Carrier 69NT20-531-300 manual Safety and Protective Devices

Page 22

PARAGRAPH 2.3 -- Continued

 

Orange wire

Power

 

 

 

 

Red wire

Output

 

 

 

 

Brown wire

Ground

 

 

 

 

Input voltage

5 vdc

 

 

 

g. Humidity Sensor

Output voltage

0 to 3.3 vdc

Output voltage readings verses relative humidity (RH) percentage:

 

 

 

 

 

30%

0.99 V

 

 

 

 

50%

1.65 V

 

 

 

 

70%

2.31 V

 

 

 

 

90%

2.97 V

 

 

 

2.4 SAFETY AND PROTECTIVE DEVICES

Unit components are protected from damage by safety and protective devices listed in the following table. These devices monitor the unit operating conditions and open a set of electrical contacts when an unsafe condition occurs.

Open safety switch contacts on either or both of devices

IP-CP or HPS will shut down the compressor.

Open safety switch contacts on device IP-CM will shut down the condenser fan motor.

The entire refrigeration unit will shut down if one of the following safety devices open: (a) Circuit Breaker(s);

(b)Fuse (F3/15A); or (c) Evaporator Fan Motor Internal Protector(s) - (IP-EM).

Table 2-1 Safety and Protective Devices

UNSAFE CONDITION

DEVICE

DEVICE SETTING

 

 

 

 

Circuit Breaker (CB-1) - Manual Reset

Trips at 29 amps (460 vac)

 

 

 

Excessive current draw

Circuit Breaker (CB-2, 50 amp) -Manual Reset

Trips at 62.5 amps (230 vac)

 

Circuit Breaker (CB-2, 70 amp) -Manual Reset

Trips at 87.5 amps (230 vac)

 

 

 

Excessive current draw in the

Fuse (F3)

10 amp rating

control circuit

 

 

Excessive current draw by the

Fuse (F1 & F2)

5 amp rating

controller

 

 

Excessive current draw by the

Fuse (F4)

10 amp rating

expansion module

 

 

Excessive condenser fan mo-

Internal Protector (IP-CM) - Automatic Reset

N/A

tor winding temperature

 

 

Excessive compressor motor

Internal Protector (IP-CP) - Automatic Reset

N/A

winding temperature

 

 

Excessive evaporator fan mo-

Internal Protector(s) (IP-EM) - Automatic Reset

N/A

tor(s) winding temperature

 

 

Abnormal pressures/tempera-

Fusible Plug - Used on the Receiver

93 _C = (200 _F)

 

 

tures in the high refrigerant

Rupture Disc - Used on the Water-Cooled Con-

35 kg/cm@ = (500 psig)

side

denser

 

 

 

 

 

 

Abnormally high discharge

High Pressure Switch (HPS)

Opens at 25 kg/cm@

pressure

(350 psig)

 

 

 

 

T-309

2-8

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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.

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