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Service and Troubleshooting
DC6 Commercial Split System 7.5 and 10 ton Condensing
Units, DH6 Commerical Split System 7.5 and 10 ton Heat
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 prop-
erty damage or personal injury due to improper service procedures
or services performed by an unqualified person.
Copyright © 2024
Pumps, DAQ Indoor Units with R-32 Refrigerant &
WARNING
Accessories
Do not bypass safety devices.
ALL MAINTENANCE STAFF AND OTHERS WORKING IN THE
LOCAL AREA SHALL BE INSTRUCTED ON THE NATURE OF
WORK BEING CARRIED OUT.
WORK IN CONFINED SPACES SHALL BE AVOIDED.
NO PERSON CARRYING OUT WORK IN RELATION TO A
REFRIGERATING SYSTEM WHICH INVOLVES EXPOSING ANY
PIPE WORK SHALL USE ANY SOURCES OF IGNITION IN SUCH A
MANNER THAT IT MAY LEAD TO THE RISK OF FIRE OR
EXPLOSION. ALL POSSIBLE IGNITION SOURCES, INCLUDING
CIGARETTE SMOKING, SHOULD BE KEPT SUFFICIENTLY FAR
AWAY FROM THE SITE OF INSTALLATION, REPAIRING,
REMOVING AND DISPOSAL, DURING WHICH REFRIGERANT CAN
POSSIBLY BE RELEASEDTO THE SURROUNDING SPACE. PRIOR
TO WORK TAKING PLACE, THE AREA AROUND THE EQUIPMENT
IS TO BE SURVEYED TO MAKE SURE THAT THERE ARE NO
FLAMMABLE HAZARDS OR IGNITION RISKS. "NO SMOKING"
SIGNS SHALL BE DISPLAYED.
WARNING
WARNING
WARNING
RSD6512301
November 2024
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Related Manuals for Daikin DC6
Summary of Contents for Daikin DC6
- Page 1 Service and Troubleshooting DC6 Commercial Split System 7.5 and 10 ton Condensing Units, DH6 Commerical Split System 7.5 and 10 ton Heat Pumps, DAQ Indoor Units with R-32 Refrigerant & Accessories WARNING WARNING Do not bypass safety devices. ONLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL, ADJUST, SERVICE, MAINTENANCE OR REPAIR (HEREINAFTER, “SERVICE”) THE EQUIPMENT SPECIFIED IN...
- Page 2 IMPORTANT INFORMATION IMPORTANT NOTICES TABLE OF CONTENTS Important Information ..........2 RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS System Operation ...........4 Outdoor Product Nomenclature ......5 Indoor Product Nomenclature ......6 WARNING Control Box Components ........9 Splits Low Voltage Diagram ......12 TO PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH, DO NOT STORE COMBUSTIBLE Servicing ..............15...
- Page 3 IMPORTANT INFORMATION General work area All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out. Work in confined spaces shall be avoided. WARNING Checking for presence of refrigerant The area shall be checked with an appropriate refrigerant To avoid possible injury, explosion or death, practice detector prior to and during work, to ensure the safe handling of refrigerants.
- Page 4 SYSTEM OPERATION Checks to electrical devices Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used.
- Page 5 OUTDOOR PRODUCT IDENTIFICATION NOMENCLATURE 6,7,8 Brand Minor Rev D - Daikin Type Major Revision C: Condenser R32 H: HP R-32 IEER Electrical 6: 16.0 - 16.4 3 - 208/230V Three-Phase 60Hz Compressor 4 - 460V Three-Phase 60HZ T: Two Stage...
- Page 6 INDOOR PRODUCT IDENTIFICATION NOMENCLATURE Brand Engineering* D - Daikin Major/Minor Revisions Product Type Electrical Refrigerant nit Applica onon 3 - R-32 Direct-Drive Motor Nominal Capacity Range 090 - 7½ tons 120 - 10 tons...
- Page 7 PRODUCT IDENTIFICATION Commercial Splits R-32 Outdoor Units Model/Rev Description DC6TE090 7.5 Ton AC Tandem Compressors DC6TE120 10 Ton AC Tandem Compressors DH6TE090 7.5 Ton HP tandem Compressors DH6TE120 10 Ton HP Tandem Compressors Commercial Splits R-32 Air Handler Model/Rev Description DAQ090 7.5 Ton Air Handler DAQ120...
- Page 8 This product is designed for zero inches (0 New R32 models DC6, and DH6 units are available in inches) clearance; however, adequate access for service or 7.5 and 10 ton sizes . They are designed for208/230 replacement must be considered without removing and 460 volt three phase applications.
