Table of Contents
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WARNING
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.
Copyright © 2021
Service Instructions
Daikin 80% Single Stage Gas Furnaces
DM80SN, DC80SN
& Accessories
This manual is to be used by qualified, professionally trained
HVAC technicians only.
Daikin does not assume any responsibility for property dam-
age or personal injury due to improper service procedures or
services performed by an unqualified person.
The material in this manual does not supersede manufactur-
ers installation and operation instructions.
RSD6621010
July 2021
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Summary of Contents for Daikin DM80SN
- Page 1 Only personnel that have been trained to install, adjust, service or repair(hereinafter, “service”) the equipment Daikin does not assume any responsibility for property dam- specified in this manual should service the equipment. The age or personal injury due to improper service procedures or manufacturer will not be responsible for any injury or services performed by an unqualified person.
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Page 2: Table Of Contents
Table of Contents IMPORTANT INFORMATION ........2 - 4 AIRFLOW TABLES ............ 31 - 38 PRODUCT IDENTIFICATION ..........5 1 STAGE STATUS CODES ........39 - 40 OPERATING INSTRUCTIONS ..........6 1 STAGE TROUBLESHOOTING CODES ....41 - 42 POLARIZATION and PHASING ........13 WIRING DIAGRAM ........... -
Page 3: 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- DAIKIN PRODUCTS TOLL FREE 1-877-254-4729 (U.S. only) email us at: customerservice@daikincomfort.com... - Page 4 IMPORTANT INFORMATION 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 CO can cause serious illness including permanent brain damage or death.
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Page 5: 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. Brand Minor Revision D - Daikin A - Initial Release B - 1st Revision Configuration... -
Page 6: Operating Instructions
OPERATING INSTRUCTIONS 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 7 Safety Daikin 80% furnaces are ETL certified appliances and are Please adhere to the following warnings and cautions when in- appropriate for use with natural or propane gas. (NOTE: If stalling, adjusting, altering, servicing, or operating the furnace. using propane gas, a propane conversion kit is required).
- Page 8 Propane Gas and/or High Altitude Installations INLET GAS SUPPLY PRESSURE Minimum: 4.5" w.c. Maximum: 10.0" w.c. Natural Gas WARNING Minimum: 11.0" w.c. Maximum: 13.0" w.c. Propane Gas Possible property damage, personal injury or death may occur if the correct conversion kits are not installed. The Gas Valve appropriate kits must be applied tot ensure safe and proper This unit is equipped with a 24 volt gas valve controlled...
- Page 9 Twinning Low voltage connections can be made through either the right or left side panel. Thermostat wiring entrance holes Two furnaces of the same model may be twinned. The in- are located in the blower compartment. The following figure tegrated control board has a 3/16” terminal labeled “TWIN” shows connections for a “heat/cool system”.
- Page 10 If it is necessary for the installer to supply additional line voltage wiring to the inside of the furnace, the wiring must conform to all local codes, and have a minimum temperature rating of 105°C. All line voltage wire splices must be made inside the furnace junction box.
- Page 11 Gas Heat Sequence of Operation Call for Heat THERMOSTAT CALL AVAILABLE SPEEDS • On a call for heat, the thermostat contacts close & the control board receives 24 VAC on the W terminal. • The control board microcomputer runs its self-check W/W1 F02 (DEFAULT) routine.
- Page 12 DM80SN Models “(for single stage COOLING) or “AC2 “(for two-stage DM80SN furnaces require installer provision of a return air filter located on the side or bottom of the furnace or a cen- COOLING). Press the center switch and LED will dis- play the selected speed number as Fxx (xx: Blower trally located filter.
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Page 13: Polarization And Phasing
POLARIZATION AND PHASING As more and more electronics are introduced to the Heating INCOMING POWER Trade, Polarization of incoming power and phasing of pri- METER READS METER READS 120 VOLTS 0 VOLTS mary to secondary voltage on transformers becomes more important. -
Page 14: Maintenance
MAINTENANCE Induced Draft and Circulation Blowers The bearings in the induced draft blower and circulator blow- CAUTION er motors are permanently lubricated by the manufacturer. No further lubrication is required. Check motor windings for If you must handle the ignitor, handle with care. Touching the ignitor body with bare fingers, rough handling, or accumulation of dust which may cause overheating. - Page 15 MAINTENANCE Heating Performance Test Before attempting to diagnose an operating fault, run a heat- CAUTION ing performance test and apply the results to the Service Always connect a manometer to the outlet tap at the gas Problem Analysis Guide. valve before adjusting the pressure regulator. In no case should the final manifold pressure vary more than plus or To conduct a heating performance test, the BTU input to the minus .3 inches water column from 3.5 inches water column...
