Low Stage
> Auto Time (1-12 Min.) Low Stage
To change from the factory single-stage operation,
adjust the dipswitches on the ignition control as follows:
MODE
5 MIN. FIXED
AUTO
2ND STAGE DELAY
DIPSWITCH

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FURNACE SPECIFICATIONS
12
NOTES:
1. For elevations above 2000 feet the rating should be reduced by 4% for each 1000 feet above sea level. The furnace must not be derated,
orifice changes should only be made if necessary for altitude.
2. The total heat loss from the structure as expressed in TOTAL BTU/HR must be calculated by the manufacturers method or in accordance with
the"A.S.H.R.A.E. GUIDE"or "MANUALJ-LOAD CALCULATIONS"publishedbytheAIR CONDITIONINGCONTRACTORS OFAMERICA. Thetotal
heat loss calculated should be equal to or less than the heating capacity. Output based on D.O.E. test procedures, steady state efficiency times
output.
1. These furnaces are manufactured for natural gas operation. Optional kits are available for conversion to propane operation.
2. Minimum Circuit Ampacity calculated as: (1.25 x Circulator Blower Amps) + I.D. Blower Amps. Wire sizes should be determined in accordance
with National Electrical Codes.Extensive wire runs will require larger wire sizes.
3 Maximum Overcurrent protections Device refers to maximum recommended fuse or circult breaker size. May use time delay fuses or HACR-
type circuit breakers of the same sizes as noted.
*Off Heating - This fan delay timing is adjustable (90, 120, 150 or 180 seconds). 150 seconds as shipped.
MODEL
AMH80453AX** AMH80703AX** AMH80704BX** AMH80903BX** AMH80904BX** AMH80905CX** AMH81155CX** AMH81405DX**
Input,Natural Gas(BTUH) 45,000 70,000 70,000 90,000 90,000 90,000 115,000 140,000
Output, Natural Gas (BTUH) 136,000 56,000 56,000 72,000 72,000 72,000 92,000 112,000
Output,LP(BTUH) 32,000 48,000 48,000 64,000 64,000 64,000 80,000 96,000
A.F.U.E. 80.0% 80.0% 80.0% 80.0% 80.0% 80.0% 80.0% 80.0%
Rated External Static (" w.c.) 0.20 - 0.50 0.20 - 0.50 0.20 - 0.50 0.20 - 0.50 0.20 - 0.50 0.20 - 0.50 0.20 - 0.50 0.20 - 0.50
Temperature Rise (°F) 25 - 55 25 -55 20 - 50 35 - 65 35 - 65 35 - 65 35 - 65 40 - 70
Pressure Switch Trip Point (" w.c.) -0.70 -0.70 -0.75 -0.75 -0.75 -0.75 -0.90 -0.80
Blower Wheel (D" x W") 10x6 10x6 10x8 10x8 10x8 10x10 10x10 11x10
Blower Horsepower 1/3 1/3 1/2 1/3 1/2 1/2 1/2 3/4
Blower Speeds 4 4 4 4 4 4 4 4
Max CFM @ 0.5 E.S.P. 1280 1100 1610 1439 1738 1854 1902 2084
Power Supply(Volts/Hz/Ph) 115/60/1 115/60/1 115/60/1 115/60/1 115/60/1 115/60/1 115/60/1 115/60/1
Minimum Circuit Ampacity (MCA) 28.1 8.1 12.5 8.1 12.5 12.5 12.5 14.7
Maximum Overcurrent Device 315 15 15 15 15 15 15 15
Transformer (VA) 40 40 40 40 40 40 40 40
Primary LimitSetting (°F) 220 170 170 170 160 180 180 160
Auxiliary Limit Setting (°F) 120 120 120 120 120 120 120 120
Rollout Limit Setting (°F) 300 300 300 300 300 300 300 300
Fan Delay On Heating 30 30 30 30 30 30 30 30
OffHeating * 150 150 150 150 150 150 150 150
Fan Delay On Cooling 5 5 5 5 5 5 5 5
OffCooling 45 45 45 45 45 45 45 45
Fan Delay On - Fan Only 0 0 0 0 0 0 0 0
Gas Supply Pressure
(
Natural/Pro
p
ane
)
(
" w.c.
)
7 / 11 7 / 11 7 / 11 7 /11 7 / 11 7 / 11 7 /11 7 / 11
Manifold Pressure
(
Natural/Pro
p
ane
)
(
" w.c.
