CommunicatingControls Service Manual
Contents
1. Furnace Input Rate FINAL MANIFOLD PRESSURE SETTING inches W C KBTU hr 1st Stage 2nd Stage 3rd Stage 60 0 7 0 2 Not Adjustable 3 5 0 2 80 0 7 0 2 Not Adjustable 3 5 0 2 100 0 7 0 2 Not Adjustable 3 5 0 2 120 0 7 0 2 Not Adjustable 3 5 0 2 Manifold pressures apply for both Natural Gas amp Propane applications Note Gas valve adjustment and manifold pressure settings on these model furnaces will be the same for both Natural Gas and LP The only change to the furnace for operation to LP will be burner orifices 51 for LP Refer to LP Conversion instructions for more detailed information All information contained herein 32 is subject to change without notice Gas Furnace Pressure Switch Matrix Chart Color of H Fitting Label UHS3B060AC PS1 SWT03072 0 55 W C 0 05 W C 1200 3600 D342606P04 Blue PS2 SWT02978 0 88 W C 0 81 0 61 W C 1500 4400 C342634P61 PS3 SWT02978 1 60 W C 1 57 1 31 W C 2300 5200 C342634P61 DH3B060AC PS1 SWT03069 0 55 W C 0 05 W C 1200 3600 D342606P01 Blue PS2 SWT02978 0 88 W C 0 81 0 61 W C 1500 4400 C342634P61 PS3 SWT02978 1 60 W C 1 57 1 31 W C 2300 5200 C342634P61 51 SWT03073 0 76 W C 0 05 W C 1200 3600 D342606P05 White PS2 SWT02979 1 25 W C 1 19 0 97 W C 1500 4400 C342634P62 PS3 SWT02979 2 25 W C 2 28 1 93 W C 2300 5200 C342634P62 DH3B080AC PS1 SWT03070 0 76 W C 0 05 W C2. la P amp T Ed 2 1 COM Yellow LED T 8 O Oo Green Status LED Es OUO A Red Fault LED O00 ooa c O 8lA 0 D R B C Yi IFC LEDs BM Clock Signal LED Green LED on when IFC Clock is working Communication COM LED Amber LED ON when first powered up LED Flashes the number of communicating components in the system ex communicating stat and furnace will equal two flashes Status LED Slow flash no call for heat Fast flash call for heat Fault LED Will flash to signal a fault see fault code chart Will flash the last four faults detected when the furnace is re powered Will only flash a fault code when the furnace is receiving a call for heat FAULT LED Flash Codes 2 Flash External Lockout Retries or Recycles exceeded 3 Flash Pressure Switch Inducer Error 4 Flash Open Limit Switch 5 Flash Flame Sensed when no flame should be present 6 Flash Reversed Polarity or Ignitor Triac Fault 7 Flash External Gas Valve Circuit Error 8 Flash Low Flame Sense 9 Flash Open Inducer Limit Switch 10 Flash Communication Error Solid ON Internal GV IFC Error Solid ON with Solid Internal IFC Error STATUS ON IFC Inducer Learning Routine Sequence The furnace IFC will go through an Inducer Learning Routine for each stage of he
3. Alert Group Pressure Switch Failure Low Flame Signal Ignition Means Fault Control Failure Communicating Equipment Air Outdoor Handler Unit Comfort Furnace Control Alert Notification User Interface Displa PS3 OPEN PS3 CLOSED PS2 OPEN PS2 CLOSED PS1 OPEN PS1 CLOSED LO FLAME SNS IGNITER ERR TRIAC ERR CNTRL FAULT t Fault LED 3 Flash 6 Flash Solid ON COM LED Device count Device count Device count Alert Description Open Pressure Switch third stage Shorted Pressure Switch third stage Open Pressure Switch second stage Shorted Pressure Switch second stage Open Pressure Switch first stage Shorted Pressure Switch first stage Flame current is low but s n strong enough to allow Igniter fault Triac fault Internal Control Error aja Control Failure Twinning Fault CNTRL FAULT TWIN ERROR Solid ON count N A Internal control failure Air Handler Twinning Error Twinning Fault Flame lost or Ignition failure Soft lockout due to flame lost or ignition retries High Temp Limit Fault 27 Device 1 Line Polarity Fault Flame Detect Fault YER ERR38 Duplicate OD Temp Discharge Air Sensor Fault Faulty Outdoor Sensor Faulty Humidity Sensor AC Line Fault Temp Sensor Fault Defrost Fault 79 79 LPCO Fault 87 Roll Out Fault 88 Ground Faul
4. 5 Return Air Temperature Fault Discharge Air Temperature Fault Temperature Sensor Failure Demand Configuration Fault Equipment Change Alert N A 14 Flash RAS RNG ERR DAS RNG ERR DAS UL ERR DAS LL ERR TS 1 SHORT TS 1 OPEN TS 2 SHORT TS 2 OPEN DEMAND ERR HT CFG ERR 6 Flash 5 Flash Device count 9 Flash PM Data Corrupt Error or PM Missing Error PM Unit Data Error or PM Data Section Error Return Air Temperature Range Error Discharge Air Temperature Range Error Discharge Air Temperature Upper Limit Error Discharge Air Temperature Lower Limit Error Temperature sensor 1 shorted Temperature sensor 1 open Temperature sensor 2 shorted Temperature sensor 2 open Heat Cool Demand Conflict Error Electric Heat Configuration Error Equipment does not match valve stored at startup T Handler processor is reset or fuse is open COMM Alert cannot be reported if the processor is reset the User Interface will not be updated Alert flash code will not be implemented for initial release COMM communication errors may also be flashed on Fault LED LitePort transmissions will be allowed during ON flash codes Fuse alert notification level would show on Comfort Control but when fuse is open the COMM bus has no power 4 highest priority Faults display flash codes sequentially 2 second pause between faults and 4 second pause between sequences C
5. Fault DetectlOh iret rrt retient Contingency Operating Mode User Interface Display Navigation Gas Valve Adjustment Procedure UnitTest Cycle Venting Table Sequence of Operation Pressure Switch Pressure Switches Interconnecting Pressure Switch Operating Pressure Furnace Trouble Shooting Furnace Alert Code Addendum sese Communicating Air Handler aerei Communicating Mode Drawing User Interface Display Assembly Air Handler Sequence of Operation amp LEDs Identification omen eoe 42 2 eee 45 Fault LED and Error Code 46 Air Handler Trouble Shooting Checklist 47 Communicating Two Compressor Outdoor Units T Charge Assist En nri EEREUURS Internal Refrigerant Plping iore ctii rers Field Refrigerant Piping Duct Work Low Ambient Cooling Manual Charging Instructions R 22 A C Charging Charts irren aree prre Schematic Diagrams eene R 22 H P Chargirig C alte
6. e oe Ts W3h5r ec o e ODT2 Notes 7 24Volt Common B may not be required at the thermostat 2 and X2Thermostat wires are used on heat pumps installations only 3 ODT2 not required on a two stage auxiliary electric heater All information contained herein 10 is subject to change without notice 24 Volt Thermostat with a Communicating Outdoor Unit Using a 24V Harness Kit ZBAYACHPO24A For instructions components and diagrams used in the proper wiring diagram over the existing this kit order kit 24 Shown here is an unit wiring diagram excerpt from the kit for reference If the unit is a e 30 000 BTU heat pump use D154942 1 Be certain power to unit is DISCONNECTED 36 480 or 60 000 BTU heat pump use D154944 e 30 000 BTU cooling only model use D154652 2 Remove cover panel on control box compartment 36 000 48 000 or 60 000 BTU cooling only models use D154657 3 Disconnect and remove the existing communicating control harness assembly This harness consists of 6 Replace the control compartment cover panel the 4 wire plug assembly J1 Disconnect remove the red wire and fuse assembly from the transformer 7 Reconnect power which was disconnected in step 1 the blue lead from the transformer the green yellow transformer ground wire the brown wire going out 8 Please retain communication harness and trans to field connections th
7. 612345 Y CNTNGNCY MODE CNTNGNCY MODE CNTNGNCY MODE NOT AVAILABLE with data line connected and active OR NO YES YES no data line connected EXIT gt EXIT NO NO YES Mode menu on next page All information contained herein 22 is subject to change without notice Three Stage Gas Furnace Interface Display Troubleshooting continued CNTNGNCY MODE CNTNGNCY MODE STAGE NO YES YES no data line connected STAGE OFF OFF 1 2 3 DUTY CYCLE 10 10 20 30 40 50 START NO NO YES EXIT NO NO YES ARE YOU SURE NO YES Note Contingency Mode Setup and Operation is explained on page 21 All information contained herein 23 is subject to change without notice Three Stage Gas Furnace Three Stage Gas Valve Manifold Pressure Remove 120 VAC power from the furnace DO NOT Adjustment Procedures re power the furnace until the Green LED on the Inducer Motor Drive Board goes out Apply 120 VAC power to the furnace The furnace User Interface will display WAIT and then the display will change to the Contingency Mode STG 1 50 e Letthefurnace go through First Stage learning routine and its temperature rise stabilize The temperature rise and learning routine will take four minutes e Read the first stage manifold gas pressure after the furnace s temperature rise has stabilized e f needed adjust the ga
8. Furnace IFC to go back to first stage operation Or if the comfort control thermostat 17 sees the indoor temperature is not moving back towards its set point in time or the indoor temperature is still moving away from thermostat s set point it will signal the furnace IFC to go to Third Stage Heat The IFC signals the Inducer Motor Drive Board IMDB 8 to ramp the vent motor in steps to its learned third stage RPM speed As the Vent Motor Speed increases the amount of gas coming through the gas valve will increase When the IFC sees the 24 Volt AC Signal from Pressure Switch 3 PS 3 9 closing the IFC will then signal the indoor blower 4 to go to itsThird Stage Heat speed The comfort control thermostat will continue to monitor the indoor temperature and send signals to the IFC to operate at different stages or go to off so it can maintain the indoor temperature at the homeowner s set point All information contained herein is subject to change without notice Three Stage Gas Furnace 115 VOLT 60 HZ 1 PH POWER SUPPLY PER LOCAL CODE DOOR SWITCH 2 5 i 7 9 10 FLAME REVERSE roris ROLL OUT LIMIT rend 11 SWITCH mu ens d SWITCH STATUS i VALVE J 12 FAULT ASSEMBLY 5 AMP FUSE wp 13 sns 1 2 1 Sns 2 1 1 14 spun DX ae 15 em 3 LI 16 Se Pm 1 17 Communicating Thermostat All inf
