Carrier TRANSICOLD 69NT20-274 Operation And Service Download

Page: 6 / 182

Revised 8-6-93

TABLE OF CONTENTS (CONTINUED)

Section

Page

SERVICE

4-1

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4.1

Removing the Refrigerant

4-1

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4.2

Refrigerant Leak Checking

4-1

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4.3

Evacuation and Dehydration

4-1

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4.3.1

General

4-1

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4.3.2

Preparation

4-1

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4.3.3

Procedure

4-1

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4.4

Adding or Checking the Refrigerant Charge

4-2

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4.4.1

Checking the Refrigerant Charge

4-2

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4.4.2

Adding Refrigerant to System (Full Charge)

4-2

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4.4.3

Adding Refrigerant to System (Partial Charge)

4-2

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4.5

Replacing the Compressor

4-3

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4.6

Compressor Disassembly

4-4

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4.7

Compressor Reassembly

4-6

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4.8

Checking the Compressor Oil Level

4-7

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4.9

Checking or Replacing Moisture-Liquid Indicator

4-8

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4.10

Checking or Replacing the Filter-Drier

4-8

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4.11

Checking or Replacing High Pressure Switch

4-9

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4.11.1

Replacing High Pressure Switch

4-9

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4.11.2

Checking High Pressure Switch

4-9

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4.12

Servicing Quench Solenoid Valve (QV)

4-9

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4.13

Replacing the Evaporator Coil and Heater Assembly

4-9

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4.14

Replacing the Evaporator Fan and Motor Assembly

4-10

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4.15

Servicing the Evaporator Coil Heaters

4-10

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4.16

Condenser Coil

4-10

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4.17

Condenser Fan and Motor Assembly

4-10

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4.18

Recording Thermometer (Partlow)

4-11

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4.19

Recording Thermometer (Saginomiya)

4-12

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4.20

Rust Prevention and Maintenance of Painted Surfaces

4-13

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4.21

Servicing the Water-Cooled Condenser

4-13

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4.22

Checkout Procedure for Optional Power Transformer

4-15

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4.23

Temperature Controller and Recorder Sensor Checkout Procedure

4-15

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4.23.1

Replacing Temperature Sensor

4-15

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4.24

Servicing Suction Solenoid Valve (69NT40 ONLY)

4-16

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4.25

Servicing the Modulating Solenoid Valve

4-17

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4.26

Thermostatic Expansion Valve

4-18

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4.27

Evaporator Fan Motor Capacitors

4-19

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4.28

Humidistat

4-19

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4.29

Microprocessor Controller

4-20

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ELECTRICAL WIRING SCHEMATIC AND DIAGRAMS

5-1

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5.1

Introduction

5-1

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Summary of Contents for TRANSICOLD 69NT20-274

Page 1: ...Models 69NT20 274 69NT40 441 69NT40 444 69NT40 454 T 246 10 Downloaded from ManualsNet com search engine ...

Page 2: ...Downloaded from ManualsNet com search engine ...

Page 3: ...ration P O Box 4805 Syracuse N Y 13221 SERVICE MANUAL OPERATION AND ã Carrier Corporation 1993 D Printed in U S A 0593 CONTAINER REFRIGERATION UNIT MODELS 69NT20 274 69NT40 441 69NT40 444 69NT40 454 Downloaded from ManualsNet com search engine ...

Page 4: ...Downloaded from ManualsNet com search engine ...

Page 5: ...mmunications 1 23 1 13 9 Setting Function Codes Without AC Power Optional 1 24 1 14 USDA Battery Module Optional 1 25 1 15 USDA Cold Treatment Procedure 1 25 1 16 Nitrogen Feed Optional 1 26 1 17 Humidistat Optional 1 26 2 OPERATION 2 1 2 1 Pre Trip Inspection Before Starting 2 1 2 2 Starting and Stopping Instructions 2 1 2 3 After Starting Inspection 2 1 2 4 Unit Operation 2 2 2 4 1 Cooling Contr...

