Section
Air conditioner commonly used overhaul tools and the use of
1, the pressure gauge
Refrigerant leakage is a common fault of air conditioners, in order to detect the adequacy of the amount of refrigerant in the system, commonly used to pressure gauges, pressure gauges are Freon refrigeration system commonly used detection tools. Refrigeration system in the commonly used detection tools, its shell diameter from 60mm ~ 250mm, there are a variety of specifications, suitable for air-conditioner refrigeration system to use the vacuum pressure gauge range of -0.1MPa ~ 2.5MPa, as shown in Figure 2-33,
Pressure gauges are often used with the three-way repair valve supporting the clockwise rotation of the valve knob, the valve hole can be narrowed clockwise, clockwise rotation of the valve knob, can make the valve hole narrowed, clockwise rotation of the valve knob, can make the valve hole narrowed. Make the valve hole narrowing, clockwise rotating knob to the end, the corresponding piping and outdoor unit air cut off, counterclockwise rotating knob, the valve hole to expand, the corresponding piping and outdoor group of air conduction, refrigeration system and the three-way repair valve on the pressure gauge is always conduction, and the knob has nothing to do with the position of the switch, through the three-way repair valve switch with the refrigeration system can be realized by the vacuum, charging refrigerant and testing the pressure and so on.
2, expander
Two copper pipe butt, the need to insert a copper tube into another copper tube, it is often necessary to be inserted into the end of the copper tube of the inner diameter of the expansion, so that another copper tube can be inserted into the kiss, only then can make the two copper pipe welded firmly, and is not prone to leakage, the role of the expander is based on the need to expand the different specifications of the copper pipe. Expansion, the first annealed copper pipe into the corresponding aperture of the pipe clamp, the length of the copper pipe out of the clamp with the different diameters of the different pipe diameter, large diameter copper pipe, the expansion length should be a little larger, small diameter copper pipe, the expansion length is a little smaller, for Ф8 copper pipe, the general length of the expansion of 10mm or so, tighten the clamp clamp the ends of the nut, so that the copper pipe is firmly clamped, insert the required caliber of the expansion head!
3, flare mouth
Flare mouth is used for copper pipe flare mouth, in order to connect the indoor and outdoor units of the split air conditioner through the piping, flare mouth,
First annealed copper pipe set on the connecting nut, and then put the copper pipe into the corresponding aperture of the clamping pliers,
Copper pipe exposed to the clamping pliers for the height of the copper pipe diameter of one-fifth, tightening the clamping pliers Tighten the nuts at both ends of the clamp,
Press the conical head of the flare top presser on the pipe mouth, slowly rotate the screw clockwise, squeeze the pipe mouth into a flared mouth, as shown in Figure 2-35:
4, pipe cutter
In the repair and installation of air conditioning, it is often necessary to use the cutter to cut the pipe of different lengths and diameters of the copper pipe,
There are different specifications for the cutter, the structure of the cutter is shown in Figure 2-36:
Shown here is the structure of the cutter 2-36 shows:
Cutting the copper pipe, the copper pipe must be put between the two rollers of the cutter, rotate the knife knob clockwise,
The copper pipe will be stuck between the cutter and the rollers, and then rotate the knife knob while rotating around the copper pipe to rotate the cutter.
When rotating the knife knob, the force must be even and soft, otherwise the copper pipe may be squeezed and deformed, and the pipe will be cut off with a knife knob. /p>
After the copper pipe is cut off, the burrs on the edge of the pipe mouth should be removed with a reamer to prevent copper chips from entering the refrigeration system.
5, bender
Bender is used to change the shape of the copper pipe, copper pipe processing into the desired shape of the tool, the bender has a variety of sizes and specifications, suitable for bending radius of less than 20mm of copper pipe, bending, the first will be annealed copper pipe into the bender's wheel grooves,
clamping hooks lock tightly, and slowly rotate the handle until the desired angle. As shown in Figure 2-37:
6, gas welding equipment
Air conditioner refrigeration system using copper tubes, maintenance requires the use of gas welding, the traditional gas welding equipment using oxygen mixed with acetylene gas,
ignited to produce high-temperature flames, and now more use of liquefied petroleum gas (LPG),
Oxygen fueled liquefied petroleum gas (LPG) welding machine to carry out the refrigeration system piping weld The gas welding equipment mainly consists of 3 parts: gas cylinder, connecting hose and welding torch.
