Freezer

What kind of freezer are you? No manual?

First of all, check the lubricating oil system and refrigerant capacity, whether the intake and exhaust valves are working properly, and whether the safety valves are sensitive. There should be no looseness in the connecting parts. Measure the exhaust temperature and pressure values ​​at each level to see if they meet the requirements of each technical condition. Whether the motor’s heating condition and current value comply with regulations

Where is it produced? Different factories are different.

For example, York's, when you first start to open, you need to slowly adjust the suction valve until it is fully open. When the suction pressure is close to the set point, you can put it into automatic operation.

1. Operating procedures for ammonia compressor refrigeration systems (1) Requirements for compressor workshop operators The requirements for operators are:: Have a comprehensive understanding of the ammonia compressor and each ancillary equipment in the refrigeration system, the role of each pipe and valve, the working principle and operation method, and achieve a proficient level of operation in a timely manner (2) Preparations before starting the machine 1. Before the entire refrigeration system stops rotating, when turning on the ammonia compressor, you must check the records to understand the reason for the shutdown. If necessary, a comprehensive inspection should be made on the suction and discharge main pipe and the relevant valves on the relevant ancillary equipment. They should be adjusted to close or open. 2. Check whether there are any planned rotating parts around the compressor. 3. Check the oil level of the crankcase. It should be kept above 1/2 of the glass hole. For compressors with double glass sight holes, the oil level should be kept above 1/2 of the upper glass sight hole and more than 2/3 of the lower glass sight hole. 4. Turn the coupling or V-belt for a few turns to see if it is loose. 5. Check whether there is pressure in the center starter. If there is a pressure filter, the pressure must be reduced before driving. 6. Check whether the switches and starters of the motor are in the stop or start position. 7. If all the water pumps stop, you must first turn on the water pump to supply water to the condenser and its compressor. (3) Compressor single-click compression operating procedures (applicable to 100, 125, and 170 series compressors) 8. First close the suction and discharge valves on the double-click compression upper pipeline, and then open the suction and discharge valves on the single-click compression pipeline. 9. Check whether the valves on the compressor are closed, and whether each pressure gauge valve is slightly open. 10. Check whether the capacity adjustment valve is placed in the starting position or on the 0 position.: Start the compressor 1. Open the water inlet valve to supply water to the compressor 2. Start the motor and open the high-pressure exhaust valve at the same time 3. After the motor reaches full speed, adjust the capacity regulating valve to the full load position 4. Slowly open the suction valve 5. Adjust the oil pressure to be 0.15~0.3Mpa higher than the suction pressure B: Stop the compressor 1. Close the suction valve 2. Cut off the power, stop the operation of the compressor, and put the motor handle in the starting position 3. The compressor flywheel will stop, close the discharge valve 4. Place the capacity adjustment valve in the starting position or 0 position 5. After parking for 10 minutes, close the water inlet valve (2) Double-click compressor operating procedures 1. First close the suction valve and discharge valve on the single-click compression pipeline, and then open the suction valve and discharge valve on the double-click compression pipeline 2. Check whether the indicator pressure gauge valves of the suction and discharge serpentine coils on the intercooler are open and whether the oil drain valve is closed. 3. Turn on the liquid supply of the float ball or the manual expansion valve of the intercooler.: Start the compressor, first turn on the high-pressure machine 1. Open the water inlet valve to supply water to the compressor 2. Place the capacity adjustment valve in the starting position or the 0 position 3. Start the motor and open the high-pressure exhaust valve at the same time 4. Gradually adjust the capacity adjustment valve to the full load position 5. Slowly open the suction valve 6. Adjust the oil pressure to an intermediate pressure of 0.15 to 0.3 Mpa compared to the suction pressure B: Open the low-pressure compressor later 1. Open the water inlet valve to supply water to the compressor 2. Place the capacity adjustment valve in the full load position 3. Start the motor and open the low-pressure flat exhaust valve 4. Slowly open the suction valve and pay