Service Instructions Modulating Gas Furnaces, up to 98% AFUE 34.5" Chassis ACVM, AMVM, GCVM, GMVM & Accessories 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 procedures or services performed by an unqualified person. RS6612009r4 August 2016 is a registered trademark of Maytag Corporation or its related companies and is used under license to Goodman Company, L.
TABLE OF CONTENTS IMPORTANT INFORMATION ...................... 2-4 OPERATIONAL CHECKS ...................... 49 - 51 PRODUCT IDENTIFICATION .................... 5 - 8 MAINTENANCE ...................................... 52 ACCESSORIES ................................... 9 - 11 SERVICING TABLE OF CONTENTS ................ 53 LIGHTING INSTRUCTIONS ......................... 12 SERVICING ..................................... 54 - 62 PRODUCT DESIGN ............................ 13 - 24 TROUBLESHOOTING ....
IMPORTANT INFORMATION To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this product. For further assistance, please contact: CONSUMER INFORMATION LINE GOODMAN® BRAND PRODUCTS TOLL FREE 1-877-254-4729 (U.S. only) email us at: customerservice@goodmanmfg.com fax us at: (731) 856-1821 (Not a technical assistance line for dealers.) CONSUMER INFORMATION LINE AMANA® BRAND PRODUCTS TOLL FREE 1-877-254-4729 (U.S. only) email us at: hac.consumer.
IMPORTANT INFORMATION CO can cause serious illness including permanent brain damage or death. B10259-216 Advertencia especial para la instalación de calentadores ó manejadoras de aire en áreas cerradas como estacionamientos ó cuartos de servicio. Las emisiones de monóxido de carbono pueden circular a través del aparato cuando se opera en cualquier modo. El monóxido de carbono puede causar enfermedades severas como daño cerebral permanente ó muerte.
PRODUCT IDENTIFICATION G PRODUCT TYPE: G: Goodman® Brand A: Amana® Brand M V M 97 060 3 B N FURNACE TYPE V: Variable-Speed CABINET WIDTH B: 17-1/2" C: 21" D: 24-1/2" A A MAJOR REVISION A: Initial Release MINOR REVISION A: Initial Release NOMINAL INPUT 060: 60,000 Btuh 080: 80,000 Btuh 100: 100,000 Btuh 120: 120,000 Btuh ADDITIONAL FEATURES N: Natural Gas X: Low NOx SUPPLY TYPE M: Upflow/Horizontal C: Downflow/Horizontal AFUE 97: 97% COMMUNICATION FEATURE M: Modulating Furnace 4-Wire Commun
PRODUCT IDENTIFICATION MODEL: AMVM97 REV AA MODEL: ACVM97 REV AA Equipment Type Amana Brand Residential Gas Furnace Equipment Type Amana Brand Residential Gas Furnace Heating Stages Modulating (35% - 100% of rated input) Heating Stages Modulating (35% - 100% of rated input) Cooling Stages Two Cooling Stages Two Control Type ClimateTalk ™ or Conventional 24 Volt Control Type ClimateTalk ™ or Conventional 24 Volt Blower Motor Type 4 Wire Variable Speed ECM Blower Motor Type 4 Wire Varia
PRODUCT IDENTIFICATION MODEL # MFG # DESCRIPTION AFE18-60A N/A Fossil Fuel Kit. The AFE18-60A control is designed for use where the indoor coil is located above/downstream of a gas or fossil fuel furnace when used with a heat pump. It will operate with single and two stage heat pumps and single and two stage furnaces. The AFE18-60A control will turn the heat pump unit off when the furnace is turned on. An anti-short cycle feature initiates a 3 minute timed off delay when the compressor goes off.
PRODUCT IDENTIFICATION MODEL # MFG # DESCRIPTION N/A Concentric Vent Kit. For use with Amana® Brand Modulating furnace models. This kit is designed to allow terminations of a direct vent furnace to be "concentrically" vented through a wall or roof. This kit allows a single penetration to support terminations for both the vent/flue and the combustion air intake pipe. The DCVK-20 (2") and DCVK-30 (3") kits are certified for models listed above.
X X *MVM971005CN** X X X X X X X X *MVM971205DN** X X X X X X X X *CVM970603BN** X X X X X X X X *CVM970803BN** X X X X X X X X *CVM970804CN** X X X X X X X X *CVM971005CN** X X X X X X X X LPM-09 X L.P.