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Page 16: Servicing
SERVICING CUBIC FEET GAS RATE -- CUBIC FEET PER HOUR Size of Test Dial Size of Test Dial Seconds for Seconds for cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft Revolution Revolution 1800 1636 1500 1385 1286 1200 1125 1059 1000... -
Page 17: Servicing Table Of Contents
SERVICING SERVICE NUMBERS CHECKING VOLTAGE ............................18 CHECKING WIRING .............................. 18 S-3A THERMOSTAT AND WIRING ..........................18 S-3B HEATING ANTICIPATOR ............................18 CHECKING TRANSFORMER AND CONTROL CIRCUIT ..................19 S-16 CHECKING AIR CIRCULATOR BLOWER MOTOR ..................19 S-200 CHECKING DUCT STATIC ............................ 20 S-201 CHECKING TEMPERATURE RISE ........................ -
Page 18: Checking Voltage
SERVICING CHECKING VOLTAGE CHECKING THERMOSTAT, WIRING AND ANTICIPATOR WARNING S-3A THERMOSTAT AND WIRING HIGH VOLTAGE Disconnect ALL power before servicing or in- stalling this unit. Multiple power sources may WARNING be present. Failure to do so may cause proper- ty damage, personal injury or death. Disconnect ALL power before servicing. -
Page 19: Checking Transformer And Control Circuit
SERVICING S-16 CHECKING AIR CIRCULATOR The heating anticipator setting for furnaces covered in this BLOWER MOTOR (MULTI-SPEED ECM) manual is 0.70 Amps. Cooling Anticipator The cooling anticipator is a small heater (resistor) in the ther- WARNING mostat. During the “OFF” cycle it heats the bimetal element helping the thermostat call for the next cooling cycle. -
Page 20: S-200 Checking Duct Static
SERVICING SUPPLY WARNING Disconnect ALL power before servicing. CUTAWAY OF DUCTWORK TO EXPOSE COIL S-200 CHECKING DUCT STATIC The maximum and minimum allowable external static pres- INCLINED sures are found in the specification section. These tables MANOMETER also show the amount of air being delivered at a given static by a given motor speed or pulley adjustment. -
Page 21: S-300 Checking Primary Limit Control
SERVICING SUPPLY Location of Primary Limit RETURN Checking Temperature Rise 3. Subtract the return air temperature from the supply Primary Limit Control Location air temperature to determine the air temperature rise. (80% Upflow Furnace Shown, Counterflow Similar) Allow adequate time for thermometer readings to stabilize. -
Page 22: S-301 Checking Auxiliary Limit Control
SERVICING VOLT / OHM METER RESET BUTTON Testing Primary Limit Control COLOR IDENTIFYING S-301 CHECKING AUXILIARY Testing Auxiliary Limit Control LIMIT CONTROL WARNING To avoid possible fire, only reset the auxiliary limit control once. If it should open a second time, a qualified servicer must determine why the auxiliary limit opened before resetting again. -
Page 23: S-303 Induced Draft Blower Motor
SERVICING S-303 INDUCED DRAFT BLOWER MOTOR The control is designed to open should a flame roll out oc- cur. An over firing condition or flame impingement on the heat shield may also cause the control to open. If the rollout WARNING control opens, the air circulation blower will run continuously. -
Page 24: S-305 Checking Main Burners
SERVICING S-305 CHECKING MAIN BURNERS WARNING The main burners are used to provide complete combustion Disconnect ALL Gas and Electric Power Supply. of various fuels in a limited space, and transfer this heat of the burning process to the heat exchanger. 1. - Page 25 SERVICING WARNING WARNING HIGH VOLTAGE Disconnect ALL Gas and Electric Power Supply. Disconnect ALL power before servicing or in- 1. After turning off gas to furnace at the manual gas stalling this unit. Multiple power sources may be present. Failure to do so may cause proper- shutoff valve external to the furnace, remove burner ty damage, personal injury or death.
- Page 26 SERVICING g. Turn off all electrical power and gas supply to the 3. Turn ON the gas and electrical power supply and operate the furnace. system. 4. Measure gas manifold pressure with burners firing. h. Remove the manometer hose from the hose barb Adjust manifold pressure using the table below.
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Page 27: S-308 Checking Hot Surface Ignitor
SERVICING S-309 CHECKING FOR FLASHBACK WARNING Flashback will also cause burning in the burner venturi, but HIGH VOLTAGE is caused by the burning speed being greater than the gas- Disconnect ALL electrical power and shut off gas supply air flow velocity coming from a burner port. before servicing or installing. -
Page 28: S-311 High Altitude Application (Usa)
SERVICING In some areas the gas supplier may artificially derate the Induced Draft Blower Pressure Switch gas in an effort to compensate for the effects of altitude. If Pressure Switch the gas is artificially derated the appropriate orifice size must Hose be determined based on the BTU/ft3 content of the derated gas and the altitude. -
Page 29: S-314 Checking Flame Sensor
SERVICING Flame Sensor WARNING Line Voltage now present. 1. Check for 120 volts from Line 1 (Hot) to Line 2 (Neu- tral) at the ignition control. No voltage, check the door switch connections and wire harness for continuity. 2. Check for 24 volts from W to C terminal on the ignition control. - Page 30 SERVICING DM80SN / DC80SN Pressure Switch Trip Points And Usage Chart ID BLOWER Set Point on Max Make MODEL Pressure Pressure Fall (PF) Pressure On Rise Switch Part# W.C. W.C. DM80SN0403A* -0.70 ±0.06 -0.85 0130F00505 DM80SN0603A* -0.75 ±0.07 -0.90 0130F00506 DM80SN0604B* -0.75 ±0.07...