attention to the intermediate pressure not exceeding 0.4 Mpa 5. Adjust the oil pressure to be 0.15~0.3 Mpa higher than the suction pressure C: Stop the compressor operation, first stop the low-pressure compressor 1. Close the intercooler liquid supply valve 2. Close the suction valve and place the capacity adjustment valve in the no-load position 3. Cut off the power supply 4. The compressor coupling will stop, close the discharge valve 5. Close the water inlet valve. In winter, the water in the machine must be drained to prevent freezing.: Stop the high-pressure compressor 1. Close the suction valve 2. Cut off the power supply 3. The compressor coupling will stop and close the discharge valve 4. Place the capacity regulator in the no-load position 5. Close the water inlet valve. Water must be drained in winter to prevent freezing (3) Compressor emergency shutdown and other operations 1. If special circumstances occur in the compressor, such as a large crowbar, etc., the power supply must be cut off immediately, and then the discharge valve spark suction valve 2. If the compressor makes abnormal noise during operation, if possible, first check the fault location and then stop for maintenance. If the situation is urgent, proceed according to Article 1. 3. When the pressure and temperature of the compressor are obviously abnormal during operation, the cause must be checked and dealt with promptly. 4. When the compressor is damp, the suction temperature drops sharply. According to the situation, close the suction valve and then open it slightly. At the same time, check whether the ammonia liquid separator is too high. Make timely adjustments and finally remove the suction valve gradually. 5. When the compressor is running, if you click compression to change to two-stage compression, you must stop the running compressor, adjust the relevant gamma of the two-stage, and operate according to the Aozan regulations. It must be strictly implemented and shall not violate (4) Condenser operation 1. Each intake valve on the condenser, liquid drop valve, pressure equalizing valve, anti-air valve, safety valve, closing valve, pressure gauge below the valve, the valve is opened after entering the factory 2. The condenser must ensure normal water supply. If the water distribution is uneven, it should be adjusted. If the water volume is insufficient, a water pump should be opened. 3. The condenser is a high-pressure part, so the flange cover pool of each relevant valve must be checked frequently for leaks. 4. The condenser must be kept clean. Water dirt and rust should be removed regularly, otherwise it will affect the heat dissipation effect. 5. Record the temperature of the solution once every hour (5) Compressor refueling operation 1. The oil supply of the compressor is very important. If the normal oil supply cannot be maintained, each component of the compressor will quickly generate high heat and cause an accident. Therefore, the operator must pay attention to the refueling work. 2. Most of the compressor oil multi-way valves in the series. Close one section of the rubber and insert it on the multi-way valve, and put the other end below the oil level of the oil barrel. 3. Turn the multi-way valve to the refueling position, turn the multi-way valve to the running position, and remove the rubber tube 4. When the oil level reaches the required position, turn the multi-way valve to the operating position and remove the rubber tube. 5. For compressors without multi-way valves, the suction valve should be closed when refueling. However, when refueling a high-pressure compressor, double-click the formula to refuel. You must first close the low-pressure compressor suction valve before refueling. If there is no dedicated oil pump, it is more convenient to refuel. (6) Oil draining operations for each auxiliary equipment 1. The oil draining performance of each auxiliary equipment is very important, otherwise the oil in the system will reduce the refrigeration effect, so the oil must be drained regularly and timely, especially the washed oil ammonia separator, which is cooled by washing, and the separated oil accumulates at the bottom of the barrel. If the oil is not drained in time, the oil will accumulate more and more, and the corresponding ammonia liquid will become less and less. If the oil is not drained, the oil will eventually replace the ammonia liquid. As a result, the ammonia liquid washing effect will be lost, and a large amount of oil will enter the system to reduce the refrigeration effect. Therefore, the oil draining effect must be paid attention to. 2. Open the pressure reducing valve of the oil collector commercial port, and then close it after reducing the pressure. 3. Open the oil drain valve on the oil collector. 4. When the oil level reaches 80% of the glass indicator or enters the ammonia liquid, quickly close the oil drain valve of the container. 