Amana Furnace Amh Users Manual

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TECHNICAL MANU
AL
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.

®
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.
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.

US

RT6621017r1
April 2010

®

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.

A

M

PRODUCT
TYPE:
®
A: Amana
Brand

H

8

070

3

A

X
ADDITIONAL
FEATURES:
N: Natural Gas
X: Low NOx

FURNACE TYPE:
TM
H: Twin Comfort
Multi-Speed

A

A
MINOR REVISION:
A: Initial Release

CABINET WIDTH:
A: 14"
C: 21"
B: 17 1/2" D: 24 1/2"

SUPPLY TYPE:
M: Upflow/Horizontal
AFUE:
8: 80%

AIRFLOW
CAPABILITY:
3: 1200
4: 1600
5: 2000

MAJOR REVISION:
A: Initial Release

NOMINAL CAPACITY
045: 45,000 BTUH
070: 70,000 BTUH
090: 90,000 BTUH
115: 115,000 BTUH
140: 140,000 BTUH

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.

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

2

Installation and repair of this unit
should be performed ONLY by
individuals meeting the requirements of an "entry level technician", at a minimum, as
specified by the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). Attempting to install or repair this
unit without such background may result in product
damage, personal injury or death.

WARNING

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

WARNING

The United States Environmental Protection Agency (“EPA”) has issued various regulations regarding 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.

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

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

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.
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.
This furnace is also equipped with a self-diagnosing electronic 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 Contractors of America.
*Obtain from: American National Standards Institute 1430
Broadway New York, NY 10018
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 vehicles.

4

WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
DO NOT VENT USING
CATEGORY III VENTING.

THIS FURNACE MUST BE CATEGORY I VENTED.

1. Category I Venting is venting at a non-positive pressure.
A furnace vented as Category I is considered a fan-assisted 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.
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.
3. Conversion kits for propane gas and high altitude natural
and propane gas operation are available. See High Altitude Derate chart for details.

PRODUCT DESIGN
Accessibility Clearances (Minimum)

High Altitude Derate

Unobstructed front clearance of 24" for servicing is recommended.

When this furnace is installed at high altitude, the appropriate High Altitude orifice kit must be installed. This is required 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
Sides

Rear

Front*

1

0

3

Vent
SW

B

6

1

Top
1

INPUT PER BURNER - 22,500 BTUH NATURAL GAS / 20,000 BTUH L.P.

* 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.

Note: In all cases accessibility clearance shall take precedence over clearances from the enclosure where accessibility clearances are greater. All dimensions are given in
inches.

ELEVATION ABOVE SEA-LEVEL (FEET)
2000

3000

4000

US BURNER
ORIFICE

44/55

44/55

45/56

CANADA BURNER
ORIFICE

44/55

4500

5000

6000

7000

8000

45/56

46/57

47/58

47/58

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.

High altitude kits are purchased according to the installation 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 Natural Gas and Propane Gas kits. For a tabular listing of appropriate 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 Accessory Charts in Service Instructions.

5

COMPONENT IDENTIFICATION

1 Tubular Heat Exchanger
2 Pressure Switch
3 Flue Pipe Connection
4 Induced Draft Blower

躀

5 Gas Line
Entrance
6 Gas Valve
7 Rollout Limit
8 Junction Box
9 Wiring Harness
Grommet
Gas Manifold

Gas Line Entrance
(Alternate)

Inshot Burner

Transformer
Circulator Blower
Blower Door
Interlock Switch
Integrated Control Module

Note: Primary Limit Not Shown

Upflow/Horizontal

6

1

Tubular Heat Exchanger

9 Wiring Harness Grommet

2

Pressure Switch

10 Gas Manifold

3

Flue Pipe Connection

11 Inshot Burner

4

Induced Draft Blower

12 Transformer

5

Gas Line Entrance

13 Integrated Control Module

6

Gas Valve

14 Blower Door Interlock Swtich

7

Rollout Limit

15 Circulator Blower

8

Junction Box

16 Gas Line Entrance (Alternate)

PRODUCT DIMENSIONS
AMH8
Alt. Gas Inlet

Alt. Gas Inlet

Alt. High Voltage

High Voltage Inlet
Low Voltage

Alt. LowVoltage

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.

