Haier HB21T NN Service Manual

Service manual for refrigerator

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User manual (36 pages)

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Page 1 Features: 1.Chill drawer for delicatessen 2.Slide-out shelf for easy food access 3.Artificial Intelligent (AI) design 4.CFC-free and frost-free deep freezing enabled by efficient air cooling system 5.Air Curtain technology 6.Vitamin C technology for fresh food storage 7.Ice making Haier Group...
Page 2: Table Of Contents
CONTENTS SAFETY PRECAUTIONS----------------------------------------------------------------1-2 SPECIFICATIONS--------------------------------------------------------------------------3-4 PARTS IDENTIFICATIONS--------------------------------------------------------------5 DISASSEMBLY------------------------------------------------------------------------------6-13 CONTROL AND DISPLAY SYSTEM--------------------------------------------------14-18 Control and display panel----------------------------------------------------------14 Function adjustment and control principle-------------------------------------14-18 Fault Display--------------------------------------------------------------------------15 REFRIGERATION PRINCIPLE----------------------------------------------------------19 System flow chart--------------------------------------------------------------------19 System flow scenograph ----------------------------------------------------------19 CIRCUIT DIAGRAM ------------------------------------------------------------------------20 Brief principle diagram--------------------------------------------------------------20 Connect diagram---------------------------------------------------------------------20 SENSOR POSITION------------------------------------------------------------------------21 ELECTRICAL CONTROL PRINCIPLE-------------------------------------------------22 Overview--------------------------------------------------------------------------------22 Main Control Board of HB21T-----------------------------------------------------22...
Page 3: Safety Precautions
SAFETY RECAUTIONS Power supply: AC 220V/50HZ If the voltage fluctuates violently (beyond 187~242V), it is necessary to use a voltage stabilizer of 750W or above to prevent startup failure, damaged control board or compressor, or unusual noise. The appliance must be plugged into a dedicated outlet that is securely grounded.
Page 4 SAFETY RECAUTIONS To prevent risk of electromagnetic interference or other accidents, do not place any patch panel, voltage stabilizer and microwave oven on top of the refrigerator or use any electric appliance (unless recommended by the manufacturer) inside the refrigerator. Children are not allowed to play with the door or the bottle racks.
Page 5: Specifications
SPECIFICATIONS REFRIGERATOR Model HB21TNN Photo Commercial brand Haier REFRIGERATOR-FREEZER Product description Type of Appliance (FS= freestanding BI= built-in) Energy efficiency class Climate class (N= + 18-32 °C T=+ 18-43 °C) SN/N/ST Freezer compartment / Star rating Key features Gross capacity...
Page 6 Number Type (gr=grill/g=glass/p=plastic) Colour of shelves Adjustable Drawers: Number n°. Crisper: Salad crisper(s) transparent / white transparent Equipment & Accessories Control Panel: Control panel interior / exterior Exterior Thermometer interior / exterior Ex terior Control lamps green / yellow / red Over temperature ALARM LED / acoustic acoustic...
Page 7: Parts Identifications
PARTS IDENTIFICATIONS Refrigerator compartment Refrigerador light Vitamin C Drawer Dairy bin Dairy bin Shelf Wine shelf Vertical beam Movable board Cover of crisper Gallon bin Crisper Gallon bin Front cover of delicatessen drawer Delicatessen drawer Freezer compartment Icecream bin Semi-automatic icemaker Ice storage bin Freezer drawer...
Page 8: Disassembly
DISASSEMBLY 1. Removing and replacing the right door of refrigerator compartment Unscrew the upper right hinge cover by Unscrew the upper right hinge by means of means of screwdriver and then remove hexagonal screwdriver and then remove the hinge. the hinge cover. Remove the door and place it in a proper Remove the middle hinge if necessary.
Page 9 DISASSEMBLY Remove the door and place it in a proper Remove the middle hinge if necessary. position. Replace the door in a reverse sequence of removal. Removing & Replacing Freezer Drawer Pull out the freezer drawer entirely and Release the buckles on both sides and pull out the drawer door in the direction shown on the remove it from the refrigerator.
Page 10 DISASSEMBLY Removing & Replacing Freezer Door Handle Get 2 fasteners out of the accessory bag and place them in 2 reserved holes in the freezer door. Install a handle by attaching the reinforcing plate to the fasteners and then pushing the handle leftwards into its place.
Page 11: Installing Legs
DISASSEMBLY Installing Bottom T rim Open the door of refrigerator compartment and take out the bottom trim. Fasten it to the bottom of refrigerator with screws as illustrated. Installing Legs Take out the accessory bag containing the legs from the refrigerator compartment. Get the legs to be installed.
Page 12: Removing Crisper Cover
DISASSEMBLY Removing Crisper Cover Take out the crisper and put it away. Lift up the cover end (1) and remove it (2). Cleaning door bin Lift the bin up (1) and pull it towards you (2). Replace the bin in the reverse sequence of removal after cleaning.
