Carrier 69NT20-531-300 Defrost temperature sensor reading is displayed, Sensor Reading, Unit

Page 40

 

 

Table 3-5 Controller Function Codes (Sheet 2 of 3)ff

 

 

 

 

Cd22

Compressor State

 

The status of the compressor is displayed (Off, On).

 

 

 

 

Cd23

Evaporator Fan

 

Displays the current evaporator fan state (high, low or off).

 

 

 

 

Cd24

Controlled

 

Not used in this application

 

Atmosphere State

 

 

 

Compressor Run

 

This code displays the time remaining until the unit goes into defrost (in tenths of

Cd25

Time Remaining

 

 

an hour). This value is based on the actual accumulated compressor running time.

 

Until Defrost

 

 

 

 

 

 

 

 

Cd26

Defrost Temperature

 

Defrost temperature sensor reading is displayed.

 

Sensor Reading

 

 

Configurable Functions

NOTE

Function codes Cd27 through Cd37 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container.

 

 

The defrost interval is the time between defrost cycles. Five selectable values are

 

 

available: 3, 6, 9, 12 or 24 hours. The factory default value is 12 hours. Follow-

 

 

ing a start-up or after termination of a defrost, the time will not begin counting

 

 

down until the defrost temperature sensor (DTS) reading falls below set point. If

 

 

the reading of DTS rises above set point any time during the timer count down,

 

 

the interval is reset and the countdown begins over. If DTS fails, alarm code

 

 

AL60 is activated and control switches over to the the return temperature sensor.

 

Defrost Interval

The controller will act in the same manner as with the DTS except the return tem-

Cd27

perature sensor reading will be used.

(Hours)

Defrost Interval Timer Value (Configuration variable CnF23): If the software is

 

 

configured to “SAv” (save) for this option, then the value of the defrost interval

 

 

timer will be saved at power down and restored at power up. This option prevents

 

 

short power interruptions from resetting an almost expired defrost interval, and

 

 

possibly delaying a needed defrost cycle.

 

 

NOTE

 

 

The defrost interval timer counts only during compressor run time.

 

 

 

 

 

This code determines the temperature units (_C or _F) which will be used for all

 

 

temperature displays. The user selects _C or _F by selecting function code Cd28

Cd28

Temperature Units

and pushing the ENTER key. The factory default value is Celsius units.

 

 

(_C or _F)

NOTE

 

 

This function code will display “---------------“ if Configuration Variable

 

 

CnF34 is set to _F.

 

 

 

 

 

If all of the control sensors are out of range (alarm code AL26) or there is a probe

 

 

circuit calibration failure (alarm code AL27), the unit will enter the shutdown

 

 

state defined by this setting. The user selects one of four possible actions as fol-

 

 

lows:

 

Failure Action

A - Full Cooling (compressor is on, economized operation. SMV subject to pressure

Cd29

and current limit.)

 

(Mode)

B - Partial Cooling (Compressor is on, standard operation. SMV subject to pressure

 

 

and current limit.)

 

 

C - Evaporator Fan Only (Compressor is off, evaporator fans on high speed, not ap-

 

 

plicable with frozen set points.

 

 

D - Full System Shutdown - Factory Default (shut down every component in the

 

 

unit)

 

 

The in-range tolerance will determine the band of temperatures around the set

 

 

point which will be designated as in-range. If the control temperature is in-range,

Cd30

In-Range Tolerance

the in-range light will be illuminated. There are four possible values:

1 = ¦ 0.5_C (¦ 0.9_F)

 

 

2 = ¦ 1.0_C (¦ 1.8_F)

 

 

3 = ¦ 1.5_C (¦ 2.7_F)

 

 

4 = ¦ 2.0_C (¦ 3.6_F) - Factory Default

3-15

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 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 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.

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