Daikin DC80SN Service Instructions Manual Download

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Service Instructions

RSD6621010

July 2021

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.

WARNING

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.

Summary of Contents for DC80SN

Page 1: ...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 WARNING Daikin 80 Single Stage Gas Furnaces DM80SN DC80SN Acce...

Page 2: ...REVIEW ALL SERVICE INFORMATION IN THE APPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS IMPORTANT NOTICES RECOGNIZE SAFETY SYMBOLS WORDS AND LABELS WARNING This unit should not be connected to or used in conjunction with any devices that are not design certified for use with this unit or have not been tested and approved by the manufacturer Serious property damage or personal injury reduced unit...

Page 3: ... Installation and service must be performed by a qualified installer service agency or the gas supplier IMPORTANT INFORMATION 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 To locate an authorized servicer please consult your telephone book or the dealer from whom you purchas...

Page 4: ...n circular a través del aparato cuando se opera en cualquier modo B10259 216 CO can cause serious illness including permanent brain damage or death B10259 216 RISQUE D EMPOISONNEMENT AU MONOXYDE DE CARBONE Le monoxyde de carbone peut causer des maladies graves telles que des dommages permanents au cerveau et meme la mort Cette ventilation est nécessaire pour éviter le danger d intoxication au CO p...

Page 5: ...nitial Release B 1st Revision Configuration M Upflow Horizontal Major Revision C Downflow Horizontal A Initial Release B 1st Revision Nox AFUE 80 80 AFUE 92 92 AFUE 96 96 AFUE 97 97 AFUE Cabinet Width A 14 Gas Valve B 17 5 T 2 Stage C 21 S 1 STAGE D 24 5 MOTOR Maximum CFM N Nine Speed ECM 3 1200 CFM 4 1600 CFM 5 2000 CFM MBTU h 030 30 000 BTU h 080 80 000 BTU h 040 40 000 BTU h 100 100 000 BTU h 0...

Page 6: ...n cause death or serious illness and which are known to the state of California to cause cancer birth defects or other reproductive harm This product contains fiberglass insulation Fiberglass insulation contains a chemical known by the state of California to cause cancer No almacene ni use gasolina u otros vapores y líquidos inflamables cerca de este o cualquier otro aparato PARA SU SEGURIDAD ADVE...

Page 7: ...ngrounded object Product Application This product is designed for use as a residential home gas furnace It is not designed or certified for use in mobile home trailer or recreational vehicle applications This furnace can be used in the following non industrial com mercial applications Schools Office buildings Church es Retail stores Nursing homes Hotels motels Com mon or office areas In such appli...

Page 8: ...rating Inlet gas supply pressures must be maintained within the ranges specified below The supply pressure must be con stant and available with all other household gas fired appli ances operating The minimum gas supply pressure must be maintained to prevent unreliable ignition The maximum must not be exceeded to prevent unit overfiring Natural Gas Minimum 4 5 w c Maximum 10 0 w c Propane Gas Minim...

Page 9: ...ated beside the low voltage thermostat connection strip Twinning allows simultaneous operation of two furnaces and forces the indoor blower motors of each furnace to oper ate synchronously into a common duct system Using the twinning function will require only field installed wiring with no external kits or parts The staging and speed tap options must be set the same on both furnaces NOTE Each fur...

Page 10: ...his is a 24 volt circuit only the common con nection must be on C terminal of the low voltage terminal strip where thermostat wires are con nected Wiring for this circuit must NOT be con nected to the line N location where line voltage neutral wires are connected 24 VOLT HUM HUMIDISTAT W R G C Y 24V HUM Terminal is energized when pressure switch is closed 24 Volt Humidifier Connection Furnace Star...