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Page 31: Airflow Tables
DM80SN AIRFLOW TABLES LOW STAGE COOLING AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL F04^ DM80SN0403A* Y/Y1 1330 1295 1273 1251 1223 1195 1168 1142 1130 1090 1059 1022 1158 1113 1090 1057 1024 1270 1235... - Page 32 DM80SN AIRFLOW TABLES HIGH STAGE COOLING AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL DM80SN0403A* F05^ 1330 1295 1273 1251 1223 1195 1168 1142 1130 1090 1059 1022 1158 1113 1090 1057 1024 1270 1235 1208...
- Page 33 DM80SN AIRFLOW TABLES CIRCULATION AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL DM80SN0403A* 1330 1295 1273 1251 1223 1195 1168 1142 1130 1090 1059 1022 1158 1113 1090 1057 1024 1270 1235 1208 1179 1147 1119...
- Page 34 DM80SN AIRFLOW TABLES HEATING AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # TEMP RANGE CALL RISE RISE RISE RISE RISE F01^^ F02^ DM80SN0403A* W/W1 25-55 F01^^ F02^ 1268 1221 1188 1154 1122 1091 1060 1029 DM80SN0603A* W/W1...
- Page 35 DC80SN AIRFLOW TABLES LOW STAGE COOLING AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1120 1081 1053 1022 F04^ 1073 1031 1003 DC80SN0403AX Y/Y1 1212 1198 1161 1138 1103 1076 1037 1007 1274 1252 1220 1195 1169 1145 1110...
- Page 36 DC80SN AIRFLOW TABLES HIGH STAGE COOLING AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1120 1081 1053 1022 1073 1031 1003 F05^ DC80SN0403AX 1212 1198 1161 1138 1103 1076 1037 1007 1274 1252 1220 1195 1169 1145 1110 1084...
- Page 37 DC80SN AIRFLOW TABLES CIRCULATION AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # CALL 1120 1081 1053 1022 1073 1031 1003 DC80SN0403AX 1212 1198 1161 1138 1103 1076 1037 1007 1274 1252 1220 1195 1169 1145 1110 1084 1362 1342 1307...
- Page 38 DC80SN AIRFLOW TABLES HEATING AIRFLOW EXTERNAL STATIC PRESSURE, (INCHES WATER COLUMN) THERMOSTAT MODEL TAP # TEMP RANGE CALL RISE RISE RISE RISE RISE F01^^ F02^ 1120 1081 1053 1022 DC80SN0403AX W/W1 25-55 1073 1031 1003 F01^^ F02^ 1035 DC80SN0603AX W/W1 30-60 F04^^ F01^^...
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Page 39: Stage Status Codes
1 STAGE STATUS CODES LED Display Menu Description Notes Main Option Menu Menu ( xx: code numbers ) Active Alarm menu xx ( xx: code numbers ) Last 6 Faults F xx Code Release Number CR Number Reset to Factory Default ... - Page 40 STATUS MENU 1 STAGE STATUS CODES Main Mode Menu Idle Continous Fan F Compressor Cooling, Low Stage Compressor Cooling, High Stage Gas heat - Single Stage Control OEM test Mode ...
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Page 41: Stage Troubleshooting Codes
1 STAGE TROUBLESHOOTING CODES TROUBLESHOOTING CHART Symptom Fault Description Corrective Actions Status 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 1 STAGE TROUBLESHOOTING CODES TROUBLESHOOTING CHART Symptom Fault Description Corrective Actions Status Flame sense micro amp signal is minimal Clean flame sensor if coated or oxidized Inspect for proper Flame sensor is coated/oxidized flame sensor alignment Flame sensor incorrectly positioned in burner Normal furnace operation ...
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Page 43: Wiring Diagram
WIRING DIAGRAM POWER BEFORE PROPERLY POLARIZED 40 VA TRANSFORMER TH (3) RLI (12) HLO (1) PS1(5) READ CODES FROM LEFT TO RIGHT HLI (8) MV (10) MVC (11) TR (7) W/W1 R Y/Y1 Y2 ECM MTR INDOOR HARNESS CIRCULATOR MICRO BLWR INTERGRATED CONTROL MODULE NOTES:... - 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...