Goodman GMVM Service Instructions Manual
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Goodman GMVM Service Instructions Manual

96% modulating gas furnaces & accessories
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Service Instructions

96% Modulating Gas Furnaces
ACVM, AMVM, GCVM, GMVM
& Accessories
RS6612001r9
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
November 2013
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.
Copyright © 2011 - 2013 Goodman Manufacturing Company, L.P.
1

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  • Page 1: Service Instructions

    Maytag Corporation or its related companies and is used under license to Goodman Company, L.P., Houston, TX. All rights reserved. Copyright © 2011 - 2013 Goodman Manufacturing Company, L.P.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS IMPORTANT INFORMATION ......2-3 ABBREVIATIONS & OPERATION ..... 60 PRODUCT IDENTIFICATION ......4 - 7 SERVICE AND OPERATION ......61 - 62 ACCESSORIES ........... 8 - 10 OPERATIONAL CHECKS ......63 - 64 LIGHTING INSTRUCTIONS ....... 11 MAINTENANCE ..........65 PRODUCT DESIGN ........12 - 31 SERVICING TABLE OF CONTENTS ....

  • Page 3: Important Information

    (Not a technical assistance line for dealers.) Your telephone company will bill you for the call. 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.

  • Page 4: Product Identification

    @ 0.5" ESP 3: 1200 COMMUNICATION FEATURE 4: 1600 M: Modulating Furnace 5: 2000 4-Wire Communication Ready 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.
  • Page 5 Induced Draft, ClimateTalk™ communicating furnace. Modulating gas input from 35% -100% of rated input. 4 wire serial ECM motor. Independent humidification with capable thermostat. Goodman® Brand 96% Modulating Gas Furnace, same as the AA revision above but BA GCVM96****** GCVM96******BA models furnace cabinet Air Leakage must be <2.0%.
  • Page 6 USB plug allowing dealers the ability to insert pre-programmed operating parameters and dealer information by use of an online data entry system. Communicating Thermostat Kit- Digitally communicating touchscreen thermostat from Honeywell. Designed for use with compatible Amana® Brand or Goodman® Brand Air Handlers or Furnaces and outdoor split AC or CTK03A* CTK03A* Heat Pump units.

  • Page 7: Product Identification

    MFG # DESCRIPTION LP Gas Low Pre ssure Kit . Designe d for application on Goodman® and Amana® Brand's 80% and 9 0% LPLP03 single-stag e, two-stage and modulating fu rnaces converted to LP gas. The kit monitors gas line pressure with a pressure switch and will open the circuit to the gas valve if the LP tank pressure gets l ow.

  • Page 8: Accessories

    ACCESSORIES ® AMANA BRAND Furnace Accessories M ODEL AFE180-60A AM U / GM U ASAS / GSAS CFB17 CFB21 CFB24 CTK01* CTK02** CTK03AA NUM BER Downflow Downflow Downflow Com. Thermostat Thermostat Fossil Fuel M edia Electronic Description Subbase Subbase Subbase Thermostat Air Cleaners Air Cleaner...
  • Page 9 ACCESSORIES ® GOODMAN BRAND Furnace Accessories M ODEL AFE180-60A AM U / GM U ASAS / GSAS CFB17 CFB21 CFB24 CTK01* CTK02** CTK03AA NUM BER Downflow Downflow Downflow Com. Thermostat Thermostat Fossil Fuel M edia Electronic Description Subbase Subbase Subbase...
  • Page 10 ACCESSORIES SLOTS IN FILTER EXTERNAL FILTER RACK (EFR01 ) CLEAR SCREWS ON UNIT BLOWER DECK SCREWS Used on 96% Upflow Modulating Furnaces UNIT SIDE PANEL FRONT OF UNIT FILTER RACK ASSEMBLY (FACE FILTER OPENING BASE TOWARDS FRONT OF UNIT OF UNIT) RETURN AIR CUTOUT AREA LOWER EDGE...

