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Amana GUCA045AX30 Service Instructions Manual

40" 90% condensing gas furnaces guca, gcca & accessories
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Service
Instructions
40" 90% Condensing Gas Furnaces
GUCA, GCCA & Accessories
This manual is to be used by qualified HVAC
technicians only. Amana does not assume
any responsibility for property damage or
personal injury for improper service proce-
dures done by an unqualified person.
Heating
Air Conditioning
®
Model and Manufacturing
numbers listed on page 4.
RS6610002
Revision 0
October 1998

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Summary of Contents for Amana GUCA045AX30

  • Page 1: Service Instructions

    40" 90% Condensing Gas Furnaces GUCA, GCCA & Accessories This manual is to be used by qualified HVAC technicians only. Amana does not assume any responsibility for property damage or personal injury for improper service proce- dures done by an unqualified person.

  • Page 2: Table Of Contents

    INDEX Important Safety Information ................. 3 Product Identification ..................... 4-13 Furnace Specifications ..................14-15 Blower Performance Specifications ............... 16-18 Combustion and Ventilation Air ................19-28 Condensate Drain Lines and Drain Trap ............... 29-32 Product Design ...................... 33-46 System Operation ....................47-51 Polarization and Phasing ..................

  • Page 3: Important Safety Information

    DANGEROUS CONDITIONS (SUCH AS EXPOSURE TO ELEC- WARNING TRICAL SHOCK) MAY RESULT. THIS MAY CAUSE SERIOUS IN- JURY OR DEATH. AMANA WILL NOT BE RESPONSIBLE FOR ANY INJURY OR CAUTION PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES. IF YOU PERFORM SERVICE ON YOUR OWN PRODUCT, YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROP- ERTY DAMAGE WHICH MAY RESULT.

  • Page 4: Product Identification

    It is very important to use the model and manufacturing numbers at all times when requesting service or parts information. MODEL MODEL GUCA045AX30 P1219301F GUCA045AX30 P1227501F GUCA070AX30 P1219302F GUCA070AX30 P1227502F GUCA070AX40 P1219303F...
  • Page 5 PRODUCT IDENTIFICATION A 045 A X 30 Product Type Airflow Capability G: Gas Furnace 30: 3.0 Tons 35: 3.5 Tons 40: 4.0 Tons Supply Type 50: 5.0 Tons C: Counterflow/Horizontal U: Upflow/Horizontal Additional Features A: Not NOx Certified X: NOx Models Furnace Type C: Condensing (90%) Design Series...
  • Page 6 PRODUCT IDENTIFICATION Rev. 0...
  • Page 7 3. Conversion kits for high altitude natural gas op- eration are available. Contact your Amana dis- tributor or dealer for details. Rev. 0...
  • Page 8 3. Conversion kits for high altitude natural gas op- eration are available. Contact your Amana dis- tributor or dealer for details. Rev. 0...

  • Page 9: Component Identification

    PRODUCT IDENTIFICATION 9 10 14 15 Upflow/Horizontal (GUCA Models) Counterflow/Horizontal (GCCA Models) 1 Gas Valve 17 Induced Draft Blower 2 Gas Line Entrance (Alternate) 18 Coil Front Cover Pressure Tap 3 Pressure Switch 19 Coil Front Cover Drain Port 4 Gas Manifold 20 Drain Line Penetrations 5 Combustion Air Intake Connection / “Coupling”...
  • Page 10 PRODUCT IDENTIFICATION A large array of Amana coils are available for use with the new GUCA and GCCA furnaces, in either upflow, counterflow, or horizontal applications. These coils are available in both cased and uncased models, with or without a TXV expansion device.
  • Page 11 PRODUCT IDENTIFICATION ACCESSORIES Furnace Floor Base Gasket Floor 2" 1" Min. Plenum Plenum Duct 3/4" 4-7/16" 3/4" 3/4" Side View Front View Floor Base Used On Floor Opening Plenum Size Part Numbers Models GCCA045__30 CFB16 16-1/2 23-3/4 18-9/16 GCCA070__30 GCCA070__40 CFB20 20-1/2 23-3/4...

