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. Perishable Cooling Unloader ControlDieselDuring perishable cooling the unloaders are energizedwhen the temperature approaches setpoint. If a supplyprobeispresenttheunloadersareenergizedwhenthesupply temperature decreases 5.4_F (3_C) belowsetpoint. It will stay unloaded until the supplytemperature rises above setpoint. If a supply probe is notpresent the unloaders are energized when the returntemperature decreases more than 9_F (5_C) abovesetpoint. It will stay unloaded until the returntemperature rises more than 14.4_F (8_C) abovesetpoint. With software revision 2.10 or higher the returnprobe logic is disabled for ambient temperature higherthan 90_F (32.2_C).StandbyDuring perishable cooling the unloaders are energizedwhen the control temperature reaches less than 2_F(1.1_C) above setpoint. The unloaders stay energizeduntil the control temperature reaches 2.5_F (1.4_C)above setpoint.c. Perishable Heating Unloader ControlDieselDuring perishable heating the front unloader isenergized when the control temperature increases to0.9_F (0.5_C) below setpoint. The unloader will stayenergized until the control temperature decreases to1.5_F (0.8_C) below setpoint.Note: These switch points may vary slightly dependingonthe amount of overshoot around setpoint.StandbyDuring perishable heating the unloaders are energizedwhen the control temperature increases to 1.5_F (0.8_C)below setpoint. The unloaders will stay energized until thecontrol temperature decreases to 2_F (1.1_C) belowsetpoint.Note: During standby operation the unit may energizeboth the front and rear unloaders in heat(2 cylinders).d. Frozen Unloader ControlDieselFor units with UltraFreeze refer to section 1.13.For units without UltraFreeze during frozen mode,heating is not allowed. The front unloader is energizedwhen the control temperature decreases to 1.5_F (0.8_C)above setpoint. The unloader will stay energized untilthecontrol temperature reaches 2_F (1.1_C) above setpoint.Note: During frozen mode only the front cylinder can beunloaded.StandbyFor units with UltraFreeze refer to section 1.13.For units without UltraFreeze during frozen mode,heating is not allowed. The front unloader is energizedwhen the control temperature decreases to 2_F (1.1_C)above setpoint. The unloader will stay energized until thecontrol temperature reaches 2.5_F (1.4_C) abovesetpoint.1.9.2 Suction Pressure Operation - Diesel EngineThe microprocessor will monitor suction pressure of therefrigeration system and control the unloaders tomaintain a maximum operating pressure. A suction9pressure transducer is used to signal the microprocessorwhen to load or unload the compressor.When the compressor is fully loaded it is operating on 6cylinders. When the front unloader UL1 is unloaded(energized), the unit operates on 4 cylinders. When UL1and the rear unloader UL2 are unloaded (energized), theunit operates on 2 cylinders. The front unloader, UL1,always unloades before the rear unloader, UL2.During the diesel heating and defrosting cycles, the rearunloader is locked out (loaded), forcing the compressorto always operate with at least four cylinders loaded.a. R-22 Refrigeration SystemAt ambient temperatures of 90_F (32.2_C) or belowWhen the system is operating in high speed and thesuction pressure is greater than 53 psig, both unloadersare unloaded. As the suction pressure drops below 52psig, the UL2 unloader is loaded. If the suction pressuredrops below 26 psig, the UL1 unloader is loaded.When the system is operating in low speed and the suctionpressure is greater than 56 psig, both unloaders areunloaded. As the suction pressure drops below 55 psig,the UL2 unloader is loaded. If the suction pressure dropsbelow 21 psig, the UL1 unloader is loaded.At ambient temperatures of 90_F (32.2_C) or higherAt ambient temperatures of 90_F or higher the unloadingsuction pressure settings relative to ambienttemperatures are a straight line.(Refer to chart below)SUCTIONPRESSURE(PSIG)R-22 DIESEL OPERATIONSUCTION PRESSURE UNLOADING60LOW SPEED (UL2)55504540353025HIGHSPEED(UL2)HIGH SPEED (UL1)20LOW15 SPEED10(UL1)80 90 100 110 120 130AMBIENT TEMPERATURE (_F)UL1 = FRONT UNLOADER, UL2 = REAR UNLOADERABOVE THE LINE = UNLOADED, BELOW THE LINE = LOADEDb. R-404A Refrigeration SystemAt ambient temperatures of 90_F (32.2_C) or belowWhen the system is operating in high speed and thesuction pressure is greater than 64 psig, both unloadersare unloaded. As the suction pressure drops below 64psig, the UL2 unloader is loaded. If the suction pressuredrops below 33 psig, the UL1 unloader is loaded.1-15 62-02461
