Carrier 69NT20-531-300 manual Cut wires 5 cm 2 inches from shoulder of defec, 43,200 423,300

Page 81

Table 6-2 Sensor Temperature/Resistance Chart

b. Cut wire(s) 5 cm (2 inches) from shoulder of defec-

 

(+/--.002%)

 

tive sensor and discard the defective probe only.

Temperature

Resistance

c. Cut one wire of existing cable 40 mm (1-1/2 inch)

shorter than the other wire.

_C

_F

(Ohms)

d. Cut one replacement sensor wire (opposite color)

 

 

AMBS,

CPDS

 

 

back 40 mm (1-1/2 inch). (See Figure 6-19.)

 

 

CPSS,

 

 

 

 

e. Strip back insulation on all wiring 6.3 mm (1/4 inch).

 

 

DTS, RTS,

 

 

 

RRS, STS,

 

f. Slide a large piece of heat shrink tubing over the

 

 

SRS

 

cable, and place the two small pieces of heat shrink

-30

-22

177,000

1,770,000

tubing, one over each wire, before adding crimp fit-

-25

-13

130,400

1,340,000

tings as shown in Figure 6-20.

 

Sensor (Typical)

-20

-4

97,070

970,700

 

-15

5

72,900

729,000

 

 

-10

14

55,330

553,000

 

Heat Shrink

-5

23

43,200

423,300

Cable

Tubing (3)

0

32

32,650

326,500

 

 

5

41

25,390

253,900

Large Heat Shrink

10

50

19,900

199,000

Tubing (1)

 

15

59

15,700

157,100

 

 

 

20

68

12,490

124,900

25

77

10,000

100,000

30

86

8,060

80,600

35

95

6,530

65,300

40

104

5,330

53,300

45

113

4,370

43,700

50

122

3,600

36,000

55

131

2,900

29,000

60

140

2,490

24,900

65

149

2,080

20,800

65

158

1,750

17,500

e. Using the plug connector marked “EC”, that is con- nected to the back of the controller, locate the sensor wires (RRS, RTS, SRS, STS, AMBS, DTS, CPDS OR CPSS as required). Follow those wires to the con- nector and using the pins of the plug, measure the resistance. Values are provided in Table 6-2.

Due to the variations and inaccuracies in ohmmeters, thermometers or other test equipment, a reading within 2% of the chart value would indicate a good sensor. If a sensor is defective, the resistance reading will usually be much higher or lower than the resis- tance values given.

6.22.2 Sensor Replacement

a. Turn unit power OFF, disconnect power supply and remove sensor assembly from unit.

Figure 6-20 Typical Sensor and Cable Splice

g. Slip crimp fittings over dressed wires (keeping wire colors together). Make sure wires are pushed into crimp fittings as far as possible and crimp with crimp- ing tool.

h. Solder spliced wires with a 60% tin and 40% lead Rosincore solder.

i.Slide heat shrink tubing over splice so that ends of tubing cover both ends of crimp as shown in Figure 6-20.

j.Heat tubing to shrink over splice. Make sure all seams are sealed tightly against the wiring to prevent mois- ture.

k.Slide large heat shrink tubing over both splices and shrink.

CAUTION

Do not allow moisture to enter wire splice area as this may affect the sensor resistance.

l.Position sensor in unit as shown in m.Figure 6-21 Slip crimp fittings over dressed wires (keeping wire colors together). Make sure wires are pushed into crimp fittings as far as possible and crimp with crimping tool. and re-check sensor resistance.

n. Reinstall sensor, refer to paragraph 6.22.3.

NOTE

The P5 Pre-Trip test must be run to inactivate probe alarms (refer to paragraph 4.7).

6-17

T-309

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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 MonitoringEvaporator Coil Replacement Evaporator Heater Replacement Valve ReplacementReplacing The Evaporator Fan Assembly Precheck Procedure Checking The Stepper valveElectrical 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 masterTemperature Model RSH105 Weight Dry 46.5 kg 103 lbApproved 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 Section Microprocessor Temperature Control SystemKEY Function Controller Software Modes of Operation Perishable Mode -- Economy Controller Alarms Unit PRE-TRIP Diagnostics DCF02=2 Thermistor inputssupply & returnDCF02=5 Usda thermistor inputs DCF02=6Raw Data Report for ABC1234567 Standard Configuration Download ReportLogging Interval dCF03 DataCORDER may be powered up in any one of four waysDataView DataCORDER Alarms Std, Full CnF11 Defrost Off Selection NoOFFCnF33 Snap Freeze Option SnAPDisplay Only Functions Possibly delaying a needed defrost cycle Defrost temperature sensor reading is displayedSensor 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 Memory failure Error DescriptionP1-1 Draw test is done after 15 secondsDraw test is done after 10 seconds OndsTest fails Supply is comparedP6-2 Crease, the test failsTimer is started Pressure switch is open or the condenser fan switch is openDenser 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 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 If applicable, braze the equalizer connection to Cleaned regularly. The preferred cleaning fluid is freshEqualizer line Check superheat refer to step14. Unloader Solenoid Valve Start unit and check operationEvaporator FAN Motor Capacitors Valve Override Controls Precheck Procedure TP1 Mounting Stud Type Cut one wire of existing cable 40 mm 1-1/2 inch Cut wires 5 cm 2 inches from shoulder of defecShorter 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 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.

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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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