Daikin ComfortNet DX18TC Service Instructions Manual
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Daikin ComfortNet DX18TC Service Instructions Manual

Condensing units, split system heat pumps with r-410a refrigerant blowers, coils, & accessories
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Service Instructions
ComfortNet™
DX16TC & DX18TC Condensing Units,
DZ16TC & DZ18TC Split System Heat Pumps
with R-410A Refrigerant
Blowers, Coils, & Accessories
This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman
does not assume any responsibility for property damage or personal injury due to improper
RSD6200007
service procedures or services performed by an unqualified person.
November 2015
Copyright © 2015 Daikin Manufacturing Company, L.P.

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  • Page 1 This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not assume any responsibility for property damage or personal injury due to improper RSD6200007 service procedures or services performed by an unqualified person. November 2015 Copyright © 2015 Daikin Manufacturing Company, L.P.

  • Page 2: Table Of Contents

    INDEX IMPORTANT INFORMATION ......... 2 TROUBLESHOOTING CHART ........29 SERVICING TABLE OF CONTENTS ......29 PRODUCT ID ..............4 SERVICING ..............30 ACCESSORIES ............15 WIRING DIAGRAMS ........... 87 PRODUCT DESIGN ............ 21 SYSTEM OPERATION ..........24 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.

  • Page 3: Important Information

    IMPORTANT INFORMATION SAFE REFRIGERANT HANDLING While these items will not cover every conceivable situation, they should serve as a useful guide. WARNING WARNING EFRIGERANTS ARE HEAVIER THAN AIR. HEY CAN "PUSH OUT" THE O AVOID POSSIBLE EXPLOSION: OXYGEN IN YOUR LUNGS OR IN ANY ENCLOSED SPACE. O AVOID •...

  • Page 4: Product Id

    ComfortNet™ PRODUCT IDENTIFICATION 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 ComfortNet™ MB V C 12 Electrical Brand MB - Modular Blower 1: 208-230V/60Hz/1 PH Design Series Type A: First Series Speed Circuit Breaker Communication Feature A: No Circuit Breaker 4-Wire Communication Ready B: Circuit Breaker Factory Heat Airflow 1200 CFM 00 No Heat 1600 CFM...
  • Page 8 ComfortNet™ PRODUCT IDENTIFICATION 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 9 DX16TC D AIKIN BRAND X [AC] , 16 SEER, T WO STAGE COMPRESSOR , C OMNUNICATING Model/Rev Description Introduces Daikin brand 2-stage 16 SEER condensing units with R-410A, communicating DX16TC[024-060]1AA models. DX18TC D AIKIN BRAND X [AC] , 18 SEER, T WO STAGE COMPRESSOR , C OMNUNICATING...
  • Page 10 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. DZ18TC D AIKIN BRAND X [HP] , 18 SEER, T WO STAGE COMPRESSOR , C OMNUNICATING Model/Rev...
  • Page 11 PRODUCT IDENTIFICATION DV**PTC*14 SINGLE PIECE D AIKIN A IR HANDLER MULTIPLE-POSITION V ARIABLE SPEED P AINTED T XV WITH 4-WIRE C OMMUNICATING 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.
  • Page 12 PRODUCT IDENTIFICATION MBVC M ODULAR B LOWER MULTIPLE-POSITION V ARIABLE SPEED WITH 4-WIRE C OMMUNICATING CONTROL Model/Rev Description MBVC1200AA-1AA Initial release of module blower with variable seed blower motor with communicating MBVC1600AA-1AA control & serial communicating motor. MBVC2000AA-1AA MBVC1200AA-1AB Replaced Emerson motors (013M00111 and 013M00112) with motors013M00270 and MBVC1600AA-1AB 013M0071, respectively.
  • Page 13 PRODUCT IDENTIFICATION CAUF C- INDOOR COIL A- UPFLOW/DOWNFLOW U NCASED F LOW RATOR 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 components. CAUF*****6DB Drain pan material changed.
  • Page 14 PRODUCT IDENTIFICATION CSCF C- INDOOR COIL S- HORIZONTAL SLAB COIL C -UNPAINTED F LOWRATOR Model/Rev Description CSCF*****6AA Initial release of 13 SEER CSCF horizontal slab coils. Burr Oak Louvered Fin released in place of the Wavy Fin. Rows reduced by one where CSCF*****6BA applicable.