  • Page 11: Lighting Instructions

    LIGHTING INSTRUCTIONS FOR YOUR SAFETY LIRE AVANT DE METTRE READ BEFORE OPERATING EN MARCHELIRE WARNING: AVERTISSEMENT: If you do not follow these instructions Quiconque ne respecte pas à Exactly, a fire or explosion may result causing property la lettre les instructions dans le presént manuel damage, personal injury or loss of life.

  • Page 12: Product Design

    PRODUCT DESIGN Adhere to the following warnings and cautions when installing, adjusting, altering, servicing, or operating the furnace. To ensure proper installation and operation, thoroughly read this manual for specifics pertaining to the installation and appli- cation of this product. WARNING WARNING O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER...

  • Page 13: General Information

    Schools, Office buildings, Churches, Retail stores, Nursing homes, Hotels/motels, General Information Common or office areas The modulating furnace is part of the Goodman® brand & In such applications, the furnace must be installed with the Amana® brand family of communicating ready products. The following stipulations: furnace may be used with conventional single or multi-stage •...
  • Page 14 PRODUCT DESIGN To ensure proper furnace operation, install, operate and • All other warranty exclusions and restrictions apply This maintain the furnace in accordance with these installa- furnace is an ETL dual-certified appliance and is appropri- tion and operation instructions, all local building codes ate for use with natural or propane gas (NOTE: If using and ordinances.
  • Page 15 (stainless steel for Amana Brand, alumi- niter has a resistance range of 37 - 68 ohms. The H.S.I. is nized for Goodman) the heat exchanger assembly consists connected electrically to the IFC by a 3/16" push-on connec- of primary and secondary sections crimped together on a tion.
  • Page 16 PRODUCT DESIGN • When the modulating furnace is installed with a com- WARNING municating thermostat and a non-communicating a/c unit, the IFC will open the Y1 relay to turn off the con- O PREVENT POSSIBLE EQUIPMENT DAMAGE PROPERTY DAMAGE densing unit PERSONAL INJURY OR DEATH THE FOLLOWING BULLET POINTS MUST BE •...
  • Page 17 PRODUCT DESIGN • Exposure to contaminated combustion air will result in • Counterflow Installation over a noncombustible floor. Be- safety and performance-related problems. Do not install fore setting the furnace over the plenum opening, ensure the furnace where the combustion air is exposed to the the surface around the opening is smooth and level.
  • Page 18 PRODUCT DESIGN 8. If improper venting is observed during any of the above T O P tests, the venting system must be corrected in accordance T O P with the National Fuel Gas Code ANSI Z223.1/NFPA 54 and/or National Gas and Propane Installation Code CSA B149.1-05.