- Page 9 CONTROL BOX COMPONENTS...
- Page 10 SYSTEM OPERATION...
- Page 11 SYSTEM OPERATION For heat pumps, during cooling cycle the reversing valve is Cooling Cycle energized as the room thermostat closes “O” terminal to R For legacy room thermostat: When the room thermostat and the defrost board responds to such a condition by calls for cool, the contacts of the room thermostat close energizing the solenoid coil on the reversing valve.
- Page 12 SPLITS LOW VOLTAGE DIAGRAM...
- Page 13 SYSTEM OPERATION Heating Cycle The reversing valve on the models is energized in the When the thermostat is satisfied, it opens its contacts, cooling cycle through the “O” terminal on the room breaking the low voltage circuit, causing the compressor thermostat.
- Page 14 CONTROL BOX COMPONENTS...
- Page 15 SERVICING Low voltage may cause insufficient heating. CHECKING VOLTAGE CHECKING WIRING 1. Remove outer case, control panel cover, etc., from unit being tested. WARNING With power ON: HIGH VOLTAGE WARNING Disconnect ALL power before servicing or installing this unit. Multiple power sources may be present.
- Page 16 THE FOLLOWING INSTRUCTIONS ARE MANDATORY FOR A2LSYSTEMS AND SUPERSEDE OTHER INSTRUCTIONS WARNING WARNING ALL ACCESSORIES THAT MAY BECOME A POTENTIAL ONLY BRAZING TECHNIQUES APPROVED MECHANICAL IGNITION SOURCE IF INSTALLED. SUCH AS ELECTRONIC JOINTS SHOULD BE USED TO CONNECT REFRIGERANT AIR CLEANERS, MUST ONLY BE POWERED THROUGH OUR TUBING CONNECTIONS.
- Page 17 PRODUCT DESCRIPTION When matched with DC6TE and DH6TE condensers, this system complies with the minimum efficiency requirements found in ASHRAE 90.1-2019. See the Daikin DC6TE and DH6TE specification sheets for details on these condensers. For other Daikin condenser(s) that can be matched with this air handler to obtain ASHRAE 90.1-2019...
- Page 19 When installing this unit in an area that may become wet, elevate the unit with a sturdy, non-porous material. In installations that may lead to physical damage (warehouse, industrial sites, etc.), it is advised to install a protective barrier to prevent such damage. NOTE: The maximum altitude shall not exceed 8,000 ft under normal operating conditions.
- Page 20 RETURN AIR FILTERS Each installation must include a return air filter. This unit is factory equipped with disposable return air filters. To ensure optimum performance, frequent filter replacement is advised. See the following table for the factory installed filter sizes. ELECTRIC HEAT Refer to this manual in combination with the instructions provided with the heat kit for the correct installation...
- Page 21 ELECTRICAL SUPPLY WIRE AND MOP WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO Determine Wire Size: The selection of the appropriate MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
- Page 22 Air Handler Only (Non-Heat Kit Models) MAXIMUM ALLOWABLE LENGTH IN FEET TO LIMIT Supply wire is to be routed through conduit from the VOLTAGE DROP TO 2% service disconnect box to the unit. The air handler is equipped with a knockout suitable for ¾” conduit. The following diagram illustrates the supply voltage hook-up.
- Page 23 The wires from the heat kit are to be routed through the pipe nipple into the air handler electrical compartment. See the “Electrical Connection” section of this manual for wiring details. Low Voltage Connections The 24V-control voltage connects the air handler to the Refrigerant Lines room thermostat and condenser.
- Page 24 Prior to resuming unit operation, ensure to reinstall the A2L Zone controller must be powered through a Daikin Zoning/ sensor. Accessory PCB to ensure that the Zoning Dampers open during mitigation mode to provide ventilation throughout all ducting.
- Page 25 flame or other ignition sources to accelerate this process. When oil is drained from a system, it shall be carried out safely. Servicing Measures for the Refrigerant Detection System: Before servicing, identify the mode of operation of the system by reading the LED flashing pattern through the view port in the cabinet panel and matching the LED flashing pattern with mode of operation in the REFRIGERANT DETECTION SYSTEM...
- Page 27 TROUBLESHOOTING CODE...
- Page 28 MOTOR REMOVAL NOTE: Disconnect and lockout/tagout any power source WARNING before performing motor/blower replacement. To service the motor: Disconnect ALL power before servicing. 1. Remove the split panel exposing the top of the blower housing. 1. Remove control panel cover, or etc., to gain access to 2.