  • Page 15: Accessories

    ACCESSORIES DZ16TC / DZ18TC Model Description DZ16TC024 DZ16TC036 DZ16TC048 DZ16TC060 DZ18TC036 DZ18TC048 DZ18TC060 ABK-20 Anchor Bracket Kit TX2N41 TXV Kit TX3N41 TXV Kit TX5N41 TXV Kit CSR-U-1 Hard-start Kit CSR-U-2 Hard-start Kit CSR-U-3 Hard-start Kit FSK01A2 Fre eze Protect ion Kit Outdoor Thermostat/ OT18-60A3 Lockout Thermostat...
  • Page 16 ACCESSORIES EXPANSION VALVE KITS 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 SUPPLIED W/ KIT SEAL SUPPLIED W/ KIT SEAL DISTRIBUTOR EXPANSION VALVE BODY...
  • Page 17 ACCESSORIES FSK01A FREEZE THERMOSTAT Wire Nut Wire Nut Install Line Install Line Thermostat Thermostat Here Here Wire Nut Wire Nut...
  • Page 18 ACCESSORIES HK* SERIES ELETRIC HEAT KITS - ELECTRIC HEAT KIT APPLICATIONS - MBVC ELECTRIC HEAT KIT BLOWER M BVC1200AA-1** M BVC1600AA-1** M BVC2000AA-1** X = Allowable combinations ^ = Circuit 1: Single Phase for Air Handler Motor Circuit 2: 3-Phase for HKR3 Heater Kits - = Restricted combinations...
  • Page 19 ACCESSORIES ELECTRIC HEAT KIT APPLICATIONS - AVPTC MODELS HKR-03* HKR-05*/-05C* HKR-06* HKR-08*/-08C* HKR-10*/-10C* HKR-15C* HKR-20C* HKR-21C* HKA-15C* HKA-20C* AVPTC183014A* AVPTC313714A* AVPTC426014A* Revision level that may or may not be designated. Circuit breaker option. NOTE: When 8kW and 10kW heat kits are used with an AVPTC1830 and AVPTC3137, matched with 2- ton outdoor unit, see Note 1 below. Set Heater Kit dip switches 9, 10 and 11 to 6kW setting (9-ON, 10-OFF,11-ON) to obtain 840 CFM.
  • Page 20 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* * Revisio n level that may o r may no t be designated. Refer to the minimum airflo w requirements fo r each o f the heat kits.

  • Page 21: Product Design

    PRODUCT DESIGN This section gives a basic description of cooling unit opera- The ZPS two-step modulated scroll uses a single step of tion, its various components and their basic operation. unloading to go from full capacity to approximately 67% Ensure your system is properly sized for heat gain and loss capacity.
  • Page 22 PRODUCT DESIGN NOTE: Even though the compressor section of a Scroll UNLOADER SOLENOID compressor is more tolerant of liquid refrigerant, contin- A nominal 24-volt direct current coil activates the internal ued floodback or flooded start conditions may wash oil unloader solenoid. The input control circuit voltage must be from the bearing surfaces causing premature bearing 18 to 28 volt ac.
  • Page 23 PRODUCT DESIGN Communicating Unitary Control (UC) PCB speed condenser fan relays and the Active Protection com- ponent of enabled thermostats. The control is designed to The Communicating System Unitary Control PCB is a micro- work as part of a fully communicating HVAC system with 4 processor-based control for heat pump and air conditioning condensing units with single-phase compressors up to 5 ton wires.

