Carrier 69NT20-531-300 manual Unit PRE-TRIP Diagnostics

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e. “END” is displayed to indicate the end of the alarm list if any alarms are active.

f.“CLEAr” is displayed if all alarms are inactive. The alarm queue may than be cleared by pressing the EN- TER key. The alarm list will clear and “----------” will be displayed.

3.5. UNIT PRE-TRIP DIAGNOSTICS

Pre-Trip Diagnostics is an independent controller function which will suspend normal refrigeration controller activities and provide preprogrammed test routines. The test routines include Auto Mode testing, which automatically preforms a pre programmed sequenced of tests, or Manual Mode testing, which allows the operator to select and run any of the individual tests.

CAUTION

Pre-trip inspection should not be performed with critical temperature cargoes in the con- tainer.

CAUTION

When Pre-Trip key is pressed, economy, de- humidification and bulb mode will be deac- tivated. At the completion of Pre-Trip activi- ty, economy, dehumidification and bulb mode must be reactivated.

Testing may be initiated by use of the Key Pad or via communication, but when initiated by communication the controller will execute the entire battery of tests (auto mode).

At the end of a pre-trip test, the message “P,” “rSLts” (pretest results) will be displayed. Pressing the ENTER key will allow the user to see the results for all subtests. The results will be displayed as “PASS” or “FAIL” for all the tests run to completion.

A detailed description of the pre-trip tests and test codes is provided in Table 3-7. detailed operating instructions are provided in paragraph 4.7.

3.6DataCORDER 3.6.1 Description

The Carrier Transicold “DataCORDER,” software is integrated into the controller and serves to eliminate the temperature recorder and paper chart. The DataCORDER functions may be accessed by key pad selections and viewed on the display module. The unit is also fitted with interrogation connections (see Figure 3- 1) which may be used with the Carrier Transicold Data Reader to down load data. A personal computer with Carrier Transicold Data View software may also be used to download data and configure settings. The DataCORDER consists of:

Configuration Software

Operational Software

Data Storage Memory

Real Time Clock (with internal battery backup) Six thermistor inputs

Interrogation Connections Power supply (battery pack).

The DataCORDER performs the following functions:

a. Logs data at 15, 30, 60 or 120 minute intervals and stores two years’ of data (based on one hour interval).

b. Records and displays alarms on the display module.

c.Records results of pre-trip testing.

d.Records DataCORDER and temperature control soft- ware generated data and events as follows: Container ID Change

Software Upgrades

Alarm Activity

Battery Low (Battery Pack) Data Retrieval

Defrost Start and End Dehumidification Start and End Power Loss (w/wo battery pack) Power Up (w/wo battery pack)

Remote Probe Temperatures in the Container (USDA Cold treatment and Cargo probe recording)

Return Air Temperature Set Point Change Supply Air Temperature

Real Time Clock Battery (Internal Battery) Replace- ment

Real Time Clock Modification Trip Start

ISO Trip Header (When entered via Interrogation program)

Economy Mode Start and End

“Auto 2” Pre-Trip Start and End Bulb Mode Start

Bulb Mode changes Bulb Mode End USDA Trip Comment Humidification Start and End USDA Probe Calibration

3.6.2 DataCORDER Software

The DataCORDER Software is subdivided into the Configuration Software, Operational Software and the Data Memory.

a. Operational Software

The Operational Software reads and interprets inputs for use by the Configuration Software. The inputs are labeled Function Codes. There are 35 functions (see Table 3-8) which the operator may access to examine the current input data or stored data. To access these codes, do the following:

1Press the ALT. MODE & CODE SELECT keys.

2Press an arrow key until the left window displays the desired code number. The right window will display the value of this item for five seconds before return- ing to the normal display mode.

3If a longer time is desired, press the ENTER key to extend the time to 30 seconds.

3-7

T-309

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Contents Service Model Safety Summary 309 Safety-2 Safety-3 309 Table of Contents Table of Contents Connect Remote Monitoring Check Controller Function CodesValve Replacement Evaporator Coil Replacement Evaporator Heater ReplacementReplacing The Evaporator Fan Assembly Precheck Procedure Checking The Stepper valveElectrical Wiring Schematic Refrigeration Circuit Schematic Standard Operation Refrigeration Circuit Schematic Economized OperationDataCORDER Configuration Variables List of TablesSection Introduction Unit is fitted with a scroll compressorManual, T-300 Section Description Evaporator Section Compressor Section Condenser Section Module which allow communication with a master Communications interface module For further informationModel RSH105 Weight Dry 46.5 kg 103 lb TemperatureApproved Oil Mobil ST32 Oil Charge 2957 ml 100 ounces Oil level range, with the compressor offElectrical Data Safety and Protective Devices Refrigeration Circuit 2.5.1 Standard Operation Standard Operation with Receiver Refrigeration Circuit Schematic -- Economized Operation Temperature Control System Section MicroprocessorKEY Function Controller Software Modes of Operation Perishable Mode -- Economy Controller Alarms Unit PRE-TRIP Diagnostics Thermistor inputssupply & return DCF02=2DCF02=5 Usda thermistor inputs DCF02=6Standard Configuration Download Report Raw Data Report for ABC1234567DataCORDER may be powered up in any one of four ways Logging Interval dCF03DataView DataCORDER Alarms CnF11 Defrost Off Selection NoOFF Std, FullCnF33 Snap Freeze Option SnAPDisplay Only Functions Defrost temperature sensor reading is displayed Possibly delaying a needed defrost cycleSensor Reading Plicable with frozen set pointsController Function Codes Sheet 3 Controller Alarm Indications Sheet 1 Controller Alarm Indications Sheet 2 Controller Alarm Indications Sheet 3 Error Description Memory failureDraw test is done after 15 seconds P1-1Draw test is done after 10 seconds OndsSupply is compared Test failsP6-2 Crease, the test failsPressure switch is open or the condenser fan switch is open Timer is startedDenser fan is started and a 60 second timer is started Requirements Control temperature must be at least 15.6C 60FBy starting P10-0 over Requirements Control temperature must be at least 7.2C 45FSet point, the test proceeds to test Inapplicable Functions Display Title Data 10 DataCORDER Alarm Indications Operation 69NT Fresh AIR MakeupWill be displayed To start a pre-trip test, do the followingWill be displayed Controller Operation -- Perishable Mode Pull Down Falling RisingController Operation -- Frozen Mode Frozen Mode Defrost Section Troubleshooting Unit will not heat or has insuffi Will not initiate defrost Bent motor shaftSuperheat Unit reads abnormal currents Current sensor wiring Check Section Service Valve Frontseated BackseatedCompressor 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 Removing the Expansion Valve Two expansion valves are used, the evaporatorWrapped with Insulating compound. See Cleaned regularly. The preferred cleaning fluid is fresh If applicable, braze the equalizer connection toEqualizer line Check superheat refer to stepStart unit and check operation 14. Unloader Solenoid ValveEvaporator FAN Motor Capacitors Valve Override Controls Precheck Procedure TP1 Mounting Stud Type Cut wires 5 cm 2 inches from shoulder of defec Cut one wire of existing cable 40 mm 1-1/2 inchShorter than the other wire Cut one replacement sensor wire opposite colorMaintenance of Painted Surfaces 23 Door Hinge Repair Crack, Chip & Hole Repair Kit 24. Insert Location In-lbs #10 Ft-lbs 12.72 17.14 In-lbs Ft-lbs 13.99 18.8614.6 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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