Amana Furnace AMH User Manual

TECHNICAL MANUAL  
AMH8 33-3/8" 80% Gas Furnace  
80% AFUE, Twin Comfort,  
Multi-Speed, Upflow/Horizontal (NOx)  
Refer to Service Manual RS6610004 for installation, operation, and troubleshooting information.  
All safety information must be followed as provided in the Service Manual.  
Refer to the appropriate Parts Catalog for part number information.  
Model numbers listed on page 3.  
®
US  
C
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.  
RT6621017r1  
April 2010  
®
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.  
 
PRODUCT IDENTIFICATION  
The model and manufacturing number are used for positive identification of component parts used in manufacturing.  
Please use these numbers when requesting service or parts information.  
AMH80453AXC*  
AMH80703AXC*  
AMH80704BXC*  
AMH80903BXC*  
AMH80904BXC*  
AMH80905CXC*  
AMH81155CXC*  
AMH81405DXC*  
* Indicates minor revision & is not used for order entry or inventory management  
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  
WARNING  
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.  
Do not connect or use any device  
To prevent the risk of property  
WARNING  
WARNING  
that is not design certified by  
Goodman for use with this unit.  
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.  
Serious property damage, personal injury, reduced unit  
performance and/or hazardous conditions may result  
from the use of such non-approved devices.  
3
 
PRODUCT DESIGN  
General Operation  
The AMH8 furnaces are equipped with an electronic ignition  
device used to light the burners and an induced draft blower  
to exhaust combustion products.  
WARNING  
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,  
T
THIS FURNACE MUST BE ATEGORY VENTED.  
O NOT VENT USING  
D
C
I
An interlock switch prevents furnace operation if the blower  
door is not in place. Keep the blower access door in place  
except for inspection and maintenance.  
CATEGORY III VENTING.  
1. Category I Venting is venting at 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,  
common venting with natural draft appliances (i.e. water  
heaters). All installations must be vented in accordance  
with National Fuel Gas Code NFPA 54/ANSI Z223.1 -  
latest edition. In Canada, the furnaces must be vented in  
accordance with the National Standard of Canada, CAN/  
CSA B149.1 and CAN/CSA B149.2 - latest editions and  
amendments.  
This furnace is also equipped with a self-diagnosing elec-  
tronic control module. In the event a furnace component is  
not operating properly, the control module LED will flash on  
and off in a factory-programmed sequence, depending on  
the problem encountered. This light can be viewed through  
the observation window in the blower access door. Refer to  
the Troubleshooting Chart for further explanation of the LED  
codes and Abnormal Operation - Integrated Ignition Control  
section in the Service Instructions for an explanation of the  
possible problem.  
The rated heating capacity of the furnace should be greater  
than or equal to the total heat loss of the area to be heated.  
The total heat loss should be calculated by an approved  
method or in accordance with “ASHRAE Guide” or “Manual  
J-Load Calculations” published by the Air Conditioning Con-  
tractors of America.  
NOTE: The vertical height of the Category I venting system  
must be at least as great as the horizontal length of the  
venting system.  
2. Line voltage wiring can enter through the right or left side  
of the furnace. Low voltage wiring can enter through the  
right or left side of furnace.  
*Obtain from: American National Standards Institute 1430  
Broadway New York, NY 10018  
3. Conversion kits for propane gas and high altitude natural  
and propane gas operation are available. See High Alti-  
tude Derate chart for details.  
Location Considerations  
The furnace should be as centralized as is practical  
with respect to the air distribution system.  
Do not install the furnace directly on carpeting, tile, or  
combustible material other than wood flooring.  
When suspending the furnace from rafters or joists,  
use 3/8" threaded rod and 2” x 2” x 3/8” angle as  
shown in the Installation and Service Instructions. The  
length of the rod will depend on the application and  
clearance necessary.  
When installed in a residential garage, the furnace  
must be positioned so the burners and ignition source  
are located not less than 18 inches (457 mm) above  
the floor and protected from physical damage by ve-  
hicles.  
4
 