7, clamp meter
Clamp meter is a very widely used measuring instruments, is the most commonly used tools in the electrical troubleshooting of refrigeration equipment,
It can measure the AC or DC voltage, AC current, resistance and so on, in kind, as shown in Figure 2-38:
①, measurement of AC and DC voltage
First, the conversion switch will be switched to the AC voltage (ACV) or DC voltage (DCV), and select a range greater than the measured voltage, and then the red and black pens were inserted into the measured power socket jack, the panel shows the number of the measured voltage value,
AC voltage does not have a fixed polarity, so the clamp meter pens can not be divided into positive and negative poles to use. Measurement of DC voltage, the conversion switch should be rotated to DC voltage (DCV), and pay attention to select the range greater than the measured voltage,
Also find out the polarity of the measured voltage, measurement, the red pen to the positive voltage, the black pen to the negative voltage,
If the polarity of the pen is connected to the wrong, the clamp meter may be damaged.
②, the measurement of AC current
Turn the conversion switch to AC current (ACA) on the appropriate range, the measurement as long as the measured wire clamped in its clamp mouth,
Use of the principle of electromagnetic induction, the display can indicate the current strength in the wire.
③, the measurement of resistance
Rotate the conversion switch to the appropriate range, before measurement, the two pens directly connected (short),
Then the display should read 0 Ω and chirp, if the display does not show the number of 0 Ω, indicating that the clamp meter is damaged or insufficient power,
Measurement, the pens will be connected to the two ends of the resistance to be measured, the screen shows the value of the measured resistance. The digital value is the measured resistance value.
Section II
Electrical control system maintenance cases
Case 1, SCR bad, indoor noise
Fault phenomenon: after the shutdown, the indoor fan slowly rotating, after the boot issued a deafening noise.
Reason analysis: According to user feedback and phenomenon analysis, the preliminary judgment for the indoor motor power supply failure, check the indoor fan power supply voltage,
Shutdown state of the motor on the 100V voltage, shutdown the indoor motor is still slow and continuous operation,
Indoor motor heat to make the plastic motor frame deformation of the heat, the plastic sealing of the position of the motor offset, which leads to the cross-flow wind blade to touch the chassis, the motor is not a good idea. Leaf to touch the chassis, making an unpleasant noise, and there is a burning smell. It was determined that the fan control SCR was damaged.
Solution: change the main control board.
Summary of experience: Split wall-mounted indoor fan speed is controlled by the SCR, when the power supply voltage is low or fluctuates greatly,
will cause single-phase breakdown of the SCR, the indoor fan is still the voltage, the motor will still be slow to rotate, due to the breakdown of the SCR for a single-phase, the motor power supply is not sinusoidal, the motor does not run smoothly, and the noise is large.
Case two, the indoor fan shutdown after the non-stop and not open the fan on the run
Fault phenomenon: after the shutdown, the indoor fan non-stop, not open the fan on the run.
Reason analysis: According to the user to reflect the phenomenon of failure, power that is found to be running indoor fan,
With the remote control after the power on and off, the indoor fan is still running, the preliminary judgment for the indoor motor power supply failure,
Check the indoor fan power supply voltage, the state of the power on or off state of the motor has a voltage of 158V output, so the power on the indoor motor on the run,
This determination is the indoor motor on the run,
The indoor motor is the indoor motor,
This is determined as fan control SCR damage.
Solution: replace the same type of controller after the test machine normal.
Summary of experience: split wall-mounted indoor fan speed is controlled by the SCR, when the power supply voltage is low or fluctuations,
will cause the SCR single-phase breakdown, shutdown or shutdown of the indoor fan is still voltage, indoor fan can not be turned off.
