Haier BD-478A Service Manual Download | Manualshive

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SYSTEM FLOW CHART

System Flow Chart

The refrigeration system of direct cooling single-system freezers

belongs to the category of a single-temperature and single-control

refrigerating system with only one evaporator and is controlled by a

single temperature control.

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Summary of Contents for BD-478A

Page 1: ...foam cover for efficient Temperature preservation Adjustable thermostat Superior insulation Efficient defrosted storage Designed for cafeterias restaurants and hotels Haier Group Manual No BD 478A Edi...

Page 2: ...ircuit Diagram 15 12 Maintenance Service and Trouble Shooting 1 System Troubleshooting 16 2 Common freezer problems 28 3 Service and technical requirements of R134a freezer 30 4 Application and mainte...

Page 3: ...Code Illumination and Series Introduction B D A B C D A The first letter of FREEZER in Chinese spelling B The first letter of FREEZER in Chinese spelling C Capacity Unit litre D Improve Series Number...

Page 4: ...ed storage Designed for cafeterias restaurants and hotels Low power consumption 20 less than the other similar freezers Imported high quality compressor and condenser large freezing capacity 1 5 times...

Page 5: ...478 Power Supply V Hz 220V 50Hz 220V 50Hz Unit Dimension W D H 1420 715 810 1690 715 810 Unit Weight Kg 72 78 Box Dimensions W D H 1495 765 870 1765 765 870 Box Weight Kg 84 91 Container Quantity 40HC...

Page 6: ...ower cord Always grasp the plug firmly and pull straight out from the outlet 4 Repair or replace immediately all electric service cords that have become frayed or otherwise damaged Do not use a cord t...

Page 7: ...designed for freestanding installation only 8 Do not operate your freezer in the presence of explosive fumes 9 Do not refreeze foods which have been thawed completely 10 Do not use any electrical devi...

Page 8: ...ENSION Net Dimension H a L W H Model BD 388A BD 478A Unit Dimension W D H 1420 715 810 1690 715 810 Dimension Door open 1420 715 1470 1690 715 1470 PDF created with pdfFactory trial version www pdffac...

Page 9: ...trong enough to support it fully loaded 3 When moving the freezer never tilt it more than a 45 degree angle This could damage the compressor and the sealed system 4 If the freezer is tilted let it sta...

Page 10: ...this is a dangerous practice since it provides no effective grounding for the freezer and may result in shock hazard Install Limitations l Do not install your freezer in any location not properly insu...

Page 11: ...freezer or experience an electrical outage allow 5 Minutes before plugging it back in Note If the freezer has been placed in a horizontal or tilted position for any period of time wait 24 hours before...

Page 12: ...aining place a tray beneath the outer drain plug Pull out the drain dial and rotate it so that the arrow points down ward This will let the water flow out into the tray Remove the drain plug from the...

Page 13: ...f direct cooling single system freezers belongs to the category of a single temperature and single control refrigerating system with only one evaporator and is controlled by a single temperature contr...

Page 14: ...ng it back in Note If the freezer has been placed in a horizontal or tilted position for any period of time wait 24 hours before plugging the unit in Adjustable temperature dial Your freezer will auto...

Page 15: ...arting the machine the thermostat will be closed the compressor will run When the temperature in the freezer is lower and reaches the value for closing the machine the thermostat will be open thus the...

Page 16: ...meter The normal value is several Ohm to tens of ohm If the resistance is zero means that there is a short in the freezer circuit or there is a short caused by a bad compressor or fan motor The reason...

Page 17: ...ge of motor connection terminals the connection terminals of fully enclosed compressor are made from high temperature soda glass sintered ceramics around the terminals are filled with a high polymer T...

Page 18: ...it If there is leakage please make the connections again and leave a piece of insulation paper under the screw 5 Leakage of fan because of too high humidity of freezer environment or a bad fan control...

Page 19: ...e refrigerant oil If there is leak there will be traces of oil at the leak points 12 1 4 Troubleshooting by sounds 1 When the freezer is working normal high pressure liquid refrigerant flows into the...

