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T -334 4--6

SET POINT

PULL DOWN

RISING

TEMPERATURE

-0.5C

(0.9F)

-0.20C

+.20C

HEATING

AIR CIRCULATION

+2.5C

(4.5F)

UNLOADED OPERATION

MODULATED

COOLING

UNLOADED

AIR CIRCULATION

SET POINT

+.20C

HEATING

+2.5C

(4.5F)

FALLING

TEMPERATURE

MODULATED

COOLING

UNLOADED

-0.5C

(0.9F)

AIR CIRCULATION

NOTE: TEMPERATURES INDICATIONS ARE ABOVE OR BELOW SET POINT

START UNLOADED,

TRANSITION TO

ECONOMIZED

OPERATION

-0.20C

Figure 4-- 3 Controller Operation - Perishable Mode

SET POINT

FALLING

TEMPERATURE

RISING

TEMPERATURE

-0.20C

+.20C

COOLING

ECONOMIZED

AIR CIRCULATION

START UNLOADED,

TRANSITION TO

ECONOMIZED

OPERATION

NOTE: TEMPERATURES INDICATIONS ARE ABOVE OR BELOW SET POINT

AIR CIRCULATION

Figure 4-- 4 Controller Operation - Frozen Mode

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Table of Contents4
Figure 2--1 Refrigeration Unit - Front Section15
Evaporator Section16
Figure 2--2 Evaporator Section16
Compressor Section17
Figure 2--3 Compressor Section17
Air-Cooled Condenser Section18
Figure 2--4 Air-Cooled Condenser Section18
Water-Cooled Condenser Section19
Figure 2--5 Water-Cooled Condenser Section19
Control Box Section20
Communications Interface Module20
Figure 2--6 Control Box Section20
Refrigeration System Data21
Electrical Data22
Safety and Protective Devices23
Table 2--1 Safety and Protective Devices24
Refrigeration Circuit25
Standard Operation25
Economized Operation25
Unloaded Operation25
Liquid Injection Operation25
Expansion Bypass Solenoid Valve25
Figure 2--7 Refrigeration Circuit Schematic - Standard Operation26
Figure 2--8 Refrigeration Circuit Schematic - Economized Operation27
Figure 2--9 Refrigeration Circuit Schematic - Unloaded Operation27
Microprocessor28
Temperature Control Microprocessor System28
Figure 3--1 Temperature Control System28
Key Pad29
Display Module29
Figure 3--2 Key Pad29
Table 3--1 Key Pad Function29
Controller30
Controller Software30
Configuration Software (Variables)30
Operational Software (Function Codes)30
Figure 3--3 Display Module30
Modes of Operation31
Temperature Control - Perishable Mode31
Evaporator Fan Operation31
Defrost Interval31
Failure Action31
Generator Protection31
Compressor High Temperature, Low Pressure Protection31
Perishable Mode - Conventional31
Figure 3--4 Control Module31
Perishable Mode - Economy32
Perishable Mode - Dehumidification32
Perishable, Dehumidification - Bulb Mode32
Perishable - System Pressure Regulation33
Temperature Control - Frozen Mode33
Frozen Mode - Conventional33
Frozen Mode - Economy33
Condenser Fan Switch Override33
Controller Alarms33
Datacorder35
Description35
Datacorder Software35
Sensor Configuration (Dcf02)35
Logging Interval (Dcf03)36
Thermistor Format (Dcf04)36
Table 3--2 Datacorder Configuration Variables36
Figure 3--5 Standard Configuration Download Report37
Sampling Type (Dcf05 & Dcf06)38
Alarm Configuration (Dcf07 - Dcf10)38
Datacorder Power-Up38
Pre-Trip Data Recording38
Datacorder Communications38
Table 3--3 Datacorder Standard Configurations38
USDA Cold Treatment39
USDA Cold Treatment Procedure39
Figure 3--6 Data Reader39