  • Page 12: Electronic Air Cleaner

    PRODUCT IDENTIFICATION ACCESSORIES MAC1 SPECIFICATIONS CAPACITY 600-2000CFM 12 MO.NOMINAL MEDIA SERVICE LIFE MEDIA LISTING UL CLASS 2 DIMENSIONS 7-1/4 22-1/8 22-5/8 17-11/16 RESISTANCE INCHES W.C. 1000 1200 1400 1600 1800 2000 All dimensions are in inches. MEDIA AIR CLEANER Used On Models GUCA GUCA MEDIA AIR CLEANER...

  • Page 13: Product Identification

    Must Be Adequately Secured and Supported Concentric Vents Kits HVCK and VCVK Sanitary Tee are suitable for use with the following Amana 90% efficient furnace products: CONCENTRIC VENT KIT Connection for Used On Models Fresh Air Intake Pipe to Furnace...

  • Page 14: Furnace Specifications

    FURNACE SPECIFICATIONS MODEL GUCA045AX30 GUCA070AX30 GUCA070AX40 GUCA090AX40 GUCA090AX50 GUCA115AX50 Btuh Input (US) 46,000 69,000 69,000 92,000 92,000 115,000 Output (US) 42,800 64,400 64,400 86,000 85,300 106,500 Input (CAN) 46,000 69,000 69,000 92,000 90,000 115,000 Output (CAN) 42,800 64,400 64,400 86,000...
  • Page 15 FURNACE SPECIFICATIONS MODEL GCCA045AX30 GCCA070AX30 GCCA070AX40 GCCA090AX40 GCCA090AX50 GCCA115AX50 Btuh Input (US) 46,000 69,000 69,000 92,000 92,000 115,000 Output (US) 43,000 65,400 63,300 87,500 86,200 109,100 Input (CAN) 46,000 69,000 69,000 92,000 92,000 115,000 Output (CAN) 43,000 65,400 63,300 87,500 86,200 109,100 A.F.U.E.

  • Page 16: Blower Performance Specifications

    Heating Speed at 0.5" Speed As Shipped CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM HIGH 1322 1298 1278 1243 1196 1137 1074 1000 GUCA045AX30 1131 1114 1097 1068 1019 (MED-LO) MED-LO HIGH 1590 1550 1505 1454...
  • Page 17 BLOWER PERFORMANCE SPECIFICATIONS GUCA Blower Performance External Static Pressure (Inches Water Column) Tons AC Model Motor Heating Speed at 0.5" Speed As Shipped CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM HIGH 1327 ----- 1342 ----- 1305 ----- 1251 -----...
  • Page 18 BLOWER PERFORMANCE SPECIFICATIONS Rev. 0...