9. ERR NO SYS CLK 10 Flash Fast Flash Blower motor no Comm response Inducer motor no Comm response Loss of heat cool demand Loss of clock signal Communication Fault N A 1 Flash 1 Flash Fast Flash Fast Flash No Communication Loss of Clock Signal Communication Fault None N A Comm line is dead and no bits have been received All information contained herein is subject to change without notice Alert Code Addendum Alert Code Alert Group Fuse Communicating Equipment Furnace Outdoor Unit Alert Notification User Interface Displa CHECK FUSE Fault LED COM LED Control None Alert Description 24V Fuse Open Fuse Failure Gas Valve Fault Y1 Relay Failure N A N A CHECK FUSE T Solid ON 7 Flash EXT GV ERR Device count Solid ON INT GV ERR Y1 OFF ERR Y7 ONERR Device count None 24V Fuse Open Error Control senses 24V present at the gas valve when it should not be present Control tried to turn on gas valve but 24V not sensed Control senses 24V present at the gas valve when it should not be present Y1 Output OFF when it should be ON Y1 Output ON when it should be OFF Y1 Relay Fault Y2 without Y1 Miswire 24V Heater Relay Fault Heater Relay Fault Heater Interlock Relay Fault External Shutdown Fault Return Air Sensor Fault Liquid Pressure Sensor Fault PM Bad or M
10. Failure to ignite 2200 2000 1800 263 265 267 269 271 273 275 277 279 TFI If the flame is proven the IFC will keep this step setting If flame is not proven the IFC locks out for one hour On a power interruption the furnace control starts the igniter power at the high side of it s range and repeats the learning routine The furnace IFC will call for heat and a trial for ignition is initiated If flame is not detected the IFC will recycle the furnace two more times before lockout This learning process is employed to provide the most reliable ignition process and to extend the service life of the ignitor This control requires the correct polarity of the 120V A C wiring and a ground connection If the line voltage is low or the line polarity is reversed the IFC control will lock out the heating cycle and cause the Red Fault LED to flash six times This Ignitor can only be checked by using a OHM Meter and reading it s Resistance A good ignitor reads 11 18 ohms A bad ignitor will have a much higher resistance All information contained herein is subject to change without notice Three Stage Gas Furnace INDUCER d e HE T E NEUTRAL CIRCULATOR 838 3
11. Input o 2nd Stage 65 Typical Input o 3rd Stage 100 Typical Input Communicating Control System equals simple installation limited diagnoses at the thermostat greater diagnoses capabilities at the Furnace s User Interface Module System operation and set point changes can be done via telephone with aTelephone Access Module when installed Variable speed operation of the 3 Phase Inducer Motor will allow furnace operation with up to 200 equivalent feet of vent pipe and pipe fittings Variable Speed Indoor Blower will provide more efficient operation while maintaining rated airflow over a greater range of conditions Has a Heating Test Cycle which will cycle the furnace through it three stages of heat rapidly Capable of stand alone operation Contingency Mode duty cycling of heat Convertible to Propane Gas change orifices only Operates on Propane at 3 5 manifold pressure To ensure the furnace s heating efficiency the furnace IFC will go through a RESET to the Inducer s Motor s learning routine after 150 Cycles in First Stage Heat 100 Cycles in Second Stage Heat o 50 Cycles inThird Stage Heat 15 o Or whenever power is interrupted to the furnace and is then restored The furnace IFC communicates the following information with the Indoor V S Blower Motor o Rotation Direction o Speed amp Max CFM o Start amp Stop Commands Also Checks the V S Motor horsepower HP and will send an
12. Note 6 200 Note 6 200 Note 7 200 Note 7 Additional Notes 080 50 Note 6 120 Note 6 200 Note 7 200 Note 7 1 One SHORT radius 90 elbow is equiva lent to 10 of 3 pipe and one LONG 100 See Note 1 60 Note 6 200 Note 7 200 Note 7 radius elbow is equivalent to 6 of 3 120 See Note 1 See Note 1 200 Note 7 200 Note 7 pipe One 90 elbow is equivalent to 75 of 2 1 2 pipe and 5 of 2 pipe Two 45 DH3 DX3 120 Propane See Note 1 See Note 1 100 100 elbows equal one 90 elbow Altitude Altitude 7 000 FT PI 9500 FT PI 2134 M 2896 M 2 The termination tee or bend must be 060 100 Note 6 100 Note 6 100 Note 8 100 Note 8 included in the total numbers of el bows If BAYVENT100A termination kit 080 25 Note 6 60 Note 6 100 Note 8 100 Note 8 is used the equivalent length of pipe is 5 feet 100 See Note 1 30 Note 6 100 Note 8 100 Note 8 120 See Note 1 See Note 1 100 Note 8 100 Note 8 8 oon are field supplied ex DH3 DX3 120 Propane See Note 1 See Note 1 50 50 4 Low temperature icing on vent inlet or Altitude Altitude 9 500 FT PI 12 000 FT PI 2896 M 3658 M termination may cause pressure switch 060 50 Note6 50 Note6 50 Note9 50 Note 9 problems 080 See Note 1 30 Note 6 50 Note 9 50 Note 9 100 amp 120 See Note 1 See Note 1 50 Note 9 50 Note 9 DH3 DX3 120 Propane See Note 1 See Note 1 25 25 All information contained herein 27 is subject to change wi
13. back of the fur nace cabinet Do NOT install return air through the side of the fur nace cabinet on horizontal a lications NOTE Minimum return air temperature is 55 F CAUTION CONTAINS REFRIGERANT SYSTEM CONTAINS OIL AND REFRIGERANT UNDER HIGH PRESSURE RECOVER REFRIGERANT TO RELIEVE PRESSURE BEFORE OPENING SYSTEM Failure to follow proper procedures can result in personal illness or injury or severe equipment damage CAUTION LABELING WIRES LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION VERIFY PROPER OPERATION AFTER SERVICING CAUTION BURN HAZARD DO NOT TOUCH IGNITER IT IS EXTREMELY HOT All information contained herein is subject to change without notice Communication Controls Theory Of Operation The indoor thermostat indoor unit outdoor unit and other accessories communicate using two of the three thermostat wires required in this type of installation The three wires are the Data line D Common Line B and 24VAC Power Line The indoor unit s transformer provides 24 Volt AC Power to itself and the thermostat The outdoor unit has its own 24VAC transformer and will only require the Data Line and the Common Line for operation e Three wires needed between the indoor unit and thermostat D R amp B Two wires needed between the indoor and outdoor unit D amp B e The communicating system is
14. error message if HP is not correct The furnace IFC controls the Heating Cycles CFM all other airflows are controlled by the comfort control thermostat Silicon Nitride Hot Surface Igniter o IFC uses the proven Adaptive Learning Routine providing reliable ignition and prolonging the life of the Hot Surface Igniter ComfortR indoor blower Ramp cycle and cooling airflows are set at the comfort control thermostat No Dip Switches to set Heating V S Indoor Blower Motor time delay to off selectable at the User Interface Module These furnaces can only be controlled by a communicating comfort control The thermostat and furnace communicate digitally with each other The Data and Common thermostat wires are used for communications The furnace provides 24 Volts A C power to operate the thermostat All information contained herein is subject to change without notice Three Stage Gas Furnace INDUCER N 3 QQ LINE ve G 88 ni ocu CIRCULATOR 001 788 B 3 Es M Yellow LED d ae LI T LIS E oo SEI B E3 O Green o LED EC gt Fi o c Red Fault LED e 0 aaa R B C Y1 IFC Control Part Cnt 04836 Heating Cycle The Furnace Integrated Furnace Control IFC receives a message from the comfort control thermostat to op erate in the first second or third stage of heat Manual Reset Flam
15. number stages of compressor operation Air Conditioner or Heat Pump type of heat fossil fuel or electricity and number of stages of heat installed No dip switches to set Fault Detection amp Alert Signaling The thermostat indoor and outdoor units can provide notification of system faults When a fault is detected by the indoor unit outdoor unit or thermostat a coded message is sent on the Data Line to the thermostat and will be displayed as an Alert The thermostat will turn on the red Service LED and the display will switch back and forth between the main screen and an Alert screen The Alert screen will show the diagnostic Err code number When multiple fault codes exist at the same time it will cycle through up to 5 max by showing the next code each time it comes to the diagnostic screen The thermostat will not switch back and forth when on any other screen The service LED will not be used for signaling emergency heat or anything else when the thermostat has received an Alert message Communication between Furnace IFC and V S Motor or Inducer Motor Drive Board V S Motor IFC or IMDB TX RX Common 12 Volt All information contained herein is subject to change without notice Clearing Alerts and Approved Combinations Clearing Alerts When a fault or faults are corrected and the faults are cleared at that unit s microprocessor that micropro cessor will quit sending the
16. reached the furnace IFC will again signal the IMDB to increase the Inducer Motor back to the second stage LEARNED Speed The furnace IFC then starts flashing its Fault LED three times repeatedly No Alert message is sent to the comfort control thermostat The furnace IFC will keep operating the furnace at its second stage of heat After operating this way for one hour the furnace IFC will again check to see if PS 3 is open or can be opened If PS 3 is open or can be opened the furnace IFC will go through its learning routine for third stage heat The furnace IFC will stop flashing its Fault LED When the Comfort Control Thermostat is Satisfied e When the furnace IFC receives a signal to go down to a lower stage of operation it will signal the Inducer Motor Drive Board IMDB to lower the speed of the Inducer Motor in steps to the learned speed for that stage of operation e When the comfort control thermostat is satisfied it will send a new digital signal to the furnace IFC to shut down the heating cycle e The furnace IFC now turns off the gas valve e When the furnace IFC sees the burners have shut down no flame current it will begin the time delay period to off for the inducer motor purge cycle and the V S Indoor Blower heat exchanger cool down cycle Contingency Mode Stand Alone Operation Stand Alone Operation can only be entered at the User Interface Assembly 1 Stand Alone Operation can be set up to opera
