Carrier 69NT20-531-300 manual Will be displayed

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3.Pre-trip may also be initiated via communications. The operation is the same as for the key pad initiation described below except that should a test fail, the pre-trip mode will automatically terminate. When initiated via communications, a test may not be interrupted with an arrow key, but the pre-trip mode can be terminated with the PRE-TRIP key.

a.Press the PRE-TRIP key. This accesses a test selec- tion menu.

b.TO RUN AN AUTOMATIC TEST: Scroll through the selections by pressing the UP ARROW or DOWN ARROW keys to display AUTO, AUTO 1 or AUTO 2 as desired and then press the AUTO key.

1.The unit will execute the series of tests without any need for direct user interface. These tests vary in length, depending on the component under test.

2.While tests are running, “P#-#” will appear on the left display, where the #’s indicate the test number and sub-test. The right display will show a countdown time in minutes and seconds, indicating how much time there is left remaining in the test.

CAUTION

When a failure occurs during automatic testing the unit will suspend operation awaiting operator intervention.

When an automatic test fails, it will be repeated once . A repeated test failure will cause “FAIL” to be shown on the right display, with the corresponding test num- ber to the left. The user may then press the DOWN ARROW to repeat the test, the UP ARROW to skip to the next test or the PRE-TRIP key to terminate test- ing. The unit will wait indefinitely, until the user manually enters a command.

CAUTION

When Pre-Trip test Auto 2 runs to comple- tion without being interrupted, the unit will terminate pre-trip and display “Auto 2” “end.” The unit will suspend operation until the user depresses the ENTER key!

When an Auto 1 runs to completion without a failure, the unit will exit the pre-trip mode, and return to nor- mal control operation. However, dehumidification and bulb mode must be reactivated manually if re- quired.

c. TO RUN AN INDIVIDUAL TEST: Scroll through the selections by pressing the UP ARROW or DOWN ARROW keys to display an individual test code. Pressing ENTER when the desired test code is displayed.

1.Individually selected tests, other than the LED/Dis- play test, will perform the operations necessary to verify the operation of the component. At the con- clusion, PASS or FAIL will be displayed. This mes- sage will remain displayed for up to three minutes, during which time a user may select another test. If

the three minute time period expires, the unit will terminate pre-trip and return to control mode opera- tion.

2.While the tests are being executed, the user may ter- minate the pre-trip diagnostics by pressing and hold- ing the PRE-TRIP key. The unit will then resume normal operation. If the user decides to terminate a test but remain at the test selection menu, the user may press the UP ARROW key. When this is done all test outputs will be de-energized and the test selection menu will be displayed.

3.Throughout the duration of any pre-trip test except the P-7 high pressure switch tests, the current and pressure limiting processes are active .

d. Pre-Trip Test Results

At the end of the pre-trip test selection menu, the message “P,” “rSLts” (pre-trip results) will be displayed. Pressing the ENTER key will allow the user to see the results for all subtests (i.e., 1-0, 1-1, etc). The results will be displayed as “PASS” or “FAIL” for all the tests run to completion since power up. If a test has not

been run since power up, “----------

” will be displayed.

Once all pre-test activity

is completed,

dehumidification and bulb mode must be reactivated manually if required.

4.8OBSERVE UNIT OPERATION 4.8.1 Probe Check

If the DataCORDER is off or in alarm the controller will revert to a four probe configuration which includes the DataCORDER supply and return air probes as the secondary controller probes. The controller continuously performs probe diagnosis testing which compares the four probes. If the probe diagnosis result indicates a probe problem exists, the controller will perform a probe check to identify the probe(s) in error.

a. Probe Diagnostic Logic - Standard

If the probe check option (controller configuration code CnF31) is configured for standard, the criteria used for comparison between the primary and secondary control probes is:

1_C (1.8_F) for perishable set points or 2_C (3.6_F) for frozen set points.

If 25 or more of 30 readings taken within a 30 minute period are outside of the limit, then a defrost is initi- ated and a probe check is performed.

In this configuration, a probe check will be run as a part of every normal (time initiated) defrost.

b. Probe Diagnostic Logic - Special

If the probe check option is configured for special the above criteria are applicable. A defrost with probe check will be initiated if 25 of 30 readings or 10 consecutive readings are outside of the limits

In this configuration, a probe check will not be run as a part of a normal defrost, but only as a part of a defrost initiated due to a diagnostic reading outside of the limits.

c.The 30 minute timer will be reset at each of the follow- ing conditions:

