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Daikin ComfortNet DX7TC Service Instructions Manual

Split system heat pumps with r-410a refrigerant blowers, coils, & accessories
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DX7TC, DX16TC & DX18TC Condensing Units,
DZ7TC, DZ16TC & DZ18TC Split System Heat Pumps
ONLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL, ADJUST,
SERVICE, MAINTENANCE OR REPAIR (HEREINAFTER, "SERVICE")
THE EQUIPMENT SPECIFIED IN THIS MANUAL SHOULD SERVICE THE
EQUIPMENT.
THIS EQUIPMENT IS NOT INTENDED FOR USE BY PERSONS (INCLUDING
CHILDREN) WITH REDUCED PHYSICAL, SENSORY OR MENTAL CAPABILITIES,
OR LACK OF EXPERIENCE AND KNOWLEDGE, UNLESS THEY HAVE BEEN
GIVEN SUPERVISION OR INSTRUCTION CONCERNING USE OF THE
APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR SAFETY.
CHILDREN SHOULD BE SUPERVISED TO ENSURE THAT THEY DO NOT PLAY
WITH THE EQUIPMENT.
THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR ANY INJURY OR
PROPERTY DAMAGE ARISING FROM IMPROPER SUPERVISION, SERVICE
OR SERVICE PROCEDURES. IF YOU SERVICE THIS UNIT, YOU ASSUME
RESPONSIBILITY FOR ANY INJURY OR PROPERTY DAMAGE WHICH MAY
RESULT. 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 SUPERVISION, INSTALLATION, ADJUSTMENT, SERVICING,
MAINTENANCE 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 SUPERVISION
OR TRAINING MAY RESULT IN PRODUCT DAMAGE, PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
This manual is to be used by qualified, professionally trained HVAC technicians only. Daikin does
not assume any responsibility for property damage or personal injury due to improper service
procedures or services performed by an unqualified person.
Copyright © 2021-2023
Service Instructions
ComfortNet™
with R-410A Refrigerant
Blowers, Coils, & Accessories
WARNING

TABLE OF CONTENTS

Important Information ................................................................2
Product Identification ..................................................................4
Accessories ................................................................................21
Product Design ..........................................................................28
System Operation ......................................................................31
Troubleshooting Chart ...............................................................35
Servicing Table of Contents .......................................................36
Servicing ....................................................................................37
Wiring Diagrams ......................................................................117
DO NOT BYPASS SAFETY DEVICES.
WARNING
RSD6200007r24
May 2023

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Summary of Contents for Daikin ComfortNet DX7TC

  • Page 1: Table Of Contents

    OR TRAINING MAY RESULT IN PRODUCT DAMAGE, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. This manual is to be used by qualified, professionally trained HVAC technicians only. Daikin does not assume any responsibility for property damage or personal injury due to improper service procedures or services performed by an unqualified person.

  • Page 2: Important Information

    IMPORTANT INFORMATION Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime a product may require service. Products should be serviced only by a qualified service technician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools, parts, testing instruments and the appropriate service manual.
  • Page 3 IMPORTANT INFORMATION SAFE REFRIGERANT HANDLING While these items will not cover every conceivable situation, they should serve as a useful guide. WARNING WARNING To avoid possible explosion: Refrigerants are heavier than air. They can “push out” the oxygen in • Never apply flame to steam to a refrigerant cylinder. If you must your lungs or in any enclosed space.