17. the furnace IFC Drawing 3 Yellow 1st Stage Pressure Switch VOLTS D R B C Y1 4 Setthe comfort control thermostat to call for heat Connect the AC Volt Meter to the pressure switch being tested then go to step 5 5 The ACVolt Meter should read 24 Volts AC until the inducer motor comes up to speed to create the op erating pressure needed to close the switch See the pressure switch s label being tested or the Gas Furnace Pressure Switch Matrix Chart for the switch s operating pressure If the pressure switch being tested does not close when the operating pressure is reached the switch must be replaced All information contained herein is subject to change without notice Three Stage Gas Furnace Pressure Switches And Interconnecting Hose Diagram FIRST STAGE PRESSURE SWITCH p Yo ORIFICE X STAGE ONE FRONT SIDE ORIFICE BACK SIDE There is an orifice installed in the black tee This tee amp orifice assembly is connected to the black side of pressure switch 1 The orifice amp tee assembly is not universal The orifice is sized for the furnace s BTU input capacity Pressure switch 1 has two black and two gray pres sure ports The black side of pressure switch 1 is con nected to the furnace s burner box The gray side of the switch is connected to the recoupitive cells cold header tee 1 PRESSURE SWITCH BURNER BOX SECOND AND THIRD STAGE
18. 1200 3600 D342606P02 Yellow PS2 SWTO02979 1 25 W C 1 19 0 97 W C 1500 4400 C342634P62 PS3 SWT02979 2 25 W C 2 28 1 93 W C 2300 5200 C342634P62 UH3B100AC PS1 SWT03073 0 76 W C 0 05 W C 1200 3600 D342606P05 White PS2 SWT02979 1 25 W C 1 19 0 97 W C 1500 4400 C342634P62 PS3 SWT02979 2 25 W C 2 28 1 93 W C 2300 5200 C342634P62 DH3B100AC PS1 SWT03070 0 76 W C 0 05 W C 1200 3600 D342606P02 White PS2 SWT02979 1 25 W C 1 19 0 97 W C 1500 4400 C342634P62 PS3 SWT02979 2 25 W C 2 28 1 93 W C 2300 5200 C342634P62 UH3B120AC PS1 SWT03074 0 65 W C 0 05 W C 1200 3600 D342606P06 Yellow PS2 SWT02980 1 25 W C 1 19 0 97 W C 1500 4400 C342634P63 PS3 SWT02980 2 10 W C 2 12 1 79 W C 2300 5200 C342634P63 DH3B120AC PS1 SWT03071 0 65 W C 0 05 W C 1200 3600 D342606P03 Yellow PS2 SWT02980 1 25 W C 1 19 0 97 W C 1500 4400 C342634P63 PS3 SWT02980 2 10 W C 2 12 1 79 W C 2300 5200 C342634P63 Note The first stage pressure switch comes as an assembly with the H Fitting connected to it Replacement Operating MIN MAX Factory Part Number Pressure Range Inducer RPM Number Honeywell Orifice Orifice Part No 005 005 Orifice f D343192P01 500141
19. 19 001 033 032 White 0343192 02 50014119 002 033 035 Yellow N White Housing 7 D343192P03 50014119 003 033 039 Blue EN f N Black Housing N Orifice H Fitting Label Pressure Switch H Fitting a Black Side to Switch Pan White Side to Mounting Pan a From drawing gt 2 0 Orifice on White Side pointing to the outside D343192 im All information contained herein 33 is subject to change without notice Gas Furnace Communicating Systems Trouble Shooting Checklist Note Alert ERR Codes will only be displayed at the thermostat when a call for heat is being sent by the thermo stat The Red LED will be ON at the thermostat The Furnace IFC Status LED will be flashing fast the Fault LED will be flashing a fault code Note The Alert number will not be displayed at the thermostat Comfort Control Alert Fault LED User Interface Display Possible Causes ERR 1 3 Flash System Status OFF Last 4 Faults PS 1 Pressure Switch PS 1 2 or 3 possible failure 2 3 Open or Closed PS 1 amp 2 Open Furnace Drain System stopped up PS 1 amp 2 Open Inducer Motor Drive Board or Inducer Motor PS 1 2 or 3 Open Vent or Ventilation system problems ERR 4 8 Flash System Status OFF Flame Sensing Rod Coated or failure Burner not Last 4 Faults Lo grounded good Flame Sensing Rod posi
20. 2 Schematic Diagrams esee Charge Assist Sequence of Operation Charge Assist LED Indications Charge Assist Procedure Charge Assist Tool Charge Assist Procedure for a Non Communicating 24 VAC Control System eene nnns Charge Assist LEDs Summary Chart Charge Assist LED Flash and ERR Code Checklist Trouble Shooting GO NO GOTest for Serial V S Blower Motors Quick Field Test of a Serial Port V S Blower Motor Charge Assist Control Trouble Shooting Charge Assist Control Fault LED Flash Code and Trouble Shooting 69 Outdoor Unit s Alert Code Addendum 73 Coil and AmbientTemperature Sensors Temperature Resistance 74 Liquid Line Temperature Sensor Temperature Resistance 75 Liquid Line Pressure Transducer DC Volts PSIG Pressure Table 76 External Accessory Temperature Senor Temperature Resistance Table Error 89 91 126 System Commun
21. Communicating 1 Service Manual Theory of Operation Common Components sequence of Operation Service Troubleshooting n p RC Du Table of Contents Warnings and Cautions Theory of Operation Communicating Controls Dehumidification Cycle Communications Equipment Set p eer on erit ci EE RE HIER Alert Signaling heir Approved 5 Alert Code 7 Low Voltage Wiring Diagram Communicating Indoor and Communicating Outdoor Type cene 9 24 VoltThermostat with a Communicating Air Handler and a Communicating Outdoor Unit converted to a 24 Volt Control using Harness Kit BAYACHPO24AA 10 Communicating Indoor and a Single Stage AIC Outdoor Unit 12 Common Components User Interface Assembly 13 Personality Module 2 nennt 13 Variable Speed Indoor Blower Motor Serial Port Communication cesses 14 Three Stage Gas Furnaces Features etr i ree Heating Cycle Checks and Inducer Motor Drive Board Silicon Nitride Ignitor Learning Routine IFC LEDs IFC Inducer Motor Learning Routine Sequences
22. D D 24VAC R bo 24VAC Common 18 9 er B eee Y Field Wiring Diagram Communicationg Indoor Unit Non Communicating A C Outdoor Unit All information contained herein 12 is subject to change without notice Gas Furnace and Air Handler Common Components User Interface Assembly The indoor User Interface Assembly will display the model and serial number during normal unit opera tion In addition the following information can also be accessed through the display e The Units Model amp Serial Number Normal Display System Status Mode of Operation Heating Stage 1 2 or 3 Cooling Stage 1 2 or 3 or OFF thermostat not calling Requested Airflow CFM when the thermostat is calling Indoor Unit s Alert Codes UnitTest Cycle Heating Cycle Only Blower Motor Speed RPM when operating Fossil Fuel Draft Inducer Speed RPM when operat ing Last Four Alerts e Replacement Part List Personality Module Serial Number e Stand alone operation without a thermostat Duty Cycling of gas equipment Contingency Mode e Exit 13 Personality Module The communicating microprocessor controls in the indoor and outdoor units have a Personality Module plugged onto their control The Personality Module PM contains the following system specific informa tion Type of indoor unit air handler or gas furna
23. PRESSURE SWITCHES SECOND STAGE BACK SIDE OF SWITCH THIRD STAGE FRONT SIDE OF SWITCH The closing negative pressure in inches of water col umn is printed on the switch label These two switches are an assembly Separate switch es are not available DRAIN 31 RECOUP CELL COLD HEADER 2 PRESSURE SWITCH SWITCHES 2 amp 3 ARE MOUNTED BACKTO BACK GRAY SIDETO GRAY SIDE WHICH HAVE AN INTERCONNECTING PRESSURE PORT All information contained herein is subject to change without notice Three Stage Gas Furnace Honeywell Multi Stage Automatic Gas Valve Burner Box The gas furnace manifold gas pressure is modulated in steps by the pressure difference of the positive inlet burner air pressure and the negative outlet air pres sure of the recuperative cell These two pressures are connected to the gas valve These two pressures are used to set the gas valve s pressure regulator for the correct operating pressure for the stage of operation being called for by the furnace IFC 1 Stage Pressure Switch 2 4 amp 3 Stage Pressure Switch Gas Valve Heat Exchanger Cold Header st POSITIVE PRESSURE PORT NEGATNE PRESSURE 1 Stage CONNECTS TO BURNER BOX PRESSURE PORT EN CONNECTS TO RECOUP CELL PRESSURE PORT Pressure Switch Important Brass orifices located in these two legs H Fitting must be installed in this orientation
24. S FOR PROTECTION FROM THESE INHERENT HAZARDS DURING INSTALLATION AND SERVICING THE ELECTRICAL SUPPLY MUST BE DISCONNECTED AND THE MAIN GAS VALVE MUST BE TURNED OFF IF OPERATING CHECKSMUST BE PERFORMED WITH THE UNIT OPERATING IT IS THE TECHNICIAN S RESPONSIBILITY TO RECOGNIZE THESE HAZARDS AND PROCEED SAFELY WARNING Voltage Hazard Disconnect power to the unit before removing the blower door Allow a minimum of 10 seconds for IFC power supply to discharge to 0 volts Failure to follow this warning could result in property damage personal injury or death WARNING CARBON MONOXIDE POISONING HAZARD FAILURE TO FOLLOW THE SERVICE AND OR PERIODIC MAINTENANCE INSTRUCTIONS FOR THE FURNACE AND VENTING SYSTEM COULD RESULT IN CARBON MONOXIDE POISONING OR DEATH A WARNING FIRE OR EXPLOSION HAZARD SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF SHUT OFF THE GAS VALVE TO THE UNIT BEFORE SHUTTING OFF THE ELECTRICAL SUPPLY FAILURE TO FOLLOW THIS WARNING COULD RESULT IN PROPERTY DAMAGE PERSONAL INJURY OR DEATH CAUTION Safety Hazard Sharp Edge Hazard Be careful of sharp edges on equipment or any cuts made on sheet metal while installing or servicing Personal injury may result Where there is no complete return duct system the return connection must be run full size from the furnace to a location outside the utility room basement attic or crawl space Do NOT install return air through the