Page 11: ...ws the available speeds for Low High heat mode 3 When the center switch is pressed the current displayed speed shall be selected and control shall apply the newly selected speed in next heating call NOTE Always refer to the Heating Chart to choose from available heating speeds THERMOSTAT CALL AVAILABLE SPEEDS W W1 F01 F03 F04 F02 DEFAULT Heating Speed Table for 1 Stage IFC Continuous Fan Mode Spee...

Page 12: ...artment door and move the furnace gas valve manual control to the OFF position 3 Close the manual gas shutoff valve external to the furnace 4 Replace the burner compartment door Filters Filters must be used and well maintained There are no pro visions to install filters inside the furnace cabinet Refer to the chart below for minimum filter sizes A deep pleated filter or electronic air filter may a...

Page 13: ...se then should be wired to the furnace accordingly CHECKING FOR PHASING PRIMARY TO SECONDARY OF UNMARKED TRANSFORMERS VOLT OHM METER G ND PRIMARY SECONDARY TRANSFORMER R C METER READS 24 VOLTS LINE VOLTAGE NEUTRAL LINE VOLTAGE L1 HOT VOLT OHM METER METER READS 120 VOLTS VOLT OHM METER C R G N D N L1 VOLT OHM METER READS 96 VOLTS IN PHASE C R G N D N L1 VOLT OHM METER READS 144 VOLTS OUT OF PHASE I...

Page 14: ...formance Filters should be cleaned permanent or replaced disposable every two months or as required It is the owner s responsibility to keep air filters clean When replacing a filter it must be replaced with a filter of the same type and size Induced Draft and Circulation Blowers The bearings in the induced draft blower and circulator blow er motors are permanently lubricated by the manufacturer N...

Page 15: ...f the unit adjust the gas valve pressure regulator or resize orifices CAUTION Always connect a manometer to the outlet tap at the gas valve before adjusting the pressure regulator In no case should the final manifold pressure vary more than plus or minus 3 inches water column from 3 5 inches water column for natural gas or 10 inches water column for propane gas To adjust the pressure regulator on ...

Page 16: ...379 947 45 20 40 80 160 400 20 45 90 180 360 900 46 78 157 391 21 43 86 171 343 857 47 19 38 76 153 383 22 41 82 164 327 818 48 75 150 375 23 39 78 157 313 783 49 147 367 24 37 75 150 300 750 50 18 36 72 144 360 25 36 72 144 288 720 51 141 355 26 34 69 138 277 692 52 69 138 346 27 33 67 133 265 667 53 17 34 136 340 28 32 64 129 257 643 54 67 133 333 29 31 62 124 248 621 55 131 327 30 30 60 120 240...

Page 17: ...1 CHECKING AUXILIARY LIMIT CONTROL 22 S 302 CHECKING FLAME ROLLOUT CONTROL 22 S 303 INDUCED DRAFT BLOWER MOTOR 23 S 304 CHECKING GAS VALVE REDUNDANT 23 S 305 CHECKING MAIN BURNERS 24 S 306 CHECKING ORIFICES 24 S 307 CHECKING GAS PRESSURE 24 S 308 CHECKING HOT SURFACE IGNITOR 27 S 309 CHECKING FOR FLASHBACK 27 S 310 CHECKING PRESSURE SWITCH 27 S 311 HIGH ALTITUDE APPLICATION USA 28 S 312 CHECKING F...

Page 18: ...aced replace with AWM 105 C 2 64 thick insulation of the same gauge or its equivalent CHECKING THERMOSTAT WIRING AND ANTICIPATOR S 3A THERMOSTAT AND WIRING WARNING Disconnect ALL power before servicing 1 Remove the blower compartment door to gain access to the thermostat low voltage wires located at the furnace integrated control module terminals 2 Remove the thermostat low voltage wires at the fu...

Page 19: ...r completing check and or replacement of trans former and check and or repair of control circuit reinstall blower compartment door 8 Turn on electrical power and verify proper unit operation S 16 CHECKING AIR CIRCULATOR BLOWER MOTOR MULTI SPEED ECM WARNING Disconnect ALL power before servicing 1 Remove blower compartment door to gain access to the circulator blower motor and integrated ignition co...

