Precautions For Disconnecting And Connecting Air Conditioner Piping - Komatsu PC200-8M0 Shop Manual

100 Air conditioner

Precautions for disconnecting and connecting air conditioner piping

Precautions for disconnecting and connecting air conditioner piping
Precautions for disconnecting
k
Collect the refrigerant (Air conditioner gas:
R134a) from air conditioner circuit before
disconnecting air conditioner hose to re-
place air conditioner unit, condenser air con-
ditioner compressor or receiver drier and so
on.
a Ask a qualified person for collecting, adding and
filling operation of refrigerant (R134a).
a Never release the refrigerant (R134a) to the at-
mosphere.
k
If refrigerant gas (R134a) gets in your eyes,
you may lose your sight. And if it touches
your skin, you may suffer from frostbite. Put
on protective eyeglasses, gloves and work-
ing cloth with long sleeves while collecting
the refrigerant or filling the air conditioner
circuit with the refrigerant.
q When loosening the air conditioner hose nuts af-
ter collecting the refrigerant, be sure to use 2
wrenches. Use one wrench to fix and use the
other one to loosen the nuts.
q Cover the air conditioner piping connections not
to enter dust, water or moisture.
PC200, 200LC, 220, 220LC-8M0
Precautions for connecting
q Once an O-ring is used, it is deformed and dete-
riorated. Accordingly, do not reuse it. When re-
moving it, use a soft tool (such as a toothpick) so
that the piping will not be damaged.
q When connecting piping check that there is no
damage and deterioration.
Apply compressor oil (ND-OIL8) for R134a to its
q
O-rings. (See item 4 of "Handling compressor
oil")
a Do not apply oil to the threads of a bolt, nut or
union, however.
q Push in each pipe to the stopper and tighten the
bolt or nut fully with your fingers.
Be sure to use two wrenches to tighten each nut.
q
Use one wrench to fix and tighten the nut with
the other wrench to the specified torque (Use a
torque wrench for tightening).
a Example of O-ring installation
q There are O-rings at all the connections of the air
conditioner piping.
SEN06151-00
71
80-100