Page 6: ...h 4 9 4 12 Servicing Quench Solenoid Valve QV 4 9 4 13 Replacing the Evaporator Coil and Heater Assembly 4 9 4 14 Replacing the Evaporator Fan and Motor Assembly 4 10 4 15 Servicing the Evaporator Coil Heaters 4 10 4 16 Condenser Coil 4 10 4 17 Condenser Fan and Motor Assembly 4 10 4 18 Recording Thermometer Partlow 4 11 4 19 Recording Thermometer Saginomiya 4 12 4 20 Rust Prevention and Maintenan...

Page 7: ... 16 Partlow Recording Thermometer 4 11 4 17 Saginomiya Recording Thermometer 4 13 4 18 Water Cooled Condenser Cleaning 4 14 4 19 Sensor 4 15 4 20 Sensor and Cable Assembly 4 15 4 21 Suction Solenoid Valves Sporlan 4 16 4 22 Suction Solenoid Valves Alco 4 16 4 23 Modulating Solenoid Valve 4 17 4 24 Thermostatic Expansion Valve 4 18 4 25 Humidistat 4 19 4 26 Microprocessor Control Box 4 21 5 1 Elect...

Page 8: ...ng Schematic Model 69NT40 444 16 5 78 5 40 Electrical Wiring Diagram Model 69NT40 444 16 5 80 5 41 Electrical Wiring Schematic Model 69NT40 444 17 5 82 5 42 Electrical Wiring Diagram Model 69NT40 444 17 5 84 5 43 Electrical Wiring Schematic Model 69NT20 274 3 5 86 5 44 Electrical Wiring Diagram Model 69NT20 274 3 5 88 5 45 Electrical Wiring Schematic Model 69NT40 444 18 5 90 5 46 Electrical Wiring...

Page 9: ...fer to section 1 13 Once the temperature controller is set at a desired container temperature the unit will operate automatically to maintain the desired temperature within very close limits The control system automatically selects cooling holding or heating as necessary to maintain the desired temperature within the container WARNING Beware of unannounced starting of the evaporator and condenser ...

Page 10: ...9 1210 549 12 0 5 4 X X X 69NT40 444 10 1210 549 8 8 4 0 A X B 69NT40 444 11 1210 549 12 0 5 4 X X X 69NT40 444 12 1210 549 12 0 5 4 X X X 69NT40 444 13 1210 549 12 0 5 4 X X X 69NT40 444 14 1280 580 8 5 3 8 X X 69NT40 444 15 1400 635 12 3 5 6 X X X B 69NT40 444 16 1210 549 12 0 5 4 X X X 69NT40 444 17 1380 626 12 3 5 6 X X X B 69NT40 444 18 1210 549 12 3 5 6 X X X C 69NT40 444 19 1210 549 12 3 5 ...

Page 11: ...n Motor CM 7 Interrogator Connector 8 Power Cables and Plug 9 Serial Model No Plate Location 10 Discharge Service Valve 11 Compressor Sight Glass 12 High Pressure Switch HPS 13 Compressor Motor CP 14 Pressure Gauges Optional 15 Control Box 16 Fork Lift Pockets 17 Expansion Valve Location 18 Access Panel Evap Fan Motor 1 Figure 1 1 Refrigeration Unit Front Downloaded from ManualsNet com search engi...

Page 12: ...t DTT 7 Evaporator Fan Motor 2 EM2 8 Evaporator Coil 9 Heater Termination Thermostat HTT 10 Evaporator Coil Heaters 11 Drain Pan Heater DPH 12 Dummy Receptacle 13 USDA Probe Receptacle PR3 14 USDA Probe Receptacle PR1 15 Interrogator Receptacle 16 USDA Probe Receptacle PR2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figure 1 2 Refrigeration Unit Rear Panels Removed Downloaded from ManualsNet com search...

Page 13: ...ptional 10 Sight Glass 11 Supply Air Temperature Sensor STS 12 Supply Recorder Sensor SRS Optional 13 Suction Service Valve 14 Filter Drier 15 Pressure Relief Valve 16 Liquid Line and Charging Valve 17 Moisture Liquid Indicator 18 Quench Valve QV Solenoid 19 Quench Valve Thermostatic Expansion 20 Nitrogen Feed Optional 21 Receiver Optional UNITS WITH WATER COOLED CONDENSER UNITS WITH RECEIVER 1 3 ...