5. Open the oil drain valve on the container. 6. After letting the oil evaporate for the ammonia liquid, close the pressure reducing valve and timely oil inlet valve. 7. Open the oil drain valve on the oil collector. After draining the oil, close the oil drain valve. 8. Containers refer to intermediate condensers, liquid ammonia storage tanks, oil ammonia separators, etc. (7) Air operation 1. When there is air in the system, air must be released to improve the refrigeration effect and reduce high pressure. 2. The return valve on the air release is often opened. 3. Open the mixed gas valve 2 to 3 turns, open the liquid supply expansion valve 1/6 turn, and control the frost on the return pipe to about 1 meter. 4. Open the anti-air valve a little, and see big bubbles in the water. 5. After about ten minutes, according to the situation, open the discharge valve slightly and close the expansion valve a little. The vertical air-preventer can be adjusted according to the glass indicator liquid level. 6. When stopping the air release, close the expansion valve, exhaust valve and air-proof valve (8) Ammonia pumping operation 1. If ammonia leaks occur in an accessory equipment in the refrigeration system, ammonia must be pumped out in time for maintenance. 2. If ammonia leaks from the evaporator, the operation method is as follows 3. First close the liquid supply valve and drain valve on the regulating station 4. Start the Jesus to pump out ammonia. 5. Stop the compressor when the suction pressure is close to vacuum. Check the rise in the pressure gauge of the regulating station and start maintenance. If the pressure rises, it means that the evaporated ammonia has not been exhausted. You must continue to pump out ammonia until the pressure no longer rises after the machine is stopped. 6. After the maintenance is completed, vacuuming must be carried out. (9) Ammonia adding operation 1. Ammonia barrels and bottles must be stored in a cool and dry place. Check the pressure gauge of the regulating station. Maintenance can only be carried out when there is no rise in the pressure gauge. If the pressure rises, it means that the ammonia has not been exhausted during evaporation. Ammonia must be pumped out until the pressure no longer rises after parking. 2. Ammonia barrels or bottles with ammonia liquid must be handled with care to prevent vibration to avoid danger. 3. Prepare ammonia adding tools and gas masks. 4. Operators must wear gloves. If the ammonia bottle must be weighed, records must be recorded. 5. Connect the ammonia barrel or bottle to the ammonia pipe. If the ammonia bottle is empty, it is best to lift it up and add ammonia. 6. Open or close the ammonia-related valves and the relevant valves on the ammonia adding station. 7. Then open the liquid outlet valve on the ammonia barrel or ammonia bottle. 8. After the ammonia liquid in the ammonia barrel or ammonia bottle is exhausted, first close the liquid outlet valve on the ammonia barrel or ammonia bottle, and then close the valve on the ammonia adding station. 9. If there is an ammonia bottle, the valve closing process must be recorded. 10. After adding ammonia, return the relevant valves to normal (10) Inspection and adjustment operations of the refrigeration system during operation 1. When the refrigeration system is in operation, refrigeration equipment such as compressors, motors, ammonia pumps, intercoolers, ammonia-liquid separators, liquid ammonia storage tanks, oil ammonia fractionators, condensers, and regulating stations should be constantly inspected and adjusted. Therefore, operators cannot be careless and must be strict with themselves to ensure the normal operation of the refrigeration equipment and achieve safe operation. 2. When the compressor is running, you should check whether the readings reflected by the pressure gauge, temperature meter and electric meter are normal, and record them once an hour. 3. Whether the sound from the bearings of the steel plate valve, the oil pump level and other components is normal. 4. Whether the temperature of the bearings of the cylinder tank seal, the level 1 and other components is normal. 5. If the oil level in the crankcase is lower than normal, refuel in time. 6. The discharge pressure of the compressor, the medium pressure should not exceed 0.4 Mpa, and the higher pressure should not exceed 1.5 Mpa. 7. The compressor discharge temperature should not exceed 150 degrees Celsius for single-click compression, and should not exceed 140 degrees Celsius for double-click compression. The ideal discharge temperature should not exceed 130 degrees Celsius, and the minimum should not be lower than 70 degrees Celsius. 8. The compressor suction temperature should be between 5 and 15 degrees Celsius higher than the evaporation temperature. 