Case three, the remote control receiver is bad
Fault phenomenon: the remote control does not open
Cause analysis: check the remote control, with the remote control to the ordinary radio, press any key on the remote control,
Radio are reflected, that the remote control is normal, the fault is in the indoor machine main control board or remote control receiver. Open the cover of the indoor unit,
Check the 220-volt input power supply and 12-volt and 5-volt voltage are normal, manually start the air conditioning, air-conditioning can start running normally,
The main control board is no problem, the fault is in the remote control receiver components, after checking the cause is found in the controller to receive the return circuit of the ceramic chip capacitor (103Z/50v) insulation resistance is small, only a few k Ω, good quality ceramic capacitors should be more than 10000MΩ, leakage current is large and caused by the remote control does not receive.
Solution measures: 103 capacitors directly cut out or replace the display board, the air conditioner has been operating normally.
Summary of experience: the cause of not receiving the remote signal for many reasons, in addition to the above capacitance leakage, no parts of the virtual weld will also cause the non-reception,
Additionally, air conditioning use of the environment has a great impact on the remote reception, when the environment is high humidity, condensate condensation in the back of the remote display board weld point foot and foot condensation, the circuit board mildew, the insulation is degraded, there is a leakage of electricity between the weld point leads to remote control does not open or the remote control malfunction,
Solution measures: 103 capacitance directly cut or replace the display board has been operating normally. The remote control does not work,
Clean the circuit board, use a hair dryer to dry the treatment, in the back of the remote control display board welded a layer of glass adhesive, the remote control can be received normally. With the radio AM file can be detected whether the remote control transmit signals, such as manual power on the air conditioning operation is normal, you can rule out the main control board failure,
This can determine the problem in the receiver, the maintenance can not be a simple replacement of spare parts, especially in the short term repeated maintenance, should be carefully analyzed the cause of damage to the parts.
Case four, temperature sensor failure
Failure phenomenon: air conditioning heating effect is poor, the wind speed is always very low. Cause analysis: door-to-door inspection, open mechanism heat, wind speed is very low, the air outlet is very hot, convert the air conditioning mode,In the cooling and air supply mode wind speed can be high, low adjustment, high, low wind speed is obvious, proving that the fan motor is normal, suspected of indoor tube temperature sensor characteristics change.
Solution: Replace the indoor tube temperature sensor and try everything is normal.
Experience: air conditioning heating, due to anti-cold wind function, indoor temperature sensor indoor heat exchanger reaches 25 degrees Celsius or more when the fan to work in the breeze, the temperature reaches 38 degrees Celsius or more when the wind speed to set the work. The above failure first observed found that the wind speed is low,
and the wind temperature is high, so check whether the fan is normal, when the wind speed is determined to be normal, analyze the sensor may check the temperature is incorrect, resulting in the indoor fan can not be set wind speed operation, so the replacement of the sensor.
Temperature sensor failure in the air conditioning failure in a relatively large proportion, to accurately determine the first to understand its function, air conditioning control part **** with three temperature sensors:
1, room temperature sensor: the main detection of the indoor temperature, when the indoor temperature reaches the set requirements, control the operation of the internal and external machine, refrigeration, the external machine stops, the internal machine continues to run, the internal machine blowing heat heating after stopping. After stopping.
2, indoor tube temperature sensor: the main detection of indoor evaporator coil temperature, in the heating of cold air, anti-overheating protection, automatic temperature control. Just boot coil temperature such as not reached 25 degrees, the indoor fan does not run, to reach 25 degrees Celsius above 38 degrees Celsius below the fan to work in the breeze, the temperature reaches 38 degrees Celsius above the set wind speed; when the indoor coil temperature reaches 57 degrees Celsius for 10S, to stop the outdoor fan operation, when the temperature exceeds 62 degrees Celsius for 10S, the compressor also stops running,
Only when the temperature drops to 52 degrees Celsius for 10S, the compressor also stops running. p>Only when the temperature drops to 52 degrees Celsius, the outdoor unit will be put into operation, so when the coil resistance is larger than normal, the indoor unit may not be able to start or has been running at a low wind speed, when the coil resistance is small, the outdoor unit frequently stops the indoor unit to blow cool air. In refrigeration protection against freezing, when the indoor coil temperature is lower than -2 degrees Celsius for 2 minutes, the outdoor unit stops running, when the indoor tube temperature rises to 7 degrees Celsius or the compressor stops working for more than 6 minutes, the outdoor unit continues to run, therefore, when the coil resistance value is large, the outdoor unit may stop running, indoor air blowing the natural air, the refrigeration failure.
