AUX air conditioner service manual
separately to the joint entry of the gas tube and liquid tube of the outdoor unit of the split type
air-conditioner. The cut-off valve is a kind of close valve for pipeline. It controls the pass and stop of
the refrigerant flow by manual open-close control valve core. The cut-off valve can be divided into the
two-way cut-off valve and three-way cut-off valve according to the structure difference.
① Two-way cut-off valve
Two direction cut-off valve is used to be installed at the side of the liquid tube, which is belonging to
the tubing of the outdoor unit. The practicality is as picture2-12. The two direction cut-off valve
consists of the position regulator entry and two vertical cross pipelines. The configuration shown in
the picture 2-13 indicates: One of the pipelines connects with the liquid tube side of the outdoor unit,
the other one connects with the tubing of the indoor unit through the connecting tube of the indoor and
outdoor units. Inside the position regulator entry, there are valve rod and valve hole seat. A graphite
cotton rope (or oil-proof rubber) sealing ring is fixed at the middle position of the valve rod and
impacts the valve rod by the force of the fastening screw so as to prevent the gas leaking from the
valve rod. Before inspection or installation, screw off the copper enveloping cap, and screw off the
fastening screw of the valve rod by the inner hexagonal spanner. The attention herein is: If screw off
in clockwise direction, the valve rod moves down and the valve hole closes, otherwise, the valve hole
opens and the two vertical pipelines get through together.
② Three-way stop valve
In addition to all the above functions of two direction cut-off valve, the three direction cut-off valve
owns an extra service entry that provides the convenience for air-conditioner’s inspection and service.
The tree direction cut-off valve is installed on the gas tube’s joint entry of the outdoor unit. It’s in a
right-angle shape. Despite of two pipes’ joint entry and one valve rod position regulator entry, there is
an additional service entry. The practicality is as the picture 2-14.
The common three direction cut-off valve is equipped with a valve core, and composed with two
pipeline s’ joint entry, one regulating entry and one service entry. The four entries are straight as the
structure indicated in picture 2-15. The valve core inside the service entry is used for sealing the entry
and shall be covered by the dust-proof copper screw cap. When the valve rod moves down to the close
position, the tube breaks off from the pipeline of outdoor unit; On the contrary, when the valve rod is
screwed off upward to the open position, two connecting tubes get through together and the outdoor
unit get through with the indoor unit consequently. When fill in the refrigerant after service, press
down the valve core, and the service entry always keep through with the tubing without concerning
whether the valve rod is ON or OFF.
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