9. The normal suction temperature of compression should be around -0 degrees Celsius to -5 degrees Celsius. 10. The oil temperature of the crankcase should not exceed 55 degrees Celsius, and the ideal oil temperature should be below 45 degrees Celsius. 11. The liquid ammonia storage tank must not exceed 80% and be lower than 30%. 12. Check the liquid level of the intercooler, which must not exceed 50%. If the liquid level is higher than normal or lower than normal, the float may have failed or the filter net may be clogged. 13. Check whether the bearings of each motor and its temperature are normal. The normal temperature of the motor should not exceed 35 degrees Celsius at room temperature. 14. Check whether the water supply of each water pump is stable and whether the components are normal. 15. Check whether the condenser boils water unevenly, and it should be adjusted. 16. The evaporation temperature of ammonia should be 4 to 5 degrees Celsius lower than the temperature of brine. The concentration of brine must be checked every shift, and salt should be added in time if it is not enough. 13.1. Before running the empty car test run, all other parts except the crankshaft of the compressor must be disassembled and cleaned. After adjustment and installation, add oil in the crankcase and remove the crankcase to prevent leakage. The front cover of the crankcase must be removed. The main problem is that the valve seat and its cylinder head are not installed during the empty test run to facilitate checking the bearing temperature. The cylinder head is placed on the body with a special block to prevent the cylinder from being ejected during operation. There are also three machines used in the machine itself. The screws tighten the cylinder liner on the body, so there is no need to use square wooden blocks to tighten it. When running without a car, check the oil supply from the oil pump to each component of the compressor, the working temperature and sound of its friction components, and improve the sealing and sealing of each friction component. Before starting the machine, turn the coupling or V-belt for a few turns, add a small amount of refrigeration oil to every cylinder, and wrap a white cloth with the top of the cylinder to prevent dust from falling in. Start the machine before test-running, turn on the power, and cut off the power immediately. See Check whether the running direction is the same as the one shown on the front of the compressor. If it is the same, it can be officially operated. Otherwise, adjust the motor first and conduct a trial run with no power. The first time is 5 minutes, the second time is 15 minutes, the third time is 30 minutes, the fourth time is 1 hour, and the fifth time is 2 hours. The key to running without power lies in the first time. After the compressor rotates, first pay attention to the oil pressure. If there is no oil pressure, stop immediately. Find out the cause and start driving. If the oil pressure rises, it can be adjusted to about 0.3Mpa.: Empty car test run, precautions during operation 1. The pointer readings of the ammeter and oil pressure gauge are stable, and the oil pressure is adjusted to about 0.3Mpa. 2. The temperature of the cylinder workpiece such as the bearing shell, crankcase cover, and buzzer should preferably exceed 50 degrees Celsius. 3. Each operating friction part should be free of oil knocking and noise. 4. If any normal condition is found, stop the car immediately for repairs B.: Inspection after empty car test run and parking 1. Open the crankcase cover immediately after the first 5 minutes of parking and check the temperature of the connecting rod bearing. If the temperature is normal, if the temperature is a little hot, it should be removed and adjusted and repaired. Otherwise, the second operation cannot be carried out. 2. Check whether the cylinder wall has lint. 3. In the third test, check the connecting rod bearing temperature. If the temperature is below 50 degrees Celsius, it is considered to be hot. 4. The interval between the fourth and fifth times should be at least 3 hours. The purpose is to lower the oil temperature by 13.2 and allow the air test run. The air test run can be used to test the air of the compressor. The purpose is to allow each component to withstand a certain pressure and increase a certain temperature to make the exhaust and intake valves tighter. Observe the working performance of the compressor so that the friction surface of the compressor becomes smoother and lays a favorable foundation. The air operation should be carried out after the empty test run is qualified. OK, first change the oil in the crankcase and clean the filter screen. The oil level in the crankcase should be increased within the specified range. Tighten all the screws in the crankcase, install the discharge valve and its cylinder head, remove