  • Page 19: Installation Positions

    PRODUCT DESIGN If this furnace is to be installed in the same space with other gas URNACE USPENSION appliances, such as a water heater, ensure there is an adequate If suspending the furnace from rafters or joists, use 3/8" threaded supply of combustion and ventilation air for the other appliances.
  • Page 20 PRODUCT DESIGN LTERNATE LUE AND OMBUSTION ONNECTIONS LTERNATE LECTRICAL AND ONNECTIONS In horizontal installations with the furnace laying on the left This furnace has provisions allowing for electrical and gas line hand side, the alternate vent connection may be used. In connections through either side panel.
  • Page 21 PRODUCT DESIGN used. Fittings must be DWV type fittings meeting ASTM D2665 Vent/Flue Pipe & Combustion Air Pipe and ASTM D3311. Carefully follow the pipe manufacturer’s in- structions for cutting, cleaning, and solvent cementing of PVC. WARNING The use of Schedule 40 PVC or ABS cellular core (Foam Core) plastic pipe is also acceptable as a flue/vent and intake pipe AILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY material.
  • Page 22 PRODUCT DESIGN ACCEPTABLE • The vent termination of a direct vent application must ter- minate at least 12 inches from any opening through which flue gases may enter a building (door, window, or gravity air inlet). • The vent termination of vent pipe run vertically through a TRANSITION NO LESS roof must terminate at least 12 inches above the roof line THAN 45 DEGREES TO...
  • Page 23 PRODUCT DESIGN DIRECT VENT TERMINAL CLEARANCES Canadian Installations U.S. Installations Canadian Installations U.S. Installations Clearance to service 3 ft. (91 cm). A= Clearance above grade, 12 in. (30 cm) 12 in. (30 cm) regulator vent outlet. veranda, porch, deck or balcony.
  • Page 24 PRODUCT DESIGN PECIAL ENTING EQUIREMENTS NSTALLATIONS OMBUSTION ANADA IRECT NSTALLATIONS All installations in Canada must conform to the requirements On upflow units secure the combustion air intake pipe directly to of CSAB149 code. All vent system components, including the air intake coupling. On counterflow units secure the com- primer and cement, must be listed to ULC S636.
  • Page 25 PRODUCT DESIGN 2. Upflow and Counterflow units. Counterflow units. Loosen the worm gear hose clamps on the rubber el- Remove plastic plug from alternate vent/flue location. bow and detach it from both the induced draft blower Relocate and install plug in standard vent/flue location and the vent/flue pipe.
  • Page 26 PRODUCT DESIGN REMOVE PIPE EXTERNALLY EXTERNALLY REMOVE MOUNT MOUNT AND RELOCATE RUBBER ELBOW RUBBER ELBOW CABINET PLUG AND SECURE FLANGE AND SECURE FLANGE WITH 4 SCREWS WITH 4 SCREWS REMOVED IN STEP 1 REMOVED IN STEP 1 DETACH RUBBER ELBOW FROM ID BLOWER AND VENT/FLUE PIPE...
  • Page 27 PRODUCT DESIGN 7. Upflow and Counterflow units. IRECT INGLE IPING Non-direct vent installations require only a vent/flue pipe. The For upright installations, externally mount the rubber vent pipe can be run horizontally with an exit through the side of elbow to the vent/flue coupling using a worm gear hose the building or run vertically with an exit through the roof of the clamp.
  • Page 28 PRODUCT DESIGN ERMINATIONS 12" MIN. NOTE: If either a 90 degree or 45 degree elbow is used for termination, it must be pointed downward. The vent/flue pipe may terminate vertically, as through a roof, or VENT/FLUE TEE ( OPTIONAL) horizontally, as through an outside wall. 45°...
  • Page 29 PRODUCT DESIGN If the combustion air intake pipe is to be installed above a finished 10”- 24” ceiling or other area where dripping of condensate will be objec- tionable, insulation of the combustion air pipe may be required. Use 1/2” thick closed cell foam insulation such as Armaflex™ or Insultube™...
  • Page 30 PRODUCT DESIGN 90° ELBOWS 3”MIN 24”MAX 12” MIN SEPARATION 3”-24” BETWEEN PIPES 3” MIN INTAKE SCREEN (OPTIONAL) OPTIONAL 12" MIN. ABOVE INTAKE HIGHEST ANTICIPATED SCREENS SNOW LEVEL 12” MIN TO GRADE OR HIGHEST ANTICIPATED SNOW LEVEL Combustion Air Intake may also be snorkeled to obtain 12” min Termination of Multiple Direct Vent Furnaces ground clearance.

  • Page 31: Product Design

    PRODUCT DESIGN • If an air conditioning coil is installed with the furnace, a Condensate Drain Lines & Drain Trap common drain may be used. An open tee must be A condensing gas furnace achieves its high level of efficiency by installed in the drain line, near the cooling coil, to relieve extracting almost all of the heat from the products of combustion positive air pressure from the coil’s plenum.

