Midea WHS-169WES1, Service Manual

Page 1: ...Refrigerator Service Manual Model WHS 169WES1 Features Energy efficiency Micro foam technology Low noise operation Thick insulation for energy efficiency Latest No 2 microbiological technology 0 ...

Page 2: ...ents 1 2 Product Code Illumination and Series Introduction 2 3 Specifications 3 4 Safety Precautions 4 5 Function Schedule 7 6 System Flow Chart 8 7 Circuit Diagram 9 8 Maintenance Service and Troubleshooting 10 9 Exploded View 30 10 List of Parts 31 1 ...

Page 3: ...WHS 169WES1 131 Color Black Power Supply V Hz 115V 60HZ Rated Input Power W 87 Power Consumption kWh Y 358 Net Weight 43 lbs Gross Weight lbs Unit Dimension DxWxH in Packing Dimension DxWxH in Container Quantity 40HQ PCS 49 21 4x25x34 23x24 2x35 227 3 ...

Page 4: ...Safety Precautions Safety Precautions 4 ...

Page 5: ...Safety Precautions 5 ...

Page 6: ...Safety Precautions 6 ...

Page 7: ...Function Schedule Function Schedule Energy efficient Micro foam technology Low noise operation Thick insulation for energy efficiency 7 ...

Page 8: ...System Flow Chart System Flow Chart 1 Schematic diagram of System Flow Chart Flow sequence 1 2 3 4 5 1 8 ...

Page 9: ...Circuit Diagram 1 Schematic Circuit Diagram Circuit Diagram 9 ...

Page 10: ...r five minutes and turning back on Check and repair according to The compressor does not work chart YES Does compressor run naturally and is condenser cooling too slowly YES Blocked by ice or debris Change filter and refrigerant Refrigerant is leaking Check NO and repair The correct amount of refrigerant should be added to unit when recharging 10 NO ...

Page 11: ... cooling capacity insufficient NO Check and repair according to the Cooling capacity is insufficient chart YES 1 Was the thermostat set to the coldest setting 2 Is the ambient temperature too high or the refrigerator near a heat source 3 Was the door opened too many times or is there too much food inside NO Adjust and instruct owner how to use YES Check and repair the main control panel 11 ...

Page 12: ...hooting 3 Cooling capacity is insufficient Cooling capacity is insufficient Is the ambient temperature lower than 60 8 F YES Is the thermostat correct NO Is refrigerant leaking YES NO Adjust and instruct owner how to use YES Repair 12 ...

Page 13: ...ce connected to a power source NO Repair YES YES Is the ambient temperature lower than 60 8 F YES YES Is the thermostat NO correct Adjust and instruct owner how to use Does the control panel have a 220V power output NO Check and repair the control panel YES Does the compressor have a 220V power output NO Check all power cords YES Check and repair compressor accessories 13 ...

Page 14: ...he compressor has stopped running the refrigerant will flow for some time so this sound is normal B When the compressor starts running a clicking sound can often be heard which is produced by the motion of deadweight start relay The compressor motor will produce a slight and uniform sound while it is running This sound is not easy to hear in the daytime but it can be heard at night C The compresso...

Page 15: ...e technicians can correctly locate issues and take reasonable measures based on their comprehensive analysis of problematic characteristics and of various kinds of refrigerators Three Checkup Essentials 1 Look a Check the refrigerating system tubing for cracks and welded parts for leaks If there is a leakage an oil stain will appear b Check the suction and exhaust pressure values high and low pres...

Page 16: ...left part depending on the type of condenser coil This indicates that the refrigerant is circulating properly If the condenser is not hot this means the refrigerant is leaking If the condenser is hot for only a few minutes and then cools down this means that the filter and capillary are clogged If the forced air cooling condenser has hot air blowing out the system is out of order b Feel the filter...

Page 17: ...haust gas temperature The exhaust tube will be rather hot and a continuous gas flowing sound from the outlet of the capillary will be louder than normal Little to no frost will appear on the evaporator After shutting down the balance pressure in the system is lower than the saturation pressure corresponding to the ambient temperature Solution If there is a refrigerant leak do not rush to recharge ...