the ammonia filter cover, loosen the vacuum valve for a few turns, connect the hose to the outside, open the water inlet valve to supply water to the compressor, turn the compressor for a few turns, and then start the test run. The air test run should be carried out in stages, the first time is 30 minutes, the second time is 60 minutes, and the third time. 2 hours at a time, the best interval between operations is 2 to 3 hours. During operation, the temperature and sound of the outer wall of the cylinder jacket, the outer wall of each bearing, the sealer, etc. should be checked. The discharge pressure should be adjusted to 0.2 to 0.3Mpa. After the operation is stopped, the cylinder wall should be checked to see if it is roughened. 13.3. System sewage system sewage is best done with an air compressor, but an ammonia compressor without an air compressor is also acceptable. An ammonia compressor is used for sewage discharge and pressure test stone discharge. The system sewage should be discharged as many times as the exhaust gas is clean. After sewage discharge, the main valves should be cleaned to prepare for the next step of system pressure test. 13.4 System pressure test to find leaks. System pressure test is best done with an air compressor, but an ammonia compressor can also be used. The system pressure test is divided into two parts, the high pressure part and the low pressure part of the machine. The high pressure is 1.8Mpa and the low pressure is 1.2Mpa. To find leaks, apply concentrated soapy water to the welding pool, valve flanges, etc. The leak test time is 24 hours as a standard. The first 6 hours are allowed to reduce the pressure by 0.02Mpa, and the pressure will not be reduced for the next 18 hours. To be qualified, you must be careful and patient in the leak search work. If the leak search is thorough, it will cause more trouble in the future. After adding ammonia, you will find out where the oil is leaking ammonia. Increased work difficulty 13.5. Find leaks in vacuum and add a small amount of ammonia. After passing the pressure test of vacuum and adding a small amount of ammonia, close all the valves in the system except the oil valve, open all other valves, open the vacuum valve of the compressor, start the compressor and open the suction valve. When the system pressure gauge is close to 0.1Mpa, it can be stopped. compressor, then add 0.2Mpa ammonia into the system. At this time, a pressure will be generated in the system, which can generally reach 0.4Mpa within 24 hours. Use phenolphthalein paper to find leaks. The phenolphthalein at the leakage point will turn red. If any leakage is found, it should be dealt with to make it leak-free. 13.6. Adding a large amount of ammonia and operating at full load. Before adding a large amount of ammonia, the entire system should be The relevant valves of the refrigeration system are adjusted, closed or opened. After all preparations are done carefully, the compressor can be started to add a large amount of ammonia for cooling. If all the refrigeration is not ready to be used, and only a part of it is used, it is safer to add 70 to 80% of the total ammonia amount according to the emergency screw refrigeration compressor 1. Preparation before driving When driving for the first time, you must first check the working conditions of all parts of the machine and its electrical components. The inspection items are as follows: ① Monk power switch, move the hanging switch to the manual position ② Press the alarm test button, the alarm bell sounds, press the cancel button, the alarm is eliminated ③ Press the electric heating button, the heating light turns on, after confirming that the electric heating is working, press the heating stop button, the heating stop light turns on ④ Press the water pump start button to start the water pump and the water pump light is on. Press the water pump stop button and the water pump stops and the water pump light is off. Press the oil pump start button and the oil pump is on. The oil pressure is established at 0.5~0.6Mpa. The energy adjustment moves to the loading position. The energy adjustment indicator needle on the suction end rotates in the loading direction. The slide valve loading works normally. Then Moving the energy adjustment handle to the load-reducing position means that the gauge needle rotates in the direction of load-reduction, and then stops the load at the 0 position. The slide valve load-reduction works normally. During the load-increasing test, the oil pressure is too high. You can turn the coupling by pressing the compressor rotation steering wheel to drain the oil in the body into the oil collector. Check each automatic safety protection relay. The purpose of each protection is as follows:: Exhaust pressure high protection 1.6Mpa High fuel injection temperature protection 65 degrees Celsius