PRODUCT DESIGN  
Accessibility Clearances (Minimum)  
High Altitude Derate  
Unobstructed front clearance of 24" for servicing is rec- When this furnace is installed at high altitude, the appropri-  
ommended.  
ate High Altitude orifice kit must be installed. This is re-  
quired due to the natural reduction in the density of both the  
gas fuel and combustion air as altitude increases. The kit  
will provide the proper design certified input rate within the  
specified altitude range.  
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES  
Vent  
Sides  
1
Rear  
0
Front*  
3
Top  
1
SW  
6
B
1
INPUT PER BURNER  
-
22,500 BTUH NATURAL GAS / 20,000 BTUH L.P.  
ELEVATION ABOVE SEA-LEVEL (FEET)  
*
24" clearance for serviceability recommended.  
** 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.  
2000  
3000  
4000  
4500  
5000  
6000  
7000  
8000  
US BURNER  
ORIFICE  
44/55  
44/55  
44/55  
45/56  
45/56  
46/57  
47/58  
47/58  
CANADA BURNER  
ORIFICE  
47/57  
Note: In all cases accessibility clearance shall take prece-  
dence over clearances from the enclosure where accessi-  
bility clearances are greater. All dimensions are given in  
inches.  
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.  
High altitude kits are purchased according to the installa-  
tion altitude and usage of either natural or propane gas. Refer  
to the chart above for a tabular listing of appropriate altitude  
ranges and corresponding manufacturer’s high altitude Natu-  
ral Gas and Propane Gas kits. For a tabular listing of appro-  
priate altitude ranges and corresponding manufacturer's High  
Altitude Pressure Switch kits, refer to either the Pressure  
Switch Trip Points & Usage Chart in this manual or the Ac-  
cessory Charts in Service Instructions.  
5
 
COMPONENT IDENTIFICATION  
Tubular Heat Exchanger  
1
2 Pressure Switch  
3
Flue Pipe Connection  
Induced Draft Blower  
4
Gas Line  
Entrance  
5
6
Gas Valve  
7
Rollout Limit  
8
Junction Box  
Wiring Harness  
Grommet  
9
Gas Manifold  
Inshot Burner  
Gas Line Entrance  
(Alternate)  
Transformer  
Circulator Blower  
Blower Door  
Interlock Switch  
Note: Primary Limit Not Shown  
Integrated Control Module  
Upflow/Horizontal  
1
2
3
4
5
6
7
8
Tubular Heat Exchanger  
9 Wiring Harness Grommet  
Pressure Switch  
Flue Pipe Connection  
Induced Draft Blower  
Gas Line Entrance  
Gas Valve  
10 Gas Manifold  
11 Inshot Burner  
12 Transformer  
13 Integrated Control Module  
14 Blower Door Interlock Swtich  
15 Circulator Blower  
Rollout Limit  
Junction Box  
16 Gas Line Entrance (Alternate)  
6
 
PRODUCT DIMENSIONS  
AMH8  
Alt. Gas Inlet  
Alt. Gas Inlet  
Alt. High Voltage  
Alt. LowVoltage  
High Voltage Inlet  
Low Voltage  
MODELS  
A
B
AMH80453AX**  
AMH80703AX**  
14  
12-1/2  
AMH80704BX**  
AMH80903BX**  
AMH80904BX**  
17-1/2  
16  
AMH80905CX**  
AMH81155CX**  
21  
19-1/2  
23  
AMH81405DX**  
24-1/2  
All dimensions are in inches.  
7
 
PRODUCT DESIGN  
PRESSURE SWITCH TRIP POINTS  
PRESSURE SWITCH TRIP POINTS  
AND USAGE CHART  
AND USAGE CHART  
SQUARE NOSE  
ROUND NOSE  
TRIP POINT  
ID BLOWER  
PRESSURE  
SWITCH  
ID BLOWER  
PRESSURE  
SWITCH  
TRIP POINT  
ID BLOWER  
PRESSURE  
SWITCH  
ID BLOWER  
PRESSURE  
SWITCH  
PART #  
MODEL  
MODEL  
PART #  
AMH80453AX**  
AMH80703AX**  
AMH80704BX**  
AMH80903BX**  
AMH80904BX**  
AMH80905CX**  
AMH81155CX**  
AMH81405DX**  
-0.60  
-0.60  
-0.60  
-0.60  
-0.60  
-0.70  
-0.70  
-0.75  
B1370142  
B1370142  
B1370142  
B1370142  
B1370142  
B1370158  
B1370158  
013070159  
AMH80453AX**  
AMH80703AX**  
AMH80704BX**  
AMH80903BX**  
AMH80904BX**  
AMH80905CX**  
AMH81155CX**  
AMH81405DX**  
-0.60  
-0.60  
-0.47  
-0.75  
-0.75  
-0.60  
-0.70  
-0.60  
B1370142  
B1370142  
B1370176  
B1370179  
B1370179  
B1370142  
B1370158  
013070142  
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.)  
PRIMARY LIMIT  
Part Number  
0130F00035  
20162906  
20162903  
0130F00036  
Open Setting (°F)  
220  
170  
160  
180  
AM H80453A*  
AM H80703A*  
AMH80704B*  
AMH80903B*  
AMH80904B*  
AMH80905C*  
AMH81155C*  
AMH81405D*  
1
---  
1
---  
---  
---  
---  
1
---  
---  
---  
---  
---  
1
---  
---  
---  
---  
---  
---  
---  
1
1
---  
---  
---  
---  
---  
---  
1
1
---  
ROLLOUT LIMIT SWITCHES  
AUXILIARY LIMIT SWITCHES  
Part Number  
10123529  
Part Number  
0130F00038  
Open Setting (°F)  
Open Setting (°F)  
300  
2
120  
1
AMH80453AX**  
AMH80703AX**  
AMH80704BX**  
AMH80903BX**  
AMH80904BX**  
AMH80905CX**  
AMH81155CX**  
AMH81405DX**  
AMH80453A*  
AMH80703A*  
AMH80704B*  
AMH80903B*  
AMH80904B*  
AMH80905C*  
AMH81155C*  
AMH81405D*  
2
1
2
1
2
1
2
2
2
2
1
1
1
1
8
 