Page 13 DISASSEMBLY A djustable partition wall of freezer drawer A movable partition wall is provided in the freezer drawer to divide the drawer into two parts. You may move the partition wall right or left to meet your storage needs. ı ˇ ı...
Page 14: Replacing The Light Bulb
DISASSEMBLY 15. Replacing the Light Bulb Bulb specifications: 220V~, 25W Socket: E14 (DO NOT use a bulb over 25W) To replace the light bulb: Screw hole 1. Unplug the appliance. Square Remove the front screw with a screwdriver. hole To remove the light shield, press the stopper at front out of the square hole.
Page 15: Disassembly
DISASSEMBLY 18. Icemaking 1. Pour water in the icemaker to 3/4 of its capacity and then place it in the freezer 2. To get ice cubes, turn the knobs on the icemaker respectively and the ice cubes will be collected in the ice storage bin. 3.
Page 16: Control And Display System
CONTROL AND DISPLAY SYSTEM 1. Control and display panel A……Refrigerator temperature control button G……Refrigerator temperature display B……Fast chill button H……Freezer temperature display C……Freezer temperature control button I…… Fast chill icon D……AI button J……Lock icon E……Fast freeze button K……Fast freeze icon F……Lock / unlock button L……AI icon 2.
Page 17: Fault Display
CONTROL AND DISPLAY SYSTEM Fault Display When a fault with a control or function is detected, the refrigerator temperature display and the freezer temperature display will disappear while the fault codes will be displayed, i.e. E0, E1, E2, F1, F2, F3, F5 and F6, etc. In this case, please call the service center for information and support.
Page 18: Fast Chill
CONTROL AND DISPLAY SYSTEM Fast Freeze This function is intended for retaining nutrients contained in the food stored in the freezer by freezing the food fully within a short period of time. Under the Unlock mode, the Fast Freeze button (E) may be tapped to display the Fast Free icon (K) and activate the Fast Freeze mode.
Page 19 CONTROL AND DISPLAY SYSTEM Temperature Setting & Regulation The default operation mode is AI.To set a temperature manually, the AI button (D) may be tapped to hide the AI icon (L). (See the AI Mode section on Page 14 for details) emperature setting &...
Page 20: Control And Display System
CONTROL AND DISPLAY SYSTEM Economic Display Control The display screen will go dark 30 seconds after the operation of control panel is finished. The display is restored when any control button is tapped or any door is opened. But such button operation will not change the present setting of the refrigerator.
Page 21: Refrigeration Principle
REFRIGERATION PRINCIPLE SYSTEM FLOW CHART ５４６３７２１ SYSTEM FLOW SCENOGRAPH...
Page 22: Circuit Diagram
CIRCUIT DIAGRAM Brief principle diagram 2. Connect diagram...
Page 23: Sensor Position
Sensor Position...
Page 24: Electrical Control Principle
Electrical Control Principle 1. Overview HB21T refrigerator electrical control principle: Whole wind cooling design, with controlling of fixed frequency compressor. Temperature in the fridge is controlled by the fridge sensor R controlling the switch of the air escaper.. Temperature in the freezer is controlled by the freezer sensor F controlling the operating of the compressor.
Page 25: Air Escaper Controlling Pinciple
CN8 Connects to the electromagnetic subassembly of distributor. Parts from left to right are, 1 Connects to freezer door switch.. Measurement of this point and null line gives the operation voltage (DC 220V) of freezer lighting; 2-4 is spare. 5-6 Connect to the defrost heater. Measurement of these two point gives the resistance (194±10Ω)of the defrost sensor and the operating voltage (AC 220V).
Page 26: Refrigerator Test Model
4. Refrigerator Test Model TEST1：For testing the capability of cooling! Hold the refrigerator temperature control button(A) and the freezer temperature control button(C) 3 seconds to enter into <PULL DOWN MODEL>, “T1T1” will show on the display screen and force appliance to cool down immediately : during this time the compressor run normally, fan motor run at a high speed and defrost heater is switched off .
Page 27: Defrosting Control
malfunction display of cooling fan motor. It will come back to normal display if motor in normal condition, or else display freezer fan motor malfunction still. (3) The cooling fan motor is always working at invariableness speed 1100RPM (12V). Conditions for switch-on Conditions for switch-off 1780RPM 1500RPM...
Page 28 fridge will light, but the defrosting process will go on, fast freezer or fast fridge mode will not execute until finishing this defrosting cycle. The surplus defrosting time is not reckoned in the time of fast freezer or fast fridge. After one defrosting cycle and the compressor and fan motor have stopped running more than 7 minutes, if the freezer sensor temperature is over the stopping point, the compressor will start running immediately.
Page 29: Troubleshooting
TROUBLESHOOTING Troubleshooting and Repair 1. Normal Phenomena—Not Troubles for Refrigerators In a domestic refrigerator, there is not only a complicated electric control system, but also a refrigerating system that is difficult to discern whether it is in a good working condition. Both the systems are related and affect each other.
Page 30 Causes for troubles occurring in refrigerators are closely related to the quality of components and workmanship in assembling by manufacturers as whether refrigerators are properly used and maintained .The parameters generally used to express the working conditions of a refrigerator include the temperature inside the refrigerator, operation rate, electric power consumption, noise level, and other functional indexes .If any one of these parameters is beyond its permissible range, this indicates that there is a fault or trouble in the refrigerator.
