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NuAire Ultra Low Temperature Freezer Service Manual 

OM0290

 

OM0290 Revision 2 

May/2020 

Page  1  of 60 

Release Date:5/20/2020 

 

 

 

 

NuAire Ultra Low Temperature Freezer 

Service Manual

   

                             
 

Model 

Picture 

NU-99338JE/338JG/338JGA 
NU-99486JE 
NU-99578JE/578JGA/578JGA 
NU-99728JE/728JGA/728JGA 
NU-99828JE/828JG 

 

 

NU-99420JE 
NU-99420JG

 

                         

 

 

Summary of Contents for NU-99338JE

Page 1: ...90 OM0290 Revision 2 May 2020 Page 1 of 60 Release Date 5 20 2020 NuAire Ultra Low Temperature Freezer Service Manual Model Picture NU 99338JE 338JG 338JGA NU 99486JE NU 99578JE 578JGA 578JGA NU 99728...

Page 2: ...ure Names 6 6 Product Use Introduction Product Improvement Introduction 14 7 Main Technical Parameters of the Product 18 8 Case Prevention Measures Product Use and Daily Maintenance Knowledge 21 9 Sch...

Page 3: ...oor opening alarm low battery capacity alarm and power failure alarm 2 1 6 Two kinds of alarm methods acoustic silence alarm and light flicker alarm and multiple protection functions start delay prote...

Page 4: ...ensity thermal insulation layer good insulation effect 3 3 3 Independent multi layer sealing structure and heat insulation technology can avoid frosts effectively 3 3 4 Special design of low temperatu...

Page 5: ...Structure Internal Structure Diagram 4 1 Energy saving series NU 99486JE NU 99578JE 578JGA 578JGA NU 99728JE 728JGA 728JGA NU 99828JE 828JG 4 2 Slim line series NU 99338JE 338JG 338JGA 4 3 Chest seri...

Page 6: ...ructure Names 5 1 Display NU 99486JE NU 99578JE 578JGA 578JGA NU 99420JE NU 99420JG NU 99728JE 728JGA 728JGA NU 99828JE 828JG NU 99338JE 338JG 338JGA NU 99420JE NU 99420JG Locked Network Run Regulator...

Page 7: ...h cover Inner door PU foamed Inner door seals can be replaced External door PU foam with VIP External door seals can be replaced Recorder mounting panel Air intake grill Inner door latch remove the si...

Page 8: ...0 Page 8 of 60 Release Date 5 20 2020 Internal door handle Threading hole at the back of the freezer four channel structure External door handle Foam internal door Internal door sealing strip External...

Page 9: ...1 Electric cabinet NU 99486JE NU 99578JE 578JGA 578JGA NU 99728JE 728JGA 728JGA NU 99828JE 828JG NU 99338JE 338JG 338JGA Condenser fan RS 232 485Port Location Not Shown Control board High temp stage R...

Page 10: ...ctor Condenser sensor connector Board check button press this button to observe if all relay lights will take turn to light up Remote alarm connector Voltage calibration screw Connector for display bo...

Page 11: ...290 Revision 2 May 2020 Page 11 of 60 Release Date 5 20 2020 5 3 2 Junction box NU 99420JE NU 99420JG Battery Control board Compressor relay Terminal strip USB power board Filter Power switch Battery...

Page 12: ...tem NU 99486JE NU 99578JE 578JGA 578JGA NU 99728JE 728JGA 728JGA NU 99828JE 828JG NU 99338JE 338JG 338JGA High stage liquid accumulator High temperature filter dryer Low temperature filter dryer Perim...

Page 13: ...2 May 2020 Page 13 of 60 Release Date 5 20 2020 5 4 2 Refrigeration system NU 99420JE NU 99420JG High temperature compressor High stage filter dryer Condenser Low temperature stage filter dryer Conden...

Page 14: ...socket and the maximum current borne by the power socket shall exceed 16A and the socket shall be grounded reliably 6 3 4 When you switch on the freezer firstly turn on the battery switch in the elec...

Page 15: ...displayed alternatively on the display panel 4 When the condenser sensor has a failure the failure code E1 of the main sensor and the actual temperature are displayed alternatively on the display pane...