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.  
Coil Matches (Amana® brand units using R22 and R-410A):  
C
A
P
F 1824 A  
6
A
EXPANSION  
DEVICE:  
F: Flowrater  
REVISION  
A: Revision  
PRODUCT  
TYPE:  
C: Indoor Coil  
REFRIGERANT  
CHARGE:  
6: R-410A or R-22  
2: R-22  
CABINET FINISH:  
U: Unpainted  
P: Painted  
4: R-410a  
N: Unpainted Case  
NOMINAL WIDTH 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 Slab Coils)  
APPLICATION  
A: Upflow/Downflow Coil  
H: Horizontal A Coil  
S: Horizontal Slab Coil  
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  
• 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.  
9
 
PRODUCT DESIGN  
Thermostats:  
The following Amana® brand Thermostats are suggested for use with the AMH8 Furnace Models:  
THERMOSTATS  
Thermostat  
CHT-18-60  
CH70TG  
Mech./Digital  
Mechanical  
Digital  
Programmable  
Cool  
Yes  
Yes  
Yes  
No  
Heat  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
CHSATG  
H20TWR  
Mechanical  
Mechanical  
Yes  
Yes  
Filters:  
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or  
CAN/ULCS111 standards. Installing this furnace without filters will void the unit warranty.  
Upflow Filters  
Side Return(s)  
Bottom Return  
Approx.  
Approx.  
Flow Area  
Cabinet  
Width  
(in.)  
Nominal  
Filter Size  
(in.)  
Cabinet  
Width  
(in.)  
Nominal  
Filter Size  
(in.)  
Flow Area  
(in2)  
(in2)  
300  
350  
400  
500  
All  
16 x 25 x 1  
400  
14  
12 x 25 x 1  
14 x 25 x 1  
16 x 25 x 1  
20 x 25 x 1  
17-1/2  
21  
24-1/2  
RefertoMinimumFilterAreatablestodeterminefilterarearequirement. NOTE:Filterscanalsobeinstalledelsewherein  
the duct system such as a central return.  
MINIMUM FILTER SIZES  
FURNACE INPUT  
FILTER SIZE  
160 in2  
241 in2  
320 in2  
400 in2  
370 in2  
320 in2  
483 in2  
640 in2  
800 in2  
738 in2  
TYPE  
45M  
permanent  
70M  
90M  
permanent  
permanent  
permanent  
permanent  
disposable  
disposable  
disposable  
disposable  
disposable  
115M  
140M  
45M  
70M  
90M  
115M  
140M  
PERMANENT NOMINAL 600 F.M. FACE VELOCITY  
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY  
10  
 
PRODUCT DESIGN  
TwinComfort™ Configuration & Operation  
TwinComfort™  
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:  
OFF  
ON  
MODE  
MODE DIP SWITCH  
5 MIN. FIXED  
AUTO  
2ND STAGE DELAY  
DIPSWITCH  
Note: This furnace is designed to be used  
with a single-stage room thermosat.  
Start  
Start  
Call for Heat  
Call for Heat  
Safety Circuit Check  
Safety Circuit Check  
Start Furnace  
in Low Stage  
Start Furnace  
in Low Stage  
Low-Heat Blower  
Low-Heat Blower  
Delay Time (5 Min)  
Delay Time 1-12 Min)  
Gas Valve Switch  
to 2nd Stage  
Gas Valve Switch  
to 2nd Stage  
Blower Switch to  
Hi Heat Operation  
Blower Switch to  
Hi Heat Operation  
T-Stat Satisfied  
T-Stat Satisfied  
11  
 
