Carrier 69NT40-511-310 - Figure 2-7 Refrigeration Circuit Schematic

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T -296

2-11

FILTER DRIER

TXV

TXV BULB

MODULATING VALVE

PRESSURE

TRANSDUCER

HEAT EXCHANGER

SIGHT GLASS

FILTER DRIER

HEAT EXCHANGER

MODULATING VALVE

PRESSURE

TRANSDUCER

SIGHT GLASS

FUSIBLE PLUG

RECEIVER

SERVICE VALVE

WATER-COOLED

CONDENSER

PRESSURE REGULATOR

TXV

TXV BULB

EVAPORATOR

CONDENSER

PRESSURE TRANSDUCER

SERVICE VALVE

PRESSURE REGULATOR

EVAPORATOR

CONDENSER

SERVICE VALVE

Circuit with Receiver

Circuit with Water Cooled Condenser

QUENCH VALVE

Figure 2-7 Refrigeration Circuit Schematic

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Table of Contents8
Description17
General Description17
Refrigeration Unit -- Front Section17
Fresh Air Makeup Vent17
Figure 2-1 Refrigeration Unit -- Front Section17
Evaporator Section18
Figure 2-2 Evaporator Section18
Compressor Section19
Figure 2-3 Compressor Section19
Air Cooled Condenser Section20
Figure 2-4 Condenser Section20
Water-Cooled Condenser Section21
Figure 2-5 Water-Cooled Condenser Section21
Control Box Section22
Communications Interface Module22
Figure 2-6 Control Box Section22
Refrigeration System Data23
Electrical Data24
Safety and Protective Devices25
Table 2-1 Safety and Protective Devices25
Refrigeration Circuit26
Figure 2-7 Refrigeration Circuit Schematic27
Arctic Option28
Figure 2-8 Arctic Option28
Microprocessor29
Temperature Control Microprocessor System29
Key Pad29
Figure 3- 1 Temperature Control System29
Display Module30
Figure 3- 2 Key Pad30
Figure 3- 3 Display Module30
Table 3-1 Key Pad Function30
Controller31
Controller Software31
Configuration Software (Configuration Variables)31
Operational Software (Function Codes)31
Modes of Operation31
Figure 3- 4 Micro-Link 2I Controller31
Temperature Control -- Perishable Mode32
Evaporator Fan Operation32
Defrost Interval32
Failure Action32
Generator Protection32
Condenser Pressure Control32
Arctic Mode32
Perishable Mode -- Conventional32
Perishable Mode -- Economy33
Perishable Mode -- Dehumidification33
Perishable, Dehumidification -- Bulb Mode33
Temperature Control -- Frozen Mode33
Frozen Mode -- Conventional34
Frozen Mode -- Economy34
Controller Alarms34
Unit Pre-Trip Diagnostics34
Datacorder35
Description35
Datacorder Software35
Sensor Configuration (Dcf02)36
Table 3-2 Datacorder Configuration Variables36
Table 3-3 Datacorder Standard Configurations36
Figure 3- 5 Standard Configuration Report37
Logging Interval (Dcf03)38
Thermistor Format (Dcf04)38
Sampling Type (Dcf05 & Dcf06)38
Alarm Configuration (Dcf07 -- Dcf10)38
Datacorder Power-Up38
Pre-Trip Data Recording38
Datacorder Communications38
Figure 3- 6 Data Reader38
USDA Cold Treatment39
USDA Cold Treatment Procedure39
Datacorder Alarms40
Table 3-4 Controller Configuration Variables41
Table 3-5 Controller Function Codes (Sheet 1 of 4)42
Table 3-6 Controller Alarm Indications (Sheet 1 of 3)46
Table 3-7 Controller Pre-Trip Test Codes (Sheet 1 of 4)49
Table 3-7 Controller Pre-Trip Test Codes (Sheet 2 of 4)50
Table 3-7 Temperature Controller Pre-Trip Test Codes (Sheet 3 of 4)51
Table 3-7 Controller Pre-Trip Test Codes (Sheet 4 of 4)52
Table 3-8 Datacorder Function Code Assignments53
Table 3-9 Datacorder Pre-Trip Result Records54
Table 3-10 Datacorder Alarm Indications55
Operation56
INSPECTION (before Starting)56
Connect Power56
Connection to 380/460 Vac Power56
Connection To190/230 Vac Power56
Adjust Fresh Air Makeup Vent56
Upper Fresh Air Makeup Vent56
Figure 4-1 Autotransformer56
Connect Water-Cooled Condenser57
Water--Cooled Condenser with Water Pressure Switch57
Water-Cooled Condenser with Condenser Fan Switch57
Connect Remote Monitoring Receptacle57
Starting and Stopping Instructions57
Starting the Unit57
Stopping the Unit57
Start--Up Inspection57
Physical Inspection57
Check Controller Function Codes57
Complete Inspection58
Pre-Trip Diagnosis58
Observe Unit Operation59
Crankcase Heater59
Probe Check59
Sequence of Operation59
Figure 4-3 Controller Operation -- Perishable Mode60
Sequence of Operation -- Perishable Mode Cooling61
Sequence of Operation61
Perishable Mode Heating61
Sequence of Operation -- Frozen Mode Cooling61
Figure 4-5 Perishable Mode Cooling61
Figure 4-6 Perishable Mode Heating61
Sequence of Operation -- Defrost62
Figure 4-7 Frozen Mode62
Figure 4-8 Defrost62
Troubleshooting64
Unit will Not Start or Starts then Stops64
Unit Operates Long or Continuously in Cooling64
Unit Runs but Has Insufficient Cooling65