Page 14: ...al 9 Manual Defrost Switch MDS 10 Start Stop Switch ST 11 Microprocessor Control Panel Display 12 Control Transformer TR 13 Control Fuse F 6 amp 14 Fuse F3A F3B 5 amp Slow Blow 15 Voltage Switch VS Optional 16 Circuit Breaker CB 1 460V 17 Potential Transformer PT 18 Circuit Breaker CB 2 230V Optional 19 Evaporator Fan Motor Relay Low Speed ES 20 Battery Module Switch BMS Optional 20 Condenser Fan ...

Page 15: ...e evaporator fans circulate air throughout the container by pulling air in thetop ofthe refrigerationunit and directing the air through the evaporator coil where it is either heated or cooled and then discharged out the bottom of the refrigeration unit into the container Some units are equipped with two speed evaporator fan motors Refer to Table 1 1 When transporting perishable commodities the fan...

Page 16: ... 3450 rpm Voltage 380 460 vac 1 ph 50 60 hz g Fuses Control Circuit 6 Amps F Microprocessor 5 Amps Slow Blow F3A Battery Charger 5 Amps Slow Blow F3B 1 5 VOLTAGE SWITCH AND POWER TRANSFORMER OPTIONAL WARNING Do not attempt to remove power plug s before turning OFF start stop switch ST unit circuit breaker s and external power source Make sure the power plugs are clean and dry before connecting to ...

Page 17: ...r decrease the air flow volume to meet the required air flow b Air Sampling for Carbon Dioxide CO2 Level Loosen wing nuts and move cover until the arrow on the cover is aligned with the atmosphere sampling port label Tighten wing nuts and attach a 3 8 tube to the sampling tube If the internal atmosphere content has reached an unacceptable level the operator may adjust the cover opening to meet the...

Page 18: ...pen a Circuit Breaker s or b Fuse 6A or c Evaporator Fan Motor Internal Protector s IP EM 1 8 REFRIGERATION CIRCUIT Starting at the compressor the suction gas is compressed to a higher temperature and pressure When operating with the air cooled condenser the gas flows through the discharge service valve into the air cooled condenser Air flowing across the coil fins and tubes cools the gas to satur...

Page 19: ...condenser operation do the following Disconnectthewater supplyand thedischarge lineto the water cooled condenser The refrigeration unit will shift to air cooled condenser operation when the water pressure switch closes Refer to section 1 3 1 9 2 Water Cooled Condenser with Condenser Fan Switch CFS For operation of the refrigeration unit with the water cooled condenser with CFS do the following a C...

Page 20: ...ttern for units operating with the controller set point above 10_C 14_F This frost pattern is described below The temperature controller varies the amount of current tothe suctionmodulation valvecoil SMV which in turn increases or decreasesthe amountof restrictionin the suction line so that the net cooling capacity of the unit will match the cooling required to maintain the load at set point When ...

Page 21: ... open Power Supply Voltage Frequency and Line Currents Refrigerant Suction Discharge Condenser Temper atures Refrigerant Discharge Pressure Compressor Running Hours Time Remaining Until Defrost c Provide digital readout and ability to select the fol lowing data Defrost Interval _C or _F In Range Tolerance Time Delay Start Interval Start of Unit Current Limiting d Signal malfunction alarm light and...

Page 22: ...nit to the logic and relay boards Gold plated terminals are used to ensure reliable electrical connections and eliminate corrosion The microprocessor control box is designed to permit ease of installation and removal and allows rapid replacement of the microprocessor on board the ship This permits analysis and repair of the control center at more convenient repair areas aboard ship or elsewhere Al...

Page 23: ...After this time and at 0 2_C 0 4_F or greater below set point the compressor will be turned OFF The heaters will be energized if the temperature drops to 0 5_C 0 9_F below set point The heaters will de energize when the temperature rise to 0 2_C 0 4_F below set point The compressor will not restart until the temperature rise to 0 2_C 0 4_F above set point and the 6 minute time delay has been satis...