  • Page 4: Product Identification

    PRODUCT IDENTIFICATION ComfortNet™ D X 16 T C 024 1 7,8.9 11,12 Brand Engineering D - Daikin brand Major/Minor Revisions Type Voltage AC- R-410A 1 - 208/230V Single-Phase 60 Hz HP R-410A 3 - 208/230V Three-Phase 60 Hz 4 - 460V Three-Phase 60 Hz...
  • Page 5 PRODUCT IDENTIFICATION ComfortNet™ A R U F 18 B 1 4 AA 10,11 Brand Engineering* A Single-Piece Major/Minor Revisions Airhandler Unit Application Refrigerant Charge Ceiling Mount PSC Motor 4 = R-410a Multi Position PSC Motor Multi Position EEM Motor Electrical W Wall Mount PSC/EEM Motor 1 208/240V, 1 Phase, 60 Hz Cabinet Finish...
  • Page 6 PRODUCT IDENTIFICATION C A P F 1824 A 6 AA 5,6,7,8 11,12 Brand Engineering* Indoor Coil Major/Minor Revisions Refrigerant Charge Unit Application 2 = R-22 A Upflow/Downflow Coil 4 = R-410A H Horizontal A-Coil 6 = R-410A or R-22 Horizontal Slab Coil Coated Coils Nominal Width for Gas Furnace A = Fits 14"...
  • Page 7 PRODUCT IDENTIFICATION Product Category C - Indoor Coil Engineering Major/Minor Revision i r f t i s Cabinet Finish U - Uncased Nominal Width for Gas Furnace " 4 " 5 C - 21" Width " 5 plicable (Slab Coil) T - TXV 14 - 14"...
  • Page 8 PRODUCT IDENTIFICATION ComfortNet™ MB V C 12 Electrical Brand MB - Modular Blower 1: 208-230V/60Hz/1 PH Design Series Type A: First Series Variable Speed Circuit Breaker Communication Feature A: No Circuit Breaker 4-Wire Communication Ready B: Circuit Breaker Factory Heat Airflow 1200 CFM 00 No Heat...
  • Page 9 PRODUCT IDENTIFICATION ComfortNet™ D V 18 P T C B 1 4 AA 11,12 Brand Engineering* D Daikin Single Piece Major/Minor Revisions Airhandler *Not used for inventory management Unit Application Refrigerant Charge Multi Position 4 = R-410A Variable Speed Motor...
  • Page 10 PRODUCT IDENTIFICATION Brand Minor Revision D Daikin B: 1st Revision Type Major Revision X – AC R-410A B: 1st Revision Z – HP R-410A SEER 13.4 – 13.7 = 3 16.6 - 17.5 = 7 13.8 – 14.5 = 4 17.6 - 18.5 = 8...
  • Page 11 PRODUCT IDENTIFICATION 11,12 Minor Revision Brand D - Daikin Air Handler A - Corporate Air Handler Major Revision Applica�on C - Ceiling Mounted Electric Heat KW M - Mul�-Posi�onal W - Wall Mounted Refrigerant Motor 4 R410A S - MS-ECM 6 R410A or R22 V - VS-ECM Communica�ng...
  • Page 12 PRODUCT IDENTIFICATION Revisions Phase H Special case 208 V * *Refer S&R Plate...
  • Page 13 PRODUCT IDENTIFICATION DX16TC DAIKIN BRAND X [AC], 16 SEER, TWO STAGE COMPRESSOR, COMMUNICATING Model/Rev Description Introduces Daikin brand 2-stage 16 SEER condensing units with R-410A, communicating DX16TC[024-060]1AA models. DX16TC0[24, 48]1AC Refrigerant charge reduction DX16TC0[24,36,48,60]1CA 16 SEER 2-Stage AC Development with improved performance.
  • Page 14 Introduces Daikin brand 2-stage 16 SEER heat pump units with R-410A, communicating DZ16TC[024-060]1AA models. DZ16TC[024-060]1AB Introduces Daikin brand 2-stage 16 SEER heat pump units with SanHau reversing valves. Replaced compressors with Copeland's UltraTech™ 3 lineup. Transitioned coils to 7mm. DZ16TC0[24,36,48,60]1CA Offers improved performance.
  • Page 15 PRODUCT IDENTIFICATION DV**PTC*14 SINGLE PIECE DAIKIN AIR HANDLER MULTIPLE-POSITION VARIABLE SPEED PAINTED TXV WITH 4-WIRE COMMUNICATING CONTROL Model/Rev Description DV24PTCB14AA Initial release of 13 SEER air handler with communicating control and serial DV[30-36, 48]PTCC14AA communicating indoor blower motor. DV[42-60]PTCD14AA DV24PTCB14AB DV[36, 48]PTCC14AB Updating the shared data information for all DV**PTC communicating models.
  • Page 16 PAINTED, TXV, WITH 4-WIRE COMMUNICATING CONTROL Model/Rev Description DMVT24BP1400AA DMVT30BP1400AA DMVT36BP1400AA DMVT36CP1400AA Single Piece Daikin Air Handler Multiple-Position, Variable Speed, Painted, TXV, With DMVT42CP1400AA 4-Wire Communicating Control, Optimized for 2023 DOE Regulation DMVT48CP1400AA DMVT48DP1400AA DMVT60DP1400AA MBVC MODULAR BLOWER AIR HANDLER V-MULTI-POSITION VARIABLE-SPEED...
  • Page 17 PRODUCT IDENTIFICATION CAUF C-INDOOR COIL A-UPFLOW/DOWNFLOW UNCASED FLOWRATOR Model/Rev Description CAUF*****6AA Initial release of CAUF Dayton Upflow/Downflow coils. CAUF*****6BA Burr Oak Louvered Fin released in place of the Wavy Fin. CAUF****6*DA Replaced existing copper coils and other associated parts with aluminum com- ponents.
  • Page 18 PRODUCT IDENTIFICATION CHPF C-INDOOR COIL HORIZONTAL A-COIL PAINTED FLOWRATOR Model/Rev Description CHPF*****6AA Intial release of 13 SEER CHPF horizontal A coil. Released Burr Oak Louvered Fin in place of the Wavy Fin. The rows changed by one, (i.e. CHPF*****6BA 4 row to 3 row; 3 row to 2 row) where applicable. CHPF1824A6CA CHPF2430B6CA CHPF3636B6CA...
  • Page 19 PRODUCT IDENTIFICATION CAPF C-INDOOR COIL A-UPFLOW/DOWNFLOW PAINTED FLOWRATOR Model/Rev Description CAPF*****6AA Initial release of CAPF Dayton Upflow/Downflow coils CAPF*****6BA Burr Oak Louvered Fin released in place of the Wavy Fin CAPF36***CA Redesigned for performance improvement from 2 row to 3 row CAPF*****6DA Replaced existing copper coils and other associated parts with aluminum components CAPF*****6DB...
  • Page 20 PRODUCT IDENTIFICATION CAPF C-INDOOR COIL A-UPFLOW/DOWNFLOW PAINTED FLOWRATOR Model/Rev Description CAPFA3526B6AA CAPFA3526C6AA CAPFA3626B6AA CAPFA3626C6AA Initial Release. CAPFA3626D6AA CAPFA4226B6AA CAPFA4226C6AA CAPFA4226D6AA CAPFA1714A6BA CAPFA1714B6BA CAPFA1818A6CA CAPFA1818B6CA CAPFA1818C6CA CAPFA2318A6BA CAPFA2318B6BA CAPFA2318C6BA CAPFA2418A6BA CAPFA2418B6BA Major revision update for A-chassis drain port relo- CAPFA2418C6BA cation. CAPFA2422A6BA CAPFA2422B6BA CAPFA2422C6BA...