  • Page 19: Combustion And Ventilation Air

    COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) (c) In addition to air needed for combustion, process air WARNING shall be provided as required for: cooling of equipment or material, controlling dew point, heating, drying, oxidation Property damage, bodily injury, or death may occur if or dilution, safety exhaust, odor control, and air for com- the furnace and any other fuel-burning appliances are pressors.
  • Page 20 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) 2. When communicating with the outdoors through verti- cal ducts, each opening shall have a minimum free area of 1 square inch per 4,000 BTU per hour of total input rating of all equipment in the enclosure. The following drawing illustrates the air opening specifications for equipment located in confined spaces;...
  • Page 21 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) 4. When ducts are used, they shall be of the same cross- This furnace must not be connected to Type B, BW, or L sectional area as the free area of the openings to which vent or vent connector, and must not be vented into any they connect.
  • Page 22 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) All 90° elbows must be medium radius (1/4 bend DWV) or • The vent termination of a direct vent application must long radius (Long sweep 1/4 bend DWV) types conform- terminate at least 12 inches from any opening through ing to ASTM D3311.
  • Page 23 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) • Less than 36 inches from any building opening or Non-Direct Vent Installations any gas service regulator. For gas service regulators A minimum of one 90° elbow must be installed on the com- in the Province of Ontario, 72 inches.
  • Page 24 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) 2. Upflow and Counterflow units . WARNING Loosen the worm gear hose clamps on the rubber el- bow and detach it from both the induced draft blower The rubber elbow is not designed to support a load. and the vent/flue pipe.
  • Page 25 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) Alternate Combustion Air Intake Location 6. Upflow and Counterflow units. The alternate combustion air intake location is the large For direct vent installations , secure field-supplied hole not in line with the induced draft blower outlet. To use combustion air intake pipe directly to the air intake cou- the alternate combustion air intake location, refer to the pling.
  • Page 26 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) bustion air intake to prevent inadvertent blockage. The tee Horizontal vent/flue pipe terminations should be as shown in the following figure. Refer to Vent/Flue Pipe and Com- used in the vent/flue termination must be included when determining the number of elbows in the piping system.
  • Page 27 COMBUSTION AND VENTILATION AIR (DIRECT/NON-DIRECT VENT MODELS) Direct Vent (Dual Pipe) Piping Vertical pipe terminations should be as shown in the fol- lowing figure. Refer to Vent/Flue Pipe and Combustion Pipe Direct vent installations require both a combustion air in- - Termination Locations section for details concerning lo- take and a vent/flue pipe.

  • Page 28: Combustion And Ventilation Air

    90° SCREEN MEDIUM cal). RADIUS ELBOWS Concentric Vent Kits HVCK and VCVK are suitable for use with the following Amana 90% efficient furnace product: CONCENTRIC VENT KIT Description Horizontal Terminations Used On Models GUCA 40" Tall 90% Upflow/Horizontal Furnace Above Anticipated Snow Level (Dual Pipe) 40"...

  • Page 29: Condensate Drain Lines And Drain Trap

    CONDENSATE DRAIN LINES AND DRAIN TRAP Condensate Drain Lines and Drain Trap Upright Installations In an upright installation drain hoses are connected to drain General ports on the rubber elbow and the recuperator coil front A condensing gas furnace achieves its high level of effi- cover.

  • Page 30: Condensate Drain Lines

    CONDENSATE DRAIN LINES AND DRAIN TRAP Model "X" Length to Cut From RIGHT SIDE Cabinet Width GUCA & GCCA Long End of Hose B PANEL (inches) (kBTU Tons) (inches) RUBBER ELBOW 045__30 16.5 8 inches RUBBER ELBOW 070__30 DRAIN PORT 070__40 4 inches 20.5...
  • Page 31 CONDENSATE DRAIN LINES AND DRAIN TRAP 6. Cut 17 7/8 inches from the long end of Hose B and discard. 7. Secure remaining end of Hose B to exposed end of FRONT COVER DRAIN PORT Tube 1 with a hose clamp. Route hose toward right side HOSE A panel grommet holes.

  • Page 32: Condensate Drain Lines And Drain Trap

    CONDENSATE DRAIN LINES AND DRAIN TRAP 2. Upflow furnaces 5. Secure short end of Hose B to induced draft blower drain port using a hose clamp. Route hose to front left Relocate the front cover pressure switch hose connec- (down) side panel grommet holes. tion from the right side (as shipped) pressure tap to the left (down) side tap.