Page 18: ... off After a few minutes open the refrigerant charging tube let refrigerant escape replace dry filter recharge refrigerant after evacuating and seal charging port 3 Air left in the refrigerating system Analysis of Problem Residual air in the refrigerating system will reduce its refrigerating efficiency The main effects are a higher temperature in the segment from the compressor outlet to the conde...

Page 19: ...ing cycles refrigerating oil residue may remain in the evaporator tubing However if there is a considerable amount of refrigerating oil in the evaporator the heat conduction effect will be severely affected which will cause poor refrigeration effect Solution It is sometimes difficult to determine if this issue is caused by refrigerating oil residue in the evaporator tubing because it tends to be c...

Page 20: ... timely manner this can result in the refrigerant completely leaking out There are two kinds of leakage a Slow leakage When a refrigerator has not been used in a long time the refrigerant might gradually leak out If in the course of operating the refrigerator it gradually becomes not as cold as normal and eventually does not refrigerate there is a slow leakage b Fast leakage All of the refrigerant...

Page 21: ...n and recharge the system with filtered refrigerant Another method is to connect a filter with moisture absorbers such as silica gel or anhydrous calcium chloride to the refrigeration system Afterward replace the filter evacuate it and recharge with refrigerant 3 Refrigeration system is clogged with dirt Analysis of Problem Coarse grained dirt and refrigerant oil tend to settle in and clog the cap...

Page 22: ...Next feel the compressor casing to determine if it is too hot Then with pressure gauges measure the pressures at the high and low pressure ports of the compressor If the gas suction valve block is broken the suction pressure will be extremely high and its gauge pointer will swing violently If the gas discharge valve block is broken the discharge pressure will be extremely high and its gauge pointe...

Page 23: ...ystem Generally there are three possibilities i the air was sucked into the system during a careless repair ii it was not completely purged when evacuating the system or iii there are leak points at the low pressure end of the refrigerating system Leak points appear mainly in low temperature parts because the evaporation temperature is lower in low temperature devices it is easier for air to enter...

Page 24: ...stops When the temperature in the refrigerator reaches its desired value the thermostat will shut down the compressor automatically Never confusion this normal operation as a malfunction Be sure to differentiate this normal occurrence from real issues while servicing D Compressor Will Not Start If the compressor does not start find the root of the problem by conducting a step by step checkup There...

Page 25: ...he relay cover to check its contacts If they are open this means the original setting was not properly positioned or the temperature sensing agent has leaked Adjust the contacts of the temperature sensor towards the low temperature direction Once completed check if contacts have been closed If they are still open dismantle the temperature sensing disc and immerse it into warm water to see if the c...

Page 26: ...miness and cause the shaft to seize up Copper plating may also cause shaft seizure b Piston seizure This is caused when the fit clearance between the piston and cylinder is too small or has expanded due to heat These problems have most likely happened if the refrigerator is turned on but the compressor will not start while it emits a slight humming and seconds later the thermal protective relay ac...

Page 27: ...t the refrigerating capacity Due to a lower refrigerating capacity the refrigerator temperature cannot reach its rated value and the thermostat will malfunction so the compressor will continue to run When the evaporation temperature in the system is too high the temperature sensing agent in the temperature sensor will also be hot so the thermostat will be unable to cut off the power supply to the ...

Page 28: ... Next measure the resistancebetween the power cord and the casing with a voltmeter the reading should be zero ohms Ω At worst there is a blown fuse Check the three prong outlet to see if the live and neutral wires were inverted which will turn the power plug s ground prong into a live wire Another possibility is that the live wire and neutral line of the outdoor power supply circuit have been inve...

Page 29: ...ion becomes weak or disappears If the refrigerator has not been levelled put a leveler on the refrigerators top and adjust the leveling screws If noise is coming from the compressor hit different spots on the side of the casing with a regular or rubber hammer with a wooden block in between to determine if the suspended springs are out of balance or have been caught in something 29 ...

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