Page 24: ...essor can restart 1 13 4 Function and Data Codes There are 30 functions which the operator may access to examine the operating status of the unit To access these functions perform the following Press the code select key press an arrow key until the left window displays the desired code number see Table 1 4 The right window will display the value of this item for 5 seconds before returning to the n...

Page 25: ...ambient sensor AMBS measures the temperature outside the container It is a factor in determining which speed the condenser fans will use optional and it is also used as a diagnostic factor for determining the system load For locations of sensor see Figure 1 3 Code 10 Compressor Suction Temperature Measured just prior to the compressor suction service valve the compressor suctiontemperature isused ...

Page 26: ...5 hours The time interval of the first defrost will not begin counting down until DTT is closed At the time DTT closes or at power up if DTT is already closed the time interval to the first defrost cycle is entered into the microprocessor When the interval timer has counted down 2 5 hr the in range status of the unit is checked If out of range and the control temperature is greater than 5_C above ...

Page 27: ...nds the Enter key If an active alarm has been corrected the microprocessor may not detect this until the unit has been turned OFF and ON The OFF and ON action will cause a retest of all components Alarms TP00 and TP01 can only be cleared by first trip starting the unit simultaneously pressing the trip start key and hours since trip start key and then pressing the alarm reset and Enter keys The con...

Page 28: ...m list Thisalarmcanbereset byclearing thealarm list This can be done only if all alarms written in the list are inactive Alarm 53 Main Voltage Sensor Failure Alarm 53 is caused by a line voltage reading of less than 30V It is a display alarm with no associated failure action While Alarm 53 is active no range testing will be doneofthelinevoltageand for currenttest purposes the voltage will be assum...

Page 29: ...reset and Enter key ERR The microprocessor performs self check routines If an internal failure occurs an ERR 0 4 will appear on the display This is an indication the microprocessor needs to be replaced LO This message will be alternately displayed with the set point whenever the main voltage drops more than 20 of its proper voltage The unit may operate at even lower voltages but damage to motors m...

Page 30: ... a probe is in error even if P5 0 passed P6 2 Quench Valve Test NOTE Some models have a thermostatic expansion quench valve so quench valve test is NOT APPLICABLE for these models To see which models have a solenoid quench valve refer to Section 5 The compressor suction temperature is measured with the quench closed Modulation Valve is at 20 The quench is energized and the suction temperature drop...

Page 31: ...event its damage The battery is housed in a module that also contains a charger to maintainor restorebattery capacity when AC power is on This module is located on a stud plate in the lower left corner of the unit When the dehumidification mode is activated or de activated ie Code 32 is turned ON or OFF this status is stored in the DataCorder memory and reported at the next TIC Note All microproce...

Page 32: ... NOTE None ofthe harnessesare connected Theymust be field connected when the RMU is installed 1 13 9 Setting Function Codes Without AC Power Optional For units equipped with software Revision 106 or greater Battery Module Switch BMS and Battery Module or Disposable Batteries If the user wishes to enter a new set point or change the user selectable codes Refer to section 1 13 1 i without AC power h...

Page 33: ...egree of discharge charging for as little as one hour or as much as 24 hours could be required to extinguish the light Charging for 4 to 6 hours after light is extinguished is required to fully charge battery 1 15 USDA COLD TREATMENT PROCEDURE Sustained cold temperature has beenemployed asan effective postharvest method for the control of the Mediterranean and certain other tropical fruit flies Ex...

Page 34: ...t a Carrier service representative for details 1 16 NITROGEN FEED Optional Thepurposeoftheoptionistoprovide away toinject nitrogen into the air stream of the unit This is done by connecting a nitrogen line to the quick connect on the front of the unit with a 1 4 nipple conforming to the MIL C 4109 The nitrogen can then be feed into the unit withamaximumpressureof35 PSIwhich givesa flowrate of 19 2...