)
3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10
Orifice Size (Natural/Propane) 43 / 55 43 / 55 43 / 55 43 / 55 43 / 55 43 / 55 43 / 55 43 / 55
Number of Burners 23344456
Vent Connector Diameter (inches) 4 4 4 4 4 4 4 4
Shipping Weight (lbs.) 115 125 136 146 146 154 154 153

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BLOWER PERFORMANCE SPECIFICATIONS
13
NOTES:
1. CFM in chart is without filters(s). Filters do not ship with this furnace, but must be provided by the installer.
2. All furnaces ship as high speed cooling. Installer must adjust blower cooling speed as needed.
3. For most jobs, about 400 CFM per ton when cooling is desirable.
4. INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.
5. The chart is for information only. For satisfactory operation, external static pressure must not exceed value shown on rating plate. The shaded area indicates
ranges in excess of maximum external static pressure allowed when heating. The data for 0.6" w.c. to 0.8" w.c. is shown for air conditioning purposes only.
6 The dashed (---) areas indicate a temperature rise not recommended for this model.
7. The above chart is for U.S. furnaces installed at 0-2000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise at a
particular CFM, while the ESP at that CFM will be lower.
TonsAC
at 0.5" 0.6 0.7 0.8
ESP CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM
HIGH 3.0 152122146623141424137324129826124311641075
*M(H/S)80453A*** MED 2.5 1160291160291132291121301082311042997925
(MEDIUM) MED-LO 2.0 961 35 955 35 948 35 932 36 913 37 882 821 803
LOW 1.5 781 43 785 42 781 43 773 43 761 44 745 716 668
HIGH 3.0 14223613523813074011974311574510921075983
*M(H/S)80703A*** MED 2.5 109847108148105149103950102151 983924868
(MEDIUM) MED-LO 2.0 919 56 913 57 892 58 847 ---- 829 ---- 818 792 728
LOW 1.5 758 ---- 741 ---- 741 ---- 733 ---- 699 ---- 677 649 626
HIGH 4.0 2134----210025204225197526188328178617001601
*M(H/S)80704B*** MED 3.5 166831166331165631164532161632154914921391
(MEDIUM) MED-LO 3.0 141937142636142636143236141937137813281261
LOW 2.5 1134 46 1145 45 1166 44 1171 44 1160 45 1144 1111 1071
HIGH 3.0 160741157242154743149845144846139013021222
*M(H/S)80903B*** MED 2.5 11595811565811455811275911086010751033957
(MEDIUM) MED-LO 2.0 938 ---- 916 ---- 916 ---- 900 ---- 889 ---- 865 829 785
LOW 1.5 785 ---- 766 ---- 743 ---- 730 ---- 709 ---- 683 666 604
HIGH 4.0 2051----1983----189535181237172539162715301439
*M(H/S)80904B*** MED 3.5 173638170839165240161141154043147513941307
(MEDIUM) MED-LO 3.0 149345166840145946142947138948133912741204
LOW 2.5 1200 56 1185 56 1180 56 1173 57 1158 58 1125 1125 1080
HIGH 5.0 2290 ---- 2229 ---- 2155 ---- 2047 ---- 1960 ---- 1837 1712 1584
*M(H/S)80905C*** MED 4.0 185236182037177738171939164141156714691382
(MEDIUM) MED-LO 3.5 161541159242155643151644147045140513461235
LOW 3.0 1290 52 1285 52 1265 53 1235 54 1214 55 1174 1044 904
HIGH 5.0 232337222538212040204042197443180116881577
*M(H/S)81155C*** MED 4.0 185846184746179947174449167451157714931399
(MEDIUM) MED-LO 3.5 159653158754157154155255149357139713261217
LOW 3.0 1291 ---- 1272 ---- 1261 ---- 1257 ---- 1205 ---- 1168 1118 1060
HIGH 5.0 246942238943230045222347213149202719021786
*M(H/S)81405D*** MED 4.0 157566155867154567151369150069141913541271
(MEDIUM) MED-LO 3.5 1402 ---- 1380 ---- 1343 ---- 1319 ---- 1296 ---- 1245 1183 1106
LOW 3.0 1200 ---- 1186 ---- 1161 ---- 1127 ---- 1082 ---- 1042 995 926
(CFM & Temperature Rise vs. External Static Pressure)
0.1 0.2 0.3 0.4 0.5
Model
Heating Speed
AsShipped
Motor
Speed
EXTERNAL STATIC PRESSURE (Inches Water Column)
()

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BLOWER PERFORMANCE SPECIFICATIONS
14
30 40 50 60 70 80 90 110 120
100 130 140 150
100
90 80
70 60 50
40 30 20
10
OUTPUT BTU/HR x 1000
BTU OUTPUT vs TEMPERATURE RISE CHART
TE
M
PE
R
ATU
R
E
R
ISE
600 CFM
700
900
1000
1100
1200
1400
1600
1800
2000
2200
2400 CFM
FORMULAS
BTU OUTPUT = CFM x 1.08 x RISE
RISE = BTU OUTPUT
1.08 ÷ CFM
800

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15
WIRING DIAGRAMS
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
AMH8_CA/CB
CAP
BK (HI)
A
UXILIARY
PROPERLYPOLARIZEDANDGROUNDED.