Unit will Not Heat or Has Insufficient Heating65
Unit will Not Terminate Heating65
Unit will Not Defrost Properly65
Abnormal Pressures (Cooling)66
Abnormal Noise or Vibrations66
Controller Malfunction66
Evaporator Air Flow or Restricted Air Flow67
Thermostatic Expansion Valve Malfunction67
Autotransformer Malfunction67
Water-Cooled Condenser or Water Pressure Switch67
Service68
Section Layout68
Service Valves68
Manifold Gauge Set68
Figure 6-1 Service Valve68
Figure 6-2 Manifold Gauge Set68
Pumping the Unit down69
Figure 6-3 R-134A Manifold Gauge/Hose Set69
Figure 6-4. Refrigeration System Serviceconnections69
Refrigerant Leak Checking70
Evacuation and Dehydration70
General70
Preparation70
Procedure - Complete System70
Procedure - Partial System71
Refrigerant Charge71
Checking the Refrigerant Charge71
Adding Refrigerant to System (Full Charge)71
Adding Refrigerant to System (Partial Charge)71
Figure 6-5. Compressor Service Connections71
Compressor72
Removal and Replacement of Compressor72
Compressor Disassembly72
Figure 6-6 Compressor72
Figure 6-7 Exploded View of Valve Plate73
Figure 6-8 Bottom Plate Removed73
Figure 6-9 Oil Pump and Bearing Head74
Figure 6-10 Low Profile Oil Pump74
Figure 6-11 Motor End Cover74
Preparation75
Figure 6-12 Equalizing Tube and Lock Screw Assembly75
Figure 6-13 Crankshaft Assembly75
Figure 6-14 Suction Valve & Positioning Springs75
Figure 6-15 Piston Ring75
Installing the Components76
High Pressure Switch77
Replacing High Pressure Switch77
Checking High Pressure Switch77
Condenser Coil77
Condenser Fan and Motor Assembly77
Figure 6-16 High Pressure Switch Testing77
Water Cooled Condenser Cleaning78
Filter-Drier79
Figure 6-18 Water Cooled Condenser Cleaning - Gravity Circulation79
Checking Superheat80
Hermetic Valve Replacement80
Figure 6-19 Thermostatic Expansion Valve Bulb80
Figure 6-20 Hermetic Thermostatic Expansion Valve80
Semi--Hermetic Valve Replacement81
Figure 6-21 Hermetic Thermostatic Expansion Valve Brazing Procedure81
Evaporator Coil and Heater Assembly82
Evaporator Coil Replacement82
Evaporator Heater Replacement82
Evaporator Fan and Motor Assembly82
Replacing the Evaporator Fan Assembly82
Disassemble the Evaporator Fan Assembly82
Assemble the Evaporator Fan Assembly82
Figure 6-23. Evaporator Fan Assembly82
Evaporator Fan Motor Capacitors83
When to Check for a Defective Capacitor83
Removing the Capacitor83
Checking the Capacitor83
Suction Modulation Valve83
Precheck Procedure84
Checking the Stepper Valve84
Figure 6-24 Suction Modulation Valve (SMV)84
Checking the Drive Module85
Checking the Controller85
Emergency Repair Procedures85
Figure 6-25 Jumper Assembly85
Autotransformer86
Controller86
Handling Controller86
Controller Trouble-Shooting86
Figure 6-26 Controller Section of the Control Box86
Controller Programming Procedure87
Removing and Installing the Controller87
Battery Replacement87
Temperature Sensor Service87
Sensor Checkout Procedure87
Sensor Replacement88
Figure 6-27 Sensor Types88
Figure 6-28 Sensor and Cable Splice88
Table 6-1 Sensor Temperature/Resistance Chart88
Sensor Re--Installation89
Figure 6-29 Supply Sensor Positioning89
Figure 6-30 Return Sensor Positioning89
Figure 6-31. Electronic Partlow Temperature Recorder91
Checking the Temperature Recorder92
Saginomiya Temperature Recorder94
Figure 6-32. Partlow Mechanical Temperature Recorder94
Figure 6-33. Saginomiya Temperature Recorder95
Maintenance of Painted Surfaces96
Composite Control Box Repairs96
Introduction96
Cracks96
Chips and Holes96
Inserts96
Door Hinge Inserts96
Figure 6-34 Door Hinge Repair96
Table 6-3 Crack, Chip & Hole Repair Kit97
Table 6-4 Insert Repair Kit97
Table 6-5 Drill Information97
Figure 6-35. Insert Location98
Figure 6-36. Communications Interface Installation99
Table 6-6 Recommended Bolt Torque Values99
Table 6-7 Wear Limits for Compressors100
Table 6-8 Compressor Torque Values101
Table 6-9 R-134A Temperature - Pressure Chart102
Figure 6-37 R-134A Compressor Pressure and Motor Current Curves Versus Ambient Temperature103
Electrical Wiring Schematic105
Introduction105
Figure 7-1 LEGEND105
Figure 7-2 SCHEMATIC DIAGRAM -- Units with PID Numbers: NT0435, NT0566 and NT0669106
Figure 7-3 WIRING DIAGRAM --Units with PID Numbers: NT0435, NT0566 and NT0669107
Figure 7-4 SCHEMATIC DIAGRAM -- Units with PID Number 0712109
Figure 7--5 WIRING DIAGRAM -- Units with PID Number 0712110
Figure 7-7 WIRING DIAGRAM -- Units with PID Number 0881113

Carrier 69NT40-511-310 - Figure 2-7 Refrigeration Circuit Schematic

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