  • Page 32: Operation

    OPERATION 4. Insert Tube 1 into rubber elbow drain port and secure PRIGHT NSTALLATIONS RAP ON IGHT with silver hose clamp. Angle tube outward toward In a upright installation drain hoses are connected to drain ports front of furnace. on the rubber elbow and the recuperator coil front cover. The drain lines are then routed through the right side panel and into the 5.
  • Page 33 OPERATION LTERNATE RAIN ONNECTIONS 6. Cut 17 3/4 inches from the long end of Hose B and dis- card. Upright installations using the alternate vent/flue outlet will require “right-side only” drain hoses to be connected as follows. Refer to 7. Secure straight end of Hose B to exposed end of Tube Vent/Flue Pipe and Combustion Air Pipe for details on alternate 1 with a green hose clamp.
  • Page 34 OPERATION 5. Cut “X” inches from the long end of Hose B and dis- PRIGHT NSTALLATIONS RAP ON card. Refer to table for appropriate length to cut. Se- NOTE: For left side trap installation, grommets must be moved cure remaining hose to Tube 1 with a green hose to the left side of the furnace and the plugs installed on the right clamp.
  • Page 35 OPERATION 3. Cut 1/4 inch from the end of the drain port on the rubber ORIZONTAL NSTALLATIONS elbow and discard. IGHT 4. Insert Tube 1 into rubber elbow drain port and secure Horizontal installations with the right side down require that the with a silver hose clamp.
  • Page 36 OPERATION 7. Insert approximately one inch of each Tube 2 through left Horizontal installations with the left side panel down will require side panel grommet hole. Secure tubes to Hose A and drain hoses to be connected to the left side front cover drain port Hose B with a green hose clamps.

  • Page 37: Electrical Connections

    OPERATION Line polarity must be observed when making field connections. Electrical Connections Line voltage connections can be made through either the right or left side panel. The furnace is shipped configured for a right WARNING side (left side for counterflows) electrical connection with the HIGH VOLTAGE ! junction box located inside the burner compartment.
  • Page 38 OPERATION To ensure proper unit grounding, the ground wire should run IMPORTANT NOTE from the furnace ground screw located inside the furnace junc- tion box all the way back to the electrical panel. NOTE: Do not “R” HERMOSTAT REQUIRED IF OUTDOOR UNIT IS EQUIPPED WITH A use gas piping as an electrical ground.
  • Page 39 OPERATION 24 V EHUMIDISTAT IRING The optional usage of a dehumidistat allows the furnace’s circula- tor blower to operate at a slightly lower speed (85% of desired speed) during a combined thermostat call for cooling and dehu- Furnace Integrated midistat call for dehumidification. This can be done through an Control Module independent dehumidistat or through a thermostat’s DEHUM ter- minal (if available).

  • Page 40: Gas Supply And Piping

    OPERATION 115 V If it is necessary for the installer to supply additional line voltage ONNECTION OF CCESSORIES UMIDIFIER AND wiring to the inside of the furnace, the wiring must conform to all LECTRONIC LEANER local codes, and have a minimum temperature rating of 105°C. All line voltage wire splices must be made inside the furnace WARNING junction box.
  • Page 41 OPERATION ROPANE ONVERSION Natural Gas Capacity of Pipe In Cubic Feet of Gas Per Hour (CFH) Length of Nominal Black Pipe Size WARNING Pipe in Feet 1/2" 3/4" 1" 1 1/4" 1 1/2" 1050 1600 OSSIBLE PROPERTY DAMAGE PERSONAL INJURY OR DEATH MAY 1100 OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER...

