[What Causes High Oil Pressure On Copeland Semi Hermetic Compressor
Olegario Benford
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The appearance of refrigeration oil should be clear and transparent, even after a long run, it should be kept in this color. If the refrigeration equipment is properly installed and running normally, the lubricating oil can be used for a long time without replacement. Lubricating oil piping system is due to black dirt or too high exhaust temperature of compressor oil caused by decomposition. However, the system of dry degree and vacuum degree will also cause the lubricating oil to become black and decomposition. The lubricating oils that are black and decomposed must be replaced.
What Causes High Oil Pressure On Copeland Semi Hermetic Compressor
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If the dirt is particularly serious, it is recommended to open the compressor chassis, clean the crankcase and chassis. After washing must be started again before the vacuum compressor. If there is no need to remove the chassis, the oil can be discharged from the gas hole or back to the gas cooling compressor in the filter or crankcase heater. When the oil from the gas hole, first close the compressor suction valve, so that the crankcase table pressure drop to about 0.1bar, and close the exhaust valve. Carefully loosen gas bolt holes to reduce the residual pressure of the crankcase. A brass through the gas hole and inserted to the bottom of the crankcase, orifice with sealed center hole of the conical rubber plug or similar objects. The copper tube is best able to bend freely and have enough length to further the crankcase. Open the suction valve to crankcase gauge rose to about 0.30.4bar then close. Due to copper tube in the crankcase opening below the bottom of the crankcase, the lubricating oil will be through the copper tube continuous continuous outflow until crankcase oil is discharged.
Refrigerant pressure in the crankcase into surplus can perfectly prevent air and dirt. Open the suction stop valve 1 to 2 seconds after washing the crankcase blowing and then close and immediately tightened filling bolt hole, the compressor can be re fueling the. The lubricating oil is drained after being drained. As a result of the machine running after some of the refrigerant absorption of the lubricating oil is still left in the system, so again the amount of fuel is less than the initial amount of fuel.
If the dryer uses a built-in or independent humidity indicator, it is convenient to know when to replace the desiccant. There is no need to replace the desiccant in the installation of good equipment, but for the long-term use or the use of the equipment without a good dry, the situation may be different. So it is suggested that the humidity indicator can be checked every day at the beginning of the machine, and then the interval can be increased.
If the compressor must be open, even if the use of a variety of safety precautions, but also a certain amount of air or moisture into the system. At this point to replace the new dryer or desiccant. After each inspection equipment, should check the dryer, expansion valve and compressor filter or filter, when necessary, cleaning. If the dirt is too much, it shall be checked repeatedly.
If there is a leak in the equipment installation, use the torque wrench to re tighten the bolt. The torque wrench can prevent the bolt tight and skid. Allowable torque. If the new fastening bolt can not stop the leakage, the replacement of the cylinder head, the valve, the chassis, the compression box cover seal. However, if the replacement of the sealing pad can not completely vacuum the compressor, it is recommended not to replace the sealing pad. In the machine cover, cylinder head, valve plate and similar components of the installation, replacement or repair, in principle, must use a new sealing pad. In any case, the compressor must be evacuated before it starts.
The liquid refrigerant and the valve plate with the debris of the refrigerant will be damaged with suction exhaust reed and limiter. Valve plate group will therefore work disorders, damage or destruction. Damage or fail to work the valve plate will reduce the output power of the compressor, such as the destruction of the valve will cause the compressor to stop. Leakage of the working valve (vent) can be checked by the following method: (a) A suction pressure gauge is connected to the pressure gauge on the suction stop valve. Close the suction valve, cut off the air tube pathway. Start the compressor pressure gauge display -0.5bar vacuum pressure shutdown open the suction valve the gauge rose to 0bar, then shut down valve. If a minute pressure continues to rise, indicating that the valve does not close off. (b)Proposed replacement of the entire valve plate and not just the valve plate. (c) Note: suction valve leakage may also cause pressure rise. Refrigeration equipment with oil separator should be closed return line valve in the above test.