ACCESSORIES EXTERNAL FILTER RACK (EFR02) Used on 97% Upflow Modulating Furnaces SLOTS IN FILTER CLEAR SCREWS ON UNIT BLOWER DECK SCREWS UNIT SIDE PANEL FRONT OF UNIT FILTER RACK ASSEMBLY (FACE FILTER OPENING TOWARDS FRONT OF UNIT) BASE OF UNIT RETURN AIR CUTOUT AREA LOWER EDGE SCREW CONCENTRIC VENT CONVERSION KIT (DCVK-20 & DCVK-30 [CVENT-2 & CVENT-3*]) The DCVK-20 (2") or the DCVK-30 (3") is a concentric vent See the section in this manual under "Vent Flue and Comkit approved with furnaces listed in
ACCESSORIES SIDE WALL VENT KIT (0170K00000S) LPM-09 LP CONVERSION KIT This side wall only vent kit #0170K00000S is to be used with 2” - 3” vent systems. This kit is NOT intended for use with single pipe (non-direct vent) installations. The vent kit must terminate outside the structure and may be installed with the intake and exhaust pipes located sideby-side or with one pipe above the other.
LIGHTING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATING LIRE AVANT DE METTRE EN MARCHELIRE WARNING: If you do not follow these instructions exactly,a fire or explosion may result causing property damage, personal injury or loss of life. AVERTISSEMENT: Quiconque ne respecte pas à la lettre les instructions dans le presént manuel risque de déclencher un incendie ou une explosion entraînant des dommages matériels, des lesions corporelles ou la perte de vies humaines. A.
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 application of this product. WARNING TO PREVENT POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK , THE FURNACE MUST BE LOCATED TO PROTECT THE ELECTRICAL COMPONENTS FROM WATER .
PRODUCT DESIGN WARNING SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MANUAL GAS SHUTOFF VALVE EXTERNAL TO THE FURNACE BEFORE TURNING OFF THE ELECTRICAL SUPPLY. WARNING POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE, EXPLOSION , SMOKE, SOOT, CONDENSATION , ELECTRICAL SHOCK OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION, REPAIR OPERATION, OR MAINTENANCE OF THIS PRODUCT.
PRODUCT DESIGN Acceptable Equipment Combinations With CTK0* Communicating Thermostat: 1. Modulating furnace alone 2. Modulating furnace with Goodman® brand / Amana® brand communicating split A/C or H/P unit (no separate dual fuel control is required) 3. Modulating furnace with non-communicating 1 stage A/C split unit (can not support a 2 stage A/C or a non-communicating heat pump). With Conventional Non-Communicating Thermostat (Single or Multi-Stage) 1. Modulating furnace alone. 2.
PRODUCT DESIGN A copy of the National Fuel Gas Code (NFPA 54/ANSI Z223.1) can be obtained from any of the following: American National Standards Institute 25 West 43rd Street, 4th Floor New York, NY 10036 National Fire Protection Association 1 Batterymarch Park Quincy, MA 02169-7471 • • CSA International 8501 East Pleasant Valley Cleveland, OH 44131 The rated heating capacity of the furnace should be greater than or equal to the total heat loss of the area to be heated.
PRODUCT DESIGN • If the furnace is installed horizontally, ensure the access doors are not on the “up/top” or “down/bottom” side of the furnace. • Do not connect this furnace to a chimney flue that serves a separate appliance designed to burn solid fuel. • On Counterflow Installations, the air conditioning coil must be downstream on the supply (positive) side of the furnace heat exchanger. • Counterflow Installation over a noncombustible floor.
PRODUCT DESIGN being called for. The power wires are colored red, white, and black. A green colored ground wire is also present. Hot Surface Igniter Modulating furnaces use a 115 volt silicon nitride hot surface igniter. This is the familiar and reliable 0131F00008S igniter with 17 second warm up time. At room temperature the igniter has a resistance range of 37 - 68 ohms. The H.S.I. is connected electrically to the IFC by a 3/16" pushon connection.
PRODUCT DESIGN WARNING TOP POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO FIRE, EXPLOSION , SMOKE, SOOT, CONDENSATION , ELECTRICAL SHOCK OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION, TOP S ID E S ID E S ID E REPAIR OPERATION, OR MAINTENANCE OF THIS PRODUCT.