Page 35: ...TURE 1 5_C 2 7_F 1_C 1 8_F 0 5_C 0 9_F 20_C 20_C 1 5_C 2 7_F 1_C 1 8_F 0 5_C 0 9_F COOLING AIR CIRCULATION ONLY COOLING NOTE For In Range Tolerance Refer to section 1 13 4 Code 29 Figure 1 9 Controller Set Point Below 10_C 14_F Downloaded from ManualsNet com search engine ...

Page 36: ...C 0 9_F 20_C 20_C 1 5_C 2 7_F 1_C 1 8_F 0 5_C 0 9_F HEATING HEATING MODULATING COOLING AIR CIRCULATION ONLY AIR CIRCULATION ONLY MODULATING COOLING NOTE ForIn RangeTolerance Referto section1 13 4 Code29 Figure 1 10 Controller Set Point Above 10_C 14_F Downloaded from ManualsNet com search engine ...

Page 37: ...h chart Then close door e Open Saginomiya recording thermometer if so equipped door and do the following 1 Check Chart drive battery condition Refer to section 4 19 2 Liftstylus pen by pushingin thestylus lifterand rotating the lifter clockwise raising stylus at same time until lifter locks in position 3 Install new chart on recording thermometer making sure chart is under the four corner tabs Rel...

Page 38: ... fan motors energized Also at this time the cool light is illuminated When the air temperature decreases to a tolerance above set point relay TI energizes and the in range light is illuminated Refer to section 1 13 4 Code 29 If the air temperature continues to fall modulating cooling starts at approximately 0 2_C 0 4_F above set point The modulating valve will have a variable current up to 1 30 am...

Page 39: ...2 3 TO CONTROL TRANSFORMER Energized Circuit De energized Circuit Figure 2 1 Cooling Downloaded from ManualsNet com search engine ...

Page 40: ...decreases to the in range tolerance below set point relay TI and the in range light de energize after 15 minutes time delay and willremain de energized until the supply air increases to a tolerance below set point Refer to section 1 13 4 Code 29 When the temperature rises to 0 2_C 0 4_F below set point TH opens heating off and the system again enters the holding zone The compressor and condenser f...

Page 41: ...F defrostterminationthermostat DTT opens tointerrupt the defrost cycle and the unit returns to its normal function The 54 5_C 130_F heat termination thermostat HTT will open the circuit if the defrost mode does not terminate at 24_C 75_F The controller will terminate defrost if termination does not occur within 1 0 to 1 5 hours depending on voltage An alarm will be given of a possible DTT failure ...

Page 42: ...ergized Heaters De energized De energized Energized Energized Energized Evaporator Fan Motors Energized Energized Energized Energized De energized Table 2 2 Electrical Control Positions Below 10_C 14_F CONTROL CIRCUIT COOLING HOLDING ZONE Dehumidifica tion HEATING DEFROST Compressor Contactor C Energized De energized De energized Condenser Fan Motor Con tactor CF Energized De energized De energize...

Page 43: ...T RUNS BUT HAS INSUFFICIENT COOLING Compressor Compressor valves defective 4 5 Refrigeration System Abnormal pressures 3 7 Temperature controller malfunction 3 9 Evaporator fan or motor defective 4 14 Modulating solenoid valve malfunction 4 25 Suction solenoid valve malfunction 1 11 4 24 3 3 UNIT OPERATES LONG OR CONTINUOUSLY IN COOLING Container Hot load Normal Defective box insulation or air lea...

Page 44: ...troller malfunction 3 9 Defective wiring Replace Loose terminal connections Tighten Low line voltage 1 5 3 5 UNIT WILL NOT TERMINATE HEATING Unit fails to stop Temperature controller improperly set Reset heating Temperature controller malfunction 3 9 Heater termination switch remains closed along with the heat relay 4 13 3 6 UNIT WILL NOT DEFROST PROPERLY Will not initiate Defrost timer malfunctio...