  • Page 33: Product Design

    PRODUCT DESIGN Safety 3. Service integrated control module or connecting wiring following the discharge process in step 2. Use caution Please adhere to the following warnings and cautions when not to recharge your body with static electricity; (i.e., do installing, adjusting, altering, servicing, or operating the fur- not move or shuffle your feet, do not touch ungrounded nace.
  • Page 34 PRODUCT DESIGN and Combustion Air Pipe -Termination Locations A copy of the National Fuel Gas Code (NFPA 54/ANSI section to determine if the piping system from fur- Z223.1) can be obtained from any of the following: nace to termination can be accomplished within the American National Standards Institute guidelines given.
  • Page 35 PRODUCT DESIGN closed non-direct vent furnace has an adequate sup- Furnace Suspension ply of combustion air, vent from a nearby uncontami- If suspending the furnace from rafters or joist, use 3/8" nated room or from outdoors. Refer to the Combus- threaded rod and 2”x2”x1/8”...
  • Page 36 PRODUCT DESIGN • Drafts, or dead spots behind doors, in corners, or Existing Furnace Removal under cabinets. Note: When an existing furnace is removed from a venting system serving other appliances, the venting system may • Hot or cold air from registers. be too large to properly vent the remaining attached appli- •...
  • Page 37 PRODUCT DESIGN Alternate Vent/Flue and Combustion Air Connections Freeze Protection In horizontal installations provisions for alternate flue and Refer to Horizontal Applications and Conditions - Drain Trap combustion air piping are available for upflow furnaces with and Lines section for details. left discharge and counterflow furnaces with right air dis- charge.
  • Page 38 PRODUCT DESIGN 4. Verify that wires will not interfere with circulator blower Use a separate fused branch electrical circuit containing operation, filter removal, or routine maintenance. properly sized wire, and fuse or circuit breaker. The fuse or 5. Reinstall blower compartment door. circuit breaker must be sized in accordance with the maxi- mum overcurrent protection specified on the unit rating plate.
  • Page 39 120 VAC EAC-N section located in the SERVICING section of this manual HOT AND PARK or an Amana distributor for a tabular listing of appropriate TERMINALS altitude ranges and corresponding manufacturer’s high al- INTEGRATED 120 VAC titude (Natural, propane gas, and/or Pressure Switch) kits.

  • Page 40: Gas Piping Connections

    PRODUCT DESIGN GAS VALVE MANUAL ALTERNATE SHUT OFF VALVE MANUAL MANIFOLD BURNERS GAS LINE (UPSTREAM FROM SHUT OFF VALVE LOCATION GROUND JOINT (UPSTREAM FROM PIPE UNION) ALTERNATE GROUND JOINT GAS LINE PIPE UNION) LOCATION PLUG IN PLUG IN HEIGHT REQUIRED ALTERNATE ALTERNATE BY LOCAL CODE...
  • Page 41 Pipe in Feet 1/2" 3/4" 1" 1 1/4" 1 1/2" cated in the SERVICING section of this manual or an Amana 1050 1600 distributor for a tabular listing of appropriate altitude ranges 1100 and corresponding manufacturer’s pressure switch kits. Propane Gas Conversion...
  • Page 42 PRODUCT DESIGN • Use listed gas appliance connectors in accordance Note: Never exceed specified pressures for testing. Higher with their instructions. Connectors must be fully in pressure may damage the gas valve and cause subsequent the same room as the furnace overfiring, resulting in heat exchanger failure.
  • Page 43 PRODUCT DESIGN Refer to the following illustration for typical propane gas A duct system must be installed in accordance with Stan- installations. dards of the National Board of Fire Underwriters for the Installation of Air Conditioning, Warm Air Heating and Ven- tilating Systems.
  • Page 44 PRODUCT DESIGN To ensure proper unit performance follow the filter sizes SUPPLY AIRFLOW given in the following filter sizing charts. CENTRAL RETURN GRILLE Side Return Filters Minimum Recommended Size For Maximum CFM Disposable* Permanent* EXTERNAL Model Max CFM Nom. Area Nom.
  • Page 45 PRODUCT DESIGN Heat Anticipator Setting Furnace Shutdown The heat anticipator in the room thermostat must be cor- 1. Set the thermostat to the lowest setting. rectly adjusted to obtain the proper number of cycles per The integrated ignition control will close the gas valve hour and to prevent “overshooting”...

  • Page 46: Product Design

    PRODUCT DESIGN Circula tor Blow e r Spe e ds Jumper DIP Switches Spe e d W ire Color Second Delay Medium Low Orange Medium Blue High Black Second Common/Neutral W hite Delay Blower Heat Off Delay Timings The integrated control module provides a selectable heat Second Delay off delay function.