Page 20: ...the condenser s temperature is low too and there is only a small part warm In summer the temperature is high and the temperature of condenser cover is high too and the whole condenser is warm 2 The t...

Page 21: ...er decision should be made 12 1 6 System noise repair Normally there are two kinds of freezer noise one is the natural noise of compressor and fan and the other is the resonance noise or structural no...

Page 22: ...oise please clear the obstacles around the fan or adjust fan blades 6 If the fan supporter is loose and noise is caused please tighten 12 1 7 Poor freezing effect analysis and solutions 1 Check the po...

Page 23: ...nnot be sealed well Remove dirt and put on a little talcum powder 5 Frequent opening and extended opening of freezer door will reduce refrigeration ability 12 1 8 How to handle the seal bar for poor s...

Page 24: ...or Compressor damage may occur 12 1 10 How to know there is problem with compressor motor It is easy to find out motor problem by checking the resistance of coil The method is to connect the terminal...

Page 25: ...d stuffs in the freezer too much door opens too frequent and open time too long 4 The environment temperature is too high humidity too high airflow is impeded 5 The frost layer at the evaporator is to...

Page 26: ...refrigerant again 2 Clean the capillary or change filter Frost at evaporator is not full 1 There is some leakage of refrigerant 2 There is dirt block but not serious 3 Refrigeration quantity of compre...

Page 27: ...been mounted to position or changed during transportation Mount it again 12 1 12 Procedure for fan change 1 Switch off power and open the fan protection cover 2 Remove the fan bolts by using fork wre...

Page 28: ...contact of plug and socket is not well or the voltage is too low The knob of temperature controller is set to off position 2 In side factors Electrical problem of freezer normally caused by connectio...

Page 29: ...nection state for a long time and cannot be released in time at normal situation the motor starting coil will cut off in about 1s after starting This will make the coil temperature rising rapidly and...

Page 30: ...ad The reason is that the insulation around the motor windings bad 12 3 Service and technical requirements of a R134a freezer 12 3 1 Refrigeration equipment requirements The compressor condenser evapo...

Page 31: ...age occurs at low pressure end Check system pressure if the system has no pressure the freezer has to be scrapped and change with new one if there is pressure it is repairable 12 3 4 Changing procedur...

Page 32: ...to wipe away welding powder and flux 11 Connect the electrical controlling unit of compressor 12 Mount and adjust temperature controller 13 Switch on power for test run check unit operation 12 3 5 Co...

Page 33: ...es R134a as the refrigerant which is recognized internationally It has an ozonosphere depletion coefficient ODP 0 New climate type design commercial freezer uses wide temperature zone design At 38 100...

Page 34: ...then you can put food in If food is put in too early it may get damaged as the temperature is still high 6 Do not over pack refrigerator 7 Place food by reasonable sorts try to power open door frequen...

Page 35: ...ground connection for the freezer ground line is not allowed to connect to water pipe gas pipe etc 4 Once the freezer is cut off at least 5 minute must be waited for starting again otherwise the comp...

Page 36: ...er or soap water non corrosive neutral detergent is available After cleaning please make it dry by using cloth so as to avoid rust 6 Please clean the condenser compressor in the cabin and dust proof e...

Page 37: ...there is any damage 5 Check the power cord if there is any wear or damage please change 6 Take an avometer and check if the resistance of ground resistor is normal 7 Check the insulation by using if i...

Page 38: ...er 8 Philip screwdriver 9 Needle nose pliers notch pliers sealing pliers 10 Hansen valve 11 Tube cutters 12 5 2 Notice for use R134a filling equipment can only be used specially for R134a refrigerant...

Page 39: ...pment until really to proceed 2 Evacuation Connect recovery machine hoses to system fittings Switch on power Switch on motor Open all related valves Observe the pointer of vacuum meter when it is acce...

Page 40: ...serve the unit operation Switch off power 12 6 Freezer noise 12 6 1 Freezer noise sources Freezer noise comes from the expanding with heat and contracting with cold of compressor evaporator or condens...