PRODUCT DESIGN If this furnace is to be installed in the same space with other gas appliances, such as a water heater, ensure there is an adequate supply of combustion and ventilation air for the other appliances. Refer to the latest edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1 or CAN/CSA B149 Installation Codes or applicable provisions of the local building codes for determining the combustion air requirements for the appliances.
PRODUCT DESIGN DUCT CONNECTIONS Return duct must not be connected to the back of any furnace. Up flow furnaces installed vertically may have return air duct connections on either side or the furnace bottom. When airflow requirements are greater than 1,800 CFM for heating or cooling, both sides or a bottom return must be used. Down flow furnaces installed vertically must have the return duct connection on top the furnace.
PRODUCT DESIGN Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe) (6) PREFERRED Model *MVM970603BNA* *MVM970803BNA* *MVM970804CNA* *MVM971005CNA* *MVM971205DNA* *CVM970603BNA* ACCEPTABLE *CVM970803BNA* *CVM970804CNA* *CVM971005CNA* TRANSITION NO LESS THAN 45 DEGREES TO HORIZONTAL PLANE TO AVOID CREATING A WATER TRAP IN VENT PIPING.
PRODUCT DESIGN V X v DIRECT VENT TERMINAL CLEARANCES Canadian Installations 1 U.S. Installations 2 A= Clearance above grade, veranda, porch, deck or balcony. (See 1.24.6-i(9)b.) 12 in. (30 cm) 12 in. (30 cm) B= Clearance to window or door that may be opened. 6 in. (15 cm) for appliances 10,000 Btuh (3 kW), 12 in. (30 cm) for appliances > 10,000 Btuh (3 kW) and 100,000 Btuh (30 kW), 36 in. (91 cm) for appliances > 100,000 Btuh (30 kW). 6 in. (15 cm) for appliances 10,000 Btuh (3 kW), 9 in.
PRODUCT DESIGN Condensate Drain Lines & Drain Trap A condensing gas furnace achieves its high level of efficiency by extracting heat from the products of combustion to the point where condensation takes place. The condensate must be collected in the furnace drain trap and routed to an appropriate drain location in compliance with local and national codes. Follow the bullets listed below when installing the drain system.
OPERATION 115 VOLT LINE CONNECTIONS Before proceeding with electrical connections, ensure that the supply voltage, frequency, and phase correspond to that specified on the unit rating plate. Power supply to the furnace must be NEC Class 1, and must comply with all applicable codes. The furnace must be electrically grounded in accordance with local codes or, in their absence, with the latest edition of The National Electric Code, ANSI NFPA 70 and/or The Canadian Electric Code CSA C22.1.
OPERATION When installed with a non-communicating thermostat, the furnace integrated control module provides terminals for both “W1” and “W2”, and “Y1” and “Y2” thermostat connections. This allows the furnace to support the following system applications: ‘Two-Stage Heating Only’, ‘Two-Stage Heating with Single Stage Cooling’, and ‘Two-Stage Heating with Two-Stage Cooling’. Refer to the following figures for proper connections to the integrated control module.
OPERATION 1. Humidification Options are ON / OFF with the CTK03. When “On” is selected, the humidification relay on the furnace control board will function during a heat call if a humidity demand exists. Selecting “Off” means the humidification relay will not function. 2. If the CTK03 and CTK04 are set up so the compressor off delay is 0 min, it will display a cool / heat call immediately regardless of the delay built into the outdoor unit control board.
OPERATION All field wiring must conform to applicable codes. Connections should be made as shown in the following figure. CAUTION TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE , THE INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING. NEUTRAL Inlet gas supply pressures must be maintained within the ranges specified in the following table.
OPERATION Natural Gas Capacity of Pipe In Cubic Feet of Gas Per Hour (CFH) Length of Nominal Black Pipe Size Pipe in Feet 1/2" 3/4" 1" 1 1/4" 10 132 278 520 1050 20 92 190 350 730 30 73 152 285 590 40 63 130 245 500 50 56 115 215 440 60 50 105 195 400 70 46 96 180 370 80 43 90 170 350 90 40 84 160 320 100 38 79 150 305 (Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on 0.
OPERATION PROPANE GAS TANKS AND PIPING Sizing Between First and Second Stage Regulator* Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting. Capacities in 1,000 BTU/hour. WARNING IF THE GAS FURNACE IS INSTALLED IN A BASEMENT , AN EXCAVATED AREA OR CONFINED SPACE , IT IS STRONGLY RECOMMENDED TO Pipe or Tubing Length Feet 10 20 30 40 50 60 80 100 125 150 175 200 CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING DEVICE IN CASE OF A GAS LEAK.