  • Page 21: Accessories

    ACCESSORIES DX16TC / DX18TC Model Description DX16TC024 DX16TC036 DX16TC048 DX16TC060 DX18TC024 DX18TC036 DX18TC048 DX18TC060 ABK-20 Anchor Bra cket Ki t TX2N4A TXV Ki t TX3N4 TXV Ki t TX5N4 TXV Ki t CSR-U-1 Ha rd-s ta rt Ki t CSR-U-2 Ha rd-s ta rt Ki t CSR-U-3 Ha rd-s ta rt Ki t...
  • Page 22 ACCESSORIES DZ7TC DZ7TC DZ7TC DZ7TC DZ7TC Model # Descrip�on 2410A* 3610A* 4810A* 6010A* ABK-20 Anchor Bracket Kit ◊ CSR-U-1 Hard-start Kit CSR-U-2 Hard-start Kit CSR-U-3 Hard-start Kit FSK01A¹ OT18-60A² Outdoor Thermostat w/ Lockout Stat TXV-FX-KX-2T TXV Kit TXV-FX-KX-3T TXV Kit TXV-FX-KX-5T TXV Kit ◊...
  • Page 23 ACCESSORIES For Applications requiring 1/4 FLARE CONNECTION a field installed access fitting BULB TO BE LOCATED AT 10 OR 2 O'CLOCK BULB SUCTION LINE EVAPORATOR COIL TAILPIECE PISTON SEAL SEAL SUPPLIED W/ KIT DISTRIBUTOR BODY SEAL SUPPLIED W/ KIT EXPANSION VALVE 3/8"- SWEAT REMOVE BEFORE INSTALLING EXPANSION VALVE...
  • Page 24 ACCESSORIES FSK01A Freeze Thermostat Wire Nut Wire Nut Install Line Install Line Thermostat Thermostat Here Here Wire Nut Wire Nut...
  • Page 25 ACCESSORIES HK* SERIES ELECTRIC HEAT KITS - ELECTRIC HEAT KIT APPLICATIONS - MBVC ELECTRIC HEAT KIT BLOWER MBVC1200AA-1** MBVC1600AA-1** MBVC2000AA-1** X = Allowable combinations ^ = Circuit 1: Single Phase for Air Handler Motor Circuit 2: 3-Phase for HKR3 Heater Kits - = Restricted combinations...
  • Page 26 ACCESSORIES ELECTRIC HEAT KIT APPLICATIONS - DVPTC Model HKSX03XC HKSX05XC HKSX06XC HKSX08XC HKSX10XC HKS*15XF HKS*20XF HKSC15XA HKSC15XB HKSC19CH HKSC19CB HKSC20DH HKSC20DB HKSC25DA HKSC25DB DV25PTCB14 DV29PTCB14 DV35PTCB14/ DV37PTCB14 DV31PTCC14 DV33PTCC14 DV37PTCC14/ DV39PTCC14 DV49PTCC14/ DV59PTCC14 DV37PTCD14 DV49PTCD14 DV59PTCD14 DV61PTCD14 Revision level that may or may not be designated. Circuit breaker option.
  • Page 27 ACCESSORIES DV**PTC14** DVPTC Heat Kit Applications † †† ††† Type / Model 24B14-A* 30C14-A* 36C14-A* 48C14-A* 42D14-A* 48D14-A* 60D14-A* HKSX03XC HKSX05XC HKSX06XC HKSX08XC HKSX10XC HKSX15XF* HKSX20XF* HKSC05XC HKSC08XC HKSC10XC HKSC15XA HKSC15XB HKSC15XF* HKSC19CA* HKSC19CB* HKSC20DA HKSC20DB HKSCX20XF* HKSC25DC* * Revision level that may or may not be designated. Refer to the minimum airflow requirements for each of the heat kits.
  • Page 28 ACCESSORIES DV**PTC14** READY 15 DVPTC Model DV25PTCB14 DV29PTCB14 DV31PTCC14 DV33PTCC14 DV35PTCB14 DV37PTCB14 DV39PTCC14 DV37PTCC14 DV37PTCD14 DV49PTCC14 DV49PTCD14 DV59PTCC14 DV59PTCD14 DV61PTCD14 HKSX03XC HKSX05XC HKSX06XC HKSX08XC HKSX10XC HKSC05XC HKSC08XC HKSC10XC HKSC15XA HKSC15XB HKSC15XF HKSC19CA HKSC19CB HKSC19CH HKSC20DA HKSC20DB HKSC20DH HKSC20XF HKSC25DA HKSC25DB...

  • Page 29: Product Design

    PRODUCT DESIGN This section gives a basic description of cooling unit operation, its various components and their basic operation. Ensure your system is properly sized for heat gain and loss according to methods of the Air Conditioning Contractors Association (ACCA) or equivalent.
  • Page 30 PRODUCT DESIGN 24-volt ac signal, moves the slider ring that covers and uncovers these vents. The vent covers are arranged in such a manner that the compressor operates somewhere around 67% capacity when the solenoid is not energized and 100% capacity when the solenoid is energized.
  • Page 31 PRODUCT DESIGN The MBVC blower cabinets use a variable speed motor that In an attic installation a secondary drain pan must be provided maintains a constant airflow with a higher duct static. MBVC by the installer and placed under the entire unit with a separate blower cabinets are approved for applications with cooling coils drain line properly sloped and terminated in an area visible to of up to 0.8 inches W.C.