FURNACE SPECIFICATIONS  
MODEL  
Input, Natural Gas (BTUH)  
Output, Natural Gas (BTUH) 1  
Output, LP (BTUH)  
45,000  
36,000  
32,000  
80.0%  
0.20 - 0.50  
25 - 55  
-0.70  
10x6  
1/3  
70,000  
56,000  
48,000  
80.0%  
0.20 - 0.50  
25 -55  
-0.70  
10x6  
1/3  
70,000  
56,000  
48,000  
80.0%  
0.20 - 0.50  
20 - 50  
-0.75  
10x8  
1/2  
90,000  
72,000  
64,000  
80.0%  
0.20 - 0.50  
35 - 65  
-0.75  
10x8  
1/3  
90,000  
72,000  
64,000  
80.0%  
0.20 - 0.50  
35 - 65  
-0.75  
10x8  
1/2  
90,000  
72,000  
64,000  
80.0%  
0.20 - 0.50  
35 - 65  
-0.75  
10x10  
1/2  
115,000  
92,000  
80,000  
80.0%  
0.20 - 0.50  
35 - 65  
-0.90  
10x10  
1/2  
140,000  
112,000  
96,000  
80.0%  
0.20 - 0.50  
40 - 70  
-0.80  
11x10  
3/4  
A.F.U.E.  
Rated External Static (" w.c.)  
Temperature Rise (°F)  
Pressure Switch Trip Point (" w.c.)  
Blower Wheel (D" x W")  
Blower Horsepower  
Blower Speeds  
4
4
4
4
4
4
4
4
Max CFM @ 0.5 E.S.P.  
Power Supply (Volts/Hz/Ph)  
1280  
115/60/1  
8.1  
1100  
115/60/1  
8.1  
1610  
115/60/1  
12.5  
1439  
115/60/1  
8.1  
1738  
115/60/1  
12.5  
15  
1854  
115/60/1  
12.5  
1902  
115/60/1  
12.5  
15  
2084  
115/60/1  
14.7  
Minimum Circuit Ampacity (MCA) 2  
Maximum Overcurrent Device 3  
Transformer (VA)  
15  
15  
15  
15  
15  
15  
40  
40  
40  
40  
40  
40  
40  
40  
Primary Limit Setting (°F)  
Auxiliary Limit Setting (°F)  
Rollout Limit Setting (°F)  
Fan Delay On Heating  
Off Heating *  
220  
170  
170  
170  
160  
180  
180  
160  
120  
120  
120  
120  
120  
120  
120  
120  
300  
300  
300  
300  
300  
300  
300  
300  
30  
30  
30  
30  
30  
30  
30  
30  
150  
150  
150  
150  
150  
150  
150  
150  
Fan Delay On Cooling  
Off Cooling  
5
5
5
5
5
5
5
5
45  
45  
45  
45  
45  
45  
45  
45  
Fan Delay On - Fan Only  
Gas Supply Pressure  
(Natural/Propane) (" w.c.)  
Manifold Pressure  
0
0
0
0
0
0
0
0
7 / 11  
3.5 / 10  
43 / 55  
2
7 / 11  
3.5 / 10  
43 / 55  
3
7 / 11  
3.5 / 10  
43 / 55  
3
7 / 11  
3.5 / 10  
43 / 55  
4
7 / 11  
3.5 / 10  
43 / 55  
4
7 / 11  
3.5 / 10  
43 / 55  
4
7 / 11  
3.5 / 10  
43 / 55  
5
7 / 11  
3.5 / 10  
43 / 55  
6
(Natural/Propane) (" w.c.)  
Orifice Size (Natural/Propane)  
Number of Burners  
Vent Connector Diameter (inches)  
Shipping Weight (lbs.)  
4
4
4
4
4
4
4
4
115  
125  
136  
146  
146  
154  
154  
153  
*Off Heating - This fan delay timing is adjustable (90, 120, 150 or 180 seconds). 150 seconds as shipped.  
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.  
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 "MANUAL J-LOAD CALCULATIONS" published by the AIR CONDITIONING CONTRACTORS OF AMERICA. The total  
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.  
12  
 