OPERATION A closed return duct system must be used, with the return duct connected to the furnace. NOTE: Ductwork must never be attached to the back of the furnace. For upflow installations requiring 1800 CFM or more, use either two side returns or bottom return or a combination of side /bottom. Flexible joints may be used for supply and return connections to reduce noise transmission.
OPERATION AIR FLOW CUT USING TIN SNIPS CENTRAL RETURN GRILLE FILTER PRESS OUT BY HAND SIDE RETURN EXTERNAL FILTER RACK KIT (EITHER SIDE) FILTER CUT FOUR CORNERS AFTER REMOVING SHEET METAL SCRIBE LINES OUTLINING DUCT FLANGES Duct Flange Cut Outs FILTERS - READ THIS SECTION BEFORE INSTALLING THE RETURN AIR DUCT WORK Filters must be used with this furnace. Discuss filter maintenance with the building owner.
OPERATION Upon power up, all segments in the dual seven segment display will illuminate briefly and then display ON, indicating the furnace is standing by & ready to receive commands from the thermostat. Once a call for heat is received by the furnace control board, the furnace will enter a “calibration routine” The calibration routine allows the furnace to adapt to the installed venting and combustion air piping.
OPERATION 10 MINS. 90% 8 MINS. IGNITION (80%) Call for 2nd-Stage Heat satisfied; Call for 1st-Stage Heat remains. • The IFC remains at the current firing rate until the 1st-Stage call for heat is satisfied. HEATING OPERATION CATING) • 70% 60% • 50% 2 MINS. MIN. • • Operation with Conventional 2-Stage Thermostat (DIP switch selects 2-stage heat) Call for 2nd-Stage Heat - Thermostat contacts close R to W1 and W2.
OPERATION GAS SUPPLY PRESSURE MEASUREMENT 1. Turn OFF gas to furnace at the manual gas shutoff valve external to the furnace. CAUTION TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE , THE INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING. The line pressure supplied to the gas valve must be within the range specified below.
OPERATION FURNACE MANIFOLD PRESSURES Gas Line NATURAL GAS Gas Shutoff Valve Gas Line To Furnace Open To Atmosphere Drip Leg Cap With Fitting Manometer Hose Manometer Measuring Inlet Gas Pressure (Alt. Method) GAS MANIFOLD PRESSURE MEASUREMENT The manifold pressure must be measured with the burners operating. To measure the manifold pressure, use the following procedure. 1. Turn OFF gas to furnace at the manual gas shutoff valve external to the furnace. 2.
OPERATION 1. Turn OFF the gas supply to all other gas-burning appliances except the furnace. 2. While the furnace is operating, time and record one complete revolution of the smallest gas meter dial. 3. Calculate the number of seconds per cubic foot (sec/ ft3) of gas being delivered to the furnace. If the dial is a one cubic foot dial, divide the number of seconds recorded in step 2 by one. If the dial is a two cubic foot dial, divide the number of seconds recorded in step 2 by two. 4.
OPERATION 1. Determine the tonnage of the cooling system installed with the furnace. If the cooling capacity is in BTU/hr divide it by 12,000 to convert capacity to TONs. Example: • Profile A provides only an OFF delay of one (1) minute at 100% of the cooling demand airflow. Cooling Capacity of 30,000 BTU/hr. 30,000/12,000 = 2.5 Tons 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.
OPERATION In general lower heating speeds will: reduce electrical consumption, lower operating sound levels of the blower, and increase the outlet air temperature delivered to the home. The speeds available allow the blower performance to be optimized for the particular homeowner’s needs. DIP SWITCHES 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. The “ON” position is “UP’.
Pull Down Pull Up Bias Dehum Compressor T-Stat Heat Heat Off Delay Adjust Taps Cooling Ramping Continuous Fan Speed Tap Heating Speed Tap Cooling Speed Tap Purpose A B C D A B C D A B C D A B C D 0 Trim Adjust Plus 10% Minus 10% 0 Trim Adjust 90 Seconds 120 Seconds 150 Seconds 180 Seconds 1 Stage Stat 2 Stage Stat 1-Stage Compressor 2-Stage Compressor Disabled Enabled Disabled Enabled Disabled Enabled Disabled Enabled Function ------------------- ------------------- --- --- 2 OFF OFF
OPERATION In continuous fan mode, the CTK0* thermostat provides the airflow demand. The CTK02**, CTK03 and CTK04 thermostats may be configured for one of threecontinuous fan speed settings allow for 25%, 50% or 75% airflow, based on the furnaces’ maximum airflow capability. During continuous fan operation, the thermostat sends a fan request along with the continuous fan demand to the furnace. The furnace, in turn, sends the demand to the ECM motor.