  • Page 32: System Operation

    SYSTEM OPERATION COOLING HEATING The refrigerant used in the system is R-410A. It is a clear, The heating portion of the refrigeration cycle is similar to the colorless, non-toxic and non-irritating liquid. R-410A is a 50:50 cooling cycle. By energizing the reversing valve solenoid coil, the blend of R-32 and R-125.
  • Page 33 SYSTEM OPERATION When the thermostat is satisfied, appropriate commands are sent to the UC control. The compressor relay and outdoor fan relay is de-energized. The compressor high stage solenoid is de-energized if it was energized. The UC control sends an appropriate command to the indoor unit to de-energize the indoor blower motor.
  • Page 34 SYSTEM OPERATION COOLING CYCLE Reversing Valve (Energized) Indoor Outdoor Coil Coil Accumulator Thermostatic Expansion Valve Bi-Flow Filter Dryer Check Valve HEATING CYCLE Reversing Valve (De-Energized) Indoor Outdoor Coil Coil Accumulator Thermostatic Expansion Valve Bi-Flow Filter Dryer Check Valve...
  • Page 35 EXPANSION VALVE/CHECK VALVE ASSEMBLY IN COOLING OPERATION IN HEATING OPERATION Most expansion valves used in current Daikin Brand Heat Pump products use an internally checked expansion valve. This type of expansion valve does not require an external check valve as shown above.

  • Page 36: Troubleshooting Chart

    TROUBLESHOOTING CHARTS COOLING/HP ANALYSIS CHART System Unsatisfactory Com plaint No Cooling Operating Cooling/Heating Pressures POSSIBLE CAUSE Test Method DOTS IN ANALYSIS Remedy GUIDE INDICATE "POSSIBLE CAUSE" • Pow er Failure Test Voltage • • • Blow n Fuse Inspect Fuse Size & Type •...

  • Page 37: Servicing Table Of Contents

    SERVICING SERVICING TABLE OF CONTENTS CHECKING VOLTAGE ............38 S-26 TESTING TEMPERATURE SENSORS (COMFORTNET CHECKING WIRING ............38 READY MODELS ONLY) ..........86 S-3E CTK0*** COMFORTNET™ THERMOSTAT .......38 S-40A DVPTC/MBVC ELECTRONIC BLOWER/HEATER CHECKING TRANSFORMER AND CONTROL CIRCUIT ..51 CONTROL ..............86 CHECKING TIME DELAY RELAY ........51 S-60 ELECTRIC HEATER (OPTIONAL ITEM) ......90 S-8A...

  • Page 38: Checking Voltage

    SERVICING CHECKING VOLTAGE Unit Supply Voltage Voltage Min. 1. Remove outer case, control panel cover, etc., from unit 208/230 being tested. With power ON: NOTE: When operating electric heaters on voltages other than 240 volts, refer to the System Operation section on electric heaters to calculate temperature rise and air flow.
  • Page 39 SERVICING On the other hand, the indoor unit, outdoor unit, and Cooling Heating thermostat comprising a ComfortNet system “communicate” Models High High digitally with one another. It is now a two-way communications path. The thermostat still sends commands to the indoor and *SZC160241 outdoor units.
  • Page 40 SERVICING must be installed in the outdoor unit to provide 24 VAC power to Thermostat the outdoor unit’s electronic control. The transformer is included with the CTK0* kit. See kit instructions for mounting and wiring instructions. Four wires are required between the indoor unit Air Handler/Furnace/PCB and thermostat.
  • Page 41 SERVICING NETWORK TROUBLESHOOTING • Red communications LED – Indicates the status of the network. The table below indicates the LED status and the The ComfortNet™ system is a fully communicating system, corresponding potential problem. and thus, constitutes a network. Occasionally the need to •...
  • Page 42 SERVICING 7 SEGMENT LED DESCRIPTION OF CONDITION (characters will alternate) (no display) INTERNAL CONTROL FAULT / NO POWER STANDBY, WAITING FOR INPUTS HEATER KIT TOO LARGE, TOO SMALL, OR NO MATCH FUSE OPEN AUXILIARY SWITCH OPEN DATA NOT ON NETWORK INVALID DATA ON NETWORK INVALID MEMORY CARD DATA BLOWER MOTOR NOT RUNNING...
  • Page 43 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 44 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 45 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 46 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 47 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...
  • Page 48 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...
  • Page 49 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...
  • Page 50 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...

  • Page 51: Checking Transformer And Control Circuit

    SERVICING CHECKING TRANSFORMER AND CONTROL 1. Tag and disconnect all wires from male spade connections of relay. CIRCUIT 2. Using an ohmmeter, measure the resistance across terminals H1 and H2. Should read approximately 150 ohms. WARNING 3. Using an ohmmeter, check for continuity across terminals 3 and 1, and 4 and 5.