Page 45: ...cted air flow 3 10 Excessive frost on evaporator coil 3 6 Evaporator fan s rotating backwards 4 14 4 27 3 8 ABNORMAL NOISE OR VIBRATIONS Compressor Loose mounting bolts Tighten Worn bearings 4 5 Worn or broken valves 4 5 Liquid slugging 3 11 Insufficient oil 4 8 Condenser or Bent loose or striking venturi Check Evaporator Fan Worn motor bearings 4 14 4 17 Bent motor shaft 4 14 4 17 3 9 TEMPERATURE...

Page 46: ...uid slugging in Pin and seat of expansion valve eroded or compressor held open by foreign material 4 26 Fluctuating suction Improper bulb location or installation 4 26 pressure Low superheat setting 4 26 c 3 12 WATER COOLED CONDENSER OR WATER PRESSURE SWITCH MALFUNCTION High discharge Dirty coil 4 21 pressure Noncondensibles Condenser fan switch CFS If used in position 0 when water is not circulat...

Page 47: ...t common are copper plating acid sludge formation freezing up of metering devices by free water and formation of acids resulting in metal corrosion 4 3 2 Preparation a Evacuate and dehydrateonly afterpressure leaktest Refer to section 4 2 b Essential tools to properly evacuate and dehydrate any system include a vacuum pump 8 m H 5 cfm volume displacement P N 07 00176 01 and electronic vacuum gauge...

Page 48: ...fer to section 4 4 3 Units equipped with air cooled condenser only partially block the condenser coil inlet air starting from the front of the condenser coil Increase the area blocked until the compressor discharge pressure increases to approximately 13 kg cm 190 psig with the container temperature about 2_C 35_F or 11 kg cm 160 psig with the container temperature about 18_C 0_F Allow the system t...

Page 49: ...kit must be ordered as a separate item when ordering replacement compressor Appropriate installation instructions are included with kit 5 Refer to Table 4 1 and Table 4 2 for applicable compressor wear limits and torque values a Remove the protective guard from lower section of the unit b If the compressor is inoperative and the unit still has refrigerant pressure Remove refrigerant Refer to secti...

Page 50: ...using the discharge valve hold down capscrews as jack screws through the tapped holes of the valve plate after the valve stops and valves have been removed Remove the valve plate gasket See Figure 4 4 d Turn the compressor over on its side and remove the bottom plate Remove the bolts and connecting rod caps See Figure 4 5 Match mark each connecting rod cap and connecting rod for correct reassembly...

Page 51: ...bly must be replaced Replacement parts for the pump are not available 2 1 3 4 1 Oil Pump Bearing Head 2 Thrust Washer Gear Pump Only 3 Oil Pickup Tube 4 Oil Inlet Port Figure 4 7 Gear Oil Pump and Bearing Head g Be very careful not to damage the motor windings when removing the motor end cover as the cover fits over the winding coils Remove all capscrews except one in the top of the cover Then whi...

Page 52: ... tighten the terminal bushing nut only enough to stop the escape of gas Do not tighten until terminal bushing is flush with the mounting plate The tightening torque used at the factory is 0 21 to 0 23 mkg 18 to 20 inch pounds maximumto preventdamage tothe plasticparts 12 11 10 9 7 5 3 1 2 4 6 8 6 NOTE Parts shown are for one terminal 1 Terminal Bushing Nut 2 Lock Washer 3 Terminal Washer 4 Outer T...

Page 53: ...gasket on the compressor crankshaft Carefully push oil pump on by hand ensuring that the bearing head mounts flush to the crankcase body The top of the bearing head is marked on the mounting flange b Align the gasket and install the eight capscrews inthe mounting flange c Install the drive segment with the two capscrews and lock washer d Insert the oil feed guide with the large diameter in Insert ...

Page 54: ...4 8 b through the suction service valve flange cavity or by removing the oil fill plug See Figure 4 2 Some compressorshave theoil plug located on the crankcase at the right or left side of the oil pump d To Remove Oil From an 06DR Compressor 1 If the oil level recorded in step a 3 is above 1 2 of the sight glass oil must be removed from the compressor 2 Close frontseat suction service valve and pu...