BLOWER PERFORMANCE SPECIFICATIONS  
(CFM & Temperature Rise vs. External Static Pressure)  
EXTERNAL STATIC PRESSURE (Inches Water Column)  
0.2 0.3 0.4 0.5 0.6 0.7 0.8  
Model  
Tons AC  
at 0.5"  
Motor  
Speed  
0.1  
Heating Speed  
As Shipped  
(
)
ESP CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM  
HIGH  
MED  
3.0  
2.5  
2.0  
1.5  
3.0  
2.5  
2.0  
1.5  
4.0  
3.5  
3.0  
2.5  
3.0  
2.5  
2.0  
1.5  
4.0  
3.5  
3.0  
2.5  
5.0  
4.0  
3.5  
3.0  
5.0  
4.0  
3.5  
3.0  
5.0  
4.0  
3.5  
3.0  
1521 22 1466 23 1414 24 1373 24 1298 26 1243 1164 1075  
1160 29 1160 29 1132 29 1121 30 1082 31 1042 997 925  
*M(H/S)80453A***  
(MEDIUM)  
MED-LO  
LOW  
961  
781  
35  
43  
955  
785  
35  
42  
948  
781  
35  
43  
932  
773  
36  
43  
913  
761  
37  
44  
882 821 803  
745 716 668  
HIGH  
1422 36 1352 38 1307 40 1197 43 1157 45 1092 1075 983  
1098 47 1081 48 1051 49 1039 50 1021 51 983 924 868  
*M(H/S)80703A***  
(MEDIUM)  
MED  
MED-LO  
LOW  
919  
758  
56  
913  
57  
892  
741  
58  
847  
----  
----  
829  
699  
---- 818 792 728  
---- 677 649 626  
---- 741  
----  
---- 733  
HIGH  
2134 ---- 2100 25 2042 25 1975 26 1883 28 1786 1700 1601  
1668 31 1663 31 1656 31 1645 32 1616 32 1549 1492 1391  
1419 37 1426 36 1426 36 1432 36 1419 37 1378 1328 1261  
1134 46 1145 45 1166 44 1171 44 1160 45 1144 1111 1071  
1607 41 1572 42 1547 43 1498 45 1448 46 1390 1302 1222  
1159 58 1156 58 1145 58 1127 59 1108 60 1075 1033 957  
*M(H/S)80704B***  
(MEDIUM)  
MED  
MED-LO  
LOW  
HIGH  
*M(H/S)80903B***  
(MEDIUM)  
MED  
MED-LO  
LOW  
938  
785  
---- 916  
---- 766  
----  
----  
916  
743  
---- 900  
---- 730  
----  
----  
889  
709  
---- 865 829 785  
---- 683 666 604  
HIGH  
2051 ---- 1983 ---- 1895 35 1812 37 1725 39 1627 1530 1439  
1736 38 1708 39 1652 40 1611 41 1540 43 1475 1394 1307  
1493 45 1668 40 1459 46 1429 47 1389 48 1339 1274 1204  
1200 56 1185 56 1180 56 1173 57 1158 58 1125 1125 1080  
2290 ---- 2229 ---- 2155 ---- 2047 ---- 1960 ---- 1837 1712 1584  
1852 36 1820 37 1777 38 1719 39 1641 41 1567 1469 1382  
1615 41 1592 42 1556 43 1516 44 1470 45 1405 1346 1235  
1290 52 1285 52 1265 53 1235 54 1214 55 1174 1044 904  
2323 37 2225 38 2120 40 2040 42 1974 43 1801 1688 1577  
1858 46 1847 46 1799 47 1744 49 1674 51 1577 1493 1399  
1596 53 1587 54 1571 54 1552 55 1493 57 1397 1326 1217  
1291 ---- 1272 ---- 1261 ---- 1257 ---- 1205 ---- 1168 1118 1060  
2469 42 2389 43 2300 45 2223 47 2131 49 2027 1902 1786  
1575 66 1558 67 1545 67 1513 69 1500 69 1419 1354 1271  
1402 ---- 1380 ---- 1343 ---- 1319 ---- 1296 ---- 1245 1183 1106  
1200 ---- 1186 ---- 1161 ---- 1127 ---- 1082 ---- 1042 995 926  
*M(H/S)80904B***  
(MEDIUM)  
MED  
MED-LO  
LOW  
HIGH  
*M(H/S)80905C***  
(MEDIUM)  
MED  
MED-LO  
LOW  
HIGH  
*M(H/S)81155C***  
(MEDIUM)  
MED  
MED-LO  
LOW  
HIGH  
*M(H/S)81405D***  
(MEDIUM)  
MED  
MED-LO  
LOW  
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.  
13  
 