Page 20: ...les for the quantity of air If the total external static pressure exceeds the minimum or maximum allowable statics check for closed dampers reg isters undersized and or oversized poorly laid out duct work Amana Electronic Ai r Cleaner Ca ution High Voltage To a void per sonal in j u ry wait 15 secon ds afte r de ene rgizing u nit b efore touch i n g unit i n terior CUTAWAY OF DUCTWORK TO EXPOSE CO...

Page 21: ...00 CHECKING PRIMARY LIMIT CONTROL All use a nonadjustable automatic reset bi metal type limit control Refer to the following drawing for the location of the primary limit Location of Primary Limit Primary Limit Control Location 80 Upflow Furnace Shown Counterflow Similar Style 1 drawing illustrates the Primary Limit used on the 80 furnaces Style 1 WARNING Do not bypass any safety circuit WARNING H...

Page 22: ...rsonal injury or death VOLT OHM METER RED RESET BUTTON COLOR IDENTIFYING TAB Testing Auxiliary 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 S 302 CHECKING FLAME ROLLOUT CONTROL A temperature activated manual reset control is mounted t...

Page 23: ... regulation and 100 percent safety shut off WARNING Disconnect ALL power before servicing Single stage gas valves should be tested on the furnace with 24 VAC connected to the gas valve and manometers read ing supply line and manifold pressures 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 t...

Page 24: ...der to prevent distortion In no instance should an orifice be peened over and redrilled This will change the angle or deflection of the vacuum effect or entraining of primary air which will make it difficult to adjust the flame properly This same problem can occur if an orifice spud of a different length is substituted WARNING Disconnect ALL Gas and Electric Power Supply 1 Check orifice visually f...

Page 25: ...wer before servicing or in stalling this unit Multiple power sources may be present Failure to do so may cause proper ty damage personal injury or death 5 Disconnect manometer after turning off gas at manu al shutoff valve Reinstall plug before turning on gas to furnace 6 Turn OFF any unnecessary gas appliances started in step 3 7 Turn on gas to furnace and check for leaks If leaks are found repai...

Page 26: ...ove the outlet pressure boss plug Install an 1 8 NPT hose barb fitting into the outlet pressure tap b Attach a hose and manometer to the outlet pres sure barb fitting c Turn ON the gas supply d Turn on power and close thermostat R and W contacts to provide a call for low stage heat e Measure the gas manifold pressure with burners firing Adjust manifold pressure using the Mani fold Gas Pressure tab...

Page 27: ...erature the igniter ohm reading should be from 37 68 ohms S 309 CHECKING FOR FLASHBACK Flashback will also cause burning in the burner venturi but is caused by the burning speed being greater than the gas air flow velocity coming from a burner port Flashback may occur at the moment of ignition after a burn er heats up or when the burner turns off The latter is known as extinction pop Since the end...

Page 28: ...NSI Z223 1 and information provided by the gas supplier to determine the proper orifice size S 312 CHECKING FOR DELAYED IGNITION Delayed ignition is a delay in lighting a combustible mixture of gas and air which has accumulated in the combustion chamber Furnace design makes this extremely unlikely unless safety controls have been by passed or tampered with Never by pass or alter furnace controls I...

Page 29: ...kout The following drawings illustrate from a bottom view the ap proximate distances for the ignitor and flame sensor to the gas in shot burner You will note they are in the main burner stream not in the carry over ports as shown in the following figure Flame Sensor Models with Integrated Ignition Control Flame Sensor Probe 80 Upflow Model Shown Counterflow Similar WARNING HIGH VOLTAGE Disconnect ...

