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Pride and workmanship go into every product to provide
our customers with quality products. It is possible, however,
that during its lifetime a product may require service.
Products should be serviced only by a qualified service
technician who is familiar with the safety procedures
required in the repair and who is equipped with the proper
tools, parts, testing instruments and the appropriate service
manual. REVIEW ALL SERVICE INFORMATION IN THE
APPROPRIATE SERVICE MANUAL BEFORE
BEGINNING REPAIRS.
Only personnel that have been trained to install, adjust,
service or repair(hereinafter, "service") the equipment
specified in this manual should service the equipment. The
manufacturer will not be responsible for any injury or
property damage arising from improper service or service
procedures. If you service this unit, you assume responsi-
bility for any injury or property damage which may re-
sult. In addition, in jurisdictions that require one or more
licenses to service the equipment specified in this manual,
only licensed personnel should service the equipment.
Improper installation, adjustment, servicing or repair of
the equipment specified in this manual, or attempting to
install, adjust, service or repair the equipment specified in
this manual without proper training may result in product
damage, property damage, personal injury or death.
Service Instructions
Daikin DM80TN/DC80TN
Two Stage Furnace with nine speed ECM Motor
WARNING
Copyright © 2021
TABLE OF CONTENTS
Important Information .................................. 2
Product Identification .................................. 5
System Operation ........................................... 6
Scheduled Maintenance .............................. 26
Servicing Table of Contents ..................... 29
Servicing ........................................................ 30
Troubleshooting Chart .............................. 41
Wiring Diagrams ........................................... 43
RSD6621009
May 2021
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Summary of Contents for Daikin DM80TN
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Page 1: Table Of Contents
Service Instructions Daikin DM80TN/DC80TN Two Stage Furnace with nine speed ECM Motor TABLE OF CONTENTS Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime a product may require service. -
Page 2: Important Information
IMPORTANT INFORMATION AVERTISSEMENT IMPORTANT NOTICES FOR CONSUMERS RISQUE D'ÉLECTROCUTION, D'INCENDIE OU D'EXPLOSION AND SERVICERS Si les consignes de sécurité ne sont pas suivies à la RECOGNIZE SAFETY SYMBOLS, WORDS AND lettre, cela peut entraîner la mort, de graves blessures, un LABELS fonctionnement dangereux ou des dommages matériels. - Page 3 IMPORTANT INFORMATION FOR YOUR SAFETY READ BEFORE OPERATING WARNING : Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to the user’s information WARNING : If you do not follow these instructions manual provided with this furnace. For assistance exactly, a fire or explosion may result causing property or additional information consult a qualified damage, personal injury or loss of life.
- Page 4 IMPORTANT INFORMATION RISQUE D'EMPOISONNEMENT AU MONOXYDE DE CARBONE 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 au CO pouvant survenir si un appareil produisant du monoxyde del aparato cuando se opera en cualquier modo.
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Page 5: Product Identification
NOMENCLATURE 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. Daikin Furnace Nomenclature (14 Digits) Brand Minor Revision D - Daikin... -
Page 6: System Operation
SYSTEM OPERATION latest edition of The National Electric Code, ANSI NFPA 70 WARNING and/or The Canadian Electric Code CSA C22.1. An electrical disconnect must be provided at the furnace F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A location. - Page 7 SYSTEM OPERATION The integrated control module electronic air cleaner terminals the control board. When a single stage heating thermostat is (EAC) are energized with 115 volts whenever the circulator used there are two options for controlling the timed transition blower is energized. from low to high fire: 1) Auto 2) Fixed Time.
- Page 8 SYSTEM OPERATION Twinning and EAC H. The humidifier and electronic air cleaner neutral terminals are identified as NEUTRAL. All field wiring must Two furnaces of the same model may be twinned. The in- conform to applicable codes. Connections should be made tegrated control board has a 3/16”...