25. a microprocessor based system which operates as an open communications system This type of control system can be expanded easily When an additional item is added to the control system and powered up such as a communicating IFD air cleaner aTelephone Access Module TAM or a communicating humidifier it will establish communications automatically with the other components in the system Each component in the system has a pre assigned electronic address V S Indoor Blower Speeds are automatically set when the Outdoor Unit is a communication type The Cooling CFM per ton and the Heating CFM can be changed at the Air Handler or Gas Furnace User Inter Face display When the system is operating all operational messages and alerts will be sent on the data line to all communicating components in the system All compatible components can read and send messages on the data line The Air Handler or the Gas Furnace control will be the Bit Master in a communicating Comfort Control system The Bit Master can be considered to be the system clock It places timing pulses on the data line to indicate to the other connected devices exactly when their data bits can be transmitted on the data line bus All information contained herein is subject to change without notice Communication Controls Theory Of Operation 900 Series Comfort Control The communicating system s comfort control is a true thermostat sensing indoor dry bulb tem
26. at The Learning Routine is done to determine the correct amount of ventilation air for complete combustion Too much ventilation air will reduce the furnace s AFUE efficiency rating The inducer motor s speed for each stage may be different for each installation due to the different length and size of the ventilation pipe vent pipe number of pipe fittings used and the type of vent cap installed The Inducer Learning Routine is repeated each time the furnace IFC does a RESET or is powered up and the furnace s IFC receives a call for heat 19 The furnace IFC checks the pressure switches PS 1 and PS 2 They both must be open before a heating cycle can begin The furnace s IFC sends a digital signal to the Inducer Motor Drive Board IMDB to run the inducer motor at the preset factory second stage heat RPM The furnace s IFC looks for the PS 1 and PS 2 pressure switches to close A 24 Volt A C Signal goes to the furnace IFC when a pressure switch closes The furnace IFC will continue to signal the IMDB to increase the inducer speed in steps if PS 1 and PS 2 are not closed when the preset factory second stage heat RPM is reached The maximum RPM for stage two is set at 4400 RPM maximum RPM for stage one is set at 3600 RPM Fault Detection During Second Stage Heat Learning Routine If PS 1 and PS 2 are not closed when the inducer reaches 4400 RPM the furnace IFC will signal the IMDB to shut down the inducer motor The IFC flashe
27. ce e Variable speed or four speed indoor blower and horsepower of blower The number of stages of heat Type of the outdoor unit AC or HP e Number of compressor stages 1 2 or 3 e Size of the outdoor unit Indoor Air Flow and Delays Alerts The stored information is downloaded into the unit s controller when the unit is powered up This informa tion is sent to other microprocessor controls connect ed to the Data Line Note Do not remove the Personality Module PM from its control board it is model number and serial number specific to this unit If the PM is unplugged from its control board after the system is powered up the system will continue to op erate If the PM is not plugged back onto the control board an ERROR message will be displayed at the thermostat 24VAC Fuse The on board 24VAC automotive type fuse is in series with the 24VAC terminal R If the fuse opens the con trol s microprocessor remains powered If the system is running it will shut down all operation A gas furnace s gas valve or an air handler s auxiliary heat will turn off at once and there will be a several second delay before the gas furnace s Inducer motor and indoor blower is shut down The User Interface Assembly will display CHECK FUSE when the last four faults are displayed All information contained herein is subject to change without notice Variable Speed Indoor Blower Motor Operation Serial Port Communicatio
28. ce IFC will ramp up the variable speed inducer motor and the indoor variable speed blower to third stage operation for a few seconds UNIT TEST and STAGE 1 will now be displayed The furnace IFC will ramp down the variable speed inducer motor and the indoor variable speed blower to first stage operation for a few seconds The Model and Serial Number will now be displayed The variable speed indoor blower will now be operated for the heat exchanger cool down cycle and then be turned off Reconnect the Data wire to the D terminal of the furnace IFC All information contained herein is subject to change without notice Three Stage Gas Furnace Vent Length Table for Variable Speed Vent Motor Models Only Maximum Vent Length Table Installation instructions must be followed for installation of the venting system Maximum Vent Length Equivalent Feet z Notes Direct Vent 2 Pipe System Models p ay UC1 DC1 amp UX1 DX1 2 Pipe 2 5 Pipe 3 Pipe 4 Pipe 1 Not allowed UC1 UX1 040 060 60 80 100 130 2 Minimum vent length for all models 3 horizontal and vertical UC1 UX1 080 50 80 100 130 UX1C080A9601 See Note 1 60 100 130 3 The INLET Air of one pipe systems require the installation of a 90 elbow UC1 UX1 100 See Note 1 40 100 130 to prevent dust and debris from falling straight i
29. coded fault message The thermostat will then turn off the red Service LED and quit switching the display back and forth between the normal display and the Alert screen display Approved Combinations 4H 3C HP w 1 Aux 1 EH gas or electric 4H 2C HP w 2 Aux 2 EH gas or electric 4H 1C HP w 3 Aux 3 EH gas or electric 3H 3C HP w 0 Aux 0 EH 3H 2C HP w 1 Aux 1 EH gas or electric 3H 1C HP w 2 Aux 2 EH gas or electric 2H 2C HP w 0 Aux 0 EH 2H 1C HP w 1 Aux 1 EH gas or electric 1H 1C HP w 0 Aux 0 EH 3H 3C conventional gas or electric 2H 3C conventional gas or electric 1H 3C conventional gas or electric 0H 3C conventional 3H 2C conventional gas or electric 2H 2C conventional gas or electric 1H 2C conventional gas or electric 0H 2C conventional The following sequence of operation will occur when there are more stages of heat installed than the ap proved combinations list above shows Example When a two stage heat pump is installed with a three stages gas furnace the thermostat can only call for two stages of auxiliary heat as shown above When the thermostat calls for first stage auxiliary heat the fur nace IFC will operate the furnace in the second stage of heat When the thermostat calls for second stage aux iliary heat the furnace IFC will operate the furnace in the third stage of heat All information contained herein is subject to change without notice Alert Code Addendum Alert
30. e Roll Out Limit 16 Comfort Control Thermostat Checks Performed Before Starting a Heating Cycle The furnace s IFC will check to see if all of the limits are closed and the pressure switches for stage one PS 1 and stage two PS 2 are open These operating components are always checked before a heating cycle can begin Stage three PS 3 pressure switch is not checked until a call for third stage heat is received by the furnace s IFC The furnace s IFC will always start the heating cycle in the Second Stage of heat and then goes to First Stage heat or whatever stage the comfort control thermostat is calling for The furnace s IFC then communicates digitally with the Inducer Motor Drive Board IMDB and the Variable Speed Indoor Blower VSIB The furnace IFC signals the IMDB and the VSIB on itsTransmit Line and receives replies from these components on its Receive Line The three phase Inducer Motor speed is controlled by the output Voltage Level and the number of AC Cycles hertz supplied by the IMDB When the inducer s motor speed changes are needed the furnace s IFC will signal the IMDB which will change its output voltage and number of hertz An increase in voltage and an increase in the number of hertz from the IMDB will cause the inducer motor to run faster All information contained herein is subject to change without notice Three Stage Gas Furnace 30 Power Output To Inducer Motor Inducer Motor Drive Boa
31. e blue wire going out to field former for possible future use connections and the double blue wire connection terminal at the lo contractor coil Also disconnect and remove the two transformer primary wires brown red wire coming from the start capacitor and the black blue wire coming from the hi contractor The transformer is no longer used and should be removed HI Contactor 4 Connect the 24 volt harness supplied with the kit to LO Contactor the control board where the communicating harness was removed connector J1 Take the double blue lead terminal and connect to the lo contractor coil where the previous blue lead was removed Route the remaining yellow blue orange red black and yellow red wires out for field connection as shown ChargeAssist Control J1 Plug If the unit is a cooling only model not a heat pump the orange and black leads will not be used and should be capped off Transformer The table below defines maximum total length of low voltage wiring from the outdoor unit to the indoor unit and to the Comfort Control NEC Class 1 Wiring 24 Volts Wire Size Max Wire Length All information contained herein 11 is subject to change without notice Comfort Control with a Single Stage 24 Volt Controlled A C COMFORT INDOOR SINGLE STAGE A C CONTROL UNIT OUTDOOR UNIT DATA