  • Page 52: Checking High And Low Voltage To Ecm Motor

    SERVICING CHECKING HIGH AND LOW VOLTAGE TO 1. Disconnect the motor leads from 6-circuit fan motor wire harness. ECM MOTOR 2. Connect a voltmeter between circuit 3 and circuits 2 (low speed) or 1 (high speed). NOTE: Circuit 3 is connected directly to L2. WARNING 3.
  • Page 53 SERVICING PCBHR101-103 PBBGR101-102...
  • Page 54 SERVICING PCBHR101-103 PBBGR101-102...
  • Page 55 SERVICING PCBHR101-103 PBBGR101-102...
  • Page 56 SERVICING PCBHR101-103 PBBGR101-102...
  • Page 57 SERVICING PCBHR101-103 PBBGR101-102...
  • Page 58 SERVICING PCBHR104/PCBHR105 7 SEGMENT LED 7 SEGMENT LED DESCRIPTION OF CONDITION (DS2) (DS1) Low Pressure CO Trip Low Side Fault High Pressure CO Trip High Side Fault Short Cy cling Locked Rotor Open Circuit Open Start Circuit Open Run Circuit No Line Voltage Low Pilot Voltage Pow er Up...
  • Page 59 SERVICING PCBHR104 Integrated control Outdoor air Shorted sensor. Check sensor Turn power OFF prior module diagnostic/status temp sensor Open sensor. connection. to repair. LED display shows the fault Sensor Replace open/ Replace with correct indicated code. disconnected. shorted sensor. replacement part. Sensor out of displays ‘---‘...
  • Page 60 SERVICING PCBHR104 Air conditioner/heat pump Data not yet Air conditioner/ Verify Turn power OFF prior fails to operate. DATA heat pump is system type to repair. Integrated control wired as part of (communicating Use memory card for module diagnostic/status a communicating or legacy) LED display shows the system and...
  • Page 61 SERVICING PCBHR104 Air conditioner/heat pump Shared data sent Verify Turn power OFF prior fails to operate. Mis-match to integrated system type to repair. Integrated control module control module (communicating Use memory card for diagnostic/status LED does not match or legacy). display shows the indicated hardware Verify shared...
  • Page 62 SERVICING PCBHR104 Digit 3 Digit 2 Digit 1 Compressor and outdoor Low Pressure Low refr igerant Ve rify refr igerant Tu rn power OFF pr ior Cut Out charge . charge; adjust as to repai r. Low pressure s witch Loc kout Restr iction in needed.
  • Page 63 SERVICING PCBHR104 Digit 3 Digit 2 Digit 1 Run time f or last 4 cycles Shor t Cycling CMPR Intermittent Chec k ther mostat Tu rn power OFF pr ior is less than 3 minutes SHR T thermostat and ther mostat to repai r.
  • Page 64 SERVICING PCBHR104 Digit 3 Digit 2 Digit 1 Compressor and outdoor Open Star t Compressor star t Chec k Tu rn power OFF pr ior Circuit ST AR T winding is open. compressor ; to repai r Low pressure and high Loc kout Failed repair/replace as...
  • Page 65 SERVICING PCBHR104 Digit 2 Digit 1 Digit 3 Air conditioner/heat High Line High line Correct high line Tu rn power OFF pr ior pump may appear to be Voltage VO LT voltage voltage condition; to repai r. operating nor mally. contact local utility Control detects line Compressor protector...
  • Page 66 SERVICING Integrated control Outdoor air Shorted sensor. Check sensor Turn power OFF prior module diagnostic/status temp sensor Open sensor. connection. to repair. LED display shows the fault Sensor Replace open/ Replace with correct indicated code. disconnected. shorted sensor. replacement part. Sensor out of displays ‘---‘...
  • Page 67 SERVICING Air conditioner/heat pump Data not yet Air conditioner/ Verify Turn power OFF prior fails to operate. DATA heat pump is system type to repair. Integrated control wired as part of (communicating Use memory card for module diagnostic/status a communicating or legacy) LED display shows the system and...
  • Page 68 SERVICING Air conditioner/heat pump Shared data sent Verify Turn power OFF prior fails to operate. Mis-match to integrated system type to repair. Integrated control module control module (communicating Use memory card for diagnostic/status LED does not match or legacy). display shows the indicated hardware Verify shared Insert memory card...
  • Page 69 SERVICING Digit 3 Digit 2 Digit 1 Compressor and outdoor Low Pressure Low refr igerant Ve rify refr igerant Tu rn power OFF pr ior Cut Out charge . charge; adjust as to repai r. Low pressure s witch Loc kout Restr iction in needed.
  • Page 70 SERVICING Digit 3 Digit 2 Digit 1 Run time f or last 4 cycles Shor t Cycling CMPR Intermittent Chec k ther mostat Tu rn power OFF pr ior is less than 3 minutes SHR T thermostat and ther mostat to repai r.
  • Page 71 SERVICING Digit 3 Digit 2 Digit 1 Compressor and outdoor Open Star t Compressor star t Chec k Tu rn power OFF pr ior Circuit ST AR T winding is open. compressor ; to repai r Low pressure and high Loc kout Failed repair/replace as...
  • Page 72 SERVICING Digit 3 Digit 2 Digit 1 Air conditioner/heat High Line High line Correct high line Tu rn power OFF pr ior pump may appear to be Voltage VO LT voltage voltage condition; to repai r. operating nor mally. contact local utility Control detects line Compressor protector if needed.

  • Page 73: Checking High Pressure Control

    SERVICING S-12 CHECKING HIGH PRESSURE CONTROL S-13 CHECKING LOW PRESSURE CONTROL The low pressure control senses the pressure in the suction WARNING line and will open its contacts on a drop in pressure. The low pressure control will automatically reset itself with a rise in pressure.

  • Page 74: S-15B Capacitance Check Using A Digital Multi-Meter

    SERVICING 2. Now Select “Capacitance” on your multi-meter. WARNING 3. Now connect the capacitor terminals to the multi-meter leads. Discharge capacitor through a 20 to 30 OHM resistor before 4. If the reading is near to the actual value of the capacitor handling.
  • Page 75 SERVICING Emerson UltraCheck-EZ™ Diagnostic Tool Power Green Motor Indication(s) The Emerson UltraCheck-EZ™ diagnostic tool may be used to Button Action diagnose the ECM motor. Confirm 24VAC to UltraCheck-EZ tool. If 24VAC is confirmed, WARNING Rotating diagnostic tool is inoperable. HIGH VOLTAGE Motor and control/end Disconnect ALL power before servicing or installing Blinking...
  • Page 76 SERVICING 3. Remove the blower assembly from the air handler or modular blower. Lines 1 and 2 will be connected 4. Remove the (3) screws securing the control/end bell to for 12OVAC Power Connector the motor. Separate the control/end bell. Disconnect the applications only 3-circuit harness from the control/end bell to remove the control/end bell from the motor.

