Carrier 69NT20-531-300 manual KEY Function

Page 27

3.1.1 Key Pad

The key pad (Figure 3- 2) is mounted on the right-hand side of the control box. The key pad consists of eleven push button switches that act as the user’s interface with the controller. Descriptions of the switch functions are provided in Table 3-1.

CODE

PRE

SELECT

TRIP

ALARM

DEFROST

LIST

INTERVAL

 

ENTER

RETURN

_C

SUPPLY

_F

BATTERY

ALT.

POWER

MODE

Figure 3- 2 Key Pad

COOL

HEAT DEFROST IN RANGE ALARM

SUPPLY RETURN

 

SETPOINT/Code

AIR TEMPERATURE/Data

Figure 3- 3 Display Module 3.1.2 Display Module

The display module (Figure 3- 3) consists of two backlighted five digit LCD displays and seven indicator lights. The indicator lights include:

1.Cool - White LED: Energized when the refrigerant compressor is energized.

2.Heat - Orange LED: Energized to indicate heater op- eration in the heat or defrost mode.

3.Defrost - Orange LED: Energized when the unit is in the defrost mode.

4.In-Range - Green LED: Energized when the con- trolled temperature probe is within specified toler- ance of set point.

 

Table 3-1 Key Pad Function

 

 

 

KEY

 

FUNCTION

Code Select

 

Accesses function codes.

 

 

 

Pre-Trip

 

Displays the pre-trip selection menu. Dis-

 

continues pre-trip in progress.

 

 

Alarm List

 

Displays alarm list and clears the alarm

 

 

queue.

Defrost

 

Displays selected defrost interval.

Interval

 

 

 

Enter

 

Confirms a selection or saves a selection

 

to the controller.

 

 

Arrow Up

 

Change or scroll a selection upward Pre-

 

trip advance or test interruption.

 

 

Arrow

 

Change or scroll a selection downward.

Down

 

Pre-trip repeat backward.

Return/

 

Displays non-controlling probe tempera-

Supply

 

ture (momentary display).

 

 

Displays alternate English/Metric scale

 

 

(momentary display). When set to _F,

 

 

pressure is displayed in psig and vacuum

 

 

in “/hg. “P” appears after the value to in-

_C/_F

 

dicate psig and “i” appears for inches of

 

 

mercury.

 

 

When set to _C. pressure readings are in

 

 

bars. “b” appears after the value to indi-

 

 

cate bars.

 

 

 

Battery

 

Initiate battery backup mode to allow set

 

point and function code selection if AC

Power

 

 

power is not connected.

 

 

 

 

 

 

 

This key is pressed to switch the functions

 

 

from the temperature software to the Da-

ALT Mode

 

taCORDER Software. The remaining keys

 

function the same as described above ex-

 

 

cept the readings or changes are made to

 

 

the DataCORDER programming..

 

 

NOTE

The controlling probe in the perishable range will be the SUPPLY air probe and the control- ling probe in the frozen range will be the RETURN air probe.

5.Supply - Yellow LED: Energized when the supply air probe is used for control. When this LED is illumi- nated, the temperature displayed in the AIR TEMPER- ATURE display is the reading at the supply air probe. This LED will flash if dehumidification or humidifi- cation is enabled.

6.Return - Yellow LED: Energized when the return air probe is used for control. When this LED is illumi- nated, the temperature displayed in the AIR TEM- PERATURE display is the reading at the return air pro- be. This LED will flash if dehumidification or humidification is enabled.

7.Alarm - Red LED: Energized when there is an active or an inactive shutdown alarm in the alarm queue

T-309

3-2

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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 startedRequirements 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 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 Two expansion valves are used, the evaporator Wrapped with Insulating compound. SeeRemoving the Expansion Valve 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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