7

PRODUCT DESIGN
PRESSURE SWITCH TRIP POINTS
AND USAGE CHART

PRESSURE SWITCH TRIP POINTS
AND USAGE CHART

SQUARE NOSE
TRIP POINT
ID BLOWER
PRESSURE
SWITCH

ROUND NOSE
TRIP POINT
ID BLOWER
PRESSURE
SWITCH

MODEL

ID BLOWER
PRESSURE
SWITCH
PART #

MODEL

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

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

AMH80453A*

1

---

---

---

AMH80703A*

---

1

---

---

AMH80704B*

---

1

---

---

AMH80903B*

---

1

---

---

AMH80904B*

---

---

1

---

AMH80905C*

---

---

---

1

AMH81155C*

---

---

---

1

AMH81405D*

---

---

1

---

ROLLOUT LIMIT SWITCHES

8

ID BLOWER
PRESSURE
SWITCH
PART #

AUXILIARY LIMIT SWITCHES

Part Number

10123529

Part Number

0130F00038

Open Setting (°F)

300

Open Setting (°F)

120

AMH80453AX**

2

AMH80453A*

1

AMH80703AX**

2

AMH80703A*

1

AMH80704BX**

2

AMH80704B*

1

AMH80903BX**

2

AMH80903B*

1

AMH80904BX**

2

AMH80904B*

1

AMH80905CX**

2

AMH80905C*

1

AMH81155CX**

2

AMH81155C*

1

AMH81405DX**

2

AMH81405D*

1

PRODUCT DESIGN
Coil Matches:
A large array of Amana® brand coils are available for use with the AMH8 furnaces, in either upflow or horizontal applications. 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

EXPANSION
DEVICE:
F: Flowrater

PRODUCT
TYPE:
C: Indoor Coil

A
REVISION
A: Revision

REFRIGERANT
CHARGE:
6: R-410A or R-22
2: R-22
4: R-410a

CABINET FINISH:
U: Unpainted
P: Painted
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

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

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)
Approx.
Cabinet
Nominal
Width
Filter Size Flow Area
(in.)
(in.)
(in2)
All
16 x 25 x 1
400

Bottom Return
Approx.
Cabinet
Nominal
Width
Filter Size Flow Area
(in.)
(in.)
(in2)
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

Refer to Minimum Filter Area tables to determine filter area requirement. NOTE: Filters can also be installed elsewhere in
the duct system such as a central return.

MINIMUM FILTER SIZES
FURNACE INPUT

FILTER SIZE

TYPE

45M

2

160 in

permanent

70M

241 in2

permanent

90M

2

permanent

2

permanent

2

permanent

2

disposable

2

disposable

2

disposable

2

disposable

2

disposable

115M
140M
45M
70M
90M
115M
140M

320 in
400 in
370 in

320 in
483 in
640 in
800 in
738 in

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 DIP SWITCH

MODE

5 MIN. FIXED
2ND STAGE DELAY
DIPSWITCH
AUTO

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
Blower Switch to
Hi Heat Operation

Gas Valve Switch
to 2nd Stage
Blower Switch to
Hi Heat Operation

T-Stat Satisfied

T-Stat Satisfied

11

AMH80453AX**

AMH80703AX**

AMH80704BX**

AMH80903BX**

AMH80904BX**

AMH80905CX**

AMH81155CX**

AMH81405DX**

FURNACE SPECIFICATIONS

45,000

70,000

70,000

90,000

90,000

90,000

115,000

140,000

36,000

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%

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

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

1/3

1/3

1/2

1/3

1/2

1/2

1/2

3/4

4

4

4

4

4

4

4

4

1280

1100

1610

1439

1738

1854

1902

2084

115/60/1

115/60/1

115/60/1

115/60/1

115/60/1

115/60/1

115/60/1

115/60/1

8.1

8.1

12.5

8.1

12.5

12.5

12.5

14.7

15

15

15

15

15

15

15

15

Transformer (VA)