Oil pressure is higher than exhaust pressure protection 0.15Mpa High front and rear pressure difference protection of essential oil filter 0.1Mpa 2. After first-time driving After checking the above light items, you can drive. The steps for first-time driving are as follows: ① Move the rotary switch to the manual position ② Open the compressor exhaust cut-off valve ③ Set the slide valve pointer to the 0 position, which is the 10% load position ④ Install an electric heating button on the Freon unit, the heating light is on, and after the oil temperature rises to 40 degrees Celsius, press the heating stop button ⑤ Press the water pump start button to supply water to the oil cooler ⑥ Press the oil pump button to start the oil pump, and at the same time C of the oil return solenoid valve will automatically open ⑦ After 5 seconds to 10 seconds, the difference between the oil pressure and the exhaust pressure can reach 0.4~0.6Mpa. Press the main engine start button to start the compressor. Turn on the solenoid valve A to automatically open ⑧ Observe the suction pressure gauge and gradually open the suction cut-off valve. The compressor enters the running state, and valve A automatically closes. Adjust the oil pressure regulating valve so that the oil pressure difference is 0.1~0.3Mpa ⑨ The operating pressure and temperature difference of the compressor is normal, and it can run for a period of time, and then it can be stopped. Check each moving part in order, and measure the temperature and pressure of the points. If there is any abnormality, you should stop and check. ⑩ The initial operation time should not be too long, about 30 minutes, and then you can stop. The sequence is to open the energy adjustment handle in the load-reducing position, make the valve return to 0, press the host stop button, stop the host, close the suction pipe, stop the oil pump, stop the water pump, and complete the first start-up process. 3. The normal start-up process is as follows: ① For the manual refrigeration unit, the startup process is the same as the first startup process ② For the automatic control refrigeration unit A. Check the exhaust stop valve, the valve should be open B. Press the button water pump, the oil pump automatically puts into operation, the oil return solenoid valve C automatically opens, the slide valve automatically returns to the 0 position, the main motor automatically starts, C valve automatically closes, and the side solenoid valve A automatically opens. When the main motor enters normal operation, A valve automatically closes C. When starting the main motor, you should slowly open the suction stop valve, otherwise excessive vacuum will increase the noise and vibration of the machine. D. Increase the load of the slide valve to 100% to enter normal operation. 4. The normal parking process is as follows: ① Select the switch to the manual position, and the parking process is the same as the first time driving ② Select the switch to the automatic position ③ Press the stop button, the main motor automatically stops, the bypass solenoid valve automatically opens, the oil pump and water pump automatically stop, the B valve automatically closes ④ Disconnect the power switch 5. Precautions during operation ① During operation, the main observation is the suction pressure, exhaust pressure, oil temperature, and record the oil pressure regularly ② If it automatically stops due to some safety protection during operation, the cause of the fault must be identified before driving. Never change the adjustment method at will. ③ When the main engine is stopped due to a sudden power outage, the bypass solenoid valve cannot be opened, and the compressor may reverse due to the difference in exhaust and suction pressures. At this time, the suction valve should be closed quickly, so that the pressure on the exhaust and suction ends of the compressor can be balanced in a short time, reducing the reversal ④ If the unit is parked for a long time in seasons with low temperatures, the oil cooler lamp in the system should be drained of the water stored in the cooling equipment. ⑤ If the engine is driven in seasons with low temperatures, the oil pump should be turned on now and the steering wheel is turned to move the coupling to circulate the oil in the system so that the lubricating oil temperature is guaranteed to be 25 degrees Celsius. ⑥ When the unit is parked for a long time, the oil pump should be started every 10 days or so to ensure that all parts of the machine can be lubricated. The oil pump should be started for 10 minutes. 7. After long-term parking, you should turn the compressor several times when driving to check that there is no jamming of the compressor, and use lubricating oil to evenly distribute it to all parts. 8. During period of parking, start it every 2 to 3 months and run it for about 45 minutes.