- Page 9 SYSTEM OPERATION • When the thermostat is satisfied: • The gas valve is de-energized. • The inducer remains energized for the post purge period (15 seconds). • The indoor blower runs for the selected off delay period 24V HUM (90 seconds by default, adjustable from 30 – 180 Terminal is seconds).
- Page 10 SYSTEM OPERATION The control will rotate available speed number every time Cooling Mode Speed Selection left/right switches are pressed. All 9 speeds are available To change the main blower speed in COOLING mode, follow for circulation. the following steps: When the center switch is pressed, the current displayed Press the left or right switch until LED displays “AC1 speed will be selected, and control will immediately apply “(for single stage COOLING) or “AC2 “(for two-stage...
- Page 11 SYSTEM OPERATION must supply a means of filtering all of the return air. Filter(s) A return air filter is not supplied with the furnace. The installer shall comply with UL900 or CAN/ULC-S111 Standards. If must supply a means of filtering all of the return air. Filter(s) the furnace is installed without filters, and is not covered by shall comply with UL900 or CAN/ULC-S111 Standards.
- Page 12 SYSTEM OPERATION Airflow Tables DM80TN LOW STAGE COOLING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1130 1090 1059 1022 F04^ DM80TN0403A* Y/Y1 1158 1113 1090 1057 1024 1270 1235 1208 1179 1147 1119 1088 1060...
- Page 13 SYSTEM OPERATION Airflow Tables DM80TN LOW STAGE COOLING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1420 1359 1301 1254 1206 1152 1100 1044 1825 1769 1718 1673 1629 1584 1540 1497 F04^ 1623 1567 1516...
- Page 14 SYSTEM OPERATION Airflow Tables DM80TN HIGH STAGE COOLING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1130 1090 1059 1022 DM80TN0403A* F05^ 1158 1113 1090 1057 1024 1270 1235 1208 1179 1147 1119 1088 1060 1330...
- Page 15 SYSTEM OPERATION Airflow Tables DM80TN HIGH STAGE COOLING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1420 1359 1301 1254 1206 1152 1100 1044 1825 1769 1718 1673 1629 1584 1540 1497 1623 1567 1516 1468...
- Page 16 SYSTEM OPERATION Airflow Tables DM80TN CIRCULATION AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1130 1090 1059 1022 DM80TN0403A* 1158 1113 1090 1057 1024 1270 1235 1208 1179 1147 1119 1088 1060 1330 1295 1273 1251...
- Page 17 SYSTEM OPERATION Airflow Tables DM80TN CIRCULATION AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1420 1359 1301 1254 1206 1152 1100 1044 1825 1769 1718 1673 1629 1584 1540 1497 1623 1567 1516 1468 1423 1374...
- Page 18 SYSTEM OPERATION Airflow Tables DM80TN HEATING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # TEMP RANGE CALL RISE RISE RISE RISE RISE F01^ W/W1 F03^^ DM80TN0403A* 15 - 45 F02^ 1130 1090 1059 1022 1158 1113 1090...
- Page 19 SYSTEM OPERATION Airflow Tables DC80TN LOW STAGE COOLING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1120 1081 1053 1022 F04^ DC80TN0403A* Y/Y1 1000 1212 1198 1161 1138 1103 1076 1037 1007 1362 1342 1307 1273 1252 1237 1211...
- Page 20 SYSTEM OPERATION Airflow Tables DC80TN HIGH STAGE COOLING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1120 1081 1053 1022 DC80TN0403A* F05^ 1000 1212 1198 1161 1138 1103 1076 1037 1007 1362 1342 1307 1273 1252 1237 1211 1185...
- Page 21 SYSTEM OPERATION Airflow Tables DC80TN CIRCULATION AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1120 1081 1053 1022 DC80TN0403A* 1000 1212 1198 1161 1138 1103 1076 1037 1007 1362 1342 1307 1273 1252 1237 1211 1185 1426 1405 1380...