3, outdoor frost temperature sensor: the main detection of outdoor condenser coil temperature,
When the outdoor coil temperature is lower than -6 degrees Celsius for 2 minutes, the inner machine to frost state, when the outdoor coil sensor resistance value is large, the indoor machine can not work properly.
Case five, air conditioning does not cool, communication failure
Fault phenomenon: indoor machine "running" light flash (the rest of the lights out), inside and outside the machine does not work
Reason analysis: According to the user to reflect the situation, the boot work normally, there is no user to reflect the situation, but about 30 minutes later, the inside and outside the machine stops working, the control panel on the control panel to stop working, and the user can see the temperature of the outdoor coil temperature is lower than -6 degrees Celsius for 2 minutes. The machine stops working, the running light on the control panel blinks, press any key air conditioning does not respond, unplug the power to retry the machine, the machine can work normally, but after 30 minutes and the same fault, because the air conditioning refrigeration before the shutdown is normal, so the system will not have a problem,
Preliminarily, the outside world signal problems, from the company to provide the fault display code can also be determined to be a communication failure, measurement of the inside and outside of the machine signal connection line is normal, so the outside world is not a problem. Measurement of the internal and external signal connection line is normal, so the external signal interference problems.
Solution measures: 103 ceramic capacitors in parallel between the signal lines on the computer board, or replace the Huafa production of anti-interference C3Y computer board after the elimination of the problem.
Summary of experience: in the maintenance, to be good at observing the fault panel indication state,
According to the company's fault code to quickly find the cause of the problem. If the outdoor pipe temperature sensor failure or internal and external signal connection line broken, no digital display function "timing indicator" flash 1 time / second, if the digital display function will display E2 code, three-phase A series "temperature light" flash, the rest of the indicator lights are off.
Case six, external signal interference
Fault phenomenon: irregular automatic shutdown at work, and accompanied by a buzzer abnormal continuous call.
Reason analysis: check the remote control is normal, emergency normal, indicating that the power supply, the motherboard is normal, measuring the inner machine sensors are normal, according to the user said at the same time to buy the same type of air conditioning, a normal, the other has a fault, suspected that there is a source of interference,
found that there are faults in the machine room fitted with electronic rectifier energy-saving lamps, whenever the lights are turned off, the machine is normal. Turn on the lights, measure the signal input of the receiver head 2V AC, turn off the lights, the remote control does not operate when measuring the voltage is 0V machine normal.
Solution: We recommend that users replace the brand of electronic rectification of fluorescent lamps, the machine is normal.
Summary of experience: electronic rectifier fluorescent lamps generated by the frequency, waveform superimposed on the infrared waveform emitted by the remote control, causing the machine to receive abnormalities, resulting in a source of frequency interference, in the maintenance of such failures, should be carefully questioned about the use of the user as well as on-site observation of the machine to use the external environment. Air conditioning signal interference sources are divided into: poor power quality electromagnetic interference, frequency interference,
Infrared interference, this fault belongs to the former. In dealing with, can be in front of the remote control receiver head to add a transparent dark-colored filter baffle, or in the receiver board harness to add a magnetic ring, can also replace the changed controller.
Case 7, the power supply phase sequence protection
Fault phenomenon: boot "timing" light and "run" light flashes at the same time, the system shut down
Cause analysis: according to the fault code for the protection of the outdoor unit, forced to run the compressor, can work normally, check the pressure, the compressor can work normally. Compressor, can work normally, check the pressure switch is normal, the power supply is also normal, initially concluded that the phase sequence detection protection, change the phase sequence after the boot, the compressor suddenly reversed,
So it is confirmed that belongs to the phase sequence detection board failure.