  • Page 47: System Operation

    SYSTEM OPERATION Normal Sequence of Operation Cooling Mode The normal operational sequence in cooling mode is as Power Up follows: The normal power up sequence is as follows: • R and Y thermostat contacts close, initiating a call for cool. •...
  • Page 48 SYSTEM OPERATION TIMING CHART FOR NORMAL HEATING OPERATION CIRCULATOR BLOWER OPEN GAS VALVE CLOSED IGNITER OPEN PRESSURE SWITCH CLOSED CONTACTS INDUCED DRAFT BLOWER THERMOSTAT 60,90, SECONDS circ 120 or FIXED HEAT IGNITER WARM UP PERIOD ON DELAY: (see note) 30 SECONDS NOTE: HEATCRAFT INTEGRATED CONTROL MODULE HAS A FIXED STANDARD SEVEN-SECOND IGNITER WARM UP PERIOD (MINI IGNITER).
  • Page 49 SYSTEM OPERATION Troubleshooting Diagnostic Chart WARNING Electrostatic Discharge (ESD) Precautions Note: Discharge body’s static electricity before touching To avoid electrical shock, injury or death, disconnect unit. An electrostatic discharge can adversely affect elec- electrical power before performing any service or main- trical components.

  • Page 50: Troubleshooting Chart

    TROUBLESHOOTING CHART Associated Symptoms of Abnormal Cautions and LED Code Fault Description(s) Possible Causes Corrective Action Operation Notes (See Note 2) - No 115 V power to furnace, or no 24 V - Manual disconnect switch OFF, door switch open, - Assure 115 V and 24 V power to furnace and integrated - Furnace fails to operate.
  • Page 51 TROUBLESHOOTING CHART Associated Cautions and Symptoms of Abnormal LED Code Fault Description(s) Possible Causes Corrective Action Operation Notes (See Note 2) - Turn power OFF prior to repair. - Flame sensor is coated/oxidized. - Sand flame sensor if coated/oxidized. Inspect for proper sensor alignment. - Normal furnace operation.

  • Page 52: Polarization And Phasing

    POLARIZATION AND PHASING As more and more electronic's are introduced to the Heat- Incoming Power ing Trade, Polarization of incoming power and phasing Meter Reads Meter Reads 120 Volts 0 Volts of primary to secondary voltage on transformers becomes more important. Polarization has been apparent in the Appliance industry Volt / Ohm Volt / Ohm...

  • Page 53: Scheduled Maintenance

    MAINTENANCE Remember that dirty filters are the most common cause of WARNING inadequate heating or cooling performance. TO AVOID ELECTRICAL SHOCK, INJURY OR DEATH, WARNING DISCONNECT ELECTRICAL POWER BEFORE PER- FORMING ANY MAINTENANCE. DISCONNECT THE ELECTRICAL POWER TO THE FUR- NACE BEFORE REMOVING THE FILTER OR PER- CAUTION FORMING ANY OTHER MAINTENANCE.
  • Page 54 MAINTENANCE 3. Remove filters 9. Clean residue from furnace using a vacuum cleaner. 4. Remove blower compartment door. Vacuum compart- 10. Replace the parts removed in the previous steps in re- ment. Replace blower compartment door. verse order. 5. Replace filters opposite of removal. 11.