  • Page 42: Gas Piping Connections

    OPERATION GAS VALVE MANUAL MANIFOLD BURNERS SHUT OFF VALVE (UPSTREAM FROM GAS LINE PIPE UNION) PLUG IN PLUG IN ALTERNATE GAS LINE GAS LINE HEIGHT REQUIRED HOLE HOLE BY LOCAL CODE GROMMET IN STANDARD GAS LINE HOLE GAS VALVE PIPE UNION DRIP LEG DRIP LEG BURNERS...
  • Page 43 OPERATION • Tighten all joints securely. IPING HECKS • Connect the furnace to the building piping by one of the Before placing unit in operation, leak test the unit and gas con- following methods: nections. – Rigid metallic pipe and fittings. WARNING –...
  • Page 44 OPERATION 2. Proper pressure regulation. (Two-stage regulation is Sizing Between Second or Second Stage Regulator & Appliance* Maximum Propane Capacities listed are based on 1/2" W.C. pressure drop at 11" W.C. setting. recommended for both cost and efficiency). Capacities in 1,000 BTU/hour. Pipe or 3.
  • Page 45 OPERATION Too much external static pressure will result in insufficient OTTOM ETURN PENING PFLOW ODELS air that can cause excessive temperature rise. This can cause The bottom return air opening on upflow models utilizes a “lance limit switch tripping and heat exchanger failure. and cut”...
  • Page 46 OPERATION ILTERS ECTION EFORE NSTALLING ETURN PRIGHT NSTALLATIONS Depending on the installation and/or customer preference, differ- UCT WORK ing filter arrangements can be applied. Filters can be installed in Filters must be used with this furnace. Discuss filter maintenance the central return register or a side panel external filter rack kit with the building owner.
  • Page 47 OPERATION ORIZONTAL NSTALLATIONS Filters must be installed in either the central return register or in the return air duct work. IGNITION (80%) Startup Procedure & Adjustment Furnace must have a 115 VAC power supply properly connected 10 MINS. and grounded. Proper polarity must be maintained for correct operation.
  • Page 48 OPERATION • The IFC remains at the current firing rate until the 1st- Stage call for heat is satisfied. 10 MINS. CTK01 T EATING PERATION WITH HERMOSTAT OMMUNI 8 MINS. IGNITION CATING (80%) • When the Thermostat Heat Setup DIP switch is set to 2-Stage heat, the IFC operation will be compatible with a CTK01communicating thermostat.
  • Page 49 OPERATION URNACE PERATION UPPLY RESSURE EASUREMENT Purge gas lines of air prior to startup. Be sure not to purge lines into an enclosed burner compartment. CAUTION Check for leaks using an approved chloride-free soap and water solution, an electronic combustible gas detector, or other ap- O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE proved method.
  • Page 50 OPERATION 1. Turn OFF gas to furnace at the manual gas shutoff Gas Line valve external to the furnace. 2. Connect a calibrated water manometer (or appropriate Shutoff Valve gas pressure gauge) at either the gas valve inlet pres- sure boss or the gas piping drip leg. See Honeywell VR9205R gas valve figure for location of inlet pressure Gas Line boss.
  • Page 51 OPERATION 8. Field Test Mode is intended to help a service person 4. Calculate the furnace input in BTUs per hour (BTU/hr). troubleshoot and check out an installed appliance by Input equals the sum of the installation’s gas heating bringing the furnace up to High fire (100% input), by-pass- value and a conversion factor (hours to seconds) di- ing the normal modulating routine.
  • Page 52 OPERATION 2. Determine the proper air flow for the cooling system. Most cooling systems are designed to work with air flows between 350 and 450 CFM per ton. Most manu- facturers recommend an air flow of about 400 CFM per ton.
  • Page 53 DIP Switches...
  • Page 54 OPERATION DIP S • Profile A provides only an OFF delay of one (1) minute at WITCHES 100% of the cooling demand airflow. There are 18 DIP switches on the modulating furnace IFC. Switches are located in 3 rows, each having 6 switches. Switches are numbered from 1 to 18.
  • Page 55 OPERATION Switch 14 Selects compressor setup for cooling. Factory System Operating System Airflow Demand Source position is OFF. This is the correct position for a single stage Mode condensing unit. In this position, Y from the room thermostat Cooling Air Conditioner would connect to Y1 on the IFC.

  • Page 56: Operation

    OPERATION CTK0* W IRING • R powering Y1, O and G simultaneously • The compressor and condenser fan are energized di- NOTE: Refer to Electrical Connections for 115 volt line rectly from the Y1 terminal from the thermostat. connections to the furnace. •...
  • Page 57 OPERATION ™ C LIMATE OMMUNICATION The IFC has two LEDs : ONVENTIONAL HERMOSTAT Two seconds after G request becomes active without Y1 re- • Red communications LED – Indicates the status of quest, IFC will run the circulator at the appropriate speed (as the network selected by the DIP switches), unless circulator is running •...