Solution measures: replacement of the outdoor unit detection board after the air conditioning operation is normal.
Summary of experience: according to the fault code, one by one elimination, maintenance personnel to have some experience in the maintenance of circuit operating principles, detection of faults should follow between to complex, to avoid detours (according to the above, after adjusting the phase sequence, the compressor reversed on,
This time, you only need to adjust the compressor wiring, so that the compressor positive, the problem can be solved), the A series of three-phase power supply, the installation of the installer sometimes the phase wires, the installation of the compressor, the compressor is a good idea, but also a good idea. A series of three-phase power supply, in the installation of the installer sometimes the phase line and the zero line reversed also caused the compressor does not start, in the maintenance should pay special attention to.
Case eight, FS, DS control panel key failure
Failure phenomenon: control panel key failure, the remote control can be operated
Reason analysis: because the remote control operation can be received, it can be ruled out is the main computer board problems, the production of Changzhou Hongdu D1 ~ D12 diodes used for key scanning diodes used in Changzhou Hongdu low frequency diode IN4007, and the main program for the key to the scanning board, the main program for the key, the main program is the key, the main program is the key, the main program is the key, the main program is the key, the main program is the key to the key. The fault of the control panel and the motherboard mismatch mainly occurred in February 2004 before Changzhou Hongdu Electronics Co.
Solution: found that such a failure, you can use Changzhou Hongdu Electronics Co., Ltd. in February 2004 after the production of the control panel to replace or with other companies and my company matching the replacement of the control panel, but also the control panel on the D1 ~ D12 diode replacement for the IN4148 high-frequency tube.
Summary of experience: In addition to the existence of DS button failure, FS (Y) temperature adjustment button failure may also be out of order,
Display panel design to consider the key feel leave a small gap, plastic sub-factory plastic panel button deformation, and the panel gap is too small to cause the operation of the failure to encounter this kind of failure only need to replace the same type of control panel.
Case nine, the compressor low voltage does not start
Fault phenomenon: boot compressor outside the compressor does not start
Reason analysis: boot indoor machine works normally, the controller outside the compressor voltage output is normal, measure the compressor capacitance is normal,
So the compressor problem, measure the compressor windings, the resistance value of the normal, when the measurement of the user's voltage,
Found that the voltage is only 19.6%.
Found that the voltage is only 198V, but within the standard design criteria, should be the compressor (48D129) start performance is poor.
Solution measures: replace a 35UF compressor capacitor, and the compressor capacitor in parallel with an auxiliary starter,
Air-conditioning on normal, do not need to replace the compressor.
Case ten, compressor capacitance, fan capacitance
Fault phenomenon: cooling, compressor start, air switch tripped.
Reason analysis: the air conditioning refrigeration operation, the compressor started a trip, a separate test of the inner machine is running normal,
Therefore, to determine the failure in the outdoor unit. Open the housing of the outdoor unit to check the power line L, N line resistance at both ends of the ∞, to determine the two lines without a short circuit or a short circuit to ground, and then check the outdoor unit device by device, when checking the compressor capacitor, found that the capacitor breakdown short circuit.
Solution: Replace the compressor capacitor, try normal.
Summary of experience: air conditioning compressor start that tripped the case, first of all should check the power supply L and N line is short-circuited,
and then confirm that the indoor or outdoor problem, continue to check the internal and external components whether there is a short-circuit phenomenon.
Case XI, outside the fan capacitor bad
Failure phenomenon: frequent stops, poor
Cause analysis: the air conditioning installed more than a year, the use of a restaurant, 220 volts power supply, the user reflects the air-conditioning work for some time after a refrigeration for a while without refrigeration, can not work properly, door-to-door check the pressure of 5Kg, the current is 12.5A, suspect that the condenser is too dirty, clean the condenser. Condenser is too dirty, cleaning the condenser after the fault is not eliminated, observation of the outdoor unit found in the air conditioning work outside the fan motor speed is slow,
Working 30 minutes outside the fan stops, the compressor current rises shutdown, at this time to check the fan motor winding open circuit, the motor shell is very hot, to be cooled down to the motor after the measurement of the winding resistance is normal, judging the fan capacitance is bad. Measures: replace the fan and capacitor, try to work normally.
