TECHNICAL MANU AL MANUAL GMS8 33-3/8" 80% Gas Furnace Units 80% AFUE, Single Stage, Multi-Speed, Upflow Horizontal • Refer to Service Manual RS6612006for 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. GMS80403A*A* GMS80603A*A* GMS80604B*A* GMS80804B*A* GMS80805C*A* GMS81005C*A* GMS81205D*A GMS80403A*B* GMS80603A*B* GMS80604B*B* GMS80804B*B* GMS80805C*B* GMS81005C*B* GMS81205D*B* *These models available in Natural Gas and Low NOx.
PRODUCT DESIGN General Operation The GMS8 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 inner blower door is not in place. Keep the blower access door in place except for inspection and maintenance. (See illustration on pages 5 and 6.) This furnace is also equipped with a self-diagnosing electronic control module.
COMPONENT IDENTIFICATION 1 Tubular Heat Exchanger 2 Pressure Switch 3 Flue Pipe Connection 4 Induced Draft Blower ? 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 Note: Primary Limit Not Shown Integrated Control Module Upflow/Horizontal 1 Tubular Heat Exchanger 9 Wiring Harness Grommet 2 Pressure Switch 10 Gas Manifold 3 Flue Pipe Connecti
PRODUCT DIMENSIONS GMS8 Alt. Gas Inlet Alt. Gas Inlet Alt. High Voltage High Voltage Inlet Low Voltage Alt.
PRODUCT DESIGN GMS8***A* Pressure Switch Trip Points Model Trip Point ID B lower Pressure Switch ID B lower Pressure Switch Part # GMS80403A*A* -0.70 B1370158 GMS80603A*A* -0.70 B1370158 GMS80604B*A* -0.75 B1370179 GMS80804B*A* -0.75 B1370179 GMS80805C*A* -0.75 B1370179 GMS81005C*A* -0.90 0130F00041 GMS81205D*A* -0.80 0130F00042 For installations in Canada, the GMS furnaces are certifed only to 4,500 ft. * Negative pressure readings are in inches of water column (*w.c.
PRODUCT DIMENSIONS GMS8***B* Pressure Switch Trip Points Model Trip Point ID Blower Pressure Switch ID Blower Pressure Switch Part # GMS80403A*B* -0.80 0130F00042 GMS80603A*B* -0.80 0130F00042 GMS80604B*B* -0.90 0130F00041 GMS80804B*B* -0.80 0130F00042 GMS80805C*B* -0.80 0130F00042 GMS81005C*B* -0.80 0130F00042 GMS81205D*B* -0.80 0130F00042 For installations in Canada, the GMS furnaces are certifed only to 4,500 ft. * Negative pressure readings are in inches of water column (*w.c.
PRODUCT DESIGN Coil Matches: A large array of Amana® brand coils are available for use with the GMS8 furnaces, in either upflow or horizontal applications. These coils are available in both cased and uncased models (with the option of field installed TXV expansion device). These 80% furnaces match up with the existing Amana® brand coils as shown below.
PRODUCT DESIGN Thermostats: It is recommended that a single-stage heat, non-power robbing thermostat be used. Refer to the product marketing literature for a complete list of thermostats offered. 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 Cabinet Width (in.) All SIDE RETURN Approx.
FURNACE SPECIFICATIONS GMS80403A*A* GMS80603A*A* GMS80604B*A* GMS80804B*A* GMS80805C*A* GMS81005C*A* GMS81205D*A* GMS8***A* Btuh Input (US) High Fire 45,000 70,000 70,000 90,000 90,000 115,000 140,000 Output (US) High Fire 36,000 56,000 56,000 72,000 72,000 92,000 112,000 80% 80% 80% 80% 80% 80% 80% Rated External Static (" w.c.) .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .
FURNACE SPECIFICATIONS GMS80403A*B* GMS80603A*B* GMS80604B*B* GMS80804B*B* GMS80805C*B* GMS81005C*B* GMS81205D*B* GMS8***B* Btuh Input (US) High Fire 40,000 60,000 60,000 80,000 80,000 100,000 120,000 Output (US) High Fire 32,000 48,000 48,000 64,000 64,000 80,000 96,000 80% 80% 80% 80% 80% 80% 80% Rated External Static (" w.c.) .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .
BLOWER PERFORMANCE SPECIFICATIONS GMS8***A* (CFM & Temperature Rise vs. External Static Pressure) Heating Speed As Shipped EXTERNAL STATIC PRESSURE (Inches Water Column) Tons AC Model Motor Speed 0.1 at 0.5" 0.2 0.3 0.4 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 1521 22 1466 23 1414 24 1373 24 1298 26 1243 1164 1075 *MS80403A*A* MED 2.5 1160 29 1160 29 1132 29 1121 30 1082 31 1042 997 925 (MEDIUM) MED-LO 2.
BLOWER PERFORMANCE SPECIFICATIONS GMS8***B* (CFM & Temperature Rise vs. External Static Pressure) Heating Speed As Shipped EXTERNAL STATIC PRESSURE (Inches Water Column) Tons AC Model Motor Speed 0.1 at 0.5" 0.2 0.3 0.4 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 1521 ---- 1466 ---- 1414 ---- 1373 ---- 1298 ---- 1243 1164 1075 *MS80403A*B* MED 2.
TEMPERATURE RISE 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.
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. WIRING DIAGRAMS 16 GMS8 BOX Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.
SCHEMATICS GMS8 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 INDUCER CIR PARK PARK NEU HEAT COOL IND R K2 RO2 RO1 TH K3 K1 ROLLOUT SWITCH XFMR HOT 24 VAC .