4-3

T-309

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Contents Service Model Safety Summary 309 Safety-2 Safety-3 309 Table of Contents Table of Contents Check Controller Function Codes Connect Remote MonitoringPrecheck Procedure Checking The Stepper valve Valve ReplacementEvaporator Coil Replacement Evaporator Heater Replacement Replacing The Evaporator Fan AssemblyElectrical Wiring Schematic Refrigeration Circuit Schematic Economized Operation Refrigeration Circuit Schematic Standard OperationList of Tables DataCORDER Configuration VariablesUnit is fitted with a scroll compressor Section IntroductionManual, T-300 Section Description Evaporator Section Compressor Section Condenser Section Communications interface module For further information Module which allow communication with a masterOil level range, with the compressor off Model RSH105 Weight Dry 46.5 kg 103 lbTemperature Approved Oil Mobil ST32 Oil Charge 2957 ml 100 ouncesElectrical Data Safety and Protective Devices Refrigeration Circuit 2.5.1 Standard Operation Standard Operation with Receiver Refrigeration Circuit Schematic -- Economized Operation Section Microprocessor Temperature Control SystemKEY Function Controller Software Modes of Operation Perishable Mode -- Economy Controller Alarms Unit PRE-TRIP Diagnostics DCF02=6 Thermistor inputssupply & returnDCF02=2 DCF02=5 Usda thermistor inputsRaw Data Report for ABC1234567 Standard Configuration Download ReportLogging Interval dCF03 DataCORDER may be powered up in any one of four waysDataView DataCORDER Alarms SnAP CnF11 Defrost Off Selection NoOFFStd, Full CnF33 Snap Freeze OptionDisplay Only Functions Plicable with frozen set points Defrost temperature sensor reading is displayedPossibly delaying a needed defrost cycle Sensor ReadingController Function Codes Sheet 3 Controller Alarm Indications Sheet 1 Controller Alarm Indications Sheet 2 Controller Alarm Indications Sheet 3 Memory failure Error DescriptionOnds Draw test is done after 15 secondsP1-1 Draw test is done after 10 secondsCrease, the test fails Supply is comparedTest fails P6-2Requirements Control temperature must be at least 15.6C 60F Pressure switch is open or the condenser fan switch is openTimer is started Denser fan is started and a 60 second timer is startedSet point, the test proceeds to test Requirements Control temperature must be at least 7.2C 45FBy starting P10-0 over Inapplicable Functions Display Title Data 10 DataCORDER Alarm Indications 69NT Fresh AIR Makeup OperationTo start a pre-trip test, do the following Will be displayedWill be displayed Pull Down Falling Rising Controller Operation -- Perishable ModeController Operation -- Frozen Mode Frozen Mode Defrost Section Troubleshooting Unit will not heat or has insuffi Bent motor shaft Will not initiate defrostSuperheat Unit reads abnormal currents Current sensor wiring Check Valve Frontseated Backseated Section ServiceCompressor in a deep vacuum, internal dam- age will result Refrigerant Leak Checking Remove all refrigerant using a refrigerant recovery system Refrigerant Charge Compressor Upper Mounting Compressor OIL Level Condenser FAN and Motor Assembly Wrapped with Insulating compound. See Two expansion valves are used, the evaporatorRemoving the Expansion Valve Check superheat refer to step Cleaned regularly. The preferred cleaning fluid is freshIf applicable, braze the equalizer connection to Equalizer line14. Unloader Solenoid Valve Start unit and check operationEvaporator FAN Motor Capacitors Valve Override Controls Precheck Procedure TP1 Mounting Stud Type Cut one replacement sensor wire opposite color Cut wires 5 cm 2 inches from shoulder of defecCut one wire of existing cable 40 mm 1-1/2 inch Shorter than the other wireMaintenance of Painted Surfaces 23 Door Hinge Repair Crack, Chip & Hole Repair Kit 24. Insert Location In-lbs Ft-lbs 13.99 18.86 In-lbs #10 Ft-lbs 12.72 17.1414.6 49.4 37.08 12.3 41.6 31.25 32.8 24.64 22.7 17.00 11.9 Section Electrical Wiring Schematic Schematic Diagram Wiring Diagram Sheet 1 Wiring Diagram Sheet 2 Index 309 Index-2

69NT20-531-300 specifications

The Carrier 69NT20-531-300 is a cutting-edge rooftop unit designed to meet the demanding requirements of commercial heating and cooling applications. This model embodies Carrier’s commitment to energy efficiency, reliability, and advanced technological features that enhance indoor comfort while minimizing operational costs.

One of the standout features of the Carrier 69NT20-531-300 is its high energy efficiency. It is equipped with advanced compressor technology that optimizes performance while reducing energy consumption. This ensures that businesses can maintain a comfortable indoor climate without incurring exorbitant utility bills. With a high Seasonal Energy Efficiency Ratio (SEER) and Energy Efficiency Ratio (EER), users can expect not only enhanced comfort but also significant cost savings over time.

The cooling capabilities of the 69NT20-531-300 are complemented by its robust heating options. This unit utilizes a gas heat exchanger, ensuring quick and even heating throughout the space. The combination of cooling and heating capabilities in one compact unit makes it a versatile choice for various applications, including retail spaces, offices, and warehouses.

In addition to its impressive performance specifications, the Carrier 69NT20-531-300 incorporates innovative technologies that further enhance its functionality. The unit comes with advanced controls, allowing for precise temperature regulation and zoning capabilities. This ensures that different areas of a building can maintain their desired temperatures based on usage, improving overall energy efficiency.

Durability is another hallmark of the Carrier 69NT20-531-300. The unit is constructed with high-quality materials and features a weather-proof cabinet that protects it from the elements, ensuring long-term reliability even in harsh conditions. Furthermore, its modular design simplifies maintenance, making it easy for technicians to access critical components.

The 69NT20-531-300 is also designed with low noise operation in mind. It employs sound-dampening technology to ensure that operations are quiet, making it an ideal choice for locations where noise reduction is a priority, such as schools or healthcare facilities.

Overall, the Carrier 69NT20-531-300 stands out as a premier choice for businesses looking for an efficient, reliable, and feature-rich rooftop HVAC unit. Its blend of energy efficiency, advanced technology, and durability positions it as a leader in commercial heating and cooling solutions, making it a valuable investment for any commercial property.
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