40

40

40

40

40

40

40

40

Primary Limit Setting (°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

150

150

150

150

150

150

150

150

5

5

5

5

5

5

5

5

Off Cooling

45

45

45

45

45

45

45

45

Fan Delay On - Fan Only

0

0

0

0

0

0

0

0

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

43 / 55

43 / 55

43 / 55

43 / 55

43 / 55

43 / 55

43 / 55

43 / 55

Number of Burners

2

3

3

4

4

4

5

6

Vent Connector Diameter (inches)

4

4

4

4

4

4

4

4

115

125

136

146

146

154

154

153

MODEL

Input, Natural Gas (BTUH)
Output, Natural Gas (BTUH) 1

Rated External Static (" w.c.)
Temperature Rise (°F)

Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply (Volts/Hz/Ph)
Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Device

3

Off Heating *
Fan Delay On Cooling

Gas Supply Pressure
(Natural/Propane) (" w.c.)
Manifold Pressure
(Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)

Shipping W eight (lbs.)

2

*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 HACRtype 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)
Model

(

Heating Speed
As Shipped

)

Motor
Speed

EXTERNAL STATIC PRESSURE (Inches Water Column)

Tons AC
at 0.5"
ESP

0.1

0.2

0.3

0.4

0.6

0.5

0.7

0.8

CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM

HIGH

3.0

1521

22

1466

23

1414

24

1373

24

1298

26

1243 1164 1075

*M(H/S)80453A***

MED

2.5

1160

29

1160

29

1132

29

1121

30

1082

31

1042

997

925

(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

1422

36

1352

38

1307

40

1197

43

1157

45

1092 1075

983

*M(H/S)80703A***

MED

2.5

1098

47

1081

48

1051

49

1039

50

1021

51

983

924

868

(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

----

2100

25

2042

25

1975

26

1883

28

1786 1700 1601

*M(H/S)80704B***

MED

3.5

1668

31

1663

31

1656

31

1645

32

1616

32

1549 1492 1391

(MEDIUM)

MED-LO

3.0

1419

37

1426

36

1426

36

1432

36

1419

37

1378 1328 1261

LOW

2.5

1134

46

1145

45

1166

44

1171

44

1160

45

1144 1111 1071

HIGH

3.0

1607

41

1572

42

1547

43

1498

45

1448

46

1390 1302 1222

*M(H/S)80903B***

MED

2.5

1159

58

1156

58

1145

58

1127

59

1108

60

1075 1033

957

(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

----

1895

35

1812

37

1725

39

1627 1530 1439

*M(H/S)80904B***

MED

3.5

1736

38

1708

39

1652

40

1611

41

1540

43

1475 1394 1307

(MEDIUM)

MED-LO

3.0

1493

45

1668

40

1459

46

1429

47

1389

48

1339 1274 1204

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

1852

36

1820

37

1777

38

1719

39

1641

41

1567 1469 1382

(MEDIUM)

MED-LO

3.5

1615

41

1592

42

1556

43

1516

44

1470

45

1405 1346 1235

LOW

3.0

1290

52

1285

52

1265

53

1235

54

1214

55

1174 1044

904

HIGH

5.0

2323

37

2225

38

2120

40

2040

42

1974

43

1801 1688 1577

*M(H/S)81155C***

MED

4.0

1858

46

1847

46

1799

47

1744

49

1674

51

1577 1493 1399

(MEDIUM)

MED-LO

3.5

1596

53

1587

54

1571

54

1552

55

1493

57

1397 1326 1217

LOW

3.0

1291

----

1272

----

1261

----

1257

----

1205

----

1168 1118 1060

HIGH

5.0

2469

42

2389

43

2300

45

2223

47

2131

49

2027 1902 1786

*M(H/S)81405D***

MED

4.0

1575

66

1558

67

1545

67

1513

69

1500

69

1419 1354 1271

(MEDIUM)