32. e test cycle can only be entered when the thermostat is not calling and the furnace IFC is not reporting a fault Disconnect the Data wire D from the furnace IFC terminal block to ensure the UnitTest Cycle will not be interrupted Propane yale Converti Supplier Yes burner orfices only All information contained herein is subject to change without notice Three Stage Gas Furnace Scroll down using the V button at the User Interface Display until you see UNITTEST then press ENTER UNIT TEST and lt NO will be displayed Use the lt or gt arrow button to change the to a YES and then press ENTER ARE YOU SURE and NO NO will now be displayed Use the lt or gt arrow button to change the NO to a YES and then press ENTER UNIT TEST and STAGE OFF will now be displayed The variable speed indoor blower will then be turned on by the IFC for 10 seconds and then off UNIT TEST and STAGE OFF will now be displayed The Furnace IFC will now start the variable speed inducer motor and then go through the igniter warm up cycle The Furnace IFC will turn on the gas valve and when the burner flame is detected the user interface display will change 26 UNIT TEST and STAGE 2 will now be displayed The furnace IFC will now be in second stage heat and 45 seconds after flame is detected the furnace will call for the variable speed indoor blower UNIT TEST and STAGE 3 will now be displayed The furna
33. he furnace IFC will signal the Inducer Motor Control Board IMCB to begin to reduce the Inducer Motor speed in steps Inducer motor speed is reduced until the furnace IFC sees PS 2 open When PS 2 opens the furnace IFC will NOTE the Inducers Motor RPM The furnace IFC then adds an additional number of RPM to the inducer s motor second stage NOTED RPM The additional number of RPM plus this NOTED RPM is the learned second stage inducer operating RPM The furnace IFC now stores this learned operating inducer RPM for second stage heat in its memory The furnace IFC will use this stored learned operating inducer RPM for second stage heat calls it receives in the future If the furnace IFC is still receiving only a call for first stage operation it will now start the learning routine for first stage The furnace IFC will then continue to reduce the inducer motor s RPM in steps until the furnace IFC sees PS 1 open When PS 1 opens the furnace IFC will NOTE this Inducer Motor RPM The furnace IFC then adds an additional number of RPM to the first stage NOTED RPM The furnace IFC now stores this learned operating inducer RPM in its memory and uses it for first stage heat calls it receives in the future The IFC will now signal the Inducer Motor Drive Board IMDB to increase the Inducer Motors IMDB and speed to its learned RPM for first stage operation The IFC signals the indoor V S blower to operate at the programmed first stage heati
34. hort Error Discharge Air Sensor Open Error There is a faulty outdoor temp sensor There is a faulty humidity sensor Voltage too low Voltage too high Ambient Temperature Sensor Fault Out of Range Open or Shorted Coil Temperature Sensor Fault Out of Range Open or Shorted Liquid Temperature Fault Out of Range Open or Shorted External ODT Sensor Fault Out of Range Open or Shorted Defrost Fault A Defrost Fault B and or C Defrost Fault A and B and or C LPCO Fault Open outside of defrost Cycle Open flame rollout Occurs when proper earth ground is not detected Expected equipment is not reporting Comm system unrecognized response Inducer Motor unrecognized response Blower motor unrecognized response 90 Communication Busy Fault SYS COMM CRC 3 Flash Fast Flash COMM System Busy Error BLW COMM CRC 3 Flash N A Serial Motor Communication Busy Error Communication Busy Fault N A 1 Flash N A Excessive Communication CRC Errors Communication Busy Fault Communication Inactive Fault N A NO SYS CLK None 3 Flash N A Fast Flash Comm line busy and no idle has been detected COMM Bit Master Clock Error SYS COMM ERR 3 Flash Fast Flash COMM Heat Cool Demand Error BLW COMM ERR 3 Flash N A Serial Motor Communication Inactive Error Communication Fault BLW COMM ERR IND COMM ERR SYS COMM
35. icating Trouble Shooting 88 Communicating System Voltage Readings 95 Note This publication is general in nature and is intended for INSTRUCTIONAL PURPOSES ONLY It is not to be used for equipment selection application installation or specific service procedures All information contained herein is subject to change without notice Warnings and Cautions Throughout this manual there are procedures where voltage may be present and gas or refrigerant system checks may be required Read all cautions and warnings on this page before proceeding WARNING SAFETY HAZARD THIS INFORMATION IS INTENDED FOR USE BY INDIVIDUALS POSSESSING ADEQUATE BACK GROUNDS OF ELECTRICAL AND MECHANICAL EXPE RIENCE ANY ATTEMPT TO REPAIR A CENTRAL AIR CONDITIONING PRODUCT MAY RESULT IN PER SONAL INJURY AND OR PROPERTY DAMAGE THE MANUFACTURER OR SELLER CANNOT BE RESPON SIBLE FOR THE INTERPRETATION OF THIS INFORMA TION NOR CAN IT ASSUME ANY LIABILITY IN CON NECTION WITH ITS USE WARNING FIRE OR EXPLOSION HAZARD FAILURE TO FOLLOW THE SAFETY WARNINGS EX ACTLY COULD RESULT IN SERIOUS PERSONAL IN JURY PROPERTY DAMAGE OR DEATH IMPROPER SERVICING COULD RESULT IN DANGEROUS OPERA TION SERIOUS PERSONAL INJURY PROPERTY DAM AGE OR DEATH A WARNING SERVICE PROCEDURES HAZARD BODILY INJURY CAN RESULT FROM HIGH VOLTAGE ELECTRICAL COMPONENTS FAST MOVING FANS AND COMBUSTIBLE GA
36. il the thermostat sends a different signal When the furnace IFC sees PS 3 close it signals the V S indoor blower to operate at its third stage heating airflow e The furnace IFC enters a time delay so the heat exchanger and the recuperative cell warms up to its third stage operating temperature At the end of this time delay the inducer s discharge air temperature will be at its third stage operating temperature and the density of the products of combustion will be stabilized e The furnace will now signal the IMDB to reduce the inducer speed in steps until PS 3 opens e When PS 3 opens the furnace IFC will NOTE this Inducer Motor RPM e The furnace IFC then adds an additional number of RPM to the third stage NOTED RPM e The furnace IFC will now store this learned operating inducer RPM its memory and use it for third stage heat calls it receives in the future e The IFC will now signal the Inducer Motor Drive Board to increase the Inducer Motors speed to its learned RPM for third stage operation All information contained herein is subject to change without notice Three Stage Gas Furnace Faults Detected During Third Stage Learning Routine e f PS 3 is closed the furnace IFC will send a signal to the IMDB to slow down the Inducer Motor in steps trying to get PS 3 to open The furnace IFC will reduce the Inducer Motor s speed in steps until Pressure Switch PS 2 opens If PS 3 does not open when this speed is
37. issing Fault ERR 93 Y1 ON ERR ERR 101 ERR 101 7 Flash N A Y1 OFF ERR bi 104 HT ON ERR 4 Flash ERR 104 HT OFF ERR 4 Flash ERR 105 HT LK ON ERR 4 Flash ERR 105 ERR 105 ERR 106 RAS SHORT N A wa ras ren None 12 Flash ERR 114 INTLK ON ERR NTLK OFF ERR EXT SW OPEN 4 Flash 4 Flash 1 Flash 6 Flash ID MTR ERR PM UNIT ERR CAP MISMATCH PM DATA ERR 2 Flash 1 Relay Stuck Closed Error Y1 Relay Stuck Open Error Y2 without Y1 Miswire 24 volt mode only Heater Relay Stuck Closed Error Heater Relay Stuck Open Error Both Interlock Relay amp Heater Relay Stuck Closed Error Interlock Relay Stuck Closed Error Interlock Relay Stuck Open Error External Shutdown Input Open Error Return Air Sensor Short Error Return Air Sensor Open Error Liquid Pressure Sensor Fault Out of Range Open or PM Data Corrupt Error PM Missing Error Motor Mismatch Error PM Unit Data Error Compressor Capacity Mismatch Error PM Data Section Error Bad or Missing PM PM DATA ERR CAP MISMATCH ID MTR ERR PM MISSING PM UNIT ERR PM MEM ERROR Device count Data Section is Corrupt but PM is useable Compressor size does not match capacity in PM Blower HP OEM does not match PM Data No PM Primary Copy of Unit Data File is Corrupt Primary and Secondary copies of Unit Data File are Corrupt Bad or Missing PM
38. le 7 Time 1 60 of a Second Number of cycles per second affects the effective voltage or voltage R M S R M S Root Mean Square The value assigned to an alternating current or voltage that results in the same power dissipation in a fixed resistance as DC current or voltage of the same numerical value One or more cycles are turned off by the I EC control to control the R M S voltage supplied to the silicon nitride ignitor Cycle Turned Off 4 D Learning Process After each successful ignition the number of AC sine wave cycles are reduced The lower number of AC sine waves reduces the effective voltage applied to the ignitor and this lowers it s maximum temperature After each successful ignition attempt the burner lights then the number of cycles are reduced During this learning program the number of cycles will become too low and the gas fails to ignite 18 F 2300 2200 2100 2000 1900 1800 4 STEPS UP BELOW IGNITION TEMPERATURE 2 3 4 5 6 7 8 9 1011 12 13 14 15 16 17 18 TFI A retry is initiated by the IFC and the number of AC sine wave cycles is raised four steps up to increase the ignitor temperature If for some reason flame is still not proven on this retry for ignition the IFC then raise the AC Sine wave cycles four steps up F 2400 4 more steps light or lock out Stay here if it lights 4 steps up still no light
39. lert Codes continued Comfort Control Alert Fault LED User Interface Display Possible Causes N A TWIN ERROR Not approved Twinning Fault for V S models 2 Flash System Status OFF Ignitor position Wiring Furnace IFC Gas Valve No Last 4 Faults Gas Flame Sensing Rod Burner RECYCLE RETRY 6 Flash System Status OFF 120 VAC power wires reversed POLARITY ERR White and Black wires reversed N A System Status On Or OFF High or Low Voltage being AC VOLTS LO Supplied to the Furnace AC VOLTS HI 6 Flash System Status OFF Furnace not Grounded GND FAULT 10 Flash System Status OFF Thermostat Field wire SYS COMM ERR Furnace IFC NO SYS CLK V S BLOWER Motor BLW COMM ERR Inducer Motor Drive Board IND COMM ERR N A System Status OFF CHECK FUSE N A System Status Repower IFC replace PM DATA BAD Check thermostat set up for O D OD CAP ERR Unit size 35 All information contained herein is subject to change without notice
