Carrier 69NT20-531-300 manual Controller Alarm Indications Sheet 3

Page 44

 

Table 3-6 Controller Alarm Indications (Sheet 3 of 4)

 

 

 

 

 

Alarm 56 is activated by an invalid primary return temperature sensor reading

 

 

that is outside the range of -50 to +70_C (-58_F to +158_F). If Alarm 56 is acti-

 

 

vated and the primary return is the control sensor, the secondary return sensor

 

Primary Return

will be used for control if the unit is so equipped. If the unit is not equipped with

AL56

Temperature Sensor

a secondary return temperature sensor or it fails, the primary supply sensor will

 

Failure (RTS)

be used for control.

 

 

NOTE

 

 

The P5 Pre-Trip test must be run to inactivate the alarm.

AL57

Ambient Tempera-

Alarm 57 is triggered by an ambient temperature reading outside the valid range

 

ture Sensor Failure

from -50_C (-58_F) to +70_C (+158_F).

 

Compressor High

Alarm 58 is triggered when the compressor high discharge pressure safety switch

AL58

remains open for at least one minute. This alarm will remain active until the pres-

 

Pressure Safety

sure switch resets, at which time the compressor will restart.

 

 

 

 

 

 

Heat Termination

Alarm 59 is triggered by the opening of the heat termination thermostat and will

AL59

result in the disabling of the heater. This alarm will remain active until the ther-

 

Thermostat

mostat resets.

 

 

 

 

 

 

 

Alarm 60 is an indication of a probable failure of the defrost temperature sensor

 

 

(DTS). It is triggered by the opening of the heat termination thermostat (HTT) or

 

 

the failure of the DTS to go above set point within two hours of defrost initia-

AL60

Defrost Temperature

tion. After one-half hour with a frozen range set point, or one-half hour of contin-

 

Sensor Failure

uous compressor run time, if the return air falls below 7_C (45_F), the Controller

 

 

checks to ensure the DTS reading has dropped to 10_C or below. If not, a DTS

 

 

failure alarm is given and the defrost mode is operated using the return tempera-

 

 

ture sensor. The defrost mode will be terminated after one hour by the Controller.

 

 

Alarm 61 is triggered by detection of improper amperage resulting from heater

AL61

Heaters Failure

activation or deactivation. Each phase of the power source is checked for proper

amperage.This alarm is a display alarm with no resulting failure action, and will

 

 

 

 

be reset by a proper amp draw of the heater.

 

 

 

 

 

Alarm 62 is triggered by improper current draw increase (or decrease) resulting

AL62

Compressor Circuit

from compressor turn on (or off). The compressor is expected to draw a mini-

mum of 2 amps; failure to do so will activate the alarm. This is a display alarm

Failure

 

 

with no associated failure action and will be reset by a proper amp draw of the

 

 

compressor.

 

 

Alarm 63 is triggered by the current limiting system. If the compressor is ON

AL63

Current Over Limit

and current limiting procedures cannot maintain a current level below the user

selected limit, the current limit alarm is activated. This alarm is a display alarm

 

 

and is inactivated by power cycling the unit, changing the current limit via the

 

 

code select Cd32, or if the current decreases below the activation level.

 

Discharge Tempera-

Alarm 64 is triggered if the discharge temperature sensed is outside the range of

AL64

-60_C (-76_F) to 175_C (347_F), or if the sensor is out of range. This is a dis-

 

ture Over Limit

play alarm and has no associated failure action.

 

 

 

 

 

AL65

Discharge Pressure

Alarm 65 is triggered if a compressor discharge transducer is out of range. This is

 

Transducer Failure

a display alarm and has no associated failure action.

AL66

Suction Pressure

Alarm 66 is triggered if a suction pressure transducer is out of range. This is a

 

Transducer Failure

display alarm and has no associated failure action.

 

Humidity Sensor

Alarm 67 is triggered by a humidity sensor reading outside the valid range of 0%

AL67

to 100% relative humidity. If alarm AL67 is triggered when the dehumidification

 

Failure

mode is activated, then the dehumidification mode will be deactivated.

 

 

 

 

 

 

Suction Temperature

Alarm 69 is triggered by a suction temperature sensor reading outside the valid

AL69

range of -60_C (-76_F) to 150_C (302_F). This is a display alarm and has no

 

Sensor Failure

associated failure action.

 

 

 

 

 

3-19

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 60FBy starting P10-0 over Requirements Control temperature must be at least 7.2C 45FSet point, the test proceeds to test 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 Removing the Expansion Valve Two expansion valves are used, the evaporatorWrapped with Insulating compound. See 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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