FAQ
FREQUENTLY ASKED QUESTIONS
About Purchasing
Our compressors are all original and brand new of Daming factory , best price with good quality .
Please contact our sales department : sales@dm-compressor.com
T/T, L/C
Usually , 25~35 work days .
1 standard packing .
Semi-hermetic reciprocating compressor & screw compressor : standard wooden case for each .
Scroll compressor : Standard quantity for each Pallet .(9Pcs / Pallet , 16Pcs/Pallet)
We accept sample order . the price according to your requirement .
About the compressor usage
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Compressor trouble-shooting chart |
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Fault |
Reason |
Solution |
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Electrical problem |
Compressor can not be started | No power supply or low voltage | Check power supply |
| Poor contact with control system | Check electrical system and fix it | ||
| Motor was burnt | Phase defect | Check power supply | |
| overload | Find out the reason why overload then fix it | ||
| low voltage | Let Power companies deal with it if they provide poor electricity;Checking and fixing it if poor contact. | ||
| Power circuit problem | Short circuit | Check the power circuit | |
| Circuit break | Check the break and and repair | ||
| Wire diameter is not compliance with requirement | Replace the right wire | ||
| Automatic shutdown after starting | Internal motor protector work | Find out the reason and fix it | |
| The setting of control system is wrong | Adjust the setting | ||
| Control circuit board was burnt | Bad insulation | Replace board | |
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Mechanical failure |
Abnormal vibration or noise, cylinder overheat , motor locked | No crankcase heater, liquid or oil impact, discharge valve default | Replace the valve , and there must have acurved space for receiving oil, you cannot change the pipe diameter of liquid and muffler .If you need to turn on the machine after long time shut down , Turn on the heater 2~3hours in advance . Please press the switch few times , 2~3 seconds each time . |
| Flood start after long term shut down | |||
| Oil got dirty | Replace oil | ||
| Poor quality refrigerant | Replace good quality refrigerant | ||
| No oil return to crankcase | Refrigeration system or condensing unit have oil trapsNo oil bend | Adjust or re-install | |
| Crankcase loose oil too fast . | Flood start or liquid impact | Adjusting expansion valve . | |
| Crankcase oil overheat | High suction temperature or refrigerant leaked . | Adjusting liquid of expansion valve , refill refrigerant if it is not enough | |
| Oil pressure protector work frequently | Liquid return into crankcase | Adjusting expansion valve . | |
| Filter of oil line blocked | clean oil filter or replace it | ||
| Oil pump defaulted | Replace oil pump | ||
| Suction pressure is too low | Mismatched with evaporator, expansion valve and condensing unit | Please match with right | |
| Evaporator blocked by ice or frost | Defrost regularly. | ||
| Pipe or filter blocked | Check system pipes , clean or replace filter | ||
| Discharge pressure is too high | The heat-exchange area of condenser id not enough | Please match with right | |
| Water -cooling pump default or mismatched with cooling tower | Repair or replace the pump | ||
| Condenser is dirty | Clean condenser | ||
The refrigeration cycle - in short is "the process of moving heat from one place to another." Refrigeration system has four main components, should be selected or designed according to working conditions, cooling capacity etc.
Regular maintenance is very important for the refrigeration system. The most serious defect of cooling system is congenitally deficient (each part of system is improper , the installation is not standardized).
Refrigeration system trouble-shooting chart
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Fault |
Reason |
Solution |
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Compressor doesn't work |
Leak | Any connection , pipes, valves etc will be the leak | Check and fix it , then refill the refrigerant |
| leak | Some parts broken ,like Solenoid valve, filter, expansion valve... | Replace the broken one or fix it . | |
| Blocked | Filter blocked by ice or trash | Replace the filter | |
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The cooling capacity is reduced |
The Valves of discharge or suction are broken | Improper design , such as no curved space for receiving oil and filter | Add proper oil reservoir or filter according situation |
| Suction overheat is too high orliquid impact | Adjust expansion valve , or choose a right one | ||
| Suction filter was broken, metal impurities enter into compressor | Replace the suction filter | ||
| Condensing pressure is too high | Condenser ‘s surface was dirty , or airflow is bad . | Clean it and promote the working ambient. | |
| Water-cooling condenser was dirty ; The cooling pipe is not fit , or water pump volume is small ; cooling tower was dirty . | Replace the water pump and water pipe ,clean it regularly | ||
| Suction pressure is too low | Heat expansion valve doesn’t work | Replace it . | |
| Leakage or shortage of refrigerant | Checking the leak and refill the gas | ||
| Suction filter blocked | Clean it | ||
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System current getting bigger |
Valve broken | Replace it | |
| Lacked oil | Refill oil and find out the reason | ||
| Voltage not stable or Electrical wiring route have faults | Check then fix it | ||
| Oil pressure is too low | Lacked oil | refill the same oil | |
| oil is dirty , oil filter net is dirty | Replace oil and clean the net | ||
| Oil pump defaulted | Replace the oil pump | ||
| Compressor cannot be started | wrong wire matching , improper Electric control box model | Check the electric wire , replace right electric control box , | |
| Power is turn on even when the machine shut down long time , crankcase heater have been working too much . | Open the compressor to rebuild | ||