40. n The Serial Port Communication type of variable speed motor operates the same as the 24 volt controlled V S type except the on off control and speed signals are now a digital command signal The Motor module re ceives the command signal and replies back to the in door product control board This type of motor module is not preprogrammed at the factory The horsepower operating speeds maximum RPM and direction of ro tation information are stored in the Personality Mod ule which is located on the Gas Furnace Control IFC or an Air Handler Control AHC When the system is powered up the V S Motor programming informa tion stored in the Personality Module is sent to the V S Motor module The Serial Port Communication V S Motor has four low voltage wires plugged into it The four wires are 1 The TX wire which is used to send all digital information 2 The RX wire which is used to receive all digital information 3 24 Volt AC and DC common wire and 4 12 Volt DC wire The 12 volts are supplied by the IFC or AHC control and used to power the input and output circuits optic couplers in the V S Motor 14 V S Motor IFC or IMDB RX TX TX RX Common Common 12 Volt 12 Volt Single phase 120 or 240 volts AC power is applied to the motor module and IS NOT turned on or off by the IFC or AHC The V S Motor module converts the AC power to DC power Some of the DC voltage is reduced to power the micr
41. ng airflow Whenever the furnace is powered up or after a RESET the furnace IFC will not go through a learning 20 routine for the third stage of heat until it receives a call for the third stage of heat Third Stage Inducer Learning Routine When the furnace IFC receives a digital signal for the third stage of heat from the comfort control thermostat it will begin the inducer motor learning routine for third stage heat e The furnace will start the heating cycle in second stage if not already on and then begin the third stage learning routine e The furnace checks Pressure Switch Three PS 3 it must be open When the furnace IFC sees PS 3 open it will send a digital signal to the Inducer Motor Drive Board IMDB to run the inducer motor at the preset factory third stage RPM The furnace IFC looks for the PS 3 pressure switch to close The furnace IFC will continue to signal the IMDB to increase the inducer motors speed in steps if PS 3 does not close when the preset factory third stage RPM is reached The maximum RPM for the third stage heat is set at 5200 RPM e f PS 3 is not closed when the Inducer reaches 5200 RPM the furnace IFC will signal the IMDB to reduce the inducer motor speed in steps to its second stage LEARNED SPEED The furnace IFC flashes its Red Fault LED three times repeatedly No Alert message is sent to the comfort control thermostat The furnace IFC will keep operating at second stage of heat unt
42. nto the furnace and a UC1 UX1 120 See Note 1 15 60 130 2 horizontal or vertical straight pipe DC1 DX1 040 60 80 100 130 section connected below the elbow DC1 DX1 060 50 80 100 130 4 This appliance requires a special venting system Refer to installation DC1 DX1 080 45 80 100 130 instructions for parts list and method DC1 DX1 100 See Note 1 80 100 130 of installation DC1 DX1 120 See Note 1 15 60 130 5 letter may be C7 or T Non Direct Vent 1 Pipe System 6 Use of vent pipe smaller than 3 in diameter is not permitted for UH3 amp UC1 UX1 amp DH3 models in propane applications DC1 DX1 040 060 50 80 80 130 PP UC1 UX1 amp DC1 DX1 080 40 80 80 130 7 Maximum vent length is 150 for UH3 amp DH3 models in propane ap UX1C080A9601 See Note 1 60 80 130 plications at an altitude of 0 7 000 feet UC1 UX1 100 See Note 1 40 80 130 8 Maximum vent length is 100 for is UH3 amp DH3 models in propane ap UC1 UX1 amp DC1 DX1 120 See Note 1 25 70 130 plications at an altitude of 7 000 9 500 DC1 DX1 100 See Note 1 80 80 130 feet For UH3 and DH3 Propane Applications See Notes 6 9 9 Maximum vent length is 38 for UH3 amp DH3 models in propane applica Models 2 tions at an altitude of 9 500 12 000 UY DY amp UX DX R 2 Pipe 2 5 Pipe 3 Pipe 4 Pipe feet UX2 DX2 amp UH2 DH2 p ge p p UX3 DX3 amp UH3 DH3 Altitude Altitude 0 7 000 FT PI 0 2134 M 060 200
43. on at the User Interface Assembly for the third stage of heat with a 50 duty cycle then depower and then repower the furnace Let the furnace go through the stage 3 learning routine and its temperature rise to stabilize This temperature rise and learning routine will take three to four minutes The dust cap screw covering the third stage pressure adjustment screw must be in place during manifold gas pressure readings Remove the dust cap and adjust the gas valve third stage of heat pressure adjustment screw one turn Third Stage Adjustment Counter Clockwise To Decrease Or Clockwise To Increase Pressure Replace and tighten the dust cap for the third stage adjustment screw and then read the manifold pressure again This procedure may need to be repeated until the manifold gas pressure is 3 5 of Water Column pressure Once the third stage gas pressure is adjusted turn the gas valve switch to the OFF position Operate the furnace for two more minutes to cool down the heat exchanger 25 e Remove 120 VAC power from the furnace DO not re power the furnace until the Green LED on the Inducer Motor Drive Board goes out Turn the gas valve switch to the ON position Again operate the furnace in the contingency mod of operation in first stage of heat with a 50 duty cycle Re adjust the first stage pressure adjustment screw if the adjustment of the third stage adjustment affected the first stage setting If the first stage pres
44. oprocessor inside the V S Motor module A communication fault will appear if line volt age is removed from the V S Motor module and the IFC or AHC system is then repowered When blower operation is called for the V S Motor module turns the DC power on and off to each leg of its three phase mo tor in a rotating manner The V S Motor Module will increase the voltage and number of Hertz it applies to its three phase motor to increase its speed or de crease the voltage and Hertz to slow it down The V S Motor module monitors the motor s RPM and power and compares this information to its programmed in formation If the RPM and power do not align with the programmed information the V S Motor module will change its output voltage and Hertz to bring the airflow back in line with its program All information contained herein is subject to change without notice Three Stage Gas Furnace HIGH TEMPERATURE LIMIT SWITCH BURNER SIGHT GLASS ELECTRICAL JUNCTION BOX FLAME ROLL OUT 2ND STAGE PRESSURE SWITCH 3RD STAGE PRESSURE SWITCH TRANSFORMER VENT MOTOR DRIVE BOARD INTEGRATED FURNACE CONTROL SWITCH MANUAL RESET 1ST STAGE PRESSURE SWITCH THREE STAGE GAS VALVE VARIABLE SPEED VENT MOTOR AND BLOWER TCO LIMIT DOOR SWITCH V S SPEED MOTOR USER INTERFACE Features Three Stages of heat provide better comfort control 1st Stage 4096 Typical
45. ormation contained herein 29 is subject to change without notice Three Stage Gas Furnace Pressure Switch Testing 1 Connect a slope gauge or magnehelical gauge to the recoup cell cold header and the burner box fittings using field supplied tees and hoses see drawing 1 Burner Box Drawing 1 15 Stage Pressure Switch H Fitting 2 amp 3 Stage Pressure Switch SLOPE GAUGE Gas Valve Heat Exchanger Cold Header Field Supplied 2 Connect an AC Volt Meter to the pressure switch being tested Connect the meter leads to the pressure switch terminals see drawing 2 The AC Volt Meter should read 24 Volts AC if the 24 Volts AC is present at the switch go to step 4 if the 24 Volts AC is not read go to step 3 Drawing 2 1 Stage Switch OLTS e 30 3 Check for 24 Volts AC coming to the pressure switch see drawing 3 Connect one lead of the AC Volt Meter to the B C terminal of the gas fur nace low voltage terminal board and the other AC Volt Meter lead will be connected to one pressure switch terminal one at a time to see if 24 Volts AC is being supplied to the pressure switch If 24 Volts AC is present at both pressure switch termi nals the pressure switch is closed and it must be replaced Check the following furnace s compo nents if 24 Volts AC is not being supplied to the pressure switch 5 amp fuse transformer wiring and
46. perature and relative humidity When the thermostat senses the in door air temperature or humidity has changed from the set point it will send an operational message on the data line All units that are connected to the data line will read this operational message The unit or units being called for will start and run on first stage a gas furnace will start in the second stage of operation and then go back to the first stage of operation The thermostat also sends blower speed information Operation is similar to a standard two stage thermo stat When the indoor temperature does not move back towards the thermostat set point in a given time period or the temperature continues to move away from the set point the thermostat will change its op erational message on the data line The new message will be a call for the next stage of operation When the indoor temperature moves back towards the set point the thermostat will again change its operational mes sage on the data line and the units running will then go back to first stage of operation When the indoor tem perature is back to the set point temperature and the minimum run time for the equipment has been met the thermostat will send another new operational mes sage that the system is to shut down and any indoor blower off delays will begin Indoor Dehumidification Control Cycle When the indoor humidity in the cooling cycle is above the thermostat humidity set point the thermostat me