BLOWER PERFORMANCE SPECIFICATIONS  
E I S E U A T P E T E  
14  
 
WIRING DIAGRAMS  
AMH8_CA/CB  
INTEGRATED  
CONTROL MODULE  
HUMIDIFIER  
XFMR (6)  
WARNING:DISCONNECT POWER BEFORE  
SERVICING.WIRING TO UNIT MUST BE  
PROPERLY POLARIZEDAND GROUNDED.  
GND  
GND (8)  
MVC (9)  
24 VAC  
HUMIDIFIER  
C2  
GAS  
HI VALVE  
MVH (12)  
MVL (2)  
M1  
C
ID BLOWER  
PRESSURE  
SWITCH  
C
G
R
W
Y
G
Y
NO  
C
PS (10)  
PSO (4)  
5 MIN  
2 STG MODE  
TO  
MICRO HLI (7)  
WH  
BL  
W
7
4
1
8
5
2
HLO (1)  
6
3
R
RO2 (11)  
RO1 (5)  
AUXILIARY  
LIMITS  
BR  
INTEGRATED  
CONTROL MODULE  
XFMR (3)  
24 VAC  
40 VA  
TRANSFORMER  
BR  
BL  
RD  
XFMR-H  
115 VAC  
XFMR-N  
FLAME SENSOR  
2
1
FP  
HOT SURFACE  
IGNITER  
IGN  
IND  
IGN-N  
IND-N  
PARK  
ID  
BLWR  
BK  
BK  
24V  
CIRCULATOR  
BLWR  
115V  
CIR-N  
XFMR  
WH  
ELECTRONIC  
AIR CLEANER  
BK  
15 PIN PLUG  
ON SOME MODELS  
EAC-H  
LINE-H  
GR  
EAC-N  
LINE-N  
BLOWER COMPARTMENT  
JUNCTION BOX  
BURNER COMPARTMENT  
DOOR  
SWITCH  
24 VAC  
HUMIDIFIER  
DOOR SWITCH  
SWITCH LOCATED IN BLOWER  
COMPARTMENT ON SOME MODELS  
NO  
C
RD  
RD  
DISCONNECT  
PRESSURE  
SWITCH  
YL  
YL  
PRIMARY LIMIT  
YL  
RD  
YL  
WH  
BK  
L
GND  
N
BR  
TO 115VAC/ 1  
Ø /60 HZ POWER SUPPLY WITH  
BL  
OVERCURRENT PROTECTION DEVICE  
WH  
BK  
PM  
1
C
2
HI  
3
JUNCTION  
BOX  
HOT  
SURFACE  
IGNITER  
2 STAGE  
GAS VALVE  
LINE-N  
GND  
LINE H  
PU  
INDUCED DRAFT  
BLOWER  
TO 115 VAC/ 1/60HZ  
POWER SUPPLY WITH  
OVERCURRENT PROTECTION  
DEVICE  
PU  
PU  
FLAME  
SENSOR  
ROLLOUT LIMITS  
(SINGLE CONTROL ON SOME MODELS)  
0
STEADY ON = NORMAL OPERATION  
LOW VOLTAGE (24V)  
EQUIPMENT GND  
FIELD GND  
OFF  
= CONTROL FAILURE  
LOW VOLTAGE FIELD  
HI VOLTAGE (115V)  
HI VOLTAGE FIELD  
JUNCTION  
1
2
3
4
5
6
7
8
C
1 FLASH  
=
SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)  
2 FLASHES = PRESSURE SWITCH STUCK CLOSED  
3 FLASHES = PRESSURE SWITCH STUCK OPEN  
4 FLASHES = OPEN HIGH LIMIT  
FIELD SPLICE  
SWITCH (TEMP.)  
IGNITER  
5 FLASHES = FLAME SENSE WITHOUT GAS VALVE  
TERMINAL  
6 FLASHES =  
OPEN ROLLOUT OR OPEN FUSE  
SWITCH (PRESS.)  
INTERNAL TO  
INTEGRATED CONTROL  
7 FLASHES = LOW FLAME SIGNAL  
OVERCURRENT  
PROT. DEVICE  
8 FLASHES = CHECK IGNITER OR IMPROPER GROUND  
RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND  
PLUG CONNECTION  
NOTES:  
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.  
PK PINK  
COLOR CODES:  
YL YELLOW  
OR ORANGE  
PU PURPLE  
GR GREEN  
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.  
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE  
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE  
BR BROWN  
WH WHITE  
BL BLUE  
GY GRAY  
RD RED  
°C. USE COPPER CONDUCTORS ONLY.  
RATING OF AT LEAST 105  
4. BLOWER SPEEDS SHOULD BE ADJUSTED BY INSTALLER TO MATCH THE INSTALLATION  
REQUIREMENTS SO AS TO PROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THE  
CORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)  
BK BLACK  
5. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.  
6. TO RECALL THE LAST 5 FAULTS, MOST RECENT TO LEAST RECENT, DEPRESS SWITCH  
FOR MORE THAN 2 SECONDS WHILE IN STANDBY(NO THERMOSTAT INPUTS).  
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.  
15  
 