Page 16: ...istance K Temperature Resistance K Temperature Resistance K Temperature Resistance K 40 63 3 19 17 8 2 5 8 23 2 1 39 59 4 18 16 8 3 5 5 24 2 0 38 55 8 17 15 9 4 5 2 25 1 9 37 52 3 16 15 0 5 5 0 26 1 8...

Page 17: ...ge 17 of 60 Release Date 5 20 2020 140 43 9 70 72 3 0 100 0 130 48 0 60 76 3 10 103 9 120 52 1 50 80 3 20 107 8 110 56 2 40 84 3 30 111 7 100 60 3 30 88 2 40 115 5 90 64 3 20 92 2 50 119 4 80 68 3 10...

Page 18: ...812 893 1846 mm 32 0 35 2 72 7 in Net Gross Weight 300 330 kg 661 728 lb 345 380 kg 761 838 lb 238 278 kg 525 613 lb Material External Material Zinc coated steel Internal Material Zinc coated steel He...

Page 19: ...38 6 78 0 in Net Gross Weight 380 410 kg 838 904 lb Material External Material Zinc coated steel Internal Material Zinc coated steel Heat preservation Material Composite Insulation with VIP and fluor...

Page 20: ...on W D H 2130 870 1020 mm 83 9 34 3 40 2 in Net Gross Weight 310 357 kg 683 787 lb Material External Material Zinc coated steel Internal Material Stainless steel Heat preservation Material Composite I...

Page 21: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 21 of 60 Release Date 5 20 2020 7 2 Product Nameplate For example NU 99338JG...

Page 22: ...d 3 After confirming the freezer is normal according to operation steps in step 2 you can put goods into the freezer In principle goods to be stored at 60 shall not exceed 1 3 of the container capacit...

Page 23: ...is cut off so as to prevent from air entering the system and also the pipeline at each port shall be welded completely in 20min 4 Refrigerant R290 R170 is flammable refrigerant so the maintenance are...

Page 24: ...ant charge must be accurate even a tiny little difference may affect the refrigerating effect The R170 refrigerant pressure is high and the refrigerant charge is very low so the steel cylinder valve s...

Page 25: ...e g R290 R290 R170 NU 99338JE 220 240V 50Hz 135 60 NU 99338JG 208 230V 60Hz 145 60 NU 99338JGA 115V60Hz 135 60 NU 99486JE 220 240V 50Hz 150 105 NU 99578JE 220 240V 50Hz 150 5 90 NU 99578JG 208 230V 60...

Page 26: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 26 of 60 Release Date 5 20 2020 9 1 Circuit Diagram...

Page 27: ...ically and the temperature display will stop flickering if no key is operated in 10s which means that the value has been input into the computer Otherwise the setting is invalid The temperature set va...

Page 28: ...and alarm but the buzzer will not alarm if the ambient temperature exceeds 38 excluding 38 the indicator of Too High Ambient Temperature in the alarm display area will turn on and alarm and the buzze...

Page 29: ...tery will stop supplying power and the display screen no longer displays Under the condition that the battery can normally supply power if you want to cut off power supply please disconnect the AC pow...

Page 30: ...ting Adjustment When power is switched on for the first time after the display panel is unlocked if you press Function Selection and for 5 seconds the display panel will display 86 Then if you press o...

Page 31: ...Minute 5P for minute settings after completing settings long press SET for 5s to save and exit and then the inside temperature display area will normally show the inside temperature During the above m...

Page 32: ...low temperature stage the low temperature refrigerant is used Each part is a complete refrigerating system a cooling evaporator is used for linking the two parts together and it is an evaporator of n...

Page 33: ...the equipment will charge the storage battery according to the relevant requirement If the AC power has a failure the storage battery will supply power to the display panel for normal supply When the...

Page 34: ...e the refrigerator the user can consider disassembling the front cover of the compartment and open the external door by 180 Regarding the disassembly of the front cover of the compartment please see b...

Page 35: ...e the effective distance of the ultra low temperature freezer from the wall body Refer to the following figure for specific installation position Notice Follow the illustration to position and install...

Page 36: ...probe is more sensitive so the temperature rises more quickly when the door is opened Computer boards and temperature probes of other brands are increased with the slower temperature return function T...