  • Page 58: Comfortnet™ Systems

    ABBREVIATIONS & DEFINITIONS The indoor unit, outdoor unit and thermostat comprising a 7. Select the heating speed for your model from the heat- ComfortNet system “communicate” digitally with one another, cre- ing speed chart in the Specification Sheet. The “ad- ating a two-way communications path.

  • Page 59: Abbreviations & Definitions

    ABBREVIATIONS & DEFINITIONS • LPS: Low pressure switch Pressure Switch Calibration Routine The modulating • IDB: Induced draft blower furnace must go through a pressure switch calibration rou- tine before it can begin its first heat cycle. This is performed •...

  • Page 60: Abbreviations & Operation

    This data ceeds to the HSI Warm-up and then a new Trial for will be programmed in at the Goodman factory. Ignition is started again for up to a maximum of two additional trials (3 attempts total). After the third Trial...

  • Page 61: Service And Operation

    SERVICE & OPERATION • The circulator if already running remains energized at Pressure Switch Configuration the current CFM for the circulator fan off delay period. • The IFC monitors the contacts of a SPST (single pole • When the Inter-purge Period expires, the control pro- single throw) low pressure switch with a set point that ceeds to the HSI Warm-up and then a new Trial for ensures the switch will be closed at approximately 35%...
  • Page 62 ECM Motor An Emerson® UltraTech® four wire indoor fan motor provides supply air to the conditioned space. This is the same motor used on Goodman & Amana previous generation communi- cating furnaces. The ECM motor consists of two sections; 1. A motor body containing 3 phase motor windings 2.

  • Page 63: Operational Checks

    OPERATIONAL CHECKS LED Status Indication Possible Causes Corrective Action(s) • Normal condition • None • None 2 Flashes • Out-of-box reset • Control power up • None Communications • Learn button depressed Rapid Flashing • Normal network traffic • Control is “talking” on •...
  • Page 64 OPERATIONAL CHECKS To use a memory chip; RESSURE WITCHES 1. Power down all HVAC equipment in the system. The pressure switches are normally-open (closed during opera- tion) negative air pressure-activated switches. They monitor the 2. As when handling any electronic components, discharge airflow (combustion air and flue products) through the heat ex- any static electricity you may be carrying by touching changer via pressure taps located on the induced draft blower...

  • Page 65: Maintenance

    MAINTENANCE Maintenance ILTERS CAUTION WARNING O ENSURE PROPER UNIT PERFORMANCE ADHERE TO THE FILTER SIZES O AVOID ELECTRICAL SHOCK INJURY OR DEATH GIVEN IN THE RECOMMENDED INIMUM ILTER ABLE OR DISCONNECT ELECTRICAL POWER BEFORE PERFORMING ANY PECIFICATION HEET APPLICABLE TO YOUR MODEL MAINTENANCE F YOU MUST HANDLE THE IGNITER HANDLE WITH CARE...

  • Page 66: Servicing Table Of Contents

    SERVICING SERVICING CHECKING VOLTAGE ......... 67 S-306 CHECKING ORIFICES ......... 71 CHECKING WIRING ........67 S-307 CHECKING GAS PRESSURE ..... 71 S-3A THERMOSTAT AND WIRING ....... 67 S-308 CHECKING HOT SURFACE IGNITOR ..72 S-3B HEATING ANTICIPATOR/ CYLCE RATE ..68 S-309 CHECKING FOR FLASHBACK ....

  • Page 67: Checking Voltage

    SERVICING S-1 CHECKING VOLTAGE 1. Check wiring visually for signs of overheating, damaged insulation and loose connections. 2. Use an ohmmeter to check continuity of any suspected WARNING open wires. 3. If any wires must be replaced, replace with AWM, 105°C. HIGH VOLTAGE 2/64 thick insulation of the same gauge or its equivalent.