Page 41: ...e sound The continuous buzz we heard is this kind of sound 2 When compressor is produced there must be clearance between components When freezer is running the existing of clearance will make some com...

Page 42: ...tic sound a hermetically sealed motor is relatively small 12 6 3 How is the sound of water flowing generated Answer When liquid refrigerant is flowing especially through the evaporator there will soun...

Page 43: ...d may occur at the following situations 1 Newly bought freezer the internal stress of materials has not been eliminated With time going on the stress of materials will disappear and it is less possibl...

Page 44: ...ssor cannot be started or noise will increase after starting and the wear of crankshaft will increase too It is better that freezer doesn t stop use Sometimes newly bought freezer also has this charac...

Page 45: ...freezer noise is made in national standard GB8059 1 87 family use freezer with the volume below 250L noise 52 dB A sound power level The noise at offices we stay everyday or other public places is muc...

Page 46: ...d is the sound power level Under the measuring conditions stipulated in national standard measure the freezer noise at four points take the average of indicated reading at greater noise situation calc...

Page 47: ...r and so their noises are different Even for same type freezers as the noise of compressors are different their differences to national standard 52dB A are not the same and the noises are different 12...

Page 48: ...e previous reasons freezer makes sound at starting and stopping 12 6 15 Why sometimes noise at far distance is greater than at near distance Answer Because the transfer of freezer noise has relations...

Page 49: ...of sound power level of freezer with the volume 250L and below measuring according to the stipulations in item 6 3 6 1 will not greater than 52dB A Sound power level noise of freezing freezer with fan...

Page 50: ...measurement point 1 2 3 4 measure the sound level by sound level meter A weighted Take the greater readings and calculate the average value The arithmetic average value of these four points is taken a...

Page 51: ...ation resistor cool state 5 electrical intensity 6 starting performance 7 ground resistor 8 sealing performance of refrigeration system 9 documents and accessories Spot tests for ex factory are 10 sto...

Page 52: ...set to 0 5g of yearly leakage check every position of refrigeration system Leakage at any point shall not greater than 0 5g Leakage inspection instrument normally used includes H 25 of American GE pro...

Page 53: ...ent is made in accordance with the stipulations The leakage current measured shall not exceed 1 5mA 12 8 2 6 Noise test This test is carried out at semi sound eliminating room The freezer is put to th...

Page 54: ...he stipulated environment temperature the fluctuation range is 0 5K Within the range of 2m heights away from the test platform the vertical temperature gradient shall not exceed 2K m Table 6 1 Differe...

Page 55: ...num resistor There are two types Put the platinum resistor directly into test pack M pack when measuring a Its temperature b Insert the platinum resistor into the center of four tin electroplated copp...

Page 56: ...and let the freezer running continuously Record the time needed for storage temperature tm to reach tm max in accordance with table 13 3 cooling temperature tm to reach 14 and the time the freezing t...

Page 57: ...est of storage temperature ice producing ability etc Table 6 3 Storage temperature of freezer Storage Cabin Climate type Climat e type Environme nt temp t1 t2 t3 tm max Cooling cabin Freezing cabin 10...

Page 58: ...Marketing model BD 388A 478A Exploded View Edition 2005 12 01 CARTON USER MANAUL LIST OF PARTS Parts list PDF created with pdfFactory trial version www pdffactory com...

Page 59: ...0 007 X BD 388A 1 0 189 0 189 X 12 0070810205 Outer cabinet BD 478A 1 0 189 0 189 X 13 0070201812 Insolution fill cap large BD 388A 478A 1 0 0 X 14 0070800197 Castor BD 388A 478A 6 0 168 0 200 15 0070...

Page 60: ...010 Ground screw BD 388A 478A 4 0 0 X 44 0074090308 Fan BD 388A 478A 1 0 063 0 100 45 0071210004 Engine room cover BD 388A 478A 1 0 0 X 46 0072130038 Screw BD 388A 478A 1 0 0 X 47 0077010036 Screw BD...

Page 61: ...e spare parts warehouse and should be marked with 3 possible damaged The spare part which is not often damaged like the easy damaged one and the customer may stock in the spare part warehouse accord w...

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