Carrier 69NT20-531-300 Draw test is done after 15 seconds, P1-1, Onds, After 10 seconds, P5 Pass

Page 46

 

Table 3-7 Controller Pre-Trip Test Codes (Sheet 1 of 4)

 

 

 

Code

TITLE

DESCRIPTION

No.

 

 

 

 

NOTE

 

“Auto” or “Auto1” menu includes the: P0, P1, P2, P3, P4, P5, P6 and rSLts. “Auto2” menu

 

includes P0, P1, P2, P3, P4, P5, P6, P7, P8, P9, P10 and rSLts.

 

 

All lights and display segments will be energized for five seconds at the start of

P0-0

Pre-Trip Initiated

the pre-trip. Since the unit cannot recognize lights and display failures, there are

 

 

no test codes or results associated with this phase of pre-trip.

 

 

Setup: Heater must start in the OFF condition, and then be turned on. A current

P1-0

Heaters Turned On

draw test is done after 15 seconds.

 

 

Pass/Fail Criteria: Passes if current draw change is within the range specified.

 

 

Setup: Heater must start in the ON condition, and then be turned off. A current

P1-1

Heaters Turned Off

draw test is done after 10 seconds.

 

 

Pass/Fail Criteria: Passes if current draw change is within the range specified.

 

 

Requirements: Water pressure switch or condenser fan switch input must be

P2-0

Condenser Fan On

closed.

Setup: Condenser fan is turned ON, a current draw test is done after 15 seconds.

 

 

 

 

Pass/Fail Criteria: Passes if current draw change is within the range specified.

 

 

Setup: Condenser fan is turned OFF, a current draw test is done after 10 sec-

P2-1

Condenser Fan Off

onds.

 

 

Pass/Fail Criteria: Passes if current draw change is within the range specified.

P3

Low Speed Evapora-

Requirements: The unit must be equipped with a low speed evaporator fan, as

tor Fans

determined by the Evaporator Fan speed select configuration variable.

 

 

 

Setup: The high speed evaporator fans will be turned on for 10 seconds, then off

P3-0

Low Speed Evapora-

for two seconds, then the low speed evaporator fans are turned on. A current

draw test is done after 60 seconds.

 

tor Fan Motors On

Pass/Fail Criteria: Passes if change in current draw is within the range speci-

 

 

fied. Fails if AL11 or AL12 activates during test.

 

 

Setup: The low speed Evaporator Fan is turned off, a current draw test is done

P3-1

Low Speed Evapora-

after 10 seconds.

tor Fan Motors Off

Pass/Fail Criteria: Passes if change in current draw is within the range speci-

 

 

 

fied. Fails if AL11 or AL12 activates during test.

 

 

 

 

 

Setup: The high speed Evaporator Fan is turned on, a current draw test is done

P4-0

High Speed Evapo-

after 60 seconds.

rator Fan Motors On

Pass/Fail Criteria: Passes if change in current draw is within the range speci-

 

 

 

fied. Fails if AL11 or AL12 activates during test.

 

 

 

 

 

Setup: The high speed Evaporator Fan is turned off, a current draw test is done

P4-1

High Speed Evapo-

after 10 seconds.

rator Fan Motors Off

Pass/Fail Criteria: Passes if change in current draw is within the range speci-

 

 

 

fied. Fails if AL11 or AL12 activates during test.

 

 

 

 

 

Setup: The High Speed Evaporator Fan is turned on and run for eight minutes,

 

 

with all other outputs de-energized.

 

 

Pass/Fail Criteria: A temperature comparison is made between the return and

P5-0

Supply/Return Probe

supply probes.

Test

NOTE

 

 

 

If this test fails, “P5-0” and “FAIL” will be displayed. If both Probe tests

 

 

(this test and the PRIMARY/ SECONDARY) pass, the display will read

 

 

“P5” “PASS.”

3-21

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 CodesReplacing The Evaporator Fan Assembly Valve ReplacementEvaporator Coil Replacement Evaporator Heater Replacement 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 informationApproved Oil Mobil ST32 Oil Charge 2957 ml 100 ounces Model RSH105 Weight Dry 46.5 kg 103 lbTemperature 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 DCF02=5 Usda thermistor inputs Thermistor inputssupply & returnDCF02=2 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 CnF33 Snap Freeze Option CnF11 Defrost Off Selection NoOFFStd, Full SnAPDisplay Only Functions Sensor Reading Defrost temperature sensor reading is displayedPossibly delaying a needed defrost cycle 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 10 seconds Draw test is done after 15 secondsP1-1 OndsP6-2 Supply is comparedTest fails Crease, the test failsDenser fan is started and a 60 second timer is started Pressure switch is open or the condenser fan switch is openTimer is started Requirements Control temperature must be at least 15.6C 60FSet 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 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 Wrapped with Insulating compound. See Two expansion valves are used, the evaporatorRemoving the Expansion Valve Equalizer line Cleaned regularly. The preferred cleaning fluid is freshIf applicable, braze the equalizer connection to 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 Shorter than the other wire Cut wires 5 cm 2 inches from shoulder of defecCut one wire of existing cable 40 mm 1-1/2 inch 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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