MED-LO

3.5

1402

----

1380

----

1343

----

1319

----

1296

----

1245 1183 1106

LOW

3.0

1200

----

1186

----

1161

----

1127

----

1082

----

1042

995

926

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

14

10

20

30

40

50

60

70

30

80

90

100

40

50

60

700

600 CFM

90

100

2000
2200
2400 CFM

1800

1600

1400

OUTPUT BTU/HR x 1000

80

1200

1100

1000

900

70

800

FORMULAS

110

120

130

140

BTU OUTPUT = CFM x 1.08 x RISE
BTU OUTPUT
RISE =
÷ CFM
1.08

BTU OUTPUT vs TEMPERATURE RISE CHART

150

BLOWER PERFORMANCE SPECIFICATIONS

TEMPERATURE RISE

WIRING DIAGRAMS

AMH8_CA/CB

WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.

INTEGRATED
CONTROL MODULE

HUMIDIFIER
XFMR (6)

GND

GND (8)

24 VAC
HUMIDIFIER

C2

MVC (9)

HI

GAS
VALVE

MVH (12)

G

R

W

Y
5 MIN
2 STG

MODE

WH

7

8

4

5

6

1

2

3

24V THERMOSTAT CONNECTIONS

C

BL

AUXILIARY
LIMITS

BR
INTEGRATED
CONTROL MODULE

M1

MVL (2)

C

ID BLOWER
PRESSURE
SWITCH

G

PS (10)

W
HLO (1)

R
RO2 (11)
RO1 (5)

XFMR (3)

24 VAC

RD

RD

40 VA
TRANSFORMER

BR

BL

NO

C

PSO (4)
TO
MICRO HLI (7)

Y

RD
PU

XFMR-H

115 VAC

XFMR-N

FLAME SENSOR

OR

2

YL

YL

1

FP

BK

BK

24V
BL

IND-N

CIRCULATOR
BLWR

BK
15 PIN PLUG
ON SOME MODELS

GR

ID
BLWR

IND

EAC-H

BLOWER COMPARTMENT

ELECTRONIC
AIR CLEANER

LINE-N
JUNCTION BOX

WH

BK

DOOR
SWITCH

24 VAC
HUMIDIFIER

DOOR SWITCH
SWITCH LOCATED IN BLOWER
COMPARTMENT ON SOME MODELS

NO

EAC-N

LINE-H

BURNER COMPARTMENT

C

OR

RD

CIR-N

CAP

WH

WH

BR
BR

CICULATOR
BLOWER

BR

115V
XFMR

IGN-N
INTEGRATED CONTROL MODULE

PARK

INTEGRATED CONTROL MODULE

BK (HI)
BL (MED)
OR(MED LOW)
RD (LOW)
WH (N)

WH

PU

RD

YL

WH

WH

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.

HOT SURFACE
IGNITER
IGN

PRIMARY LIMIT

PRESSURE
SWITCH

DISCONNECT

YL

RD
YL
YL
WH
BK

L

BL
WH

PM C
1 2

HOT
SURFACE
IGNITER

JUNCTION
BOX

WH

2 STAGE
GAS VALVE

LINE-N
GND
LINE H

PU
INDUCED DRAFT
BLOWER
PU

FLAME
SENSOR

ROLLOUT LIMITS
(SINGLE CONTROL ON SOME MODELS)
0

N

BK

HI
3

PU

GND

TO 115VAC/ 1
Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE

BR

TO 115 VAC/ 1/60HZ
POWER SUPPLY WITH
OVERCURRENT PROTECTION
DEVICE

STEADY ON = NORMAL OPERATION
OFF

LOW VOLTAGE (24V)

= CONTROL FAILURE

1

1 FLASH =

2

2 FLASHES = PRESSURE SWITCH STUCK CLOSED

3

3 FLASHES = PRESSURE SWITCH STUCK OPEN

4

4 FLASHES = OPEN HIGH LIMIT

5

5 FLASHES = FLAME SENSE WITHOUT GAS VALVE

6

6 FLASHES = OPEN ROLLOUT OR OPEN FUSE

SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)

7

7 FLASHES = LOW FLAME SIGNAL
8 FLASHES = CHECK IGNITER OR IMPROPER GROUND

C

RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND

PK PINK
BR BROWN
WH WHITE
BL BLUE
GY GRAY
RD RED

HI VOLTAGE (115V)

EQUIPMENT GND
FIELD GND
FIELD SPLICE

HI VOLTAGE FIELD
SWITCH (TEMP.)