Summary of experience: according to the test can be concluded: due to fan capacitor failure caused by fan protection, fan stops after the system heat dissipation is poor, resulting in the press overcurrent stopping the press, three minutes after the press to start again, so repeatedly, resulting in frequent start and stop, the fault can be seen, some of the reasons for failure is multi-faceted, is the electronic control and the system interact with each other to produce, therefore, in the maintenance of the maintenance should be carefully and carefully! Therefore, the maintenance should be carefully tested and observed to avoid detours.
Case XII, bad transformer
Fault phenomenon: no reflection on
Reason analysis: According to fault analysis, first check the power supply, 220V input, exclude the power supply problem,
Measurement of the power supply plug L, N resistance to infinity, may be a burned out fuse or transformer burned out, open the panel of the indoor machine to check the motherboard inspection, good fuse, measurement of transformer, found the primary fuse is good.
Solution measures: replacement of the transformer, test machine normal, troubleshooting.
Summary of experience: in the maintenance of the whole machine on the unresponsive, should first start from the power supply circuit, so fast and accurate to find out where the fault is.
Case XIII, AC contactor
Fault phenomenon: not heating
Reason analysis: open the machine heat, external fan to turn, the compressor does not turn, the four-way valve suction, the four-way valve to measure the inner board relay output
measurement of the power supply of the AC contactor is normal, forced to press the AC contactor, compressor start, and then measure the coil of the AC contactor has been disconnected.
Resolution: Replace the AC contactor to try normal.
Summary of experience: not heating if the internal power supply is normal, outside the fan, four-way valve suction is normal, the compressor does not move,
Should be the first to check whether the contactor is suction, coil resistance is normal, and then check the compressor problem, the damage to the AC contactor is generally burned, loose contacts, dirty, burnt, and so on.
Case XIV, power line problems
Fault phenomenon: not refrigeration
Reason analysis: power on, the inner machine works normally, observe the outer machine, the press startup issued a "buzz" sound, can not be started normally, the measurement of the voltage from 230 volts to 138 volts, the press is protected, the determination of the power supply problem, check the user power outlet, and then check the compressor. Problems, check the user's power outlet, found that the decorator will be grounded as a zero line use, after processing the test machine is normal.
Solution: ground and zero line to the right
Summary of experience: the installation must be used to connect the zero line with the N-terminal, can not be replaced with a ground line, ground and zero line reversed, may also cause the air switch tripped, the new installation of this problem should focus on checking the power supply, sometimes the power line is too thin wow seize cake ken watergate old leather taming Palace foam, air conditioning start-up current,
In the wire Produce a large voltage drop can also cause difficulties in starting. In addition to the power line problem, the size of the air switch often also cause start-up tripping.
Section III of the air conditioning refrigeration system repair cases
Refrigeration system failure is our maintenance in the wind of failure, failure phenomenon is also a variety of strange, but there are laws to follow, there is experience to learn from. Here is the air conditioning refrigeration system failure checking steps, although not necessary, but the maintenance should be along this line of thought for overhaul.
Air conditioning repair of common failures
Section I
Air conditioner commonly used tools and use of overhaul
1, pressure gauge
Refrigerant leakage is a common failure of air conditioners, in order to detect the adequacy of the amount of refrigerant in the system, commonly used to pressure gauge, the pressure gauge is a Freon refrigeration system commonly used in the detection tool, the diameter of its shell from 60mm to 250mm, there are a variety of housing. 60mm ~ 250mm, there are a variety of specifications, suitable for air conditioner refrigeration system using the vacuum pressure gauge range of -0.1MPa ~ 2.5MPa, as shown in Figure 2-33,
Pressure gauges are often used in conjunction with the three-way repair valve, rotate the three-way valve knob clockwise repair valve can be narrowed to make the valve hole, rotate the knob to the end of the clockwise rotating the corresponding piping and outdoor unit gas line cut off, the corresponding piping and the outdoor unit gas line cut off. And outdoor unit air cut off, counterclockwise rotation of the knob, the valve hole to expand, the corresponding piping and outdoor group air conduction, refrigeration system and three-way repair valve on the pressure gauge is always conduction, and the position of the knob has nothing to do with the switch with the three-way repair valve can be realized by the switch with the refrigeration system vacuum, refrigerant charging and testing pressure.