  • Page 55: Servicing

    SERVICING TEST EQUIPMENT Multiplying the ninety (90) cubic feet by 1025 BTU gives us an input of 92,250 BTUH. Proper test equipment for accurate diagnosis is as essen- tial as regulator hand tools. Checking the BTU input on the rating plate of the furnace being tested.
  • Page 56 SERVICING 1 Million 10 Thousand 1 Thousand 100 Thousand CUBIC Quarter FEET Foot Foot GAS RATE - CUBIC FEET PER HOUR GAS RATE -- CUBIC FEET PER HOUR Size of Test Dial Size of Test Dial Seconds Seconds for One cu/ft cu/ft cu/ft...
  • Page 57 SERVICING Complaint No Heat Unsatisfactory Heat POSSIBLE CAUSE Test Method DOTS IN ANALYSIS Remedy GUIDE INDICATE "POSSIBLE CAUSE" Power Failure Test Voltage Blown Fuse Test Voltage Loose Connection Check Wiring Shorted or Broken Wires Check Wiring No Low Voltage Check Transformer Faulty Thermostat Check Thermostat Faulty Transformer...
  • Page 58 SERVICING SECTION INDEX S-1 Checking Voltage S-2 Checking Wiring S-3 Checking Thermostat, Wiring, and Anticipator 59-60 S-4 Checking Transformer and Control Circuit S-5 Checking Primary Limit Control 60-61 S-6 Checking Auxillary Limit Control S-7 Checking Blower Motor 61-62 S-8 Checking Capacitor S-8A Resistance Check S-8B Capacitance Test S-9 Checking Gas Valve...
  • Page 59 SERVICING S-3 CHECKING THERMOSTAT, WIRING, AND S-1 CHECKING VOLTAGE ANTICIPATOR Disconnect Electrical Power Supply: 1. Remove blower compartment door from furnace to gain entry to Junction Box. S-3A Thermostat and Wiring 2. Remove cover from Junction Box to gain access to in- WARNING coming power lines.
  • Page 60 SERVICING With Power On (and Door Interlock Switch Closed): GUCA / GCCA Ignition Control Heat Anticipator Setting WARNING White-Rodgers 50A55-288 .70 amps Heatcraft HSI-2 .70 amps LINE VOLTAGE NOW PRESENT. If the anticipator current draw is unknown, then an amp 3.
  • Page 61 T.O.D. PRIMARY LIMIT (201629__) Part Number Reset Open Setting White Orange Color Code(s) Green Blue Brown Yellow Button GUCA045AX30 GUCA070AX30 GUCA070AX40 GUCA090AX40 Color GUCA090AX50 GUCA115AX50 Identifing GCCA045AX30 GCCA070AX30 Testing Auxiliary Limit Control GCCA070AX40 GCCA090AX40...
  • Page 62 SERVICING If the windings do not test continuous or a reading is ob- Good Condition - indicator swings to zero and tained from lead to ground, replace the motor. slowly returns toward infinity. 5. After completing check and/or replacement of blower Shorted - indicator swings to zero and stops there motor, reinstall blower compartment door.
  • Page 63 SERVICING 2. Next, remove wire connections from gas valve termi- S-11 CHECKING ORIFICES nals. A predetermined fixed gas orifice is used in all of these 3. Using an ohmmeter, test across the gas valve coil ter- furnaces. That is an orifice which has a fixed bore and po- minals M1 and C2.
  • Page 64 SERVICING 6. After check and/or replacement of orifice(s) reinstall Gas Line manifold to burner bracket. 7. Turn on gas to furnace and check for leaks. If leaks are Gas Shutoff Valve found, repair and then reinstall burner compartment door. 8. Turn on electrical power and verify proper unit opera- Gas Line tion.
  • Page 65 SERVICING Gas Manifold Pressure Measurement and Adjustment 6. Turn the adjustment screw clockwise to increase the pressure, or counterclockwise to decrease the pressure. CAUTION 7. Securely replace the regulator cap. To prevent unreliable operation or equipment damage, WARNING the gas manifold pressure must be as specified on the unit rating plate.
  • Page 66 SERVICING S-15 CHECKING DUCT STATIC S-16 CHECKING TEMPERATURE RISE The maximum and minimum allowable external static pres- The more air (CFM) being delivered through a given fur- sures are found in the specification section. These tables nace, the less the rise will be; so the less air (CFM) being also show the amount of air being delivered at a given static delivered, the greater the rise.
  • Page 67 GCCA115AX50 20197307 Note: All installations above 7,000 ft. require a pressure switch change. For installations in Canada the Amana 90% furnace is certified only to 4500.ft. Note: Replacement pressure switch number is listed below high altitude kit number. Note: Minimum negative pressure required to activate the pressure switch is -0.52" w.c.
  • Page 68 SERVICING S-17 CHECKING PRESSURE CONTROL 5. Reconnect wires YL-20 to C (Common) and OR-22 to NO (Normally Open) terminals on ID Blower Pressure A pressure control device is used to measure negative pres- Switch and GY-34 to C (Common) and GY-12 to NO sure at the induced draft blower motor inlet to detect a par- (Normally Open) terminals on Coil Cover Pressure tial or blocked flue and also a pressure control device is...
  • Page 69 GUCA and GCCA models, and 30 to 175 ohms for for any discovered failures. When the control is powered igniter, Amana part number 20165702, used in later pro- up normally the light will flash once for about one second.
  • Page 70 SERVICING The indicator light may then be viewed by looking through S-21 CHECKING FLAME SENSOR the peep hole in the blower access door. Failure to hold the A flame sensing device is used in conjuction with the igni- door switch closed while removing the blower compartment tion control module to prove combustion.
  • Page 71 Color Code(s) Green Gray Yellow Orange White cleaned with emery cloth or steel wool. GUCA045AX30 GUCA070AX30 7. If absolutely no reading, check for continuity on all com- GUCA070AX40 GUCA090AX40 ponents and if good - replace ignition control module. GUCA090AX50 GUCA115AX50 8.
  • Page 72 5. Disconnect and remove the flue couplings and inner R Kit # Used on Models vent/flue pipe (GUCA Only) along with rubber elbow R9800656 GUCA045AX30 (Standard Vent/Flue Connection) or rubber coupling (Al- R9800657 GUCA070AX30 ternate Vent/Flue Connection) that are attached to in-...
  • Page 73 SERVICING Reinstallation of New Heat Exchanger: 7. Reinstall the inner gas supply piping and reconnect to gas supply line removed in Step 2 of removal proce- Note: Before installing new heat exchanger assembly, in- dures. spect gasket along inside rails. If the gasket needs replac- ing, install the new pieces of gasket supplied with kit.