SERVICING.WIRING TO UNIT MUST BE
WARNING:DISCONNECT POWER BEFORE
XFMR
BK
115V
24V
BR
LIMITS
WH (N)
RD (LOW)
OR(MED LOW)
BL (MED)
BLOWER
CICULATOR
24V THERMOSTAT CONNECTIONS
RO2
(
11
)
GND
(
8
)
HUMIDIFIER
XFMR (6) GND
G
C
W
YTO
MICRO
R
MVL
(
2
)
MVC
(
9
)
PS
(
10
)
PSO
(
4
)
HLI
(
7
)
HLO
(
1
)
CONTROL MODULE
INTEGRATED
NO
SWITCH
PRESSURE
ID BLOWER
VALVE
M1
GAS
C2
C
115 VAC
FLAME SENSOR
FP
XFMR-H
XFMR
(
3
)
RO1
(
5
)
24 VAC
HOT SURFACE
IGNITER
INTEGRATED CONTROL MODULE
BR
BR
IGN
IND
ID
BLWR
CIRCULATOR
BLWR
TRANSFORMER
40 VA
XFMR-N
INTEGRATED CONTROL MODULE
CIR-N
5. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.
ON SOME MODELS
HUMIDIFIER
24 VAC
INDUCEDDRAFT
°C. USE COPPER CONDUCTORS ONLY.
BLOWERCOMPARTMENT
BURNER COMPARTMENT
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE
3. IF ANY OF THE ORIGINAL WIREAS SUPPLIED WITH THE FURNACE MUST BE
CORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)
REQUIREMENTS SO AS TO PROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THE
4. BLOWER SPEEDS SHOULD BE ADJUSTED BY INSTALLER TO MATCH THE INSTALLATION
INTEGRATED CONTROL
INTERNAL TO
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.
1. SET HEATANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
BLOWER
PRIMARY LIMIT
WH
GR
BK
IGNITER
SURFACE
HOT
PU
RD
15 PIN PLUG
C
NO
SWITCH
PRESSURE
BR
SENSOR
FLAME
BK
WH
ROLLOUT LIMITS
RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND
SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)
7 FLASHES =LOW FLAME SIGNAL
5 FLASHES =FLAME SENSE WITHOUT GAS VALVE
4 FLASHES = OPEN HIGH LIMIT
3 FLASHES = PRESSURE SWITCH STUCK OPEN
2 FLASHES = PRESSURE SWITCH STUCK CLOSED
STEADY ON = NORMAL OPERATION
OFF = CONTROL FAILURE
5
1 FLASH =
0
1
2
3
4
PU
6 FLASHES = OPEN ROLLOUT OR OPEN FUSE
COLOR CODES:
PU PURPLE
OR ORANGE
YL YELLOW
6
7
8
BK BLACK
GR GREEN
BR BROWN
PK PINK
RD RED
GY GRAY
BL BLUE
WH WHITE
PU
RATING OF AT LEAST 105
NOTES:
TO 115VAC/ 1Ø /60 HZ POWER SUPPLYWITH
OVERCURRENT
PROTECTION DEVICE
JUNCTION BOX
SWITCH
LINE-H
DOOR
LGND
LINE-N
DISCONNECT
N
SWITCH (TEMP.)
FIELD
SPLICE
SWITCH
(PRESS.)
PROT.