47. place Dust Caps when adjustments are complete and the manifold pressure is being read All information contained herein 24 is subject to change without notice Three Stage Gas Furnace FINAL MANIFOLD PRESSURE SETTING inches W C Furnace Input Rate KBTU hr 0 7 0 2 Not Adjustable 3 5 0 2 80 0 7 0 2 Not Adjustable 3 5 0 2 100 0 7 0 2 Not Adjustable 3 5 0 2 Not Adjustable Manifold pressures apply for Natural Gas amp Propane applications Note Gas valve adjustment and manifold pressure settings on these model furnaces will be the same for both Natural Gas and LP The only change to the furnace for operation to LP will be burner orifices 51 for LP Refer to LP Conversion instructions for more detailed information First Stage Adjustment Clockwise To Decrease Or Counter Clockwise To Increase Pressure e Once the first stage gas pressure is adjusted turn the gas valve switch to the OFF position Operate the furnace for two more minutes to cool down the heat exchanger The furnace IFC will stop the first stage 50 duty heating cycle after ten minutes To manually exit the first stage contingency cycle remove 120 VAC power from the furnace DO not re power the furnace until the Green LED on the Inducer Motor Drive Board goes out Turn the gas valve switch to the ON position Again turn on the 120 VAC power to the furnace Set up the furnace in the CONTINGENCY MODE of operati
48. rd LED S Communication COM LED Green COM LED ON No Call For Inducer Motor COM LED FLASHING Call For Inducer Motor Operation STOP LED OFF ON Only Flashes When IFC Signals Inducer Motor Drive Board To Turn Off VCC 12 VDC Input TX Data Output GND Ground Common RX Data Input COM LED STOP LED O Note 1 When IMDB amp IFC are not communicating the User Interface will display no data when inducer RPM is selected at Ti EGND L2 L1 Power Plug 120 V A C Input All information contained herein 17 is subject to change without notice Silicon Nitride Ignitor Learning Routine The ignitor is constructed of a tungsten heater element and silicon nitride ceramic insulators The voltage rating of the ignitor is 80 volts R M S which is less than the line voltage applied to the furnace therefore the control will reduce the number of cycles it supplies to the SiNi ignitor per second The control checks the line voltage constantly and when a call for heat is received the control sets the number of cycles it is going to supply to the ignitor based on the line voltage it is reading This reduced number of AC sine wave cycles per second reduces the effective voltage R M S applied to the SiNi ignitor per second If the line voltage is low the number of cycles will go up or if the line voltage is high the number of cycles is reduced 60 Hertz AC Sine Wave One Cyc
49. riginal message it will stop sending its message and try again later When a good operating message has been received by the indoor and the outdoor unit the system will begin to operate The Indoor and Outdoor units use this operating message Equipment Setup until a different operational message is received This operating message is being sent repeatedly If the system is running and the units do not receive a good operating message within four minutes the system will shut down This four minute run time prevents the system from shutting down if a component receives a corrupted operating message A corrupted message could be caused by two components sending a message at the same time over written message noise or electrical interference noise on the data line When commutations are reestablished the system will again operate When the system is powered up the microprocessors in the thermostat indoor unit outdoor unit and other accessories will establish communications with each other This is known as a plug and play system A minimum amount of set up may be required at the indoor thermostat for approved equipment combinations and their accessories reference page 6 Approved Combinations The information supplied by the outdoor unit is used by the indoor unit to set up the indoor blower airflow CFM and any delays needed The thermostat uses the information from the indoor and outdoor units to configure the thermostat for the
50. s sage being sent can cause the system to continue to run to a maximum of three degrees below the ther mostat set point This will help control humidity under light loads conditions This cycle is adjustable from 1 to 3 degrees in the Installer Setup Menu 0380 and 0383 Refer to Comfort Control Installer s Guide setup menu for complete menu e Minimum compressor run time is three minutes e Minimum compressor off time is five minutes Frost Control cycle is used when a humidifier is in stalled and the control system has an outdoor tem perature sensor installed The frost control works by reducing the humidity level in the home when out door conditions can cause condensation or frost to form on windows The factory setting is five To re duce the condensation or frost on the windows low er the number If the humidity is too low in the home at the factory setting of five increase the number See advanced thermostat setup for programming setup instructions All information contained herein is subject to change without notice Reliable Communications To insure that the message being sent by a component ex thermostat indoor or outdoor unit is not being over written by another components operational message noise or electrical interference the sending component will monitor its own operational message on the data line The message must match the original message If the message does not match the sending components o
51. s its Red Fault LED three times repeatedly for thirty seconds This thirty second inducer off period is done so any accumulated water that may be in the vent system can drain out The IFC will repeat this cycle three times if needed before it locks out for one hour See Trouble Shooting Pressure Switch procedure After the thirty second off period the IFC will stop flashing the Fault LED and then will signal the IMDB to again start the inducer motor and go to the preset factory second stage heat RPM All information contained herein is subject to change without notice Three Stage Gas Furnace When PS 1 and PS 2 switches do close the furnace IFC will then start the ignition cycle The IFC now starts the Igniter warm up cycle See Silicon Nitride Ignitor Learning Routine Near the end of the warm up cycle the furnace IFC will turn on the Gas Valve When the burner flame is detected by the furnace IFC a forty five second time delay for indoor blower operation begins The forty five second time delay allows the heat exchanger and the recuperative cell to warm up the end of this delay time the inducer s discharge air temperature will be at its operating temperature and the density of the products of combustion will stabilize The furnace IFC now signals the V S indoor blower to run at the programmed second stage heating airflow The furnace IFC will now start its inducer second stage heat airflow learning routine T
52. s valve s first stage of heat pressure adjustment screw to obtain the correct first stage pressure Use Final Manifold Pressure Settings table for the correct first stage pressure reading in inches of Water Column pressure Turn off the 120VAC power to the furnace Turn the screw inside the Manifold Gas Pressure Port once counter clockwise to open the port Connect a field supplied U Tube Manometer with field supplied rubber tubes and tees to the three stage furnace as shown in the hook up diagram Remove the thermostat wire from the furnace s IFC D terminal Apply 120 VAC power to the furnace The furnace User Interface will display WAIT then model and serial number Set up the furnace in the contingency mode of operation at the User Interface Assembly for the first stage of heat with a 50 duty cycle See contingency mode of operation for additional details User Interface Assembly Hook Up Diagram NOTE 1 CONNECTS TO BURNER BOX 7 PRESSURE HOSE FIELD SUPPLIED T POSITIVE PRESSURE PORT CONNECTS TO BURNER BOX PRESSURE PORT INLET GAS PRESSURE PORT NEGATIVE PRESSURE PORT CONNECTS TO RECOUP CELL PRESSURE PORT MANIFOLD GAS PRESSURE PORT FIRST STAGE GAS PRESSURE ADJUSTMENT SCREW See Note 1 PORT CONNECTS TO BURNER BOX PRESSURE PORT THIRD STAGE PRESSURE ADJUSTMENT SCREW See Note 1 Note 1 Dust Cap Cover Removed for gas pressure adjustment Re
53. sure adjustment screw setting is now changed you will have to again go to the third stage heat and check its operating pressure If the third stage operating gas pressure has again changed you will have to adjust it again and then recheck the first stage operating gas pressure Adjust the first stage and third stage pressure adjustment screws until minimum interaction between the two are seen When the correct operating gas valve pressures are obtained turn the furnace off Remove the field supplied manometer tubing and the tee installed at the beginning steps and TIGHTEN DOWN THE MANIFOLD DUST CAPS and the GAS PRESSURE PORT SCREW Reconnect the thermostat data line to the D terminal of the furnace Turn on the 120V power to the furnace With the thermostat data line connected to the furnace and communications between the thermostat and the furnace re established the furnace operation will now be controlled by the comfort control thermostat MAIN BURNER ORIFICE DRILL SIZE NAT GAS INPUT RATING BTUH NUMBER OF BURNERS 60 000 3 45 51 80 000 4 45 51 100 000 5 45 51 120 000 6 45 51 Opening Gas Characteristics LP Kit Unit Test Cycle A qualified technician can cycle the variable speed indoor blower and the three stage gas furnace through its three stages of heat at the User Interface Assembly The Unit Test Cycle will be entered at the User Interface assembly e Th