  • Page 74: Wiring Diagrams

    CONNNECTIONS FIELD CLEANER ELECTRONIC HUMIDIFIER XFMR-H TERMINALS NEUTRAL CONNECTOR WH-33 PK-30 VT-25 YL-20 OR-15 RD-11 GY-12 BR-13 BU-14 CONNECTIONS THERMOSTAT MODULE CONTROL INTEGRATED MODULE CONTROL INTEGRATED TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY, WARNING OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
  • Page 75 CONNNECTIONS FIELD CLEANER ELECTRONIC HUMIDIFIER XFMR-H TERMINALS UTRAL WH-33 CONNECTOR PK-30 VT-28 VT-25 YL-20 OR-15 RD-11 GY-12 BR-13 BU-14 CONNECTIONS MOSTAT THER MODULE CONTROL INTEGRATED MODULE CONTROL INTEGRATED TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY, WARNING OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.

  • Page 76: Schematics

    SCHEMATICS TYPICAL SCHEMATIC GUCA MODEL FURNACES 10207709 WR50A55 INTEGRATED IGNITION CONTROL This schematic is for reference only. Not all wiring is as shown above, refer to the appropriate wiring diagram for the unit being serviced. Rev. 0...
  • Page 77 SCHEMATICS TYPICAL SCHEMATIC GCCA MODEL FURNACES 11184504 HSI-2 INTEGRATED IGNITION CONTROL This schematic is for reference only. Not all wiring is as shown above, refer to the appropriate wiring diagram for the unit being serviced. Rev. 0...

  • Page 78: Schematics

    SCHEMATICS * Tape wire ends if not used. FURNACE TWINING KIT - FTK03A This schematic is for reference only. Not all wiring is as shown above, refer to the appropriate wiring diagram for the unit being serviced. Rev. 0...

This manual is also suitable for:

Guca115ax50Guca070ax30Guca070ax40Guca090ax40Gcca045ax30Gcca070ax30 ... Show all

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