Page 30: ...M80SN0803B 0 70 0 06 0 85 0130F00505 DM80SN0804B 0 70 0 06 0 85 0130F00505 DM80SN0805C 0 75 0 07 0 90 0130F00506 DM80SN1005C 0 70 0 06 0 85 0130F00505 DM80SN1205D 0 80 0 05 0 95 0130F00507 DC80SN0403A 0 60 0 06 0 75 0130F00504 DC80SN0603A 0 60 0 06 0 75 0130F00504 DC80SN0804B 0 60 0 06 0 75 0130F00504 DC80SN1005C 0 80 0 05 0 95 0130F00507 DM80SN DC80SN Pressure Switch Trip Points And Usage Chart M...

Page 31: ...367 315 N A F02 1141 1089 1045 1001 958 914 869 823 F03 1311 1267 1226 1189 1150 1114 1072 1034 F04 1395 1347 1309 1270 1233 1199 1164 1125 F05 1490 1447 1407 1373 1336 1303 1269 1237 F06 1553 1510 1469 1435 1401 1368 1335 1300 F07 1593 1548 1508 1474 1440 1409 1376 1343 F08 1776 1735 1695 1661 1628 1601 1570 1542 F09 1853 1812 1773 1739 1708 1679 1650 1623 F01 837 752 671 576 501 426 361 315 F02 ...

Page 32: ...522 439 367 315 N A F02 1141 1089 1045 1001 958 914 869 823 F03 1311 1267 1226 1189 1150 1114 1072 1034 F04 1395 1347 1309 1270 1233 1199 1164 1125 F05 1490 1447 1407 1373 1336 1303 1269 1237 F06 1553 1510 1469 1435 1401 1368 1335 1300 F07 1593 1548 1508 1474 1440 1409 1376 1343 F08 1776 1735 1695 1661 1628 1601 1570 1542 F09 1853 1812 1773 1739 1708 1679 1650 1623 F01 837 752 671 576 501 426 361 ...

Page 33: ... F01 841 657 595 522 439 367 315 N A F02 1141 1089 1045 1001 958 914 869 823 F03 1311 1267 1226 1189 1150 1114 1072 1034 F04 1395 1347 1309 1270 1233 1199 1164 1125 F05 1490 1447 1407 1373 1336 1303 1269 1237 F06 1553 1510 1469 1435 1401 1368 1335 1300 F07 1593 1548 1508 1474 1440 1409 1376 1343 F08 1776 1735 1695 1661 1628 1601 1570 1542 F09 1853 1812 1773 1739 1708 1679 1650 1623 F01 837 752 671...

Page 34: ...02 1141 52 1089 54 1045 57 1001 59 958 62 914 869 823 F03 1311 45 1267 47 1226 48 1189 50 1150 52 1114 1072 1034 F04 1395 42 1347 44 1309 45 1270 47 1233 48 1199 1164 1125 F01 837 N A 752 N A 671 N A 576 N A 501 N A 426 361 315 F02 1316 45 1270 47 1218 49 1166 51 1114 53 1061 1000 962 F03 1353 44 1323 45 1286 46 1235 48 1183 50 1131 1085 1040 F04 1587 37 1544 38 1506 39 1459 41 1416 42 1372 1323 1...

Page 35: ...262 1233 1207 F01 760 697 636 569 481 402 349 300 F02 1286 1238 1196 1157 1117 1077 1036 998 F03 1393 1348 1308 1270 1230 1196 1158 1123 F04 1459 1414 1371 1336 1297 1264 1229 1193 F05 1753 1713 1677 1642 1611 1576 1549 1518 F06 1309 1261 1218 1182 1142 1103 1064 1025 F07 1580 1534 1495 1459 1429 1390 1356 1324 F08 1523 1483 1438 1403 1370 1336 1299 1266 F09 1643 1599 1562 1525 1491 1462 1431 1394...

