AUX air conditioner service manual
knob of valve in counterclockwise direction may enlarge the size of the valve bore, and the
corresponding tubing will get through with the gas path of the outdoor unit. The refrigerating system
always gets through with the pressure gauge on the three-way mend valve without concerning the
position of the knob. The conjunction with the knob of the three-way mend valve may carry out the
process of vacuumizing, refrigerant filling and pressure testing etc. to the refrigerating system.
1： Connect with the vacuum pump or refrigerant tank
2： Connect with the mend position
Picture6-3 pressure gauge and three-way repair valve
3. Expander
When two copper tubes need to be jointed together, the one shall be inserted into the other tube’s
mouth. In this case, the inner diameter of the latter’s terminal position shall be expanded enough so as
to inosculate the entry parts of the former one. Only by this way the two tubes can be welded in
fastness and without easy leakage. The function of the expander is tube expanding for the various
types copper tubes according to the specific requirement. When expanding the tube, insert the
annealed copper tube into the corresponding aperture of the pipe wrench, and the protrusion length of
the copper pipes out from the pipe wrench is different because of the different pipe size. The copper
tube in bigger pipe size need longer expander and the copper tube in smaller pipe size need shorter
expander. For example, to the copper tube with size of Ф8, the length of the expander shall be around
10mm. Then, screw down the nuts located on the two terminals of pipe wrench so as to clamp the
copper tube, and insert copper tube into the expander head. Rotate the screw of the expander slowly in
the clockwise direction until the expansion length in need achieved. The practicality of the expander is
as indicated in the Picture 6-4, and the structure is as the picture 6-5.
4. Flaring tool
Flaring tool is specially applied in the copper tube’s flare expansion work so as to connect the indoor
and outdoor unit of the split air-conditioner by the tubing. When flare is expanded, fix the annealed
copper tube by the connecting nut, and insert the copper tube into the corresponding aperture of the
pipe wrench. The protrusion height of the copper tube out from the pipe wrench shall be 1/5 of the
tube‘s diameter. Then, screw down the nuts located on the two terminals of pipe wrench, and press the
cone-shaped head of the flare tool to the flare. Rotate the screw slowly in the clockwise direction until
the expected flare formed. The practicality of the flaring tool is as indicated in the Picture 6-5.
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