2, expander
Two copper pipe butt, the need to insert a copper tube into another copper tube, it is often necessary to be inserted into the end of the copper tube of the inner diameter of the expansion, so that another copper tube can be inserted into the kiss, only then can make the two copper pipe welded firmly, and is not prone to leakage, the role of the expander is based on the need to expand the different specifications of the copper pipe. Expansion, the first annealed copper pipe into the corresponding aperture of the pipe clamp, the length of the copper pipe out of the clamp with the different diameters of the different pipe diameter, large diameter copper pipe, the expansion length should be a little larger, small diameter copper pipe, the expansion length is a little smaller, for Ф8 copper pipe, the general length of the expansion of 10mm or so, tighten the clamp clamp the ends of the nut, so that the copper pipe is firmly clamped, insert the required caliber of the expansion head!
3, flare mouth device
Flare mouth device for copper pipe flare mouth, in order to connect the indoor and outdoor units of split-type air conditioner through the piping, flare mouth, the first annealed copper pipe set on the connecting nut, and then put the copper pipe into the corresponding aperture clamp clamp clamping pliers, the height of the copper pipe exposed to the height of the clamp for the copper pipe diameter of one-fifth, tighten the clamping pliers at both ends of the nut, the top of the mouth with the flare pressure tapered head pressure on the mouth, smooth and smooth, and the top of the mouth, and the top of the mouth, and the top of the pipe, and then the top of the mouth. Tighten the nuts at both ends of the clamping pliers, press the conical head of the flaring top presser on the pipe opening, and slowly rotate the screw clockwise to squeeze the pipe opening into a flare, as shown in Figure 2-35:
4, pipe cutter
When repairing and installing air conditioners, it is often necessary to use a pipe cutter to cut different lengths and diameters of the copper pipe,
The pipe cutter comes in different specifications, and the structure is shown in Figure 2-36:
When cutting the copper pipe, the copper pipe should be put into the two sides of the cutter, which are located at the bottom of the pipe. Copper pipe to the cutter between the two rollers, clockwise rotation of the knife knob, the copper pipe stuck between the cutter and the rollers, and then rotate the knife knob, while rotating around the copper pipe to rotate the cutter knife, rotating the knife knob, the force must be even and soft,
Otherwise it may be deformed by the extrusion of the copper pipe, copper pipe cut off, but also to use a reamer to the edge of the mouth of the burrs to remove, in order to prevent the copper debris from entering the refrigeration system.
5, bender
Bender is used to change the shape of the copper pipe, copper pipe processing into the desired shape of the tool, the bender has a variety of sizes and specifications, suitable for bending radius of less than 20mm of copper pipe, bending, the first will be annealed copper pipe into the bender's wheel grooves
The clamping hooks locking, and slowly rotate the handle until the desired angle. As shown in Figure 2-37:
6, gas welding equipment
Air conditioner refrigeration system using copper tubes, maintenance requires the use of gas welding, the traditional gas welding equipment using oxygen mixed with acetylene gas, ignited to produce high-temperature flames, and now more use of liquefied petroleum gas (LPG),
Oxygen fueled liquefied petroleum gas (LPG) welding machine for the refrigeration system pipeline welding, gas welding equipment, mainly by the gas cylinder, connecting hose and the gas welding equipment. By the gas cylinder, connecting hose and welding torch 3 parts.