Datacorder Alarms40
ISO Trip Header40
Table 3--4 Controller Configuration Variables41
Table 3--5 Controller Function Codes43
Table 3--6 Controller Alarm Indications47
Table 3--7 Controller Pre-Trip Test Codes51
Table 3--8 Datacorder Function Code Assignments55
Table 3--9 Datacorder Pre-Trip Result Records56
Table 3--10 Datacorder Alarm Indications57
Operation58
INSPECTION (before Starting)58
Connect Power58
Connection to 380/460 VAC Power58
Connection to 190/230 VAC Power58
Adjust Fresh Air Makeup Vent58
Figure 4--1 Autotransformer58
Upper Fresh Air Makeup Vent59
Lower Fresh Air Makeup Vent59
Fresh Air Position Sensor59
Figure 4--2 Make up Air Flow Chart59
Connect Water-Cooled Condenser60
Water-Cooled Condenser with Water Pressure Switch60
Water-Cooled Condenser with Condenser Fan Switch60
Connect Remote Monitoringreceptacle60
Starting and Stopping Instructions60
Starting the Unit60
Stopping the Unit60
Start-Up Inspection60
Physical Inspection60
Check Controller Function Codes60
Complete Inspection61
Pre-Trip Diagnosis61
Observe Unit Operation62
Probe Check62
Sequence of Operation62
Sequence of Operation - Compressor Phase Sequence62
Figure 4--3 Controller Operation - Perishable Mode63
Figure 4--4 Controller Operation - Frozen Mode63
Sequence of Operation - Perishable Mode Cooling64
Sequence of Operation - Perishable Mode Heating64
Figure 4--5 Perishable Mode - Cooling64
Figure 4--6 Perishable Mode Heating64
Sequence of Operation - Frozen Mode Cooling65
Sequence of Operation - Defrost65
Figure 4--7 Frozen Mode65
Emergency Bypass Operation66
Troubleshooting67
Unit will Not Start or Starts then Stops67
Unit Operates Long or Continuously in Cooling67
Unit Runs but Has Insufficient Cooling68
Unit will Not Heat or Has Insufficient Heating68
Unit will Not Terminate Heating68
Unit will Not Defrost Properly68
Abnormal Pressures (Cooling)69
Abnormal Noise or Vibrations69
Controller Malfunction70
Evaporator Air Flow or Restricted Air Flow70
Thermostatic Expansion Valve Malfunction70
Autotransformer Malfunction70
Water-Cooled Condenser or Water Pressure Switch70
Compressor Operating in Reverse71
Abnormal Temperatures71
Abnormal Currents71
Service72
Section Layout72
Manifold Gauge Set72
Figure 6--1 Manifold Gauge Set72
Figure 6--2 R-134A Manifold Gauge/Hose Set72
REFRIGERATION SYSTEM SERVICE-UNITS with STANDARD PIPING (with Service Valves)73
Service Connections73
Pumping down the Unit73
Figure 6--3 Service Valve73
Refrigerant Leak Checking74
Evacuation and Dehydration74
Figure 6--4 Refrigeration System Service Connections74
Refrigerant Charge75
Adding Refrigerant to System (Full Charge)75
Adding Refrigerant to System (Partial Charge)75
Figure 6--5 Semi-Hermetic Piping Refrigeration System Service Connections76
Compressor78
Removal and Replacement of Compressor78
Figure 6--6 Compressor Upper Mounting78
Table 6--1 Compressor Kit78
Figure 6--7 Compressor Lower Mounting79
Compressor Oil Level80
High Pressure Switch80
Replacing High Pressure Switch80
Checking High Pressure Switch80
Figure 6--8 High Pressure Switch Testing80
Condenser Coil81
Condenser Fan and Motor Assembly81
Water--Cooled Condenser Cleaning81