  • Page 24: 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 cooling cycle. By energizing the reversing valve solenoid coil, 50:50 blend of R-32 and R-125.
  • Page 25 SYSTEM OPERATION Use the dipswitches to select defrost time interval (30, 60, 90 When the thermostat is satisfied, appropriate commands are or 120 minutes) See chart below 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.
  • Page 26 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 27 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 28: Troubleshooting Chart

    TROUBLESHOOTING CHART COOLING/HP ANALYSIS CHART Sys te m Uns atis factor y Com plaint No Cooling Ope r ating Cooling/He ating Pre s s ur e s P OSS IBLE CAUSE Te st Me thod DOTS IN ANALYSIS Re m e dy GUIDE INDICATE "P OSS IBLE CAUSE"...

  • Page 29: Servicing Table Of Contents

    SERVICING SERVICING TABLE OF CONTENTS CHECKING VOLTAGE ..........30 S-21 CHECKING REVERSING VALVE AND SOLENOID ..70 CHECKING WIRING ..........30 S-24 TESTING DEFROST CONTROL ......70 S-3E CTK0*** COMFORTNET THERMOSTAT ....30 S-26 TESTING TEMPERATURE SENSORS CHECKING TIME DELAY RELAY ....... 43 (COMFORTNET READY MODELS ONLY) ....

  • Page 30: Servicing

    SERVICING S-1 CHECKING VOLTAGE NOTE: When operating electric heaters on voltages other than 240 volts, refer to the System Operation section on 1. Remove outer case, control panel cover, etc., from unit electric heaters to calculate temperature rise and air flow. being tested.
  • Page 31 SERVICING This information may be displayed on the CT thermostat. The CTK0* WIRING indoor and outdoor units also interact with one another. The A removable plug connector is provided with the control to outdoor unit may send commands to or request information make thermostat wire connections.
  • Page 32 SERVICING CTK0* CTK0* Thermostat Thermostat CT Compatible CT Compatible Modular Blower Modular Blower Integrated Control Module Integrated Control Module 40VA Transformer (included in 40VA Transformer (included in CT Compatible CT Compatible CTK0*** kit) CTK0*** kit) 2 R C 2 R C AC/HP Integrated AC/HP Integrated Control Module...
  • Page 33 SERVICING Network Troubleshooting • Green receive communication LED – Indicates network traffic. 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 troubleshoot the network may arise.
  • Page 34 SERVICING 7 SEGMENT LED DES CRIPTION 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 35 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 36 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 37 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 38 SERVICING PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES...
  • Page 39 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...
  • Page 40 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...
  • Page 41 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...
  • Page 42 SERVICING PCBJA104 AIR HANDLER DIAGNOSTIC CODES...

  • Page 43: Checking Time Delay Relay

    SERVICING 3. Using an ohmmeter, check for continuity across termi- S-4 CHECKING TRANSFORMER AND CONTROL nals 3 and 1, and 4 and 5. CIRCUIT 4. Apply 24 volts to terminals H1 and H2. Check for continuity across other terminals - should test continu- ous.