OPERATION COOLING OPERATION WITH A COMMUNICATING THERMOSTAT CONVENTIONAL SINGLE STAGE A/C • • • • The call for cooling will be communicated via the ClimateTalk™ protocol. The Y1 terminal of the IFC becomes an output via the on board Y1 relay The IFC does not provide short cycle protection. The circulator operates as commanded by the communicating thermostat. COOLING OPERATION OUTDOOR UNIT • • COMMUNICATING THERMOSTAT WITH A AND The furnace receives the CFM demand from the communicating outdoor unit.
OPERATION Low Model Tap Stage High Stage Cool A *MVM970603BN* *MVM970803BN* *MVM970804CN* *MVM971005CN* *MVM971205DN* *CVM970603BN *CVM970803BN *CVM970804CN* *CVM971005CN* B C D A B C D A B C D A B C D A B C D A B C D A B C D A B C D A B C D Cool 100% Low heat Heat CFM for *CFM 2 stage 398 557 696 810 403 540 705 819 513 660 791 913 564 784 982 1259 547 831 1020 1278 433 541 686 806 599 817 1007 1212 629 806 1023 1230 789 967 1182 1375 820 1133 1464 1736 867 1160 1467 1910 656 790 972
OPERATION A 24 vac input may be applied to the G terminal of the modulating furnace control board to operate the indoor blower to support an HRV / ERV. The 24 vac source must originate from the R terminal of furnace. CTK0* Thermostat 1 2 R 1 2 R C G • • 4-Pin (X2), 7 pin, or 9 pin Connector C W1 W2 Y1 Y2 O The IFC then adds a predetermined amount of draft inducer RPM to both the recorded points.
OPERATION • • • • • • • • • • • • • • • Igniter Warm-up Time: The length of time allowed for the hot surface igniter to heat up prior to the initiation of gas flow. Pre-purge Time: The period of time intended to allow for the dissipation of any unburned gas or residual products of combustion at the beginning of a furnace operating cycle prior to initiating ignition. Beginning from the moment the pressure switch is sensed closed and lasting until the ignition source is energized.
OPERATION speed. Error code “E0” is flashed during the Soft Lockout period. The retry count is cleared if flame is sensed for longer than 10 seconds after exiting Trial for Ignition, or upon exit of Soft Lockout. Ignition Recycles: When flame is established during Trial for Ignition, and then lost: • The gas valve is de-energized. • The inducer moves to the ignition speed and holds for the Inter-purge Period.
OPERATION minutes, at which time the IFC de-energizes the inducer and then attempts the Calibration routine immediately. If during the 5 minute interval LPS is sensed closed or call for heat is removed, the IFC clears the error code and resumes normal operation. High Pressure Switch Operation • High Pressure Switch action is used to determine the inducer speed required to achieve the 100% firing rate of the appliance. The determination is made by the IFC during the calibration process.
SERVICE & OPERATION USING THE EMERSON® ULTRACHECK-EZ™ DIAGNOSTIC TOOL Green LED Orange Power Button Fi 4 Emerson® Ultracheck-EZ™ Diagnostic Tool • • • • • • 48 Turn off power to the furnace being serviced and verify with a volt meter Disconnect the 4 wire communication cable from the motor control unit (end bell) Connect the 4 wire connector of the diagnostic tool to the end bell communicating connector Attach one of the alligator clips of the diagnostic tool to the 24 volt hot terminal of the furnace
OPERATIONAL CHECKS LED Red Communications LED LED Status Indication Possible Causes Corrective Action(s) Off • Normal condition • None • None 2 Flashes • Out-of-box reset • Control power up • None • Learn button depressed Rapid Flashing On Solid • Normal network traffic • Control is “talking” on network as expected • Data 1/ Data 2 miss-wire • Data 1 and data 2 wires reversed • Check communications at furnace, thermostat or wiring (data 1/ data 2 communicating compatible wires).