54. t Equipment Missing 90 Communication Busy Fault TWIN ERROR RECYCLE RETRY RECYCLE LO RETRY LO AUX LIMIT HIGH LIMIT IND LIMIT POLARITY ERR FLAME ERROR DAS SHORT DAS OPEN AC VOLTS LOW AC VOLTS HI ROLLOUT OPEN GND FAULT SYS COMM CRC 2 Flash 2 Flash 4 Flash 6 5 Flash 15 Flash 5 Flash 5 Flash Device count Device count count Device count N A Device count 6 Flash 11 Flash 13 Flash 2 Flash 3 Flash IND COMM CRC BLW COMM CRC 4 Flash 7 Flash 10 Flash Device count Device count Fast Flash Twinning Not Allowed with Variable Speed Flame is off when flame should be detected Furnace tries to relight itself Furnace tries to light but no flame is detected 10 recycles within a single call for heat will cause 1hr lockout 3 ignition attempts in a row within a single call for heat results in 1 hr lockout Open Reverse Flow Heat exchanger temperature too high Could be caused by low airflow or fan failure Open High Limit Heat exchanger temperature too high Could be caused by low airflow or fan failure The device needs to be replaced Flame detected should not be present Duplicate zone Another zone is present with the same zone number Another air filter timer is present fier pad timer is present ity sensor is present Duplicate OD temperature sensor Discharge Air Sensor S
55. t the YES and then press ENTER Turn 120 VAC power off When the Green LED on the Inducer Drive Motor Board goes out turn 120 VAC power back on When the furnace is operating in the Contingency Mode Stand Alone Operating Cycle the User Interface will display the following information The top line will say CNTNGNCY Mode The bottom line will show the operating stage number STG 1 2 or 3 selected and the percent number 10 50 96 selected All furnace operating limits pressure switches and communications between the IFC and the IMDB and the V S Indoor Blower will be monitored for proper safe operation of the furnace The lt gt A V and ENTER buttons do not function in the contingency mode of operation To exit the Contingency Mode of operation turn off the 120VAC power to the furnace The Contingency Mode Stand Alone Operation will stop for any of the following reasons 1 Asignal is received from the thermostat Data wire D from the thermostat reconnected to the furnace IFC D terminal block 2 Power removed from the furnace and then turned back on 3 The furnace operation 4 A fault is detected by the furnace IFC Fault LED will be flashing a fault code IFC enters a RESET mode of Inducer RPM Minimum RPM Maximum RPM Stage 1 1200 3600 Stage 2 1500 4400 Stage 3 2300 5200 Inducer RPM are the same for all models information contained herein is s
56. te the furnace in Heating Only 2 When the thermostat is not communicating with the furnace IFC Disconnect the Data wire D from the furnace IFC terminal block 3 When the furnace IFC is not flashing a fault code at its Fault LED e Turn 120 VAC power off When the Green LED on the Inducer Drive Motor Board goes out turn 120 VAC power back on Scroll down using the down arrow V at the User Interface Display until you see CNTNGNCY Mode then press the Enter button e CNTNGNCY Mode 4 STAGE P will be displayed Press the Enter button 21 e STAGE and lt OFF OFF will be displayed A First Second or Third stage of heat must be selected Use the or arrows to select the stage of heat wanted and then push the Enter button and then the V button e DUTY CYCLE and 10 will be displayed A duty cycle must now be selected from 10 to 5096 A 1096 duty cycle will run the furnace for 2 minutes and then off for 18 minutes A 50 duty cycle will run the furnace for 10 minutes and then be off for 10 minutes These duty cycles will be repeated 3 times per hour Use the lt or arrows to select a duty cycle and then push the Enter button and then the V button Start and NO NO will now be displayed With a NO NO question being asked Use the or arrows to select the YES and then press ENTER Are you Sure and NO NO will now be displayed With a NO NO question being asked Use the gt arrows to selec
57. thout notice Three Stage Gas Furnace Furnace Sequence of Operation The comfort control thermostat signals 17 the Furnace IFC for First Stage Heat 16 IFC checks all limits 10 amp Pressure Switches PS 1 2 3 9 IFC signals the Variable Speed Inducer Drive IMDB 8 to start the Vent Motor 8 and go to its second stage speed Furnace always lights off in second stage 9 IFC sees 24 Volt AC signal from Pressure Switches PS 1 amp PS 2 when they close 9 This proves Vent Motor is moving the correct amount of combustion air through the furnace and vent system IFC starts the Hot Surface Igniter learning routine warm up time cycle 6 IFC turns on the Gas Valve 11 Trial for Ignition is five seconds The IFC proves Ignition by the flame current sensing method 7 If flame is not detected the IFC will cycle the furnace three times to try and prove flame and then the IFC locks out for one hour The IFC will send an Alarm Code It will also flash its Red Fault LED two times repeatedly If flame is detected the IFC will start the heat exchanger warm up time delay for the indoor blower 45 Seconds later the IFC signals the Indoor Blower 4 to come on and run at its second stage heat speed The IFC then signals the Inducer Motor Drive Board IMDB 8 to ramp down the vent motor in steps to the first stage vent motor speed This reduction in steps of the Vent Motor Speed will cause the Gas Flow
58. through the Gas Valve to go down in steps which will reduce the chances of a burner flame out When the IFC sees the 24 Volt AC signal from Pressure Switch 2 PS 2 9 go away it will then signal the Indoor Blower 4 to go to the First Stage Heat speed The comfort control thermostat 17 will continue to call for first stage heat operation until the indoor temperature is back at the comfort control thermostat set point or if the comfort control thermostat 17 sees the indoor temperature is not moving back towards its set point in time or the indoor temperature is still moving away from comfort control thermostat set point it will Signal the IFC 17 to go to second stage heat The comfort control thermostat 17 then signals the Furnace IFC for second Stage Heat 28 The IFC 8 signals the Inducer Motor Drive Board IMDB 8 to ramp the Vent Motor up in steps to its Learned Second Stage RPM speed AS the Vent Motor 8 speed increases the amount of gas coming through the gas valve will increase When the IFC sees the 24 Volt AC Signal from Pressure Switch 2 PS 2 9 closing the IFC will then signal the Indoor Blower 4 to go to its Second Stage Heat Speed The comfort control thermostat 17 will continue to call for second stage heat operation until the indoor temperature moves back toward its set point Before the indoor temperature reaches the comfort control thermostat 17 set point the thermostat will signal the
59. tion Low FLAME SNS Gas Pressure or IFC ERR 10 6 Flash System Status OFF Ignitor Open or Wiring IFC failure Last 4 Faults IGNITOR Trica ERR ERR 18 ON System Status OFF IFC failure Last 4 Faults CHECK CNTRL or CNTRL FAULT ERR 22 2 Flash System Status OFF Low flame current Flame Flame Detected Last Four Faults Sensing Rod Low gas pressure Then lost RECYCLE LO Burner The difference from ERR20 amp ERR22 is RETRY LO Flame was detected and then lost with an ERR22 ERR26 4 Flash System Status OFF Dirty Filter Blower motor AUX LIMIT or HIGH LIMIT Inoperative wrong blower speed Duct Work Restrictions 9 Flash System Status OFF Furnace being over fired IND LIMIT 4 Flash System Status OFF AUX LIMIT LO HIGH LIMIT LO IND LIMIT LO ERR34 5 Flash System Status OFF GAS Valve IFC or Wiring FLAME ERROR ERR87 4 Flash System Status OFF Inducer Motor running slow ROLLOUT OPEN Vent or ventilation problem ROLLOUT LO Furnace being Over Fired ERR90 10 Flash System Status OFF Communications Errors SYS COMM CRC EMI getting into control System or wiring or IND COMMM or a control Component CRC or BLW COMM CRC ERR93 ON System Status OFF Furnace wiring or jumper added EXT GV ERR Replace Furnace Control INT GV ERR ERR101 N A System Status Furnace IFC Y1 OFF ERR Furnace IFC Y1 ON ERR 34 All information contained herein is subject to change without notice Gas Furnace Communicating Systems Trouble Shooting Checklist A
60. ubject to change without notice Three Stage Gas Furnace Interface Display Troubleshooting Standy Screen Setup Menu Setup Options Current Setting MODEL NUMBER gt COOLING COOLING Note Shown only SERIAL NUMBER 2zT 2T 1 2T 3T when communicating outdoor unit is not CFM PER TON CFM PER TON detected HEAT CFM 1 1350 1350 1125 1000 700 HEAT OFF DLY HEAT OFF DLY 100s 1005 140 180 60 FACTORY DEFLTS FACTORY DEFLTS NO NO EXIT EXIT NO NO YES Information Menu Information Options MODEL NUMBER gt MODEL UH3BO60ACV3VA SERIAL NUMBER SERIAL 61234567 Y SYSTEM STATUS _ gt SYSTEM STATUS OFF REQUESTED CFM 0 LAST 4 FAULTS LAST 4 FAULTS NO ALERTS REQUESTED CFM Y INDOOR ALERTS x INDOOR ALERTS NO ALERTS UNIT TEST gt UNIT TEST 4 NO gt a YES TEMP SENSOR TEMP SENSOR Not Available For Future Use SNSR1 SNSR1 SNSR2 DLT2 1 Y MOTOR RPM I MOTOR RPM 0 RPM INDUCER RPM INDUCER RPM 4 0 RPM RESET LST FAULT IRESETLST FAULT NO NO YES Y CLEAR LITEPORT NO NO YES PART LIST LIST CNT ___ PM SERIAL NUM PM SERIAL NUM
61. ycle power to ODU to clear Faults Comfort Control will switch to OFF until this fault condition clears A device has changed since auto discovery see Installer Guide ISU 0706 to reset Pub No 18 HD32D2 2 Revision 3 08 07 2007 All information contained herein is subject to change without notice Communication Controls Theory Of Operation With Communicating Outdoor Unit COMFORT INDOOR OUTDOOR CONTROL UNIT UNIT DATA Dalee 4D 24VAC HOT R 24VAC Common B Pp 1 Y2 X2 Field Wiring Diagram Communicationg Indoor Unit Communicating Outdoor Unit All information contained herein 9 is subject to change without notice 24 Volt Thermostat with a Communicating Outdoor Unit Using a 24V Harness Kit ZBAYACHPO24A 24 VOLT THERMOSTAT 3 HEAT 2 COOL A C OR AIR OUTDOOR 3 HEAT 2 COOL HEAT PUMP HANDLER UNIT 24VAC R R 24VAC B Er rq B YA bM Y1 bp Y2 fp a Y2 D n ettet 40 X2 i 4 VY
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