Page 55: ...to decrease the pressure The switch will close at 13 kg cm 190 psig 4 12 SERVICING QUENCH SOLENOID VALVE QV NOTE This section is NOT APPLICABLE to models having a thermostatic expansion quench valve To see which Models have a solenoid quench valve refer to Section 5 Replacing Solenoid Valve Coil The coil may be removed without removing the refrigerant Remove screw lockwasher and coil Disconnect le...

Page 56: ...g and cable a Remove the lower access panel Figure 1 1 by removing the T I R locking device lockwire and mounting screws b Determine which heater s need replacing by checking resistance on each heater as shown in section 1 4 e c Remove hold down clamp securing heaters to coil d Lift the U portion of the heater with opposite end down and away from coil Move heater left or right enough to clear the ...

Page 57: ...ontroller and other end in the meter Always check resistance thermometer before using Refer to para b Ohmmeter 1 Place one probe of ohmmeter in the middle of the receptacle provided on the chart platen Figure 4 16 and ground other probe to unit 2 Note reading of meter and using Table 4 3 convert resistance to temperature b Checking Resistance Thermometer Calibrate the resistance thermometer by com...

Page 58: ...er temperature will actually be higher if a leak develops in the flange capillary or bulb To replace the recording thermometer element 1 Turn unit OFF and disconnect power source 2 Remove upper back panel Remove bulb clamps securing bulb to unit 3 Remove two flange screws from recording thermometer and feed capillary and element through the unit 4 Push replacement bulb end and capillary through th...

Page 59: ... how to control and conclude the de scaling operation by rinsing and neutralizing equipment before putting it back into service Their knowledge of metals types of scale water conditions and de scaling techniques will be invaluable to you The water cooled condenser is of the shell and coil type with circulating water through the cupro nickel coil The refrigerant vapor is admitted to the shell side ...

Page 60: ... to soak in the tube coils for several hours periodically pump circulating it with an acid proof pump An alternate method may be used whereby a bottle See Figure 4 18B filled with the solution and attached to the coils by a hose can serve the same purpose by raising and lowering of the bottle The solution must contact the scale at every point for thorough de scaling therefore ensure that no air po...

Page 61: ...nt size to completely immerse bulb with ice cubes or chipped ice then filling voids between ice with water and agitating until mixture reaches 0_C 32_F as shown by a laboratory thermometer b Start unit andcheck airtemperature data readouton the microprocessor control panel You should have a reading of 0_C 32_F if not continue on to the following step c Turn unit OFF and disconnect power supply d R...

Page 62: ...off remaining refrigerant 4 Remove enclosing tube and locknut assembly The gasket is inside the enclosing tube 5 Remove seat disc from inside of body and check for obstructions and foreign material 6 Place the seat disc into the valve body with the smaller diameter end facing up 7 Install stem and plunger item 7 Figure 4 21 8 Place the enclosing tube locknut over the enclosing tube Install spacer ...

Page 63: ...of wiring for damaged or exposed wires Replace where necessary 3 Setting the digital ohmmeter for low rangecheck coil s resistance If coil s resistance is below 5 ohms it is recommended to be replaced New coils have an approximate resistance of 7 6 ohms at 25_ C 77_ F The chart below gives the resistance of a new coil at various ambient temperatures Ambient Temperature Cold Coil 10_ F 6 45 ohms 40...

Page 64: ...aper before installing bulb to ensure proper heat transfer Strap thermal bulb to suction line making sure bulb is firmly against suction line The bulb is located in the 4 o clock position on the suction line 4 Check superheat See Table 4 6 Superheat setting is 4 4 to 5 5_C 8 to 10_F at 0_C 32_F container temperature c Checking Superheat NOTE It is not recommended adjusting internal adjustable valv...

Page 65: ...capacitors are 1 Direct replacement 2 volt ohmmeter and 3 capacitor analyzer 1 Direct replacement of capacitor with one of the same value 2 Volt ohmmeter set on RX 10 000 ohms Connect ohmmeter leads across the capacitor terminals and observe the meter needle If the capacitor is good the needlewillmakea rapidswing towardzero resistanceand then gradually swing back toward a very high resistance read...