8

COLOR CODES:
YL YELLOW
OR ORANGE
PU PURPLE
GR GREEN
BK BLACK

LOW VOLTAGE FIELD

JUNCTION
TERMINAL
INTERNAL TO
INTEGRATED CONTROL

PLUG CONNECTION

IGNITER
SWITCH (PRESS.)
OVERCURRENT
PROT. DEVICE

NOTES:
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
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
RATING OF AT LEAST 105 °C. USE COPPER CONDUCTORS ONLY.
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)
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

WARNING:DISCONNECTPOWERBEFORE
SERVICING.WIRINGTOUNITMUST BE
PROPERLYPOLARIZEDANDGROUNDED.

INTEGRATED
CONTROLMODULE

HUMIDIFIER
XFMR(6)

GND

GND(8)

24 VAC
HUMIDIFIER

C2

MVC(9)

HI

MVH(12)
MVL(2)

C

GAS
VALVE

M1
IDBLOWER
PRESSURE
SWITCH

AUXILIARY
LIMITCONTROLS
G

R

W

Y
DL
TG
DS
5MIN
2N
2STG
MODE
100SEC HTO
FFD
LY

Y

AUTO
1STG
150SEC
12

7

8

9

4

5

6

1

2

3

WH

BL
DIAGNOSTIC
LED

10 11

FUSE
SEENOTE6

BR

FS

PS(10)

RD

RD

W
HLO(1)
AUTORESET
PRIMARY
LIMIT
CONTROL

R
RO2(11)
RO1(5)

MANUALRESETROLLOUT
LIMITCONTROL(S)
(SINGLECONTROLONSOMEMODELS)
24VAC

XFMR(3)

40VA
TRANSFORMER

COOL-H LO HEAT-H

PU
OR

LINENEUTRAL

YL

YL

1

XFMR-H

XFMR-N

115VAC
FLAMESENSOR

FP
HOTSURFACE
IGNITER

XFMR-H LINE-H EAC-H

24V
BL

ID
BLWR

IND

IND-N
HE LO
AT
-H

COOL-H CIRCULATOR
BLWR
HI -H
AT
HE

BK
15PINPLUG
ONSOMEMODELS

GR

EAC-H

BLOWERCOMPARTMENT

ELECTRONIC
AIRCLEANER

LINE-N
JUNCTIONBOX

BK

WH

NO

C

OR

RD

DOOR
SWITCH

24VAC
HUMIDIFIER

DOORSWITCH
SWITCHLOCATEDINBLOWER
COMPARTMENTONSOMEMODELS

WH

WH

YL
PRIMARYLIMIT

EAC-N

LINE-H

BURNERCOMPARTMENT

RD

CIR-N

CAP

WH

WH

BR
BR

CICULATOR
BLOWER

BR

115V
XFMR

IGN-N
INTEGRATEDCONTROLMODULE

BK

INTEGRATEDCONTROLMODULE

BK(HI)
BL(MED)
OR(MEDLOW)
RD(LOW)
WH(N)

PU

WH

IGN
PARK

BK

NO

C

PSO(4)
TO
MICRO HLI(7)

Y

BR

BL
RD

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.

AUXILIARY
LIMITS

G

HI HEAT-H

INTEGRATED
CONTROLMODULE

2

24VTHERMOSTATCONNECTIONS

C

PRESSURE
SWITCH

YL

RD
YL
YL
WH

WARNING:
DISCONNECTPOWER
BEFORE SERVICING.
WIRINGTOUNIT
MUSTBE
PROPERLY
POLARIZED
AND GROUNDED.