OPERATIONAL CHECKS 5. If the furnace is installed as a one pipe system; make sure the surrounding area and structure are adequate to provide combustion air 6. Make sure there are no cabinet air leaks allowing supply air to affect combustion 7. If heat exchanger integrity is uncertain, follow procedures in Service Bulletin SF-041 MEMORY CHIPS Memory chips are a service only item and are not sent out with new equipment.
OPERATIONAL CHECKS Troubleshooting WARNING HIGH VOLTAGE ! TO AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER BEFORE PERFORMING ANY SERVICE OR MAINTENANCE. Refer to the Troubleshooting Codes for assistance in determining the source of unit operational problems. The dual 7-segment LED display will display an error code that may contain a letter and number. The error code may be used to assist in troubleshooting the unit.
MAINTENANCE Maintenance BURNERS WITH BARE FINGERS, ROUGH HANDLING OR VIBRATION Visually inspect the burner flames periodically during the heating season. Turn on the furnace at the thermostat and allow several minutes for flames to stabilize, since any dislodged dust will alter the flames normal appearance. Flames should be stable, quiet, soft, and blue (dust may cause orange tips but they must not be yellow). They should extend directly outward from the burners without curling, floating, or lifting off.
SERVICING SERVICING S-1 CHECKING VOLTAGE .................................... 54 S-305 CHECKING MAIN BURNERS ............................ 58 S-2 CHECKING WIRING ...................................... 54 S-306 CHECKING ORIFICES .................................... 58 S-3A THERMOSTAT AND WIRING ............................ 54 S-307 CHECKING GAS PRESSURE ............................. 58 S-3B HEATING ANTICIPATOR/ CYLCE RATE ................ 55 S-308 CHECKING HOT SURFACE IGNITOR ..................
SERVICING S-1 CHECKING VOLTAGE WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. 1. Remove the blower door to gain entry to the Junction Box. 2. Remove cover from the Junction Box and gain access to incoming power lines. With Power ON: WARNING LINE VOLTAGE NOW PRESENT 3. Using a voltmeter, measure the voltage across the hot and neutral connections.
SERVICING S-3B HEATING ANTICIPATOR/ CYLCE RATE S-300 CHECKING PRIMARY LIMIT CONTROL Older heating thermostats may have an adjustable anticipator. This is a wire wound adjustable heater which is energized during the "ON" cycle to help prevent overheating of the conditioned space. The anticipator is a part of the thermostat and if it should fail for any reason, the thermostat must be replaced. Other thermostats have a cycle rate adjustment to adjust cycles per hour. This should be set to match system type.
SERVICING S-303 INDUCED DRAFT BLOWER MOTOR AUXILIARY LIMIT CONTROL BLOWER HOUSING AUXILIARY LIMIT CONTROL Auxiliary Limit Control Location S-302 CHECKING FLAME ROLLOUT CONTROL A temperature activated manual reset control is mounted to the manifold assembly on modulating furnace, as shown in the following illustration.
SERVICING cuit to the gas valve. Follow this procedure to adjust the gas valve/manifold pressure if necessary. Before adjusting gas valve/manifold pressure, verify adequate gas supply pressure by measuring gas supply pressure during ignition. Gas supply pressure must be within the range shown in the Inlet Gas Supply Pressure chart. Do not attempt to adjust manifold gas pressure if supply pressure is outside the appropriate gas pressure range shown below. Inlet Gas Supply Pressure Natural Gas Minimum 4.
SERVICING S-305 CHECKING MAIN BURNERS The main burners are used to provide complete combustion of various fuels in a limited space, and transfer this heat of the burning process to the heat exchanger. Proper ignition, combustion, and extinction are primarily due to burner design, orifice sizing, gas pressure, primary and secondary air, vent and proper seating of burners. Depending on the size of the furnace, each furnace will have from three to six inshot burners.
SERVICING GAS LINE M anifold Gas Pressure GAS SHUTOFF VALVE GAS LINE TO FURNACE OPEN TO ATMOSPHERE DRIP LEG CAP WITH FITTING MANOMETER HOSE MANOMETER Measuring Inlet Gas Pressure (Alternate Method) 3. Turn ON the gas and electrical power supply and operate the furnace and all other gas consuming appliances on the same gas supply line. 4. Measure furnace gas supply pressure with burners firing. Supply pressure must be within the range specified in the following table.
SERVICING If switch reads as above proceed to Step 4, otherwise replace control. 4. Remove the pressure control hose from the control and interconnect with an inclined manometer as shown in the following figure.