  • Page 68: S-3B Heating Anticipator/ Cylce Rate

    SERVICING S-3B HEATING ANTICIPATOR/ CYLCE RATE S-300 CHECKING PRIMARY LIMIT CONTROL Older heating thermostats may have an adjustable anticipa- All modulating furnaces use a nonadjustable, automatic re- tor. This is a wire wound adjustable heater which is ener- set, bi-metal type limit control. The primary limit control is gized during the "ON"...

  • Page 69: Checking Flame Rollout Control

    SERVICING S-303 INDUCED DRAFT BLOWER MOTOR Induced Draft Blower (IDB) AUXILIARY LIMIT CONTROL All modulating furnace models use a three phase induced draft blower to draw flue gases through the heat exchanger. The inducer uses ball bearings and is permanently lubricated.
  • Page 70 SERVICING MODULATING FURNACE PNEUMATIC TUBING DIAGRAM Low & High Pressure Switch Assembly Front Cover with “H” Fitting Pressure Switch Black Tee MUST be left open Modulating Gas Valve + Port is Open Negative (-) to the Atmosphere Port on Gas Valve Upflow Model Shown For representation only.

  • Page 71: Checking Main Burners

    The supply pressure must ® ® A fixed gas orifice is used in all Goodman brand & Amana be measured with the burners operating. To measure the brand furnaces. That is an orifice which has a fixed bore gas supply pressure, use the following procedure.

  • Page 72: Checking Hot Surface Ignitor

    SERVICING GAS LINE Manifold pressure for natural gas is pre-set to be between 3.2” WC to 3.8”WC. If the furnace has been converted to LP GAS SHUTOFF VALVE gas, the manifold pressure will be 9.7”WC to 10.3”W. Manifold Gas Pressure Natural Gas 3.5"...

  • Page 73: High Altitude Application

    SERVICING If switch reads as above proceed to Step 4, otherwise re- S-313 CHECKING INTEGRATED IGNITION place control. CONTROL BOARDS 4. Remove the pressure control hose from the control and NOTE: Failure to earth ground the furnace, reversing the interconnect with an inclined manometer as shown in neutral and hot wire connection to the line (polarity), or a the following figures.

  • Page 74: Checking Flame Sensor

    SERVICING NOTE: Contaminated fuel or combustion air can create a S-314 CHECKING FLAME SENSOR nearly invisible coating on the flame sensor. This coating A flame sensing device is used in conjunction with the igni- works as an insulator causing a loss in the flame sense tion control module to prove combustion.

  • Page 75: Troubleshooting

    Troubleshooting...
  • Page 76 Troubleshooting...
  • Page 77 Troubleshooting...
  • Page 78 Troubleshooting...
  • Page 79 Troubleshooting...

  • Page 80: Status Codes

    Status Codes NO POWER NORMAL OPERATION INDICATES AIRFLOW, FOLLOWED BY CFM BLOWER MOTOR NOT RUNNING BLOWER COMMUNICATION ERROR BLOWER HP MIS-MATCH BLOWER MOTOR OPERATING IN POWER, TEMPERATURE, OR SPEED LIMIT BLOWER MOTOR CURRENT TRIP OR LOST ROTOR BLOWER MOTOR LOCKED ROTOR BLOWER OVER/UNDER VOLTAGE TRIP OR OVER TEMPERATURE TRIP INCOMPLETE PARAMETERS SENT TO MOTOR LOW INDOOR AIRFLOW...

  • Page 81: Wiring Diagram

    Wiring Diagram *MVM96_A*, *CVM96_A* TO 115VA C/1 Ø /60 HZ PO W ER SUPPLY W ITH OVERCURRENT PROTECTION DEVICE DIS CO NNE CT POW ER BEFORE SERVICING W IRING TO UNIT MUST BE PROP ERLY POLARIZE D A ND O PTIONAL O PTIO NAL D EH UM FR ONT COVER...

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