WIRING DIAGRAMS  
AMH8_CC  
INTEGRATED  
HUMIDIFIER  
XFMR(6)  
WARNING:DISCONNECTPOWERBEFORE  
CONTROLMODULE  
SERVICING.WIRINGTOUNITMUSTBE  
PROPERLYPOLARIZEDANDGROUNDED.  
GND  
GND(8)  
MVC(9)  
24VAC  
HUMIDIFIER  
C2  
HI  
GAS  
VALVE  
MVH(12)  
MVL(2)  
M1  
C
IDBLOWER  
PRESSURE  
SWITCH  
AUXILIARY  
LIMITCONTROLS  
C
G
R
W
Y
G
Y
NO  
PS(10)  
PSO(4)  
C
AUTO  
1STG  
150SEC  
5MIN  
2STG  
MODE  
H
T
TO  
100SEC  
O
F
F
MICRO HLI(7)  
D
10 11 12  
L
Y
WH  
W
7
4
1
8
5
2
9
6
3
BL  
HLO(1)  
AUTORESET  
PRIMARY  
LIMIT  
FUSE  
R
RO2(11)  
RO1(5)  
SEENOTE6  
BR  
CONTROL  
AUXILIARY  
LIMITS  
INTEGRATED  
CONTROLMODULE  
MANUALRESETROLLOUT  
LIMITCONTROL(S)  
(SINGLECONTROLONSOMEMODELS)  
XFMR(3)  
FS  
24VAC  
40VA  
TRANSFORMER  
BR  
BL  
RD  
XFMR-H  
XFMR-N  
115VAC  
FLAMESENSOR  
2
1
FP  
HOTSURFACE  
IGNITER  
XFMR-H LINE-H EAC-H  
IGN  
IND  
IGN-N  
PARK  
ID  
BLWR  
BK  
IND-N  
L
H
O
E
A
T
-
BK  
24V  
H
COOL-H  
I
CIRCULATOR  
BLWR  
115V  
CIR-N  
H
E
H
-
XFMR  
T
A
H
WH  
BK  
ELECTRONIC  
AIRCLEANER  
15PINPLUG  
ONSOMEMODELS  
EAC-H  
LINE-H  
GR  
EAC-N  
BLOWERCOMPARTMENT  
LINE-N  
JUNCTIONBOX  
BURNERCOMPARTMENT  
DOOR  
SWITCH  
24VAC  
HUMIDIFIER  
DOORSWITCH  
SWITCHLOCATEDINBLOWER  
COMPARTMENTONSOMEMODELS  
NO  
C
WARNING:  
RD  
RD  
DISCONNECTPOWER  
BEFORESERVICING.  
WIRINGTOUNIT  
MUSTBE  
PROPERLY  
POLARIZED  
DISCONNECT  
PRESSURE  
SWITCH  
YL  
YL  
PRIMARYLIMIT  
YL  
RD  
YL  
WH  
BK  
ANDGROUNDED.  
L
GND  
N
BR  
BL  
OVERCURRENTPROTECTIONDEVICE  
WH  
BK  
PM  
1
C
3
HI  
2
JUNCTION  
BOX  
HOT  
SURFACE  
IGNITER  
2STAGE  
GASVALVE  
(HONEYWELL)  
LINE-N  
GND  
LINEH  
PU  
INDUCEDDRAFT  
BLOWER  
TO115VAC/1/60HZ  
POWERSUPPLYWITH  
OVERCURRENTPROTECTION  
DEVICE  
PU  
PU  
FLAME  
SENSOR  
ROLLOUTLIMITS  
(SINGLECONTROLONSOMEMODELS)  
0
STEADYON=NORMALOPERATION  
LOWVOLTAGE(24V)  
LOWVOLTAGEFIELD  
HIVOLTAGE(115V)  
HIVOLTAGEFIELD  
EQUIPMENTGND  
FIELDGND  
OFF  
=CONTROLFAILURE  
1
2
3
4
5
6
1FLASH  
=
SYSTEMLOCKOUT(RETRIES/RECYCLESEXCEEDED)  
2FLASHES=PRESSURESWITCHSTUCKCLOSED  
3FLASHES=PRESSURESWITCHSTUCKOPEN  
4FLASHES=OPENHIGHLIMIT  
FIELDSPLICE  
SWITCH(TEMP.)  
IGNITER  
JUNCTION  
TERMINAL  
INTERNALTO  
5FLASHES=FLAMESENSEWITHOUTGASVALVE  
6FLASHES=  
OPENROLLOUTOROPENFUSE  
SWITCH(PRESS.)  
7FLASHES=LOWFLAMESIGNAL  
7
8
INTEGRATEDCONTROL  
OVERCURRENT  
PROT.DEVICE  
8FLASHES=CHECKIGNITERORIMPROPERGROUND  
RAPIDFLASHES=REVERSED115VACPOLARITY/VERIFYGND  
PLUGCONNECTION  
C
NOTES:  
1.SETHEATANTICIPATORONROOMTHERMOSTATAT0.7AMPS.  
2.MANUFACTURER'SSPECIFIEDREPLACEMENTPART SMUSTBEUSEDWHENSERVICING.  
3.IFANYOFTHEORIGINALWIREASSUPPLIEDWITHTHEFURNACEMUSTBE  
PKPINK  
COLORCODES:  
YL YELLOW  
OR ORANGE  
PUPURPLE  
GRGREEN  
BRBROWN  
WH WHITE  
BLBLUE  
REPLACED,ITMUSTBEREPLACEDWITHWIRINGMATERIALHAVINGATEMPERATURE  
RATINGOFATLEAST105  
°C.USECOPPERCONDUCTORSONLY.  
4.BLOWERSPEEDSSHOULDBEADJUSTEDBYINSTALLERTOMATCHTHEINSTALLATION  
REQUIREMENTSSOASTOPROVIDETHECORRECTHEATINGTEMPERATURERISEANDTHE  
CORRECTCOOLINGCFM.(SEESPECSHEETFORAIRFLOWCHART)  
GYGRAY  
RD RED  
BKBLACK  
5.UNITMUSTBEPERMANENTLYGROUNDEDANDCONFORMTON.E.C.ANDLOCALCODES.  
6.TORECALLTHELAST5FAULTS,MOSTRECENTTOLEASTRECENT,DEPRESSSWITCH  
FORMORETHAN2SECONDSWHILEINSTANDBY(NOTHERMOSTATINPUTS).  
0140F00662 REV.A  
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.  
16  
 
