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Creating a vacuum in the system
NOTE Each time the opening of the system is necessary to create a vacuum to prevent air and moisture. After installation of an element should be maintained in the vacuum for about 15 min. Opened repair system components must be under the influence of vacuum for 30 minutes. |
If the engine is not running, perform the following procedures.
Connect kit pressure gauge to control the compressor. Close the valves in the high and low pressure (Fig. 8.60). Make sure that the refrigerant drained from the system. Attach the center hose set of gauges to the inlet of the vacuum pump. Turn on the vacuum pump and open the valves of high and low pressure. After about 10 minutes, make sure that the low pressure gauge indicates vacuum below 94.39 kPa (0.96 kgf / cm 2). If the vacuum can not be obtained, this indicates a leakage system. In this case, eliminate leakage as described below. 1. Close both valves and pressure gauges set stop the vacuum pump. 2. Charge the system with refrigerant from the container (approximately 0.4 kg). 3. Determine the location of the leak using leak detector. 4. Again, drain the coolant and create a vacuum in the system. If leaks are found, continue to create a vacuum in the system. Turn on the vacuum pump. Open both valves sets of gauges until until created a vacuum 94.39 kPa (0.96 kgf / cm 2) (Fig. 8.61).
Once the low pressure gauge shows a vacuum of about 94.39 kPa (0.96 kgf / cm 2), continue to create a vacuum for 15 minutes. After 15 minutes of finding the system under the action of the vacuum valve close both sets of gauges and stop the vacuum pump. Disconnect the hose from the vacuum pump. The system is ready for charging refrigerant.
Actions with gate charging system
| Fig. 8.62. Driving under the influence of the installation with the gate charging system
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Before connecting the valve to the tank with refrigerant, turn the handle to its fully counterclockwise. Set the dial to its highest position by rotating counterclockwise. Attach the center hose to the nozzle valve. Turn the valve handle clockwise to punch a hole in a sealed top. Loosen the nuts of the central hose fitting to the central control gauges. Let the air for several seconds, then tighten the nut.
Charging of refrigerant vapor Install the tank valve of the refrigerant in the position shown above in the "Actions with charging valve system."
NOTE This operation is performed for charging the system with refrigerant in a vapor state through a low pressure circuit. When upright tank with refrigerant in the latter is fed in vapor form. |
Open the valve low-pressure circuit and adjust its position so that the pressure gauge on the low pressure does not exceed 412 kPa (4.2 kgf / cm 2). To the vapor pressure of the refrigerant in the tank is slightly higher than the pressure in the system, put in a container vessel of warm water (temperature of about 40 ?� C). Run the engine at idle and accelerated the air conditioner.
NOTE Capacity refrigerant keep upright, to prevent liquid refrigerant from entering into the system through the suction line, which may cause damage to the compressor. |
| Fig. 8.63. The position "closed" circuit low pressure
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Fill the required amount of refrigerant system, then close the valve low-pressure circuit (Fig. 8.63). Number of refrigerant charge: 500 ?� '25 At low speed the refrigerant charge tank with refrigerant immerse in warm water (temperature of about 40 ?� C).
ATTENTION No way to immerse in a container of heated water coolant temperature above 52 ?� C. It is forbidden to heat the container with a blowtorch or in a drying chamber. |
Charging the system with liquid refrigerant After vacuum purging system completely close valves, high and low pressure.
NOTE This operation is performed for charging the system with refrigerant discharged in the liquid state through the high pressure. When the container upside down position refrigerant fed into the system as a liquid. |
ATTENTION It is forbidden to charge the system through the high pressure with the engine running. When charging the liquid refrigerant of low pressure valve does not open. |
Install the tank valve of the refrigerant in the position shown above in the "Actions with charging valve system." Open the high pressure valve by placing a container of refrigerant in a position upside down. Charge the required amount of the refrigerant system, determining its mass by weighing. Excessive charge would exceed the discharge pressure (the high pressure circuit). After charging, close the valve of high pressure. Number of refrigerant charge: 500 ?� '25 After charging the required amount of refrigerant, close the valve control pressure gauges. With the leak detector check for leaks from the system.
NOTE Before removing the control pressure gauges is recommended to test it out. |
Leak test system In all cases, when it is expected the presence of refrigerant leakage or produced work related to removing the items or loosening connections, perform leak test system with an electronic leak detector. Check the torque tube connections. When loosening, tighten the connection to the specified torque. With the leak detector check for gas leaks. If, after tightening the connection leak persists, discharge system, disconnect the connection and check sealing surfaces for damage. Even minor damage to parts of the compounds must be replaced. Check the amount of refrigerant oil and, if necessary, restore it back to normal. Charge the system and check for leaks. If leaks are found, make a vacuum purging and charging system.
Check cooling system Install test gauges. Start the engine and run it at an engine speed 2000 min-1, set the temperature of the position corresponding to the salon supply maximum cooling air, and fan switch - the position corresponding to the maximum speed. Open all windows and doors.
| Fig. 8.64. Installation of dry thermometer into the nozzle supplying cooled air to the interior
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Place the thermometer in a dry nozzle flow of cooling air into the cabin (Fig. 8.64). Be the psychrometer in a place in the fence of air conditioner refrigerant circuit. Check the high pressure gauge, which should be between 1,373-1,575 psi (14-16 kgf / cm 2). If the reading exceeds the specified upper limit, pour water condenser. If the reading is below the lower limit, cover the front part of the condenser. Check the dry bulb temperature, which should be in the range 25-35 ?� C.
Determine the relative humidity on a psychrometric chart by comparing the temperature of wet and dry bulb psychrometer placed at the site of the combustion air in the air conditioner (Fig. 8.65).
NOTE After determining the temperature of wet and dry bulb temperature at the inlet of the evaporator, it is possible to determine the relative humidity of the air. Example: the temperature of the dry and wet bulb temperature at the inlet of the evaporator is respectively 25 ?� C and 19,5 ?� C. The intersection point of the respective dashed lines in the graph gives the value of relative humidity (60%). |
Determine the dry bulb temperature, placed in the nozzle supply of cooling air to the interior and calculate the difference between the values of dry bulb temperature at the air intake and outlet dry bulb temperature of air in the cabin.
Make sure that the point of intersection of the lines relative humidity and the temperature difference is within the area shaded in black, indicating the conformity of the COLD-performance norm (Fig. 8.66).
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