DEVICE
OVERCURRENT
EQUIPMENT
GND
TERMINAL
JUNCTION
HI
VOLTAGE FIELD
HI
VOLTAGE (115V)
LOW
VOLTAGE FIELD
LOW
VOLTAGE (24V)
PLUG CONNECTION
IGNITER
FIELD GND
IND-N
IGN-N
JUNCTION
BOX
OVERCURRENT PROTECTION
POWER SUPPLY WITH
TO 115 VAC/ 1/60HZ
GND
LINE-N
LINE H
DEVICE
DOOR SWITCH
WH
BK
SWITCH LOCATED IN BLOWER
COMPARTMENT ON SOME MODELS
RD
RD
BL
PU
YL
OR
BR
(SINGLE CONTROL ON SOME MODELS)
PARK
78
654
CGRWY
5 MIN
2 STG MODE
2
1
321
CONTROL MODULE
INTEGRATED
PM
1HIC32
2 STAGE
GAS VALVE
WH
24 VAC
HUMIDIFIER
RD
HI
MVH (12)
A
IR CLEANER
ELECTRONIC EAC-N
EAC-H
6.TORECALLTHELAST5FAULTS,MOSTRECENTTOLEASTRECENT,DEPRESSSWITCH
FORMORETHAN2SECONDSWHILEINSTANDBY(NOTHERMOSTATINPUTS).
WH BL
BR
WH
BL
BK
BK
YL
YL
RD
YL YL
PU
OR
WH
WH
WH
WH
YL
BL
RD
C
8 FLASHES = CHECK IGNITER OR IMPROPER GROUND

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16
WIRING DIAGRAMS
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
CAP
BK(HI)
AUXILIARY
PROPERLYPOLARIZEDANDGROUNDED.
SERVICING.WIRINGTOUNITMUSTBE
WARNING:DISCONNECTPOWERBEFORE
XFMR
BK
115V
24V
BR
LIMITS
WH(N)
RD(LOW)
OR(MEDLOW)
BL(MED)
BLOWER
CICULATOR
24VTHERMOSTATCONNECTIONS
RO2(11) LIMIT
GND(8)
HUMIDIFIER
XFMR(6) GND
G
C
W
YTO
MICRO
R
MVL(2)
MVC(9)
AUXILIARY
LIMITCONTROLS
PS(10)
PSO(4)
HLI(7)
HLO(1)
CONTROLMODULE
INTEGRATED
NO
SWITCH
PRESSURE
IDBLOWER
VALVE
M1
GAS
C2
C
AUTORESET
PRIMARY
MANUALRESETROLLOUT
LIMITCONTROL(S)
115VAC
FLAMESENSOR
FP
XFMR-H
XFMR(3)
RO1(5)
24VAC
HOTSURFACE
IGNITER
INTEGRATEDCONTROLMODULE
BR
BR
COOL-H
IGN
IND
ID
BLWR
CIRCULATOR
HEAT-H
BLWR
TRANSFORMER
40VA
CONTROL
XFMR-N
INTEGRATEDCONTROLMODULE
CIR-N
0140F00662 REV.A
5.UNITMUSTBEPERMANENTLYGROUNDEDANDCONFORMTON.E.C.ANDLOCALCODES.
ONSOMEMODELS
HUMIDIFIER
24VAC
INDUCEDDRAFT
°C.USECOPPERCONDUCTORSONLY.
BLOWERCOMPARTMENT
BURNERCOMPARTMENT
REPLACED,ITMUSTBEREPLACEDWITHWIRINGMATERIALHAVINGATEMPERATURE
3.IFANYOFTHEORIGINALWIREASSUPPLIEDWITHTHEFURNACEMUSTBE
CORRECTCOOLINGCFM.(SEESPECSHEETFORAIRFLOWCHART)
REQUIREMENTSSOASTOPROVIDETHECORRECTHEATINGTEMPERATURERISEANDTHE
4.BLOWERSPEEDSSHOULDBEADJUSTEDBYINSTALLERTOMATCHTHEINSTALLATION
INTEGRATEDCONTROL
INTERNALTO
2.MANUFACTURER'SSPECIFIEDREPLACEMENTPARTSMUSTBEUSEDWHENSERVICING.
1.SETHEATANTICIPATORONROOMTHERMOSTATAT0.7AMPS.
