manualshive.com logo in svg

Premium PFR21500M, Service Manual

Share
Download
Premium PFR21500M Service Manual Download Page 8

 
 
 
 
 
 
 
 
 
 
 

                                   

 

Circuit Diagram   

Circuit Diagram   

1

 Schematic Circuit Diagram   

See the rating label on the Freezer.

 

Brief Description of Control Principle   

It is a direct cooling single-system Freezer   

with a small ice box. a mechanical type of all the control is   

generally adopted. The thermostat directly controls the start   

and stop of compressor, and hence the Freezer temperature. 

 

9 

Summary of Contents for PFR21500M

Page 1: ...0 MODEL PFR21500M ...

Page 2: ...215M 2 1 Color White Power Supply V Hz 115 60 Rated Input Power W 86 Power Consumption kW h 24h 0 52 Net Weight kg 27 Gross Weight kg Unit Dimension D W H mm Packing Dimension D W H mm Container Quantity 40 HQ PCS 29 499 537 858 530 580 890 264 3 ...

Page 3: ...Safety precautions Safety precautions 4 ...

Page 4: ...Safety precautions 5 ...

Page 5: ...Safety precautions 6 ...

Page 6: ...Function Schedule Function Schedule Energy efficiency Micro foam technology Low noise operation Thick insulation for energy efficiency 7 ...

Page 7: ... Flow Chart 1 Schematic diagram of System Flow Chart 2 Brief Description of System Flow Chart It is a direct cooling single system Freezer When the Freezer is just powered on the refrigerant flows in the sequence 1 2 3 4 5 1 8 ...

Page 8: ...l on the Freezer Brief Description of Control Principle It is a direct cooling single system Freezer with a small ice box a mechanical type of all the control is generally adopted The thermostat directly controls the start and stop of compressor and hence the Freezer temperature 9 ...

Page 9: ...power NO Check and repair according to the section of the compessor doesn t work YES If compressor can run naturally and temperature raising of condenser is very low YES NO Refrigerant leak check and repair charge refrigerant again Block by ice or dirty things change filter and change refrigerant again When charging refrigerant we must notice to make refrigerant true 10 ...

Page 10: ...g capacity insufficient NO Check and repair according to the section of Cooling capacity is insuffcient YES 1 The thermostat was set at the coldest position 2 The ambient temperature is very high or the Freezer is near by heat resource 3 The door was opened too many times or there are more fresh food inside NO Adjust and instruct consumer how to use NO Check and repair the main control panel 11 ...

Page 11: ...ting 3 Cooling capacity is insufficient Cooling capacity is insufficient Is the ambient YES temperature low than 16 C Check the therostat is correct YES NO Does the refrigerant leak siowly Adjust and instruct consumer how to use Repair 12 ...

Page 12: ...the power source and power cord NO Repair YES YES Is the ambient temperature low than 16 YES Check the therostat is correct Adjust and instruct consumer how to use Does the control panel has 220V power output NO Check and repair the control panel YES Does the compressor has 220V power output NO Check all cords and power cords YES Check and repair compressor and accessory 13 ...

Page 13: ...essure difference is still greater after the compressor has just stopped running the refrigerant will flow for a certain time therefore this sound is a normal phenomenon 2 A click sound can often be heard from the Freezer This is a normal sound produced by the pull in or release of the armature of a current deadweight start relay when starting the compressor The compressor motor will produce a sli...

Page 14: ...cations and natures of troubles should be determined according to their respective features therefore experience in servicing is very important to troubleshooting Service technicians with rich experience can correctly locate them and take reasonable remedy measures based on their comprehensive analysis of trouble characteristics as well as operating conditions for various kinds of Freezers Three E...

Page 15: ...by a sound similar to water flowing this is the sound produced by the normal circulation of refrigerant within the evaporator In case only the gas flowing sound can be heard and there is no water flowing sound this indicates that the refrigerant has already percolated If neither the flowing sound nor the gas sounds from the evaporator can be heard this means that the filter or capillary has been c...

Page 16: ...usly due to a certain trouble With this method you can reject some suspicious troubles and finally make a correct judgment 7 Analysis of Troubles and Troubleshooting A Poor Refrigerating Effect The so called poor refrigerating effect refers to the fact that the Freezer can operate and Freezer normally but the temperature in the Freezer cannot drop to the prescribed value under the stipulated worki...