Page 36: ...9 1262 1233 1207 F01 760 697 636 569 481 402 349 300 F02 1286 1238 1196 1157 1117 1077 1036 998 F03 1393 1348 1308 1270 1230 1196 1158 1123 F04 1459 1414 1371 1336 1297 1264 1229 1193 F05 1753 1713 1677 1642 1611 1576 1549 1518 F06 1309 1261 1218 1182 1142 1103 1064 1025 F07 1580 1534 1495 1459 1429 1390 1356 1324 F08 1523 1483 1438 1403 1370 1336 1299 1266 F09 1643 1599 1562 1525 1491 1462 1431 1...

Page 37: ...0 1348 1318 1289 1262 1233 1207 F01 760 697 636 569 481 402 349 300 F02 1286 1238 1196 1157 1117 1077 1036 998 F03 1393 1348 1308 1270 1230 1196 1158 1123 F04 1459 1414 1371 1336 1297 1264 1229 1193 F05 1753 1713 1677 1642 1611 1576 1549 1518 F06 1309 1261 1218 1182 1142 1103 1064 1025 F07 1580 1534 1495 1459 1429 1390 1356 1324 F08 1523 1483 1438 1403 1370 1336 1299 1266 F09 1643 1599 1562 1525 1...

Page 38: ... A 697 N A 636 N A 569 N A 481 N A 402 349 300 F02 1286 46 1238 48 1196 50 1157 51 1117 53 1077 1036 998 F03 1393 43 1348 44 1308 45 1270 47 1230 48 1196 1158 1123 F04 1459 41 1414 42 1371 43 1336 44 1297 46 1264 1229 1193 F01 956 N A 777 N A 675 N A 587 N A 468 N A 377 324 296 F02 1460 51 1404 53 1350 55 1299 57 1251 59 1203 1150 1098 F03 1561 47 1499 49 1441 51 1385 53 1336 55 1289 1243 1197 F04...

Page 39: ...t set at 7 Secs Adjustments can be made in 7 Secs increments from0 to 35 Secs Cool Off Delay Delay Seconds Default set at 65 Secs Adjustments can be made in 5 Secs increments from 0 to 120 Secs Blower Speed for Gas Heat Mode F Fxx xx Blower Speed Number F01 F02 Gas Heat On Delay Delay Seconds Default set at 30 Secs Adjustments can be made in 5 Secs increments from 5 to 30 Secs Gas heat Off Delay F...

Page 40: ...1 STAGE STATUS CODES 40 Idle Continous Fan F Compressor Cooling Low Stage Compressor Cooling High Stage Gas heat Single Stage Control OEM test Mode Mode Main Menu STATUS MENU ...

Page 41: ...culator blower motor Correct speed or replace blower motor if necessary Loose or improperly connected wiring in high limit circuit Tighten or correct wiring connection Flame sensed with no call for heat Correct short at flame sensor or in flame sensor wiring Short to ground in flame sense circuit Lingering burner flame Slow closing gas valve Open fuse Replace fuse Short in low voltage wiring Locat...

Page 42: ...control module Blown fuse or tripped circuit breaker Correct condition which caused fuse to open replace fuse Integrated control module is non functional Replace non functional integrated control module Furnace fails to operate Grounding fault Poor neutral connection Verifyneutral wire connection to furnace continuityto ground source Furnace fails to operate Open roll out switch Check for correct ...

Page 43: ...EMPERATURE RATING OF AT LEAST 105v C USE COPPER CONDUCTORS ONLY 4 UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N E C AND LOCAL CODES 5 TO RECALL THE LAST 6 FAULTS MOST RECENT TO LEAST RECENT DEPRESS SWITCH FOR MORE THAN 2 SECONDS WHILE IN STANDBY NO THERMOSTAT INPUTS COLOR CODES PK PINK BR BROWN WH WHITE BL BLUE GY GRAY RD RED YL YELLOW OR ORANGE PU PURPLE GN GREEN BK BLACK 1 2 3 4 5 6 7 8 9 1...

Page 44: ... 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 ...

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