- Page 22 SYSTEM OPERATION Airflow Tables DC80TN HEATING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # TEMP RANGE CALL RISE RISE RISE F01^ W/W1 F03^^ DC80TN0403A* 15 - 45 F02^ 1120 1081 1053 1000 F01^ W/W1 F03^^ DC80TN0603A* 30 - 60 F02^ 1035 F04^^...
- Page 23 SYSTEM OPERATION Airflow Tables DC80TN HEATING AIFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # TEMP RANGE CALL RISE RISE F01^ W/W1 F03^^ DC80TN0403A* 15 - 45 F02^ 1022 F01^ W/W1 F03^^ DC80TN0603A* 30 - 60 F02^ F04^^ 1039 1006 F01^...
- Page 24 SYSTEM OPERATION 2 Stage Status Codes LED Display Menu Description Notes Main Menu Option Menu ( xx: code numbers ) xx Active Alarm menu xx ( xx: code numbers ) Last 6 Faults ...
- Page 25 SYSTEM OPERATION 2 Stage Status Codes Status Menu Main Mode Menu Idle Continous Fan Compressor Cooling, Low Stage Compressor Cooling, High Stage ...
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Page 26: Scheduled Maintenance
SCHEDULED MAINTENANCE Upflow Models Minimum Recommended Filter Size *0403A* 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return *0603A* 1 - 16 X 25 Side or 14 X 24 Bottom Return *0603B* 1 - 16 X 25 Side or Bottom Return *0803B* 1 - 16 X 25 Side or Bottom Return *0804B*... - Page 27 SCHEDULED MAINTENANCE CLOCKING A GAS METER 1. Turn off all gas appliances in the home. 2. Turn on the furnace. Ensure the furnace is operating at a 100% firing rate on 2 stage and modulating furnace product. 3. Once heating cycle is at a steady state (typically 15 minutes of operation), use a stopwatch to time how long it takes the smallest unit of measure dial on the gas meter to make a full revolution.
- Page 28 SCHEDULED MAINTENANCE 5. Use this formula to verify the Cubic Feet per Hour (CFH) input determined in step 4 is correct: (3600 x Gas Meter Dial Size) / Time (seconds) = Cubic Feet per Hour (CFH) 3600 is used as there are 60 seconds in a minute and 60 minutes in an hour.
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Page 29: Servicing Table Of Contents
SERVICING Servicing Table of Contents S-1 Checking Voltage ........31 S-304 Checking Gas Valve (Redundant) ..36 S-2 Checking Wiring ........31 S-305 Checking Main Burners ....36 S-3A Checking Thermostat And Wiring ..31 S-306 Checking Orifices ......36 S-4 Checking Transformer And Control S-307 Checking Gas Pressure .... -
Page 30: Servicing
SERVICING As more and more electronic's are introduced to the Heating INCOMING POWER Trade, Polarization of incoming power and phasing of pri- mary to secondary voltage on transformers becomes more 120.00 0.00 important. Polarization has been apparent in the Appliance industry since the introduction of the three prong plug, however, the Heating Industry does not use a plug for incoming power, but is hard wired. -
Page 31: S-1 Checking Voltage
SERVICING S-1 Checking Voltage S-3A Checking Thermostat And Wiring WARNING WARNING HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING. ISCONNECT POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING. ULTIPLE POWER 1. Remove the blower compartment door to gain access to SOURCES MAY BE PRESENT. AILURE TO DO SO MAY CAUSE the thermostat low voltage wires located at the furnace PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. -
Page 32: Checking Air Circulator Blower Motor (Multi-Speed Ecm Motor)
SERVICING 2. Remove the thermostat low voltage wires at the furnace Red wire connected to the COM terminal, which is a integrated control module terminals. female spade connection next to the T1 – T5 wires on the control board. With Power On (and Door Interlock Switch closed): Green ground wire connected to cabinet ground WARNING The control harness has:... -
Page 33: S-201 Checking Temperature Rise
SERVICING SUPPLY . RETURN Checking Static Pressure Checking Temperature Rise S-201 Checking Temperature Rise 3. Subtract the return air temperature from the supply air The more air (CFM) being delivered through a given furnace, temperature to determine the air temperature rise. Allow the less the rise will be;... -
