Carrier 69NT20-531-300 manual Supply is compared, Test fails, P6-2, Crease, the test fails, P6-7

Page 47

Table 3-7 Controller Pre-Trip Test Codes (Sheet 2 of 4)

 

 

Requirements: For units equipped with secondary supply probe only.

 

 

Pass/Fail Criteria: The temperature difference between primary and secondary probe

 

 

(supply) is compared.

P5-1

Supply Probe Test

NOTE

 

 

If this test fails, “P5-1” and FAIL will be displayed. If both Probe tests (this

 

 

and the SUPPLY/ RETURN TEST) pass, because of the multiple tests, the

 

 

display will read ’P 5’ ’PASS’.

 

 

 

 

 

Requirements: For units equipped with secondary return probe only.

 

 

Pass/Fail Criteria: The temperature difference between primary and secondary

 

 

probe (return) is compared.

 

 

NOTES

P5-2

Return Probe Test

1. If this test fails, “P5-2” and “FAIL” will be displayed. If both Probe tests

 

 

(this test and the SUPPLY/ RETURN) pass, because of the multiple

 

 

tests, the display will read “P 5,” “PASS.”

 

 

2. The results of Pre-Trip tests 5-0, 5-1 and 5-2 will be used to activate or

 

 

clear control probe alarms.

 

 

Setup: The system is operated through a sequence of events to test the compo-

 

Refrigerant Probes,

nents. The sequence is: Step 1, de-energize all outputs; Step 2, start unit with

P6

Compressor

unloader valve open. Open then close the suction modulation valve. Monitor

suction pressure; Step 3, open suction modulation valve to a known position;

and

 

Step 4, close suction modulation valve to a know position; Step 5, open econo-

 

Refrigeration valves

 

 

mizer valve; Step 6, close unloader valve; Step 7, open unloader valve; Step 8,

 

 

close economizer valve; Step 9, de-energize all outputs.

P6-0

Discharge

If alarm 64 is activated any time during the first 45 second period of Step 1, the

Thermistor Test

test fails.

 

P6-1

Suction

If alarm 69 is activated any time during the first 45 second period of Step 1, the

Thermistor Test

test fails.

 

P6-2

Discharge Pressure

If alarm 65 is activated any time during the first 45 second period of Step 1, the

Sensor Test

test fails.

 

P6-3

Suction Pressure

If alarm 66 is activated any time during the first 45 second period of Step 1, the

Sensor Test

test fails.

 

P6-4

Compressor Current

Compressor current is tested before and after start up. If current does not in-

Draw Test

crease, the test fails.

 

P6-5

Suction Modulation

Suction pressure is measured before and after the valve opens. If suction pres-

Valve Test

sure does not increase, the test fails.

 

P6-6

Economizer

Suction pressure is measured during Steps 4 and 5. If suction pressure does not

Valve Test

increase, the test fails.

 

P6-7

Unloader Valve Test

Suction pressure is measured during Steps 6 and 7. If suction pressure does not

 

 

increase, the test fails.

T-309

3-22

Page 46 Page 48
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Page 46 Page 48
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 startedBy 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 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 Removing the Expansion Valve Two expansion valves are used, the evaporatorWrapped with Insulating compound. See 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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