Page 17: ... refrigerant has been charged the liquid refrigerant that cannot evaporates in the evaporator will return to the compressor and thus a phenomenon of liquid striking will occur The liquid refrigerant evaporates and effervesces as soon as it flows into the refrigerating oil at the bottom of compressor If the condition is severe foams will fill all over inside the compressor housing and be sucked by ...

Page 18: ...evaporator regularly if you fail to do so the frost layer on the evaporator tubing will become thicker and thicker Heat conduction will be severely affected when the whole tubing is wrapped with a transparent ice layer and finally the temperature in the Freezer cannot drop down to the prescribed range Remedy Turn the Freezer off and make preparations for defrosting open the Freezer door to let the...

Page 19: ... refrigerant and seal the charging port B No Refrigerating The phenomenon that the compressor runs normally but no frost or only a little frost appears on the evaporator and the Freezer temperature does not drop down is called no refrigerating There are many causes for this trouble and it is relatively complicated too In servicing special attention to finding direct causes for this phenomenon Thre...

Page 20: ...these phenomena will appear intermittently sometimes the Freezer works well and sometimes not well In order to determine whether it is clogged with ice heat the suspicious points with hot water to make ice melt and after a while if a gas flowing sound resulting from an abrupt gush is heard and the gas suction pressure rises as well it can be confirmed that the trouble is caused by ice clogging Rem...

Page 21: ...ging with dirt 3 Troubles of Compressor a Breakage of gas suction and discharge valve blocks Analysis of Trouble The compressor works by means of the opening and closing of gas suction valve and discharge valve to suck and discharge the refrigerant If the valve block is broken the refrigerant can not be discharged and hence no refrigerating can be achieved Method for making judgement It is quite d...

Page 22: ...the system Analysis of Trouble The residual air in the system will circulate together with the refrigerant in the system The major symptoms caused by this residual air is higher gas discharge pressure higher discharged gas temperature the gas discharge tubing is considerably hot when you feel it with your hand and poorer refrigerating effect Furthermore the gas discharge pressure will exceed its n...

Page 23: ...wer supply c Abnormal thermal protection Analysis of Trouble The compressor current is within its normal range but the thermal protector actuates repeatedly Remedy Replace the thermal protector with a new one 3 Sudden stoppage due to other causes Normal Stoppage Start and stop of the compressor is generally controlled by a thermostat When the temperature in the Freezer reaches its desired value th...

Page 24: ...the user for buying a stabilizer so as to step up the voltage thus normal operation can be achieved 3 Check the thermal relay to see whether its contacts are closed Analysis of Trouble The contacts of thermal relay sometimes may be open due to the leakage of temperature sensing agent from the temperature sensor Remedy Remove the relay cover to check up its contacts if they are open this means that...

Page 25: ...menon is caused mostly by poor lubrication such ad insufficient quantity of lubricant clogging in the lubricant oil line or intermittent lubricant oil supply Dirt and other impurities in the lubricant oil will increase its viscosity and cause the shaft to be seized Copper plating may also result in seizing of shaft b Seizing of piston This is caused by too small fit clearance between the piston an...

Page 26: ...ated value the thermostat won t work thus the compressor runs continuously When the evaporation temperature in the system is too high the temperature sensing agent in the temperature sensor is also hotter therefore the thermostat is unable to cut off the power supply to the compressor and stop it Remedy If it has been found that the refrigerant in the system is insufficient in quantity recharge it...

Page 27: ...ensively measure the resistance between the power cord plug and the case body with an avometer the reading will be zero 0Ω in the worst case the fuse will be blown Check the 3 prong outlet to see whether the live wire and the null line are inversely connected this makes the ground protection lead out from the power cord plug being connected to the live wire Another possibility is that the live wir...

Page 28: ...ation becomes weake or vanishes If the Freezer has not been levelly placed put a level meter on its top table and adjust the leveling screws on its legs In case noise occurs from the compressor strike different locations on the side surface of its case using a rubber hammer or hand hammer with a wood block in between so as to determine whether the suspended springs are out of balance or being seiz...

Page 29: ...30 31 ...

Reviews:

No comments

Brands by name

Popular brands

Load more brands