TECHNICAL MANU AL MANUAL GCH9 40" 95% Gas Furnace • 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. GCH90453BXA* GCH90703BXA* GCH90704CXA* GCH90904CXA* GCH90905DXA* GCH91155DXA* These models are Low NOx. WARNING The United States Environmental Protection Agency (“EPA”) has issued various regulations regarding the introduction and disposal of refrigerants introduced into this unit.
PRODUCT DESIGN General Operation The GCH9 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.
COMPONENT IDENTIFICATION 5 26 10 27 31 11 24 28 25 3 15 23 14 3 29 30 31 16 17 18 20 19 18 19 20 13 12 2 21 9 7 8 7 6 4 1 Downflow /Horizontal 1 Two-Stage Gas Valve 19 Coil Front Cover Drain Port 2 Gas Line Entrance (Alternate) 20 Drain Line Penetrations 3 Pressure Switch(es) 21 Drain Trap 4 Gas Manifold 22 Blower Door Interlock Switch 5 Combustion Air Intake Connection 23 Capicitor 6 Hot Surface Igniter 24 Integrated Control Module 7 Rollout Limit 8 Burners 25 2
COMPONENT IDENTIFICATION GCH9*****XA* FRONTVIEW LEFT SIDE VIEW 28 3/4 3/4 RIGHT SIDE VIEW A 2 1/2 AIR INTAKE PIPE 2" PVC 20 1/4 3/4 3/4 B (RETURN) CONDENSATE DRAIN TRAP w/ 3/4" PVC DISCHARGE (RIGHT OR LEFT SIDE) 1 3/4 LOW VOLTAGE ELECTRICAL HOLE VENT/FLUE PIPE 2" PVC 2 1/16 40 HIGH VOLTAGE ELECTRICAL HOLE ALTERNATE VENT/FLUE LOCATION 6 1/8 28 5/16 28 5/16 LOW VOLTAGE ELECTRICAL HOLE 1 3/4 HIGH VOLTAGE ELECTRICAL HOLE ALTERNATE AIR INTAKE LOCATION 2 11/16 19 7/8 LEFT SIDE DRAIN LINE HO
PRODUCT DESIGN PRESSURE SWITCH TRIP POINTS AND USAGE CHART 0 to 7,000 ft. TRIP POINT ID BLOWER PRESSURE SWITCH ID BLOWER PRESSURE SWITCH PART # 20197311 -.60 20197311 -.60 20197311 -.60 20197311 GCH90704CX -.37 20197313 -.37 20197313 GCH90904CX -.60 20197311 -.60 20197311 GCH90905CX -.37 20197313 -.37 20197313 GCH91155DX -.60 20197311 -.60 20197311 MODEL TRIP POINT COIL COVER PRESSURE SWITCH GCH90453BX -.
PRODUCT DESIGN ROLLOUT LIMIT SWITCHES Part Number 10123517 10123534 Open Setting (°F) 210 220 GCH90453BX 1 GCH90703BX 2 GCH90704CX 2 GCH90904CX 2 GCH90905DX 2 GCH91155DX 2 AUXILIARY LIMIT SWITCHES Part Number 10123518 10123519 Open Setting (°F) 170 160 GCH90453BX 2 GCH90703BX 2 GCH90704CX 2 2 GCH90904CX GCH90905DX GCH91155DX 8 2 2
PRODUCT DESIGN Coil Matches: A large array of Amana® brand coils are available for use with the GCH9 furnaces, in either counterflow or horizontal applications. These coils are available in both cased and uncased models (with the option of a field installed TXV expansion device). These 90%+ furnaces match up with the existing Amana® brand coils as shown in the chart below.
PRODUCT DESIGN Thermostats: NOTE: Complete lineup of thermostats can be found in the Thermostat Specification Sheets. 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 This furnace has provisions for the installation of return air filters at the side and/or bottom return.
PRODUCT DESIGN Dual $aver Configuration & Operation Dual $aver This furnace is capable fo 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 Mode ON Mode Dipswitch 5 Min. Fixed 2nd Stage Delay Dipswitch Auto Note: This furnace is designed to be used with a single-stage room thermosat.
FURNACE SPECIFICATIONS MODEL Btuh Input (US) GCH9 GCH90453BX GCH90703BX GCH90704BX GCH90904CX GCH90905CX GCH91155DX 46,000 69,000 69,000 92,000 92,000 115,000 Output (US) 42,800 64,400 64,400 86,000 86,000 106,500 BTUH Output (US) LP 38,502 57,753 57,753 77,004 77,004 96,255 93 93 93 93 93 93 A.F.U.E. Rated External Static (" w.c.) .20" - .50" .20" - .50" .20" - .50" .20" - .50" .20" - .50" .20" - .
BLOWER PERFORMANCE SPECIFICATIONS BLOWER PERFORMANCE (CFM & Temperature Rise vs. External Static Pressure) ( 1. EXTERNAL STATIC PRESSURE (Inches Water Column) Tons AC Model ) Heating Speed As Shipped Motor Speed at 0.5" ESP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM HIGH 3.0 1352 29 1318 30 1260 31 1202 33 1128 35 1044 955 853 GCH90453BXA* MED 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 GCH9*****X[AA,AB] BLOWER COMPARTMENT DOOR SWITCH (OPEN WHEN DOOR OPEN) OR 24 VAC HUMIDIFIER GY 24 VAC INTEGRATED CONTROL MODULE HUMIDIFIER TR (6) GND GND (8) C GAS HI VALVE MVC (9) 115 VAC 24V THERMOSTAT CONNECTIONS PM G C MVH (12) R BK FUSE GY 3 5 4 8 7 BL 12 11 10 YL 2ND STAGE DELAY MODE * FACTORY SETTINGS 2 WH R RO2 (11) RO1 (5) 24 VAC 115 VAC FLAME SENSOR WH FS HOT SURFACE IGNITER HEAT-H IGN BK OR GY OR BL BK BR BR GR RD PK RD YL BK (HI)
WIRING DIAGRAMS GCH9*****XAC BLOWER COMPARTMENT DOORSWITCH (OPENWHEN DOOROPEN) OR 24VAC HUMIDIFIER GY 24 VAC C R MVH(12) MVL(2) BK GY INTEGRATED CONTROL MODULE 2 1 6 5 4 9 8 7 BL 12 11 10 YL OFF MODE HEAT OFF DELAY * * FACTORYSETTINGS SHOWN MANUALRESETROLLOUT LIMITCONTROL(S) (SINGLECONTROLON45KBTU) 24VAC XFMR-H WH FS HOTSURFACE IGNITER IGN BK OR BR CAPACITOR PU HE LO AT -H COOL-H CIRCULATOR BLWR HI H AT HE OR WH YL OR BL CIRCULATOR BLOWER RD YL BK ID BLWR I