Carrier 69NT20-531-300 Pressure switch is open or the condenser fan switch is open, Utes, P7-1

Page 48

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

NOTE

P7-0 through P10 are included with the “Auto2” only.

 

 

NOTE

 

 

This test is skipped if the sensed ambient temperature is less than 7_C

P7-0

 

(45_F), the return air temperature is less than -17.8_C (0_F), the water

High Pressure

pressure switch is open or the condenser fan switch is open.

 

Switch Closed

 

 

Setup: With the unit running, the condenser fan is de-energized, and a 15 minute

 

 

 

 

timer is started.

 

 

Pass/Fail Criteria: The test fails if high pressure switch fails to open in 15 min-

 

 

utes.

 

 

Requirements: Test P7-0 must pass for this test to execute. Setup: The con-

P7-1

High Pressure

denser fan is started and a 60 second timer is started.

Switch Open

Pass/Fail Criteria: Passes the test if the high pressure switch (HPS) closes

 

 

 

within the 60 second time limit, otherwise, it fails.

 

 

Setup: If the container temperature is below 15.6°C (60_F), the set point is

 

 

changed to 15.6°C, and a 180 minute timer is started. The left display will read

P8-0

Perishable Mode

“P8-0.” The control will then heat the container until 15.6°C is reached. If the

container temperature is above 15.6°C at the start of the test, then the test pro-

Heat Test

 

ceeds immediately to test P8-1 and the left display will change to “P8-1.”

 

 

 

 

Pass/Fail Criteria: The test fails if the 180 minute timer expires before the con-

 

 

trol temperature reaches set point. The display will read “P8-0,” “FAIL.”

 

 

Requirements: Control temperature must be at least 15.6°C (60_F).

 

 

Setup: The set point is changed to 0°C (32_F), and a 180 minute timer is

P8-1

Perishable Mode

started. The left display will read “P8-1,” the right display will show the supply

air temperature. The unit will then start to pull down the temperature to the 0°C

Pull Down Test

 

set point.

 

 

 

 

Pass/Fail Criteria: The test passes if the container temperature reaches set point

 

 

before the 180 minute timer expires.

 

 

Requirements: Test P8-1 must pass for this test to execute. This test is skipped

 

 

if the DATAcorder is not configured or available.

 

 

Setup: The left display will read “P8-2,” and the right display will show the sup-

 

 

ply air temperature. A two hour timer is started. The unit will be required to

 

 

maintain the temperature to within + or - 0.5_C (0.9_F) of set point until a Da-

 

 

taCORDER recording is executed. The recorder supply probe temperature run-

 

Perishable Mode

ning total (and its associated readings counter) will be zeroed out for the remain-

 

der of the recording period at the start of this test, so that the actual value

P8-2

Maintain Tempera-

recorded in the DataCORDER will be an average of only this test’s results. Once

 

ture Test

 

a recording interval is complete, the average recorder supply temperature will be

 

 

 

 

recorded in the DataCORDER, as well as stored in memory for use in applying

 

 

the test pass/fail criteria.

 

 

Pass/Fail Criteria: If the recorded temperature is within +/- 0.5_C. of set point

 

 

from test start to DataCORDER recording, the test passes. If the average temper-

 

 

ature is outside of the tolerance range at the recording, the test fails and will

 

 

auto-repeat by starting P8-0 over.

 

 

Setup: The defrost temperature sensor (DTS) reading will be displayed on the

 

 

left display. The right display will show the supply air temperature. The unit will

 

 

run FULL COOL for 30 minutes maximum until the DTT is considered closed.

P9-0

Defrost Test

Once the DTT is considered closed, the unit simulates defrost by running the

heaters for up to two hours, or until the DTT is considered open.

 

 

 

 

Pass/Fail Criteria: The test fails if: the DTT is not considered closed after the

 

 

30 minutes of full cooling, HTT opens when DTT is considered closed or if re-

 

 

turn air temperature rises above 49/50_C (120/122_F).

3-23

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 60FRequirements Control temperature must be at least 7.2C 45F Set point, the test proceeds to testBy 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 Two expansion valves are used, the evaporator Wrapped with Insulating compound. SeeRemoving the Expansion Valve 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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