  • Page 77: S-16H Ecm Cfm Adjustments Dvptc/Mbvc

    SERVICING Motor Checks Airflow Adjust Dipswitches - Used to adjust the airflow +/-10% Normal* +10% -10% Normal WARNING OFF ON OFF ON OFF ON OFF ON HIGH VOLTAGE Disconnect ALL power before servicing or installing this unit. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death.
  • Page 78 SERVICING MBVC AIRFLOW TABLE Htr Kw MBVC1200* MBVC1 6000* MBVC2000* Speed Selection Dip Switches Cool Adjust Profile Selection Selection Selection Switches Switches Switches 1000 1000 OFF OFF OFF OFF OFF 1000 1000 1200 1400 1500 1500 ON OFF 2000 Profiles Pre-Run Short-Run OFF Delay...
  • Page 79 BLOWER PERFORMANCE DATA SWITCH SWITCH SWITCH HTR kW MBVC1200* MBVC1600* MBVC2000* 1000 1000 1000 1000 1200 1400 1500 1500 2000 ^ Factory setting COOL SELECTION ADJUST SELECTION PROFILE SELECTION LOW STAGE HIGH STAGE SWITCHES SWITCHES SWITCHES MODEL COOL COOL MBVC1200 1000 1200 1000...
  • Page 80 SERVICING Speed Selection Dip Switches Cooling/Heat Pump Airflow Table Low stage High stage Cool Adjust Profile Continuous Model Speed tap Selection Selection Selection (CFM) (CFM) Switches Switches Switches Speed DV24PTCB14 OFF OFF OFF OFF OFF OFF ON 1125 DV30PTCC14 1020 Profiles Pre-Run Short-Run...
  • Page 81 SERVICING READY DVPTC AIRFLOW TABLES Cooling/Heat Pump Airflow Table Speed Selection Dip Switches MODEL Tap Low Stage High Stage Cool Adjust Profile Continu- Selection Selection Selection ous Fan DV25PTCB14 Switches Switches Switches Speed S6 S12 S13 1020 OFF OFF OFF OFF OFF OFF OFF OFF ON OFF ON OFF ON OFF ON OFF DV29PTCB14 OFF ON OFF ON OFF ON OFF ON...
  • Page 82 SERVICING READY DVPTC AIRFLOW TABLES DIP SWITCH SETTING & AIRFLOW TABLE FOR ELECTRIC HEAT DV35PTCB14 DV25PTCB14 DV29PTCB14 DV33PTCC14 DV39PTCC14 DV49PTCC14 DV37PTCC14 DV59PTCC14 DV37PTCD14 DV59PTCD14 DV49PTCD14** DV61PTCD14*** DV31PTCC14 DV37PTCB14 (kW) 1030 1110 1060 1150 1060 1200 1150 1250 1090 1090 1120 1240 1220 1320...

  • Page 83: Servicing

    SERVICING S-17 CHECKING COMPRESSOR WARNING WARNING HIGH VOLTAGE Disconnect ALL power before servicing or installing Hermetic compressor electrical terminal venting can be dangerous. this unit. Multiple power sources may be present. When insulating material which supports a hermetic compressor Failure to do so may cause property damage, personal or electrical terminal suddenly disintegrates due to physical abuse injury or death.

  • Page 84: S-17C Unloader Test Procedure

    SERVICING Disconnect all power to unit, making sure that all power legs are open. 1. DO NOT remove protective terminal cover. Disconnect the three leads going to the compressor terminals at the nearest point to the compressor. 2. Identify the leads and using an ohmmeter on the R x 10,000 scale or the highest resistance scale on your ohmmeter check the resistance between each of the three leads separately to ground (such as an unpainted...

  • Page 85: Testing Crankcase Heater (Optional Item)

    SERVICING S-21 CHECKING REVERSING VALVE AND 1. Remove unit wiring from disconnect switch and wire a test cord to the disconnect switch. SOLENOID NOTE: The wire size of the test cord must equal the line wire size and the fuse must be of the proper size and type. Occasionally the reversing valve may stick in the heating or 2.

  • Page 86: Testing Temperature Sensors (Comfortnet Ready Models Only)

    SERVICING S-26 TESTING TEMPERATURE SENSORS All dipswitches necessary to setup cooling, heat pump, and electric heat airflow are fully integrated into the control. (COMFORTNET READY MODELS ONLY) Dehumidification is enabled/disabled via an on-board dipswitch. The DX16TC and DX18TC ComfortNet ready air conditioner Features models are factory equipped with an outdoor air temperature The new air handler control includes advanced diagnostic...
  • Page 87 SERVICING Electric Heat Sequencer Outputs Do the following to measure the voltages on the communications data lines. WARNING WARNING HIGH VOLTAGE Disconnect ALL power before servicing or installing Line Voltage now present. this unit. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death.
  • Page 88 SERVICING This leads to a somewhat non-traditional manner in which the thermostat. The fan demand provided by the thermostat system components receive commands for system operation. All will be 30%, 50%,or 70% of the air handler’s maximum system commands are routed from the component through the airflow capability.
  • Page 89 SERVICING 1.4 The system operates at low stage cooling. heating operation. The compressor and outdoor fan motor 1.5 If the thermostat demand cannot be met on low stage are de-energized. cooling, the CTK0* thermostat sends a request for high stage The air handler/modular blower is commanded to end cooling to the heat pump.