7, clamp meter
Clamp meter is a very widely used measuring instruments, is the most commonly used tools in the electrical troubleshooting of refrigeration equipment, it can measure the AC or DC voltage, AC current, resistance, etc., in-kind, as shown in Figure 2-38:
①, measurement of AC and DC voltages
First, the transfer switch to the alternating current (ACV) or DC voltage (DCV). ACV) or DC voltage (DCV), and select a range greater than the measured voltage, and then the red and black pens were inserted into the measured power socket jack, the panel shows the number of the measured voltage value,
AC voltage does not have a fixed polarity, so the clamp meter pens can not be divided into positive and negative poles to use. Measurement of DC voltage, the conversion switch should be rotated to DC voltage (DCV), and pay attention to select a range greater than the measured voltage, but also to find out the polarity of the measured voltage, measurement, the red pen connected to the positive voltage, the black pen connected to the negative voltage, if the polarity of the pen is connected to the wrong
clamp meter may be damaged.
②, the measurement of AC current
Turn the conversion switch to AC current (ACA) on the appropriate range, the measurement as long as the measured wire clamped in its clamp mouth,
Using the principle of electromagnetic induction, the display will be able to indicate the strength of the current in the wire.
③, measurement of resistance
The conversion switch rotated to the appropriate range, before measurement, the two pens directly connected (short), then the display should read 0 Ω and chirp, if the display does not show the number of 0 Ω, indicating that the clamp meter is damaged or insufficient power, measurement,
will be connected to the two ends of the measured resistance, the screen displays the number of the measured resistance value. The value of the resistance will be displayed on the screen.
Reply:
Good.
If the electricity and freon are normal, I hope my answer can help you, then it may be a problem with the control of the electrical components? Are the capacitors normal. Now the season to use refrigeration, the air conditioner in the cooling state can not start, the air conditioner will certainly cool, I guess can not be used, the main thing is to see if the compressor has started?
If the external machine can work properly!
If the ambient temperature is lower than the temperature you set
Response:
1, the air conditioning does not cool one of the reasons: Freon is not enough (commonly known as insufficient snow) solution: replenishment of Freon that can be to solve the problem of air conditioning does not cool. 2, the air conditioning does not cool the causes of the second:
Supply voltage is not enough solutions: to maintain a normal supply voltage. 3, the air conditioning does not cool the cause of the third: air conditioning power is not enough so that the cooling solution ...
Response:
In addition to the start capacitor is bad, there is a compressor shaft jamming cylinder, there may be a compressor power wiring burnt, the compressor thermal protection is bad (some compressors with thermal protection).
Generally bad capacitors, long time to find out, while the wiring will be burned, if not found to continue to boot time and then a little longer compressor will be bad.
If the capacitor is not bad, the compressor...
Response:
Car air conditioning compressor is driven by the belt, you can check whether the belt is too loose, cold start air conditioning does not cool is the engine speed is not yet normal, this should not be a big problem. The instantaneous fuel consumption of the car is 1.3 is the fuel consumption per hour when parked, and it should be more than that when driving. The lack of cooling at idle could be a problem with the control computer, best to go to a 4S...
Response:
1. The air conditioner is fine, the ambient temperature is low (room temperature 18 degrees), set the temperature to choose a lower point (16 degrees) or wait for the temperature to warm up and try again.
2. Indoor machine control circuit board or temperature probe failure, check out the problem point to replace the new parts can be.
Response:
Check if the compressor is running!
Response:
Nanjing Grantham Air Conditioning After-sales Service Center Tel: "4000 + 919 + 828" The following I air conditioning air conditioning is not refrigeration air conditioning common problems and solutions to explain: Section I
Air conditioning commonly used overhaul tools and the use of 1, the pressure gauge
Refrigerant leakage is a common failure of air conditioning, in order to detect whether or not sufficient refrigerant in the system, commonly used to the pressure gauge, the pressure gauge is used to detect whether or not enough to detect the system, and to detect whether or not sufficient to detect the system. Whether sufficient to detect, commonly used to pressure gauges,...
Reply:
Is it snowing in your area? The weather is humid when the heating outside the machine frost fast, you can adjust to the heating on the automation of the automation after the frost, after that it is good, you can also let it forced frost, that is, the air conditioning on the cooling on the cooling temperature to the lowest, with a hand holding the indoor unit ambient temperature sensor so that he forced cooling, frost, turn off the air conditioning and so on for three minutes and then adjusted to the heating...