  • Page 44: Checking High And Low Voltage S-61A To Ecm Motor

    SERVICING CHECKING RELAY CONTACTS - PSC FAN MOTOR S-9 CHECKING HIGH AND LOW VOLTAGE TO ECM MOTOR HIGH VOLTAGE! Disconnect ALL power before servicing HIGH VOLTAGE! or installing. Multiple power sources Disconnect ALL power before servicing may be present. Failure to do so may or installing.
  • Page 45 SERVICING The diagnostic tables on following pages provide detailed The Copeland Comfort Alert diagnostics are fully integrated information regarding the system symptons, indicators (LED into the unitary (UC) control. The UC control and integraged and thermostat), potential problem(s), and corrective ac- Comfort Alert™...
  • Page 46 PCBHR101-103 SERVICING PBBGR101-102...
  • Page 47 PCBHR101-103 SERVICING PBBGR101-102...
  • Page 48 PCBHR101-103 SERVICING PBBGR101-102...
  • Page 49 SERVICING PCBHR101-103 PBBGR101-102...
  • Page 50 PCBHR101-103 SERVICING PBBGR101-102...
  • Page 51 PCBHR104 SERVICING 7 SEGMENT LED 7 SEGMENT LED DESCRIPTION OF CONDITION (DS2) (DS1) Standby 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 52 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 53 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) your specific model.
  • Page 54 SERVICING PCBHR104 Air conditioner/heat pump Configuration 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). your specific model.
  • Page 55 SERVICING PCBHR104 Digit 3 Digit 2 Digit 1 Compressor and outdoor Low Pressure Low refrigerant Verify refrigerant Turn power OFF prior Cut Out charge. charge; adjust as to repair. Low pressure switch Lockout Restriction in needed. Must clear fault by trip 3 times within same (3 Trips) liquid line.
  • Page 56 SERVICING PCBHR104 Digit 3 Digit 2 Digit 1 Run time for last 4 cycles Short Cycling CMPR Intermittent Check thermostat Turn power OFF prior is less than 3 minutes SHRT thermostat and thermostat to repair. each. CYCLE demand. wiring; repair/ Fault will clear after 4 Compressor protector has Faulty...
  • Page 57 SERVICING PCBHR104 Digit 3 Digit 2 Digit 1 Compressor and outdoor Open Start Compressor start Check Turn power OFF prior Circuit START winding is open. compressor; to repair Low pressure and high Lockout Failed repair/replace as Must clear fault by pressure switches are compressor run needed.
  • Page 58 SERVICING PCBHR104 Digit 3 Digit 2 Digit 1 Air conditioner/heat High Line High line Correct high line Turn power OFF prior pump may appear to be Voltage VOLT voltage voltage condition; to repair. operating normally. contact local utility Control detects line Compressor protector if needed.

  • Page 59: Checking High Pressure Control

    SERVICING The low pressure control is designed to cut-out (open) at S-12 CHECKING HIGH PRESSURE CONTROL approximately 21 PSIG for heat pumps and 55 PSIG for air conditioners. It will automatically cut-in (close) at approxi- mately 50 PSIG for heat pumps and 95 PSIG for air condition- ers.

  • Page 60: S-15B Capacitance Check Using Adigital Multi-Meter (In Capacitance Mode)

    SERVICING 3. Digital meter will show a reading momentarily (Figure 1). 4. If the reading is near to the actual value of the capacitor Note the reading. (i.e. the printed value on the capacitor). The capacitor is good. (Note that the reading may be less than the actual printed value of the capacitor).
  • Page 61 SERVICING Emerson UltraCheck-EZ Diagnostic Tool Power Green Motor Indication(s) Button Action The Emerson UltraCheck-EZ diaganostic tool may be used to diagnose the ECM motor. Confirm 24VAC to UltraCheck-EZ tool. If 24VAC is confirmed, Rotating diagnostic tool is HIGH VOLTAGE! inoperable. Disconnect ALL power before servicing Motor and control/end or installing.
  • Page 62 SERVICING 4. Remove the (3) screws securing the control/end bell to the motor. Separate the control/end bell. Disconnect the 3- Lines 1 and 2 will be connected circuit harness from the control/end bell to remove the for 12OVAC Power Connector control/end bell from the motor.

  • Page 63: S-16H Ecm Cfm Adjustments Dvptc/Mbvc

    SERVICING 1. Disconnect power to air handler or modular blower. Ramping Profile Dipswitches - Used to select a comfort profile for the cooling mode. NOTE: Motor contains capacitors that can hold a charge for several minutes after disconnecting power. Wait 5 minutes after removing power to allow capacitors to discharge.
  • Page 64 SERVICING MBVC Airflow Table Htr Kw MBVC1200* MBVC16000* 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 Model...
  • Page 65 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 66 SERVICING Speed Selection Dip Switches Cooling/Heat Pump Airflow Table Low stage High stage Model Speed tap Cool Adjust Profile Continuous (CFM) (CFM) Selection Selection Selection Switches Switches Switches Speed DV24PTCB14 OFF OFF OFF OFF OFF 1125 OFF ON DV30PTCC14 1020 1225 Profiles Pre-Run...
  • Page 67 SERVICING ELECTRIC HEAT AIRFLOW TABLE DV42PTCD14A* DV48PTCD14A* DV60PTCD14A* Htr kW 11 DV24PTCB14A* DV30PTCC14A* DV36PTCC14A* DV48PTCC14* 850** 1250 1250 1250 ON OFF 1300 1300 1300 ON OFF ON 1000 1000 1500 1500 1500 ON OFF OFF OFF ON 1200 1200 1550 1550 1550 1440...