Page 31 if it sounds like “tong, tong…”, i.e., an impact sound inside the compressor, this means that a large quantity of wet vapor of refrigerant or refrigerating oil has come into the compressor cylinder; if it sounds like “dang, dang…”, a striking sound of metal parts inside the compressor ,this means that some moving parts have loosened (note to differentiate this sound from those formed during starting or stopping the compressor).
Page 32: Analysis Of Troubles And Troubleshooting
3. Analysis of Troubles and Troubleshooting A. Poor Refrigerating Effect The so-called “poor refrigerating effect “ refers to the fact that the refrigerator can operate and refrigerator normally, but the temperature in the refrigerator cannot drop to the prescribed value under the stipulated working conditions. In view of there are many causes for this phenomenon, we are going to discuss and analyze it in the following 7 aspects: 1) Leakage of refrigerant Analysis of Trouble...
Page 33 Remedy According to the operating procedures, it is mandatory to turn the machine off, and several minutes later, open the refrigerant charging tube and let the refrigerant escape from it, replace the dry filter, recharge refrigerant after evacuating, and then seal the charging port. 3) There is air left in the refrigerating system Analysis of Trouble Residual air in the refrigerating system will reduce its refrigerating efficiency .The prominent...
Page 34 confused. Generally speaking, you can make a judgment based on the frost formed on the evaporator. If the frost does not cover the evaporator, and moreover, it is loosely formed, you can make a judgment that the deterioration of refrigerating effect is due to the accumulation of refrigerating oil left in the evaporator tubing in case no other troubles have been found.
Page 35 Remedy Check the whole machine, particularly those locations, which are liable to leak. After leak points have been found, repair them or replace them with new parts according to specific circumstances, then evacuate the system and finally charge refrigerant. 2) Refrigerating system has been clogged a) Clogged with Ice Analysis of Trouble The dryness treatment for the major parts in the refrigerating system has been performed...
Page 36 Remedy Dismantle the system, remove the dry filter from it, purge the tubing with nitrogen, install a new filter, then evacuate it and finally charge it with refrigerant. C) Clogging in filter Analysis of Trouble Total clogging of a filter is rarely to occur. The paste-like matter formed from the substances filled into the system mostly causes this trouble or other dust after the refrigerator has been used for a longer time, or by the dirt accumulated gradually inside the filter.
Page 37 A)Too much refrigerant charged into the system Analysis of Trouble The phenomenon, such as loose frosting and poor refrigerating effect, may occur if excessive refrigerant has been charged into the system. Superfluous refrigerant will occupy a certain space of the evaporator, thus reduce its heat dissipating area, and the phenomenon of “liquid striking”...
Page 38 b) Overload of electric motor Analysis of Trouble Probably, too many things have been put into the refrigerator, and hence the thermal load exceeds its refrigerating capacity; or in case the power supply voltage drops considerably, the current flowing through the motor will increase drastically making the thermal protector actuate and the fuse blown, and hence the motor stops running.
Page 39 b) Check the compressor accessories, including its thermal protector and relay. In case the thermal protector is damaged, the compressor cannot be powered on. If the relay is out of order, the motor will not run and hum sound can be heard from it after the compressor is turned on, in that case, shut it down immediately, otherwise, the motor windings will be burned out in case this condition lasts longer.
Page 40 certain phase is low, this means that short circuit does exist in the windings and/or between turns, and insulation layers have been burned or deteriorated. A megametre can be used in this inspection, too. If the insulation resistance is lower than 2 M , this means that the insulation layer is already breakdown.
Page 41 Sometimes, the compressor will run continuously (for several hours or run without end), If the food placed in the refrigerator is not too much, there may be the following two situations: I) the refrigerator very low, this means that the control system is probably out of order; ii) the control system works normally, and there are troubles in the refrigerating system or other parts.
Page 42 Analysis of Trouble When the heat-insulation layer inside the case body deteriorates or the door seal is not closely touches the doorframe, the temperature in the refrigerator will rise and makes the compressor running continuously. Remedy Check the heat-insulation layer for its damaged parts; repair it to improve its heat-insulation property.
Page 43 power supply circuit have been inversely connected accordingly ,this makes the null line become a live wire . G. Stronger vibration and loader noise 1) Refrigerator placed improperly a) Uneven ground Uneven ground will cause the refrigerator to be placed unsteadily, causing stronger vibration and noise during its operation.

Haier HB21T NN Service Manual

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