  • Page 90: Electric Heater (Optional Item)

    SERVICING 4.4 Once the defrost cycle is terminated, the heat pump EXAMPLE: Five (5) heaters provide 24.0 KW at the rated commands the air handler/modular blower to end defrost 240V. Our actual measured voltage is 220V, and our measured operation. temperature rise is 42°F.

  • Page 91: S-61A Checking Heater Limit Control(S)

    SERVICING S-61A CHECKING HEATER LIMIT CONTROL(S) S-100 REFRIGERATION REPAIR PRACTICE Each individual heater element is protected with a limit control DANGER device connected in series with each element to prevent overheating of components in case of low airflow. This limit Always remove the refrigerant charge in a proper manner before control will open its circuit at approximately 150°F.

  • Page 92: Leak Testing (Nitrogen Or Nitrogen-Traced)

    SERVICING S-101 LEAK TESTING (NITROGEN OR NOTE: Never use the Scroll compressor as a vacuum pump or run when under a high vacuum. Motor damage could occur. NITROGEN-TRACED) Condensing unit liquid and suction valves are closed to contain WARNING the charge within the unit. The unit is shipped with the valve stems closed and caps installed.

  • Page 93: Charging

    SERVICING S-103 CHARGING When opening valves with retainers, open each valve only until the top of the stem is 1/8” from the retainer. To avoid loss of refrigerant, DO NOT apply pressure to the retainer. When WARNING opening valves without a retainer remove service valve cap and insert a hex wrench into the valve stem and back out the stem by REFRIGERANT UNDER PRESSURE! turning the hex wrench counterclockwise.

  • Page 94: Checking Compressor Efficiency

    SERVICING S-107 UNDERFEEDING NOTE: Do NOT adjust the charge based on suction pressure unless there is a gross undercharge. Underfeeding by the expansion valve results in low system 4. Disconnect manifold set, installation is complete. capacity and low suction pressures. SUBCOOLING FORMULA = SATURATED LIQUID TEMP.

  • Page 95: Checking Subcooling

    SERVICING S-110 CHECKING EXPANSION VALVE OPERATION EXAMPLE: A. Suction Pressure = 143 B. Corresponding Temp. °F. = 50 1. Remove the remote bulb of the expansion valve from the C. Thermometer on Suction Line = 61°F. suction line. 2. Start the system and cool the bulb in a container of ice To obtain the degrees temperature of superheat, subtract 50.0 water, closing the valve.

  • Page 96: Non-Condensables

    SERVICING If this system is observed: 1. Start the system. 2. Remove and capture small quantities of gas from the suction line dill valve until the head pressure is reduced to normal. 3. Observe the system while running a cooling performance test.
  • Page 97 SERVICING Pressure vs. Temperature Chart R-410A PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F -37.7 114.0 37.8 216.0 74.3 318.0 100.2 420.0 120.7 522.0 137.6 -34.7 116.0 38.7 218.0 74.9 320.0 100.7 422.0 121.0 524.0 137.9 -32.0 118.0 39.5...
  • Page 98 SERVICING REQUIRED LIQUID LINE TEMPERATURE LIQUID PRESSURE REQUIRED SUBCOOLING TEMPERATURE (°F) AT SERVICE VALVE (PSIG)

  • Page 99: Compressor Burnout

    SERVICING S-115 COMPRESSOR BURNOUT 1. Remove compressor discharge line strainer. 2. Remove the liquid line drier and expansion valve. 3. Purge all remaining components with dry nitrogen or When a compressor burns out, high temperature develops carbon dioxide until clean. causing the refrigerant, oil and motor insulation to decompose 4.