  • Page 68: Checking Compressor

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

  • Page 69: S-17C Unloader Test Procedure

    SERVICING 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 tube on the compressor).

  • Page 70: Testing Crankcase Heater (Optional Item)

    SERVICING S-21 CHECKING REVERSING VALVE AND SO- 1. Remove unit wiring from disconnect switch and wire a test LENOID cord to the disconnect switch. Occasionally the reversing valve may stick in the heating or NOTE: The wire size of the test cord must equal the line wire cooling position or in the mid-position.

  • Page 71: Testing Temperature Sensors (Comfortnet Ready Models Only)

    SERVICING Dehumidification is enabled/disabled via an on-board S-26 TESTING TEMPERATURE SENSORS dipswitch. (COMFORTNET READY MODELS ONLY) Features The DX16TC and DX18TC ComfortNet ready air condi- tioner models are factory equipped with an outdoor air The new air handler control includes advanced diagnostic temperature (OAT) sensor.
  • Page 72 SERVICING Electric Heat Sequencer Outputs WARNING Line Voltage now present. HIGH VOLTAGE! Data Line Voltage Troubleshooting and Bias Disconnect ALL power before servicing or installing. Multiple power sources Switches may be present. Failure to do so may cause property damage, personal injury Proper data voltage is essential to robust and reliable com- or death.
  • Page 73 SERVICING • It may be necessary to move bias switches on the 4. Turn both switches to “off” position. outdoor unit to achieve proper bias. If the switches 5. Plug in connector and turn on power and check DC need to be moved both switches must be moved. voltage between C and data 1 and C and data.
  • Page 74 SERVICING 2.2 The air handler control energizes the ECM blower motor NOTE: The individual subsystems will cease operation if the at the emergency heat speed. The electric heat se- request for operation is NOT refreshed after 5 minutes. This quencer outputs are also energized, thus energizing the is a built-in safe guard to prevent the possibility of runaway electric heaters.
  • Page 75 SERVICING 2.6 If the thermostat demand cannot be met on low stage heat 3.0 Continuous Fan Operation pump heating, the CTK0* thermostat sends a request for 3.1 With a demand for continuous fan operation, the CTK0* high stage heat pump heating to the heat pump. The heat thermostat sends a fan request to the integrated air pump in turn sends a request for high stage fan speed to handler control along with a fan demand.

  • Page 76: Electric Heater (Optional Item)

    SERVICING 5.3 The system operates at emergency heat. EXAMPLE: Five (5) heaters provide 24.0 KW at the rated 240V. Our actual measured voltage is 220V, and our 5.4 Once the thermostat demand is satisfied, the CTK0* measured temperature rise is 42°F. Find the actual CFM: thermostat commands the air handler/modular blower to end emergency heat operation.

  • Page 77: Checking Heater Limit Control(S)

    SERVICING FORMULAS: S-62 CHECKING HEATER ELEMENTS Heating Output = KW x 3413 x Corr. Factor WARNING Actual CFM = CFM (from table) x Corr. Factor Disconnect ALL power before servicing. BTUH = KW x 3413 1. Disassemble and remove the heating element. BTUH = CFM x 1.08 x Temperature Rise (T) 2.

  • Page 78: S--101 Leak Testing

    SERVICING NOTE: The use of a heat shield when brazing is recommended This is the most important part of the entire service procedure. to avoid burning the serial plate or the finish on the unit. Heat The life and efficiency of the equipment is dependent upon the trap or wet rags should be used to protect heat sensitive thoroughness exercised by the serviceman when evacuating components such as service valves and TXV valves.