Figure 6--9 Water-Cooled Condenser Cleaning - Forced Circulation82
Filter Drier83
Expansion Valves83
Checking Superheat83
Figure 6--10 Water-Cooled Condenser Cleaning - Gravity Circulation83
Figure 6--11 Thermostatic Expansion Valve Bulb83
Valve Replacement84
Evaporator Coil Replacement84
Figure 6--12 Evaporator Expansion Valve84
Figure 6--13 Economizer Expansion Valves84
Evaporator Heater Replacement85
Economizer, Unloader, Liquid Injection, and Expansion Bypass Solenoid Valves85
Figure 6--14 Hermetic Thermostatic Expansion Valve Brazing Procedure85
Evaporator Fan and Motor Assembly86
Replacing the Evaporator Fan Assembly86
Disassemble the Evaporator Fan Assembly86
Figure 6--16 Unloader Solenoid Valve86
Figure 6--17 Evaporator Fan Assembly86
Assemble the Evaporator Fan Assembly87
Evaporator Fan Motor Capacitors87
When to Check for a Defective Capacitor87
Removing the Capacitor87
Valve Override Controls87
Table 6--2 Valve Override Control Displays88
Suction Modulation Valve89
Precheck Procedure89
Checking the Stepper Valve89
Autotransformer89
Figure 6--18 Suction Modulation Valve (SMV)89
Controller90
Handling Modules90
Controller Trouble-Shooting90
Figure 6--19 Controller Section of the Control Box90
Controller Programming Procedure91
Removing and Installing a Module91
Vent Position Sensor Service92
Temperature Sensor Service92
Sensor Checkout Procedure92
Sensor Replacement93
Sensor Re-Installation93
Figure 6--20 Sensor Types93
Figure 6--21 Sensor and Cable Splice93
Table 6--3 Sensor Temperature/Resistance Chart93
Figure 6--22 Supply Sensor Positioning94
Figure 6--23 Return Sensor Positioning94
Figure 6--24 Electronic Partlow Temperature Recorder96
Maintenance of Painted Surfaces97
Composite Control Box Repairs97
Introduction97
Cracks97
Inserts97
Door Hinge Inserts97
Figure 6--25 Door Hinge Repair98
Table 6--4 Crack, Chip & Hole Repair Kit98
Table 6--5 Insert Repair Kit98
Table 6--6 Drill Information98
Figure 6--26 Insert Location99
Communications Interface Module Installation100
Figure 6--27 Communications Interface Installation100
Table 6--7 Recommended Bolt Torque Values100
Table 6--8 R-134A Temperature - Pressure Chart101
Electrical Wiring Schematics102
Introduction102
Figure 7--2 SCHEMATIC DIAGRAM - Single Phase, Normal Evaporator Fan Capability104
Figure 7--3 SCHEMATIC DIAGRAM - Single Phase, Single Evaporator Fan Capability105
Figure 7--4 LEGEND -- Three--Phase Evaporator Fan Motor106
Figure 7--5 SCHEMATIC DIAGRAM - Three--Phase Evaporator Fan Motor107
Figure 7--6 SCHEMATIC DIAGRAM-Transfresh and Emergency Bypass108
Figure 7--7 SCHEMATIC and WIRING DIAGRAM - Electronic Partlow Recorder109
Figure 7--8 SCHEMATIC and WIRING DIAGRAM - Upper and Lower Vent Position Sensors110
Figure 7--9 WIRING DIAGRAM - Single Phase, Normal Evaporator Fan Capability111
Figure 7--10 WIRING DIAGRAM - Normal Evaporator Fan Capability with Bypass Module113
Figure 7--11 WIRING DIAGRAM - Single Phase, Single Evaporator Fan Capability115
Figure 7--12 WIRING DIAGRAM - Three--Phase Evaporator Fan Motor117

Brand	Carrier
Model	69NT40-551-500
Category	Refrigerator
Language	English

Carrier 69NT40-551-500 User Manual

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