Page 66: ... the controller on the static mat If arc welding is to be performed on the unit it is not necessary to remove controller Simply disconnect all connectors from controller and remove ground lead going to I O board 5 At this point if you are servicing the refrigeration unit you are free to remove the ground strap from your wrist and complete your work 5a Upon completion of your service work put the w...

Page 67: ...CORDER Cool Heat Defrost Alarm AIR TEMP Data 1 2 3 4 5 6 1 Screw 2 Spacer 3 Cover 4 Microprocessor Control Box 5 Screw 6 Microprocessor Control Panel Figure 4 26 Microprocessor Control Box Downloaded from ManualsNet com search engine ...

Page 68: ...5 0 0635 Throw 28 CFM 0 7354 18 6792 0 7334 18 6284 CRANKPIN DIAMETER 1 3735 34 8869 0025 0 0635 Throw 37 CFM 0 9698 24 6329 0 9678 24 5821 CRANKPIN DIAMETER 1 3735 34 8869 0025 0 0635 Throw 41 CFM 1 072 27 2288 1 070 27 1780 THRUST WASHER Thickness 28 37 CFM 0 145 3 6830 0 1440 03 6576 0250 0 6350 THRUST WASHER Thickness 41 CFM 0 154 3 9116 0 1520 03 8608 0250 0 6350 CYLINDERS Bore 2 0010 50 8254...

Page 69: ... Oil Pump Drive Segment 12 16 1 66 2 21 Unloader Valve Cover Plate Plate End 16 20 2 21 2 77 Bearing Head 5 16 18 16 20 2 21 2 77 Terminal Block Cap Screws 5 16 18 20 30 2 77 4 15 Suction Valve 20 30 2 77 4 15 Discharge Valve Pump End Bearing Head 3 8 16 40 50 5 53 6 92 Bottom Plate Crankcase Compressor Foot 3 8 16 40 50 5 53 6 92 Cylinder Head 7 16 14 55 60 7 61 8 30 Motor End Cover Crankcase 5 8...

Page 70: ... 0 32 100 039 25 77 109 9 05 SENSOR RTD PART NO 12 01119 00 0 32 100 039 25 77 109 7 05 SENSOR RTD PART NO 12 00306 00 0 32 100 039 25 77 109 9 05 SENSOR Thermistor PART NO 12 00278 01 0 32 32 650 91 25 77 10 000 50 Table 4 5 Recommended Bolt Torque Values BOLT DIA THREADS TORQUE MKG FREE SPINNING 4 6 8 10 1 4 5 16 3 8 7 16 1 2 9 16 5 8 3 4 40 32 32 24 20 18 16 14 13 12 11 10 5 2 in lbs 9 6 in lbs...

Page 71: ...3 8 4 49 4 40 10 23 4 5 32 31 70 21 70 2 4 94 4 84 8 22 5 4 38 37 75 24 77 0 5 41 5 31 6 21 6 3 44 43 80 27 84 2 5 92 5 81 4 20 7 2 51 50 85 29 91 8 6 45 6 33 2 19 8 2 58 57 90 32 99 8 7 02 6 88 0 18 9 2 65 63 95 35 108 2 7 61 7 42 2 17 10 2 72 70 100 38 117 2 8 24 8 08 4 16 11 2 79 77 105 41 126 6 8 90 8 73 6 14 12 3 86 85 110 43 136 4 9 59 9 40 8 13 13 5 95 93 115 46 146 8 10 32 10 12 10 12 14 6...

Page 72: ...er plug s disconnected before working inside the control box CAUTION Overheating and cycling of heaters by HTT will result if unit is left in a defrost condition step 4 after all frost has been melted from the evaporator coil and water ceases running from the drain hose NOTES 1 If microprocessor controller alarm functions remain operational manual override jumpering will result in false alarms bei...

Page 73: ...e the power plugs are clean and dry before connecting to any power receptacle WARNING Make sure power to unit is OFF and power plug disconnected before replacing the compressor WARNING Do not use a nitrogen cylinder without a pressure regulator Do not use oxygen in or near a refrigeration system as an explosion may occur WARNING Always turn OFF the unit circuit breaker CB1 and disconnect main powe...

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