SERVICING S-314 CHECKING FLAME SENSOR A flame sensing device is used in conjunction with the ignition control module to prove combustion. If proof of flame is not present the control will de-energize the gas valve and "retry" for ignition or lockout. WARNING 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. Flame signal is continuously monitored by the IFC.
SERVICING *MVM97 / *CVM97 Pressure Switch Trip Points And Usage Chart Coil Cover Model *MVM970603BNAA ID Blower Set Point on Max Make Pressure Low Fire Low Fire High Fire High Fire Low / High Pressure Fall Pressure On Switch Set Point on Max Make Set Point on Max Make Pressure Switch (PF) W.C. Rise W.C. Part # Pressure Fall Pressure On Pressure Fall Pressure On Assembly (PF) W.C. Rise W.C. (PF) W.C. Rise W.C. Part # - 0.17 ± .05 - 0.32 - 0.86 ± .05 - 1.
x Furnace fails to operate. x Integrated control module LED display provides E1 error code. x ComfortNet thermostat “Call for Service” icon illuminated. x ComfortNet thermostat scrolls “Check Furnace” message. x Induced draft blower runs continuously with no further furnace operation. x Integrated control module LED display provides E2 error code. x ComfortNet thermostat “Call for Service” icon illuminated. x ComfortNet thermostat scrolls “Check Furnace” message.
x Manual reset rollout switch is open x Open auxiliary input. x Open Fuse x Flame sense micro amp signal is low EF E5 E6 x No furnace operation. x Integrated control module LED display provides Ef error code. x No furnace operation. x Integrated control module LED display provides E5 error code. x ComfortNet thermostat displays “Battery Power”. x Normal furnace operation. x Integrated control module LED display provides E6 error code. x Inducer motor overcurrent fault.
EA d0 REVERSED PLTY NO NET DATA x Polarity of 115 volt AC is reversed x Data not yet on network. EA d0 E9 x Furnace fails to operate. x Integrated control module LED display provides EA error code. x ComfortNet thermostat “Call for Service” icon illuminated. x ComfortNet thermostat scrolls “Check Furnace” message. x Furnace fails to operate. x Integrated control module LED display provides d0 error code. x ComfortNet thermostat “Call for Service” icon illuminated.
b0 b1 b2 b3 x Furnace fails to operate. x Integrated control module LED display provides b1 error code. x ComfortNet thermostat “Call for Service” icon illuminated. x ComfortNet thermostat scrolls “Check Furnace” message. x Furnace fails to operate. x Integrated control module LED display provides b2 error code. x ComfortNet thermostat “Call for Service” icon illuminated. x ComfortNet thermostat scrolls “Check Furnace” message. x Furnace operates at reduced performance.
x Furnace fails to operate. x Integrated control module LED display provides b7 error code. x ComfortNet thermostat “Call for Service” icon illuminated. x ComfortNet thermostat scrolls “Check Furnace” message. x Furnace operates at reduced performance. x Integrated control module LED display provides b9 error code. x Furnace fails to operate. x Integrated control module LED display provides b5 error code. x ComfortNet thermostat “Call for Service” icon illuminated.
Status Codes NO POWER On NORMAL OPERATION A b0 b1 INDICATES AIRFLOW, FOLLOWED BY CFM b2 b3 BLOWER HP MIS-MATCH b4 b5 BLOWER MOTOR CURRENT TRIP OR LOST ROTOR b6 b7 BLOWER OVER/UNDER VOLTAGE TRIP OR OVER TEMPERATURE TRIP b9 LOW INDOOR AIRFLOW C CLIMATETALK COMPRESSOR COOLING / CONVENTIONAL COMPRESSOR COOLING WHEN 1-STAGE COMPRESSOR IS SET UP C1 C2 68 BLOWER MOTOR NOT RUNNING BLOWER COMMUNICATION ERROR BLOWER MOTOR OPERATING IN POWER, TEMPERATURE, OR SPEED LIMIT BLOWER MOTOR LOCKED ROTOR IN
Wiring Diagram *MVM97_A*, *CVM97_A* GND GR ID BLOWER MODULATING PRESSURE SWITCH ASSEMBLY GND HIGH FIRE PRESSURE SWITCH OR LOW FIRE PRESSURE C C SWITCH NO NO RD MODULATING WH GND L WH GAS VALVE N WARNING: BR (HONEY WELL) FLAME SENSOR C GY 1 WARNING:DISCONNECT POWER BEFORE SERVICING WIRING. TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED.