The replacement is not difficult to replace parts, but must be very careful.Note: operation of assembling and disassembling of the parts and motor usually in the workshop to ensure cleanliness necessary and correct process. Copeland is not allowed by the air drying do simple test run to determine the movement mechanism comprises a rotary mechanical parts such as whether to work correctly when. Exhaust valve in the closed or semi closed will produce a higher pressure, cylinder head temperature increased and the so-called "Diesel" effect, namely, inhalation of air drying and lubricating oil steam mixing and in cylinder head temperatures occur deflagration and damage to the compressor.
Once the oil pump can not work, it must be replaced.
The oil pump is fixed on the bearing cover of the compressor through 6 bolts, and the center of the oil pump is centered on the bearing sleeve or the bearing cover center. Oil pump cover is 3 or six angle bolt and the pump body is tightened, can not be removed, and the pump cover and pump body can not be installed between the sealing pad, otherwise the oil pump can not work. Built in relief valve is not free to adjust.
Oil pump can be reversed operation. After long running, the pump conversion mechanism may be wear, corrosion and dirt blockage, therefore cannot reverse operation. Don't pass the oil pump on the pump.
The phenomenon of burning is rare. However, if there is a high temperature and high pressure gas, residual corrosion, acid material and the decomposition of the lubricating oil, the results (unless the first damage of the valve or operating mechanism) will eventually lead to the damage of the motor.
The refrigeration equipment for the compressor caused by the damage of the motor can not be done only for a careless cleaning. Otherwise, the built-in motor replacement will be affected by the previous motor burned affected residues remain in the equipment in the burned again.
Such equipment shall be cleaned in accordance with the following steps:
1 close the compressor stop valve, the other parts of the device and the compressor separately.
2 remove some lubricating oil samples from the replacement compressor and fill it in the glass, so that it is clean.
3 to maintain the compressor and the system of isolation and the compressor pump vacuum, and then open the compressor valve, close the valve and other valve, so that the compressor discharge volume to a minimum, and then emptying system. Although this process will have some dirt entering the compressor, but within a short period of time not compressor damage, the dirt can be through a dry filter to be removed.
4 check all the control and switching devices, such as expansion valve, solenoid valve, safety valve, bypass valve, etc., if necessary, should be cleaned or replaced, remove or replace all the dry filter, the filter element or filter must be completely cleaned or replaced. Such as visual mirror failure, should be replaced. According to the output power of the device in the suction pipe to install the acid absorption and drying filter, and the installation of large capacity of acid absorption and drying filter on the liquid pipe.
5 the acid absorption and the large capacity of the liquid pipe of the suction pipe must be installed in a dry filter, both of which are determined according to the capacity of the device.
6. The compressor and the system is in the running state. From the residual dirt precipitates in the system will increase the drying filter pressure loss, so at least interval of 4 hours to check the drying filter force award to avoid measurement errors. To avoid this kind of error, it should be checked regularly. And it is necessary to change the pressure drop over a large dry filter.
7 hours after the system runs, check the smell and color of the oil. If possible, the determination of acidic side acid. If the lubricating oil has a sour taste or a liquid mirror shows a high moisture content, it should be replaced again by dry filter and lubricating oil. The system must repeat the above check again after 48 hours. So run and check repeatedly, until the lubricant is pure and tasteless, the color of the above second points in the original oil sample is similar.
8 the large capacity dry filter for liquid pipe is changed into normal size. Dry filter on the suction pipe should be removed. Re - assemble as if ready to continue to use.
9 to ensure the smooth operation of the future, in the cleaning work to complete and re run the equipment after two periods of a lubricating oil inspection.
The main causes of excessive heating of a compressor can be the following: a very high compression ratio (low suction pressure and high discharge pressure), a low refrigerant charge, an operation below the permitted capacity reduction limits.
The oil temperature is measured on the outer surface of the sump on the delivery side; the discharge temperature can be measured on the delivery line at about six times the diameter of the pipe itself from the compressor.
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