Page 34: S-301 Checking Auxiliary Limit Control
SERVICING The following drawing illustrates the style of limit switches In an open limit condition the red LED will flash as described used on the 90% furnaces. above but the error code will not be stored in memory until the limit resets or until 15 minutes has elapsed. So if the limit resets in less than 5 minutes a four flash code will be stored. -
Page 35: S-302 Checking Flame Rollout Control
SERVICING AUXILIARY LIMIT CONTROL LIMIT BLOWER HOUSING S-302 Checking Flame Rollout Control A temperature activated manual reset control is mounted to the manifold assembly as shown in the following illustration AUXILIARY LIMIT CONTROL Auxiliary Limit Control Location WARNING HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING OR INSTALLING THIS UNIT. -
Page 36: S-303 Induced Draft Blower Motor
Two stage gas valves always require 24 volts between S-306 Checking Orifices common and low fire (main coil) to open. Also, the furnace DC80TN/DM80TN model furnaces have factory installed #45 front cover pressure switch is wired in series with the low natural gas orifices. -
Page 37: S-307 Checking Gas Pressure
SERVICING Orifices should be treated with care in order to prevent damage. They should be removed and installed with a box- end wrench in order to prevent distortion. In no instance should an orifice be peened over and redrilled. This will High Fire Regulator Adjust change the angle or deflection of the vacuum effect or... - Page 38 SERVICING 11. Turn off all electrical power and gas supply to the sys- tem. 12. Remove the manometer hose from the hose barb fitting or outlet pressure tap. 13. Replace outlet pressure tap: White-Rodgers 36J54 valve: Turn outlet pressure test screw in to seal pressure port (clockwise, 7 in-lb mini- mum).
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Page 39: S-308 Checking Hot Surface Ignitor
SERVICING 2. Turn on gas to furnace and check for leaks. If leaks are Since the end results of flashback and delayed ignition can found, repair and then reinstall burner compartment door. be the same (burning in the burner venturi) a definite attempt should be made to determine which has occurred. -
Page 40: S-311 High Altitude Application (Usa)
SERVICING S-311 High Altitude Application (USA) WARNING The furnace as shipped requires no change to run between 0 - 7500 feet. Do not attempt to increase the firing rate by changing orifices or increasing the manifold pressure INE VOLTAGE NOW PRESENT below 7500 feet. -
Page 41: Troubleshooting Chart
TROUBLESHOOTING 2 Stage Troubleshooting Codes TROUBLESHOOTING CHART Symptom LED Status Fault Description Corrective Actions Normal operation Normal operation None Locate and correct gas interruption Replace or realign igniter Furnace lockout due to an excessive number Check flame sense signal, clean sensor if coated or of ignition “retries”... - Page 42 TROUBLESHOOTING 2 Stage Troubleshooting Codes TROUBLESHOOTING CHART Symptom LED Status Fault Description Corrective Actions Flame sense micro amp signal is minimal Clean flame sensor if coated or oxidized Inspect for Flame sensor is coated/oxidized proper flame sensor alignment Normal furnace operation ...
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Page 43: Wiring Diagrams
DC80TN/DM80TN WIRING DIAGRAMS (with PCBBF161 Control Board) POWER BEFORE PROPERLY POLARIZED 40 VA TRANSFORMER TH (3) RLI (12) HLO (1) PS1(5) READ CODES FROM LEFT TO RIGHT HLI (8) MVL (10) MVH (4) MVC (11) TR (7) W/W1 R Y/Y1... - Page 44 CUSTOMER FEEDBACK Daikin is very interested in all product comments. Please fill out the feedback form on the following link: https://daikincomfort.com/contact-us You can also scan the QR code on the right to be directed to the feedback page. Copyright © 2021...