BLOWER
PRIMARYLIMIT
WH
GR
BK
IGNITER
SURFACE
HOT
PU
RD
15PINPLUG
C
NO
SWITCH
PRESSURE
BR
SENSOR
FLAME
BK
WH
ROLLOUTLIMITS
RAPIDFLASHES=REVERSED115VACPOLARITY/VERIFYGND
SYSTEMLOCKOUT(RETRIES/RECYCLESEXCEEDED)
7FLASHES=LOWFLAMESIGNAL
5FLASHES=FLAMESENSEWITHOUTGASVALVE
4FLASHES=OPENHIGHLIMIT
3FLASHES=PRESSURESWITCHSTUCKOPEN
2FLASHES=PRESSURESWITCHSTUCKCLOSED
STEADYON=NORMALOPERATION
OFF =CONTROLFAILURE
5
1FLASH =
0
1
2
3
4
PU
6FLASHES=OPENROLLOUTOROPENFUSE
COLORCODES:
PUPURPLE
OR ORANGE
YLYELLOW
6
7
8
BKBLACK
GRGREEN
BRBROWN
PKPINK
RD RED
GYGRAY
BLBLUE
WH WHITE
PU
RATINGOFATLEAST105
NOTES:
OVERCURRENTPROTECTIONDEVICE
JUNCTIONBOX
MUSTBE
WARNING:
SWITCH
WIRINGTOUNIT
BEFORESERVICING.
DISCONNECTPOWER
LINE-H
DOOR
ANDGROUNDED.
POLARIZED
PROPERLY
LGND
LINE-N
DISCONNECT
N
SWITCH(TEMP.)
FIELDSPLICE
SWITCH(PRESS.)
PROT.DEVICE
OVERCURRENT
EQUIPMENTGND
TERMINAL
JUNCTION
HIVOLTAGEFIELD
HIVOLTAGE(115V)
LOWVOLTAGEFIELD
LOWVOLTAGE(24V)
PLUGCONNECTION
IGNITER
FIELDGND
IND-N
IGN-N
JUNCTION
BOX
OVERCURRENTPROTECTION
POWERSUPPLYWITH
TO115VAC/1/60HZ
GND
LINE-N
LINEH
DEVICE
DOORSWITCH
WH
BK
SWITCHLOCATEDINBLOWER
COMPARTMENTONSOMEMODELS
RD
RD
BL
PU
YL
OR
BR
(SINGLECONTROLONSOMEMODELS)
(SINGLECONTROLONSOMEMODELS)
DIAGNOSTIC
LED LOHEAT-H
PARK
SEENOTE6
COOL-HHIHEAT-H
978
654
12
CGRWY
5MIN
2STG
100SEC
1STG
AUTO
150SEC MODE
2NDSTGDLY
HTOFFDLY
2
1
EAC-HLINE-HXFMR-H
LINENEUTRAL
FS
1110
321
CONTROLMODULE
INTEGRATED
FUSE
PM
1HIC23
2STAGE
GASVALVE
(HONEYWELL)
WH
24VAC
HUMIDIFIER
RD
HI
MVH(12)
HI
LO
HEAT-H
AIRCLEANER
ELECTRONIC EAC-N
EAC-H
6.TORECALLTHELAST5FAULTS,MOSTRECENTTOLEASTRECENT,DEPRESSSWITCH
FORMORETHAN2SECONDSWHILEINSTANDBY(NOTHERMOSTATINPUTS).
WH BL
BR
WH
BL
BK
BK
YL
YL
RD
YL YL
PU
OR
WH
WH
WH
WH
YL
BL
RD
C
8FLASHES=CHECKIGNITERORIMPROPERGROUND
AMH8_CC

17
SCHEMATICS
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
TYPICALSCHEMATIC
AMH8____** MODELFURNACES
WR50M56-289INTEGRATED IGNITION CONTROL
.0005
3M K4
K2
HI
HEAT
COOL PARK CIR
NEU
K5
GAS VALVE
HIGH
LIMIT AUX
LIMIT
PRESSURE
SWITCH
FLAME
SENSOR
PROBE
IGNITOR
FP IGN GND MV MLV PS HLO HLI
CIRCULATOR
BLOWER
XFMR
HOT
XFMR
NEU
24 VAC
TH
RO1
RO2
R
TR
C
Y
G
W
COMPRESSOR
CONTACTOR
COIL
THERMOSTAT
R
Y
G
W
INDUCER
IND
ELECTRONIC
AIR CLEANER
EAC EAC
NEU
K6 ROLLOUT
SWITCH
K1
FACTORY
JUMPER
FACTORY
JUMPER
PSO
K2
K3
K3
LO
HEAT
COM
PM
HI
2-STAGE
K7
This schematic is for reference only. Not all wiring is as shown above. Always refer to the appropriate wiring diagram for the unit being serviced.