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.  
ATOR  
CIRCUL  
BLOWER  
ELECTRONIC  
AIR CLEANER  
NDUCER  
I
HI  
HEAT  
LO  
HEAT  
CIR  
NEU  
C
EA  
PARK  
IND  
COOL  
EAC  
NEU  
R
K2 K2  
RO2  
RO1  
ROLLOUT  
SWITCH  
K3  
K6  
K3  
K1  
TH  
K7  
XFMR  
HOT  
24 VAC  
XFMR  
NEU  
.0005  
3M  
COMPRESSOR  
TACTOR  
CON  
FACTORY  
JUMPER  
TR  
C
K5  
R
COIL  
K4  
FACTORY  
JUMPER  
Y
G
W
Y
G
W
GND  
IGN  
PS  
MV MLV  
HLI  
HLO  
FP  
PSO  
THERMOSTAT  
FLAME  
SENSOR  
PROBE  
COM  
PM  
AUX  
LIMIT  
HIGH  
LIMIT  
ITOR  
IGN  
HI  
2-STAGE  
ALVE  
GAS V  
PRESSURE  
SWITCH  
TYPICAL SCHEMATIC  
AMH8 ____** MODEL FURNACES  
WR 50M56-289 INTEGRATED IGNITION CONTROL  
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.  
17  
 

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