BK

DISCONNECT

L

GND

N

BR
BL

OVERCURRENTPROTECTIONDEVICE
WH

PM C
1
3

HOT
SURFACE
IGNITER

HI
2

BK
JUNCTION
BOX

WH

2STAGE
GASVALVE
(HONEYWELL)

LINE-N
GND
LINEH

PU
INDUCEDDRAFT
BLOWER
PU

PU

FLAME
SENSOR

ROLLOUTLIMITS
(SINGLECONTROLONSOMEMODELS)
0

STEADYON=NORMALOPERATION

1

1FLASH =

2

2FLASHES=PRESSURESWITCHSTUCKCLOSED

OFF

LOW VOLTAGE(24V)

=CONTROLFAILURE
SYSTEMLOCKOUT(RETRIES/RECYCLESEXCEEDED)

3

3FLASHES=PRESSURESWITCHSTUCKOPEN

4

4FLASHES=OPENHIGHLIMIT

5

5FLASHES=FLAMESENSEWITHOUTGASVALVE

6

6FLASHES=

OPENROLLOUTOROPENFUSE

7FLASHES=LOWFLAMESIGNAL

8

8FLASHES=CHECKIGNITERORIMPROPERGROUND

C

RAPIDFLASHES=REVERSED115VACPOLARITY/VERIFYGND

PKPINK
BRBROWN
WH WHITE
BLBLUE
GYGRAY
RD RED

0140F00662 REV.A

EQUIPMENTGND

LOW VOLTAGE FIELD
HIVOLTAGE(115V)

FIELDGND
FIELDSPLICE

HIVOLTAGE FIELD
SWITCH(TEMP.)

7

COLORCODES:
YL YELLOW
OR ORANGE
PUPURPLE
GRGREEN
BKBLACK

TO115VAC/1/60HZ
POWERSUPPLYWITH
OVERCURRENTPROTECTION
DEVICE

JUNCTION
IGNITER

TERMINAL
INTERNALTO
INTEGRATEDCONTROL
PLUGCONNECTION

SWITCH(PRESS.)
OVERCURRENT
PROT.DEVICE

NOTES:
1.SETHEATANTICIPATOR ONROOMTHERMOSTATAT0.7AMPS.
2.MANUFACTURER'SSPECIFIEDREPLACEMENTPARTSMUSTBE USEDWHENSERVICING.
3.IFANYOFTHE ORIGINALWIREAS SUPPLIEDWITHTHE FURNACEMUSTBE
REPLACED,ITMUSTBE REPLACEDWITHWIRINGMATERIALHAVINGATEMPERATURE
RATINGOFATLEAST105
°C.USE COPPERCONDUCTORSONLY.
4.BLOWERSPEEDS SHOULDBEADJUSTEDBYINSTALLERTOMATCHTHEINSTALLATION
REQUIREMENTS SOAS TO PROVIDETHE CORRECTHEATINGTEMPERATURE RISEANDTHE
CORRECTCOOLINGCFM.(SEESPECSHEETFORAIRFLOWCHART)
5.UNITMUSTBE PERMANENTLY GROUNDEDANDCONFORMTON.E.C.ANDLOCALCODES.
6.TO RECALLTHE LAST5FAULTS,MOSTRECENTTOLEASTRECENT,DEPRESSSWITCH
FOR MORE THAN2SECONDSWHILE INSTANDBY(NO THERMOSTATINPUTS).

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.

CIRCULATOR
BLOWER

HI
COOL HEAT
K2

ELECTRONIC
AIR CLEANER

LO
HEAT

CIR
PARK NEU EAC

INDUCER

EAC
NEU

IND
R

K2
K3

RO2
RO1

K6

K3

ROLLOUT
SWITCH

TH
K7

K1

XFMR
HOT
24 VAC

.0005
FACTORY
JUMPER

3M
K4

K5
FACTORY
JUMPER

FP

IGN

GND

MV

FLAME
SENSOR
PROBE

MLV

PS

HLO

HLI

PSO

XFMR
NEU
TR
C

COMPRESSOR
CONTACTOR
COIL

Y
G
W

Y
G
W

R

THERMOSTAT

COM
IGNITOR

HI

PM

2-STAGE
GAS VALVE

HIGH
LIMIT

AUX
LIMIT

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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