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.
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.
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.
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.
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.
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 Con
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.
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.
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.
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.
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.
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.
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.
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.
WIRING DIAGRAMS AMH8_CA/CB WARNING:DISCONNECT POWER BEFORE SERVICING.WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED.
WIRING DIAGRAMS AMH8_CC WARNING:DISCONNECTPOWERBEFORE SERVICING.WIRINGTOUNITMUST BE PROPERLYPOLARIZEDANDGROUNDED.
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 .