AUX air conditioner service manual
6. Tube bender
Tube bender is the tool used to change the configuration of the copper tube or process the copper tube
in a certain figure. The types of the tube bender are various and it is applicable in bending the copper
tube with the diameter less than 20mm. When bending the tube, insert the annealed copper tube into
the wheel groove of the tube bender, and lock the tube clamping hook tightly. Then rotate the handle
bar slowly until reaching the required angle. The structure of the tube bender is indicated in the Picture
6-7.
a：handle movement direction b： handle bar c：wheel
d：tub-clamping hook e：tube-bending angle indicator f: handle
Picture 6-7: structure of the tube bender picture
7. Gas welding apparatus
Since the copper tubes are largely applied in the refrigerating system of the air-conditioner, the gas
welding is in need for service use. The traditional gas welding apparatus uses the mixture gas of the
oxygen and acetylene, which can produce the high temperature blaze. The modern welding equipment
adopt the liquefied petroleum gas as the fuel and the oxygen boosting liquefied gas welding machine
as the apparatus for the tube-joint welding work of the refrigerating system. The gas welding
equipment mainly consists of the gas tank, the soft connecting pipe and the welding gun.
8. Digital clamp meter
Digital clamp meter is one of the widely applicable measurement apparatus in practice. It is the most
common tool in the inspection process to the electric malfunction of the refrigerating equipment. It can
measure the voltage of the AC or DC, the alternating current and resistance etc. Its practicality is as
indicated in the Picture 6-8.
⑴Measure the AC and DC voltage
Firstly, turn the on-off switch to category of the ACV (AC voltage) or DCV (DC voltage), and select a
measurement range which is bigger than the voltage to be measured. Then insert the red and black
meter pens into the jacks of the object electric-supplying socket. The consequent figure shows on the
reading panel is the value of the measured voltage. There is no fixed polarity to the AC voltage, so the
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