Carrier 69NT20-531-300 manual Controller Alarm Indications Sheet 1

Page 42

 

Table 3-6 Controller Alarm Indications (Sheet 1 of 4)

 

 

 

Code

TITLE

DESCRIPTION

No.

 

 

 

 

Alarm 13 is triggered if the control module has lost communication with the ex-

 

 

pansion module for more than five minutes or communication fails within the

AL13

Expansion Module

first 15 seconds on power up. This alarm triggers failure action C (evaporator fan

only) or D (all machinery off) of Function Code Cd29 if the unit has a perishable

 

 

 

 

set point. Failure action D (all machinery off) is triggered if the unit has a frozen

 

 

set point

 

 

Alarm 14 is triggered if the electronic phase detection system is unable to deter-

 

 

mine the correct phase relationship. DIRCHECK will be displayed while the

AL14

Phase Sequence

relationship is determined. If the system is unable to determine the proper rela-

tionship alarm 14 will remain active. Additiotnal information on phase detection

 

Failure - Electronic

may be displayed at Function Code Cd41. If the right most digit of Code Cd41 is

 

 

3 or 4, this indicates incorrect motor or sensor wiring. If the right most digit is 5,

 

 

this indicates a failed current sensor assembly.

AL15

Loss Cooling

Future Expansion

 

 

 

 

Compressor Current

Alarm 16 is triggered if compressor current draw is 15% over calculated maxi-

AL16

mum for 10 minutes out of the last hour. The alarm is display only and will trig-

 

High

ger off when the compressor operates for one hour without over current.

 

 

 

 

 

 

 

Alarm 17 is triggered if a compressor start in both directions fails to generate

 

 

sufficient pressure differential. The controller will attempt restart every twenty

AL17

Phase Sequence

minutes and deactivate the alarm if successful. This alarm triggers failure action

 

Failure - Pressure

C (evaporator fan only) or D (all machinery off) of Function Code Cd29 if the

 

 

unit has a perishable set point. Failure action D (all machinery off) is triggered if

 

 

the unit has a frozen set point

 

Discharge Pressure

Alarm 18 is triggered if discharge pressure is 10% over calculated maximum for

AL18

10 minutes within the last hour. The alarm is display only and will trigger off

 

High

when the compressor operates for one hour without overpressure.

 

 

 

 

 

 

Discharge Tempera-

Alarm 19 is triggered if discharge temperature exceeds 135_C (275_F) for 10

AL19

minutes within the last hour. The alarm is display only and will trigger off when

 

ture High

the compressor operates for one hour without over temperature.

 

 

 

 

 

 

Control Circuit Fuse

Alarm 20 is triggered by control power fuse (F3) opening and will cause the soft-

AL20

ware shutdown of all control units. This alarm will remain active until the fuse is

 

Open (24 vac)

replaced.

 

 

 

 

 

 

 

Alarm 21 is triggered by one of the fuses (F1/F2) being opened on 18 volts AC

AL21

Micro Circuit Fuse

power supply to the Controller. The suction modulation valve (SMV) will be

 

Open (18 vac)

opened and current limiting is halted. Temperature control will be maintained by

 

 

cycling the compressor.

 

Evaporator Fan Mo-

Alarm 22 responds to the evaporator motor internal protectors. The alarm is trig-

AL22

gered by opening of either internal protector. It will disable all control units until

 

tor Safety

the motor protector resets and the unit is power cycled.

 

 

 

 

 

 

 

Alarm 23 is triggered if low current draw is detected on phase B and IPCP, HPS

 

 

or IPEM is not tripped. If the compressor should be running, the controller will

AL23

Loss of Phase B

initiate a start up every five minutes and trigger off if current reappears. If the

evaporator fan motors only should be running, the alarm will trigger off is cur-

 

 

rent reappears. This alarm triggers failure action C (evaporator fan only) or D

 

 

(all machinery off) of Function Code Cd29 if the unit has a perishable set point.

 

 

Failure action D (all machinery off) is triggered if the unit has a frozen set point

 

 

Alarm 24 is triggered when compressor is not drawing any current. It also trig-

AL24

Compressor Motor

gers failure action ”C” or ”D” set by function Code 29 for perishable setpoint, or

 

Safety

”D” for frozen setpoint. This alarm will remain active until compressor draws

 

 

current.

3-17

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

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