- Page 29 SERVICING motor overloads. This control is automatically reset. Test 1. Testing High Pressure Control in Cooling Mode 1. Connect refrigerant gages to unit. 2. Disconnect power to outdoor unit. 3. Remove control panel cover. 4. Disconnect black wire from condenser fan motor (single stage units) or remove plug from control board on 2 stage units.
- Page 30 SERVICING sensor wire to the new PCB per wiring instruction as attached to the equipment, reassemble the blower access WARNING panel to the unit. HIGH VOLTAGE Instruction to replace R32 sensor: Disconnect ALL power before servicing Take off the blower access panel, coil access panel, and or installing this unit.
- Page 31 SERVICING Ignition cannot occur at the venting terminal without the High Voltage presence of contaminant air, and cannot occur externally from the venting terminal without the presence of an Connections external ignition source. 3/16" C L G N Therefore, proper evacuation of a hermetic system is essential at the time of manufacture and during servicing.
- Page 32 SERVICING OHMMETER COMP TESTING COMPRESSOR WINDINGS If either winding does not test continuous, replace the compressor. Compressor Ground Test NOTE: If an open compressor is indicated, allow ample WARNING time for the internal overload to reset before replacing compressor. Damage can occur to the glass embedded terminals if the leads are not properly removed.
- Page 33 SERVICING And the charge is correct. The compressor is faulty - Troubleshooting Mechanical Failures on a Reversing Valve by Pressure replace the compressor. S-21 Checking Reversing Valve And Solenoid 1. Troubleshooting the reversing valve can be done by Occasionally the reversing valve may stick in the pressure and temperature readings heating or cooling position or in the mid-position.
- Page 34 SERVICING 2. Visually inspect the heater assembly for any breaks in 5. Using VOM check for voltage across terminals “C & the wire or broken insulators. O”. Meter should read 24 volts. 3. Using an ohmmeter, test the element for continuity - 6.
- Page 35 SERVICING S-101 LEAK TESTING (NITROGEN OR NITROGEN-TRACED) DANGER Always remove the refrigerant charge in a proper WARNING manner before applying heat to the system, To avoid the risk of fire or explosion, never use oxygen, high pressure air or flammable gases for leak testing of When repairing the refrigeration system: a refrigeration system.
- Page 36 SERVICING NOTE: These are not back-seating valves. It is not Charging necessary to force the stem tightly against the rolled lip. Break vacuum by fully opening liquid service valve. WARNING After the refrigerant charge has bled into the system, open the suction service valve. The service valve cap is REFRIGERANT UNDER PRESSURE! •...
- Page 37 SERVICING NOTE: Charge should always be checked using superheat when using a piston and subcooling when using TXV equipped indoor coil to verify proper charge. Do not introduce liquid refrigerant from the cylinder into the crankcase of the compressor as this may damage the compressor.
- Page 38 SERVICING...
- Page 39 SERVICING is the Superheat value. Expansion Valve System 3. TXV-based systems should have a Superheat value NOTE: Units matched with indoor coils equipped with a as shown in the table below. TXV should be charged by Subcooling only. 4. Adjust Superheat by turning the TXV valve stem SUBCOOLING FORMULA = SATURATED LIQUID LINE clockwise to increase and counterclockwise to TEMPERATURE - LIQUID LINE TEMPERATURE...
- Page 40 SERVICING If this system is observed: Overfeeding 1. Start the system. Overfeeding by the expansion valve results in high suction 2. Remove and capture small quantities of gas from the pressure, cold suction line, and possible liquid slugging of suction line dill valve until the head pressure is reduced the compressor to normal.
- Page 41 SERVICING pulled off the evaporator coil causing condensate leakage. be installed as close to the compressor suction fitting as Too much air can also cause motor overloading and in possible. The filter must be accessible and be rechecked many cases this constitutes a poorly designed system. for pressure drop after the system has operated for a time.
- Page 42 SERVICING servicer. Situate the R-32 cylinder on the scale before k. Recovered refrigerant shall not be charged into another recovery takes place. Start the recovery machine and REFRIGERATING SYSTEM unless it has been operate in accordance with its instructions. Do not overfill cleaned and checked.
- Page 43 PRODUCT DESIGN...
- Page 44 PRODUCT DESIGN...
- Page 45 PRODUCT DESIGN...
- Page 46 PRODUCT DESIGN...
- Page 47 PRODUCT DESIGN...
- Page 48 PRODUCT DESIGN...
- Page 49 PRODUCT DESIGN...
- Page 50 WIRING DIAGRAMS DC6090/120 Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
- Page 51 WIRING DIAGRAMS DH6090/120 Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
- Page 52 WIRING DIAGRAMS DAQ6090/120 Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
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