1.1.1 HEAT/COOL MODEWhen the system is operating in low speed and the suctionpressure is greater than 65 psig, both unloaders areunloaded. As the suction pressure drops below 64 psig,the UL2 unloader is loaded. If the suction pressure dropsbelow 35 psig the UL1 unloader is loaded.At ambient temperatures of 90_F (32.2_C) or higherAt ambient temperatures of 90_F or higher the unloadingsuction pressure settings relative to ambienttemperatures are a straight line.(Refer to chart below)SUCTIONPRESSURE(PSIG)R-404A DIESEL OPERATIONSUCTION PRESSURES UNLOADING7065605550454035302520HIGHSPEED(UL2)LOW SPEED (UL1)HIGHSPEED(UL1)LOW SPEED (UL2)1580 90 100 110 120 130AMBIENT TEMPERATURE (_F)UL1 = FRONT UNLOADER, UL2 = REAR UNLOADERABOVE THE LINE = UNLOADED, BELOW THE LINE = LOADED1.9.3 Suction Pressure Operation - StandbyThe microprocessor will monitor suction pressure of therefrigeration system and control the unloaders tomaintain a maximum operating pressure. A suctionpressure transducer is used to signal the microprocessorwhen to load or unload the compressor.When the compressor is fully loaded it is operating on 6cylinders. When the front unloader UL1 is unloaded(energized), the unit operates on 4 cylinders. When UL1and the rear unloader UL2 are unloaded (energized), theunit operates on 2 cylinders. The front unloader, UL1,always unloades before the rear unloader, UL2.During the heating and defrosting cycles, the lowestpressure unloader is not locked out (loaded). This willallow the compressor to fully unload in standby.a. R-22 Refrigeration SystemAt ambient temperatures of 90_F (32.2_C) or belowWhen the system is operating and the suction pressure isgreater than 29 psig, both unloaders are unloaded. As thesuction pressure drops below 28 psig, the UL2 unloader isloaded. If the suction pressure drops below 10 psig, thethe UL1 unloader is loaded.At ambient temperatures of 90_F (32.2_C) or higherAt ambient temperatures of 90_F or higher the unloadingsuction pressure settings relative to ambienttemperatures are a straight line.(Refer to chart below)SUCTIONPRESSURE(PSIG)R-22 STANDBY OPERATIONSUCTION PRESSURES UNLOADING35302520151050REAR UNLOADERFRONT UNLOADER--- 580 90 100 110 120 130AMBIENT TEMPERATURE (_F)ABOVE THE LINE = UNLOADED, BELOW THE LINE = LOADEDb. R-404A Refrigeration SystemAt ambient temperatures of 90_F (32.2_C) or belowWhen the system is operating and the suction pressure isgreater than 57 psig, both unloaders are unloaded. As thesuction pressure drops below 56 psig, the UL2 unloader isloaded. If the suction pressure drops below 26 psig, thethe UL1 unloader is loaded.At ambient temperatures of 90_F (32.2_C) or higherAt ambient temperatures of 90_F or higher the unloadingsuction pressure settings relative to ambienttemperatures are a straight line.(Refer to chart below)SUCTIONPRESSURE(PSIG)R-404A STANDBY OPERATIONSUCTION PRESSURES UNLOADING60REAR UNLOADER5550454035302520FRONT UNLOADER1580 90 100 110 120 130AMBIENT TEMPERATURE (_F)ABOVE THE LINE = UNLOADED, BELOW THE LINE = LOADED62-024611-16
Page 7: LIST OF ILLUSTRATIONS (CONT’D)Fig
Page 10 and 11: 9SECTION 1DESCRIPTION1.1 INTRODUCTI
Page 12 and 13: 91123234564758961. Condenser Pressu
Page 14 and 15: 91. Condenser Pressure ControlSolen
Page 16 and 17: 91. King Valve2. Hot Gas Solenoid V
Page 18 and 19: 9165341. Evaporator Fan2. Expansion
Page 20 and 21: 943112 2200V/50hz230V/60hz380V/50hz
Page 22 and 23: MODELUltima, Phoenix Ultra,Ultra XL
Page 26 and 27: 1.9.4 Hot Gas Bypass Unloadera. Maj
Page 28 and 29: 91.10 MICROPROCESSOR CONTROLLERCOOL
Page 30: Manual Glow OverrideThe auto start
Page 33 and 34: 1.1.1 HEAT/COOL MODE1.10.7ALARM DIS
Page 35 and 36: 1.1.1 HEAT/COOL MODE1.10.10 DEFROST
Page 37 and 38: 1.1.1 HEAT/COOL MODEIf the battery
Page 39 and 40: 1.1.1 HEAT/COOL MODEFALLINGTEMPERAT
Page 41 and 42: 1.1.1 HEAT/COOL MODE1.14.2DataLink
Page 43 and 44: 1.1.1 HEAT/COOL MODE1.15 BATTERY CH
Page 46 and 47: 1.17 REFRIGERANT CIRCUIT DURINGHEAT
Page 48 and 49: 9EXTERNAL EQUALIZEREXPANSIONVALVEBU
Page 50 and 51: 3. Press the FUNCTION CHANGE key un
Page 52 and 53: Thedefrostmodemaybeinitiatedbythree
Page 54 and 55: ModeTable 2-2. Relay OperationDEPer
Page 56 and 57: INDICATION/TROUBLEPOSSIBLE CAUSESRE
Page 58 and 59: INDICATION/TROUBLE3.3.5Defrost Cycl
Page 60 and 61: INDICATION/TROUBLEPOSSIBLE CAUSESRE
Page 62 and 63: . Every 2000 Hour Maintenance --- N
Page 64 and 65: 4.3 ENGINE SERVICE AND COMPONENTS4.