Page 37: ...dry filter shall also be changed at the same time 7 Too low voltage of the user Check if the display panel voltage of the product is covered in the rated voltage scale 220V 10 Meanwhile use a multi me...

Page 38: ...oltage of the ambient temperature sensor is 4 9V the sensor has an open circuit when 0 1V it has a short circuit 1 Check if the terminal of the ambient temperature sensor is plugged in improperly or f...

Page 39: ...l After the freezer is switched on for 5min check if there is voltage output from the storage battery terminal on the main control panel and also the output voltage shall be 12V 11 Uneven temperature...

Page 40: ...amp No Check the buzzer and control circuit on the control panel Check if the input voltage works properly Yes Yes No Check if the low temp compressor is normal Yes Check if the low temp fan is normal...

Page 41: ...unning 5 Yes No normal Check the control circuit and LED lamps on the display panel The Alarm indicator flickers The Low temp Alarm indicator flickers Yes The freezer makes an acoustic alarm after the...

Page 42: ...in Ambient temperature sensor malfunctions just replace the ambient temperature sensor measure the resistance value of ambient temperature sensor before you make a judgement Power supply channel of di...

Page 43: ...nser sensor again Condenser sensor malfunctions replace the condenser sensor measure the resistance value of condenser sensor before you make a judgement Power supply channel or signal channel of cond...

Page 44: ...again Sensor PT100 malfunctions replace the inside box sensor PT100 m easure the resistance value of sensor PT100 before you make a judgement Power supply channel connecting the power socket or signal...

Page 45: ...ge sensor malfunctions replace it with a standby heat exchange sensor measure the resistance value of heat exchange sensor before you make a judgement Power supply chan nel connecting the power socket...

Page 46: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 46 of 60 Release Date 5 20 2020 Solution to Fans fail to work...

Page 47: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 47 of 60 Release Date 5 20 2020 Solution for checking high temperature compressor failing to start up...

Page 48: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 48 of 60 Release Date 5 20 2020 Solution for checking low temperature compressor failing to start up...

Page 49: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 49 of 60 Release Date 5 20 2020 Solution to condenser alarm fault...

Page 50: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 50 of 60 Release Date 5 20 2020 Solution to display panel NG fault...

Page 51: ...uct when system maintenance is over While ambient temperature ranges from 22 to 25 and the box is kept empty the time taken for the center temperature of the 3rd layer to drop from ambient temperature...

Page 52: ...0270101535 0270101712A 2 Shelf strip 0270100174A 3 Sensor shield 0270101337 0270100585 4 Sensor holder 0270101338 0270100584 Inside box main sensor PT100 0074091183 5 Shelf clip 0270100175 7 Beam 0270...

Page 53: ...7121 before 2018 1 11 2 Handle 0270100327E Handle accessory 0270100327F Lock latch plate 0270103284A Handle fix board 0270103284 after 2018 1 12 Lock 0270101174 before 2018 1 11 0270101174B after 2018...

Page 54: ...61 before 2018 1 11 0270200984 after 2018 1 12 Display board 0271800024 22 Outer door handle 1 Handle 0270100327B Handle fix board 0270100327C Lock latch plate 0270100327D Bearing 0070107121 before 20...

Page 55: ...erminal blocks Universal 0274300007 50 Wave filter 220V 0274000337 115V 0074600001A 51 Top cover of electric box Universal 0270100619 52 Power switch 220V 0274000098 115V 0274000098A 53 Battery switch...

Page 56: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 56 of 60 Release Date 5 20 2020 15 3 Refrigeration Compartment...

Page 57: ...70107359 30 Chart recorder 0074090520C 32 Caster 0070101872C 33 Right cover of cabin 0270100779A 0270102115 0270101761A 0270101595 34 Back cover of cabin 0270101205 0270102116 0270101720A 0270101559 3...

Page 58: ...NuAire Ultra Low Temperature Freezer Service Manual OM0290 OM0290 Revision 2 May 2020 Page 58 of 60 Release Date 5 20 2020 15 4 NU 99420JE JG...

Page 59: ...nal strip 0274300008A currency for new models 1 EA 26 Power switch 0274000098 1 EA 27 Battery switch 0074000074A 1 EA 28 Low temperature stage compressor 220V50Hz 0074000429T 1 EA Low temperature stag...

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