  • Page 100: Single Piece Air Handler External Static Pressure

    SERVICING AIR HANDLER STATIC PRESSURE READINGS S-203A TWO PIECE AIR HANDLER EXTERNAL STATIC PRESSURE S-203 SINGLE PIECE AIR HANDLER EXTERNAL STATIC PRESSURE To determine proper airflow, proceed as follows: 1. Using a Inclined Manometer or Magnehelic gauge, To determine proper airflow, proceed as follows: measure the static pressure between the outlet of the 1.
  • Page 101 TROUBLESHOOTING AC - NO COOL Troubleshooting AC - No Cool No Cool Wiring to Compressor Contactor Repair or Replace Wiring Compressor Running Open Run Capacitor Replace Capacitor Good Compressor Compressor Check for Stuck Compressor Overload Windings Open Open Replace Compressor Compressor Replace Compressor Warm to...
  • Page 102 TROUBLESHOOTING HEAT PUMP - NO COOL Troubleshooting Heat Pump - No Cool No Cool Wiring to Compressor Contactor Repair or Replace Wiring Compressor Running Open Run Capacitor Replace Capacitor Good Compressor Compressor Check for Stuck Compressor Overload Windings Open Open Replace Compressor Compressor Replace Compressor...
  • Page 103 TROUBLESHOOTING HEAT PUMP - NO COOL Troubleshooting Heat Pump - No Cool Repair or replace Metering Metering Device Device Working Properly Check for proper charge. Check subcooling and/or superheat Check voltage 2nd Stage Check wires and voltage at to 2nd stage Operating control board solenoid...
  • Page 104 TROUBLESHOOTING ERROR CODE - 01, L1 Troubleshooting Error Code - 01, L1 Error Code: Board is 01, L1 - Low pressure cutout reading 01, L1 Applicable Models: Outdoor units Check the Check voltage wires and get an resistance of low electrical company involved if pressure switch, is necessary...
  • Page 105 TROUBLESHOOTING ERROR CODE - 02, L2 Troubleshooting Error Code - 02, L2 Error Code: Board is 02, L2 - High side fault reading 02, L2 Applicable Models: Outdoor units Check the resistance of high Cycle power pressure switch, is it open? Method of Error Detection: Integrated control module LED display provides the indicated...
  • Page 106 TROUBLESHOOTING ERROR CODE - 03 Troubleshooting Error Code - 03 Error Code: Board is 03 - Short cycling reading 03 Applicable Models: Outdoor units Check voltage wires and get an Verify low voltage electrical company involved if between R-Y. Does necessary it fluctuate from 24v to 0?
  • Page 107 TROUBLESHOOTING ERROR CODE - 04 Troubleshooting Error Code - 04 Error Code: Board is 04 - Locked rotor reading 04 Applicable Models: Outdoor units Check voltage wires and get an Is the high voltage electrical company involved if to the system within necessary our specified parameters?
  • Page 108 TROUBLESHOOTING ERROR CODE B0 & B1 Troubleshooting Error Code B0 & B1 Error Code: Board Flashes B0 - Blower motor not running B0 & B1 B1 - Blower motor communication error Check wiring harness and wiring connections. Correct loose wiring issue. OHM motor for open or shorted circuit.
  • Page 109 TROUBLESHOOTING ERROR CODE - B2-B6, B9 Troubleshooting Error Code - B2-B6, B9 Error Code: Board flashes B2 - Blower motor operating in B2-B6 or B9 power, temp or speed limiting conditions B3 - Circulating blower motor is operating in a power, temperature, Does the air or speed limiting condition Verify correct motor horsepower.
  • Page 110 TROUBLESHOOTING ERROR CODE - D0, D1, D4 Troubleshooting Error Code - D0, D1, D4 Error Code: D0 - Data not yet on network (No Does the board Check to see if the fuse is good, net data) flash D0, D1, or if not replace D1 - Invalid data on network (Invalid data)
  • Page 111 TROUBLESHOOTING ERROR CODE - d2 Troubleshooting Error Code - d2 Error Code: Board Flashes d2 - System mismatch Applicable Models: Outdoor AC Outdoor HP Is the outdoor unit and indoor unit Replace to certified combination combination in AHRI website? Methof of Error Detection: Communication data from indoor Make sure the airflow trim unit...
  • Page 112 TROUBLESHOOTING ERROR CODE - E5 Troubleshooting Error Code - E5 Error Code: Board is E5 - Open Fuse reading E5 Applicable Models: Outdoor units Does the fuse Indoor units Replace the fuse have good continuity? Method of Error Detection: Integrated control module LED display provides the indicated error code Does the low...
  • Page 113 TROUBLESHOOTING ERROR CODE - EC Troubleshooting Error Code - EC Error Code: Board Flashes EC - Heater too large / Heater too small / No heater match Verify the installed Applicable Models: electric heater is valid for Indoor units the air handler blower. Check name plate or specification sheet Methof of Error Detection:...
  • Page 114 TROUBLESHOOTING ERROR CODE - EE Troubleshooting Error Code - EE Error Code: Board is EE - Board misoperation reading EE Applicable Models: Outdoor units Are all of the Turn off power, correct them, wires landed and power the system back on on the correct terminals? Method of Error Detection:...
  • Page 115 TROUBLESHOOTING ERROR CODE - H8 Troubleshooting Error Code - H8 Error Code: Board is H8 - High line voltage reading H8 Applicable Models: Outdoor units Is the voltage to the system within Replace the board our specified parameters? Method of Error Detection: Integrated control module LED display provides the indicated Check voltage wires and get an...
  • Page 116 TROUBLESHOOTING ERROR CODE - L8 Troubleshooting Error Code - L8 Error Code: Board is L8 - Low line voltage reading L8 Applicable Models: Outdoor units Check voltage wires and get an Is the high voltage electrical company involved if to the system within necessary our specified parameters?

  • Page 117: Wiring Diagrams

    WIRING DIAGRAMS HIGH VOLTAGE! ISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT ULTIPLE POWER SOURCES MAY BE PRESENT AILURE TO DO SO MAY CAUSE PROPERTY DAMAGE PERSONAL INJURY OR DEATH 40 VA TRANSFORMER, SEE NOTE 1 230 VAC GRND GRND 208 VAC 24 VAC...
  • Page 118 WIRING DIAGRAMS DV**PTC/MBVC HIGH VOLTAGE! ISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT ULTIPLE POWER SOURCES MAY BE PRESENT AILURE TO DO SO MAY CAUSE PROPERTY DAMAGE PERSONAL INJURY OR DEATH 40 VA TRANS FORMER, SEE N OTE 1 230 VAC GRND GRND...
  • Page 119 WIRING DIAGRAMS 3-PHASE HEAT KIT Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 120 WIRING DIAGRAMS DX16TC Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 121 WIRING DIAGRAMS DX18TC, DX7TC Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 122 WIRING DIAGRAMS DZ18TC, DZ7TC Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.

This manual is also suitable for:

Comfortnet dx16tcComfortnet dx18tcComfortnet dz7tcComfortnet dz16tcComfortnet dz18tc

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