  • Page 79: Charging

    SERVICING NOTE: R410A should be drawn out of the storage container or drum in liquid form due to its fractionation properties, but should be “Flashed” to its gas state before entering the LOW SIDE HIGH SIDE system. There is commercially available restriction devices GAUGE GAUGE that fit into the system charging hose set to accomplish this.

  • Page 80: Checking Compressor Efficiency

    SERVICING If the test shows: Units Equipped with Adjustable Expansion a. Below normal high side pressure. Valves should be charged by Subcooling and b. Above normal low side pressure. Superheat adjusted only if necessary. c. Low temperature difference across coil. 1.

  • Page 81: Checking Subcooling

    SERVICING 2. For best results, temporarily install a thermometer on the Add charge to raise subcooling. Recover charge to lower liquid line at the liquid line service valve and 4-6" from the subcooling. compressor on the suction line. Ensure the thermometer Subcooling Formula = Sat.

  • Page 82: Overcharge Of Refrigerant

    SERVICING S-113 OVERCHARGE OF REFRIGERANT S-114 NON-CONDENSABLES An overcharge of refrigerant is normally indicated by an If non-condensables are suspected, shut down the system excessively high head pressure. and allow the pressures to equalize. Wait at least 15 minutes. Compare the pressure to the temperature of the An evaporator coil, using an expansion valve metering device, coldest coil since this is where most of the refrigerant will be.
  • Page 83 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 38.7 74.9 100.7 121.0 137.9 116.0 218.0 320.0 422.0 524.0 -32.0 118.0 39.5...
  • Page 84 SERVICING REQUIRED LIQUID LINE TEMPERATURE LIQUID PRESSURE REQUIRED SUBCOOLING TEMPERATURE (°F) AT SERVICE VALVE (PSIG)

  • Page 85: Compressor Burnout

    SERVICING 6. Start up the unit and record the pressure drop across the S-115 COMPRESSOR BURNOUT drier. When a compressor burns out, high temperature develops causing the refrigerant, oil and motor insulation to decom- 7. Continue to run the system for a minimum of twelve (12) hours and recheck the pressure drop across the drier.

  • Page 86: Single Piece Air Handler External Static Pressure

    SERVICING S-203A TWO PIECE AIR HANDLER EXTERNAL Air Handler Static Pressure Readings STATIC PRESSURE S-203 SINGLE PIECE AIR HANDLER EXTERNAL To determine proper airflow, proceed as follows: STATIC PRESSURE 1. Using a Inclined Manometer or Magnehelic gauge, mea- To determine proper airflow, proceed as follows: sure the static pressure between the outlet of the evaporator coil and the inlet of the air handler, this will be a negative 1.

  • Page 87: Wiring Diagrams

    WIRING DIAGRAMS DV**PTC / MBVC 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. 40 VA TRANS FORMER, SEE N OTE 1 230 VAC GRND GRND...
  • Page 88 WIRING DIAGRAMS 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. 3-Phase Heat Kit Wiring is subject to change. Always refer to the wiring digram on the unit for the most up-to-date wiring.
  • Page 89 DX16TC WIRING DIAGRAMS 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. Wiring is subject to change. Always refer to the wiring digram on the unit for the most up-to-date wiring.
  • Page 90 WIRING DIAGRAMS DX18TC 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. Wiring is subject to change. Always refer to the wiring digram on the unit for the most up-to-date wiring.
  • Page 91 DZ16TC[024-048] WIRING DIAGRAMS 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. LVDR 0-RV C-RV HVDR Wiring is subject to change. Always refer to the wiring digram on the unit for the most up-to-date wiring.
  • Page 92 WIRING DIAGRAMS DZ16TC060 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. LVDR 0-RV C-RV HVDR Wiring is subject to change. Always refer to the wiring digram on the unit for the most up-to-date wiring.
  • Page 93 WIRING DIAGRAMS DZ18TC 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. Wiring is subject to change. Always refer to the wiring digram on the unit for the most up-to-date wiring.

This manual is also suitable for:

Comfortnet dx16tcComfortnet dz16tcComfortnet dz18tc

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