Page 66 and 67: 4.3.5 Engine Crankcase BreatherThe
Page 68 and 69: 421. Evaporator/Condenser Fan V-Bel
Page 70 and 71: 4.5 SERVICING STANDBY CLUTCH (NDM)T
Page 72 and 73: 4.7 PUMPING THE UNIT DOWN ORREMOVIN
Page 74:
. Run the unit in cooling for ten m
Page 77 and 78:
. Solenoid Coil ReplacementNOTEThe
Page 79 and 80:
4.17 CHECKING AND REPLACING HIGHPRE
Page 81 and 82:
10. Dehydrate and evacuate the syst
Page 83 and 84:
4.23 REPLACING THE CONDENSER/ EVAPO
Page 85 and 86:
10. Install clutch on fan shaft ass
Page 87 and 88:
To check Phase Sequence Module:a. V
Page 89 and 90:
4.31 CONTROLLER SENSOR CHECKOUTAn a
Page 91 and 92:
M8 x 20 mm lg(6 Req’d) 18 ft-lbs
Page 93 and 94:
Table 4-6. R-404A Temperature---Pre
Page 95 and 96:
Figure 5-1. NDA-94A Electrical Sche
Page 97 and 98:
Figure 5-2. NDA-94A & NDA-94B Elect
Page 99 and 100:
Figure 5-3. NDA-94 Electrical Schem
Page 101 and 102:
Figure 5-4. NDM-94A EURO Electrical
Page 103 and 104:
Figure 5-5. NDM-94 (EURO) Electrica
Page 105 and 106:
Figure 5-6. NDM-94A Electrical Sche
Page 107 and 108:
Figure 5-7. NDM-94 Electrical Schem
Page 109 and 110:
Figure 5-8. NDM-94A --- 230v Phase
Page 111 and 112:
Figure 5-9. NDM-94 230v Phase Rever
Page 113 and 114:
Figure 5-10. NDM-94A --- 380v Phase
Page 115 and 116:
Figure 5-11. NDM-94 380v Phase Reve
Page 117 and 118:
Figure 5-12. NDA, NDM and NDX Elect
Page 119 and 120:
Figure 5-13. NDA, NDM and NDX Elect
Page 121 and 122:
SECTION 6MULTI-TEMP OPERATION AND S
Page 123 and 124:
6.5 MULTI-TEMP REFRIGERANT CIRCUITT
Page 125 and 126:
energized at 2.5_C above setpoint.
Page 127 and 128:
6.13 5KW GENERATOR MAINTENANCEThe 5
Page 129 and 130:
Table 6-4. 2 Compartment Reversible
Page 131 and 132:
Table 6-5. 3 Compartment Reversible
Page 133 and 134:
6-13 62---02461Figure 6-8. Electric
Page 135 and 136:
6-15 62---02461Figure 6-9. Electric
Page 137 and 138:
6-17 62---02461Figure 6-10. Electri
Page 139 and 140:
6-19 62---02461Figure 6-11. Electri
Page 141 and 142:
6-21 62---02461Figure 6-12 Electric
Page 143 and 144:
6-23 62---02461Figure 6-13 Electric
Page 145 and 146:
IndexIRemote Evaporator, 6-5Introdu
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