SANY LATIN AMERICA
4-144
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4. Evacuation
●
No moisture shall exit in the air condition-
ing unit. Refrigerant (R134a) is soluble in
water. Very small amount of moisture in
the unit can cause the ori
fi
ce of the expan-
sion valve to ice up, or cause the compres-
sor valve to rust. To avoid such problems,
moisture in the system shall be removed
before refrigerant is added. To minimize
the residual moisture in the system, mois-
ture in the system can evaporate through
evacuating.
Evacuating steps
Step 1: Connect the manifold pressure gauge
1) Close the high-pressure valve (HI) and
low-pressure valve (LO) of the manifold
pressure gauge.
2) Connect the hoses (red, blue) to the auxil-
iary valve of the compressor.
Red hose – High pressure side (Mark D)
Blue hose – Low pressure side (Mark S)
NOTE
: Connect the end of the hose with a
L to the auxiliary valve of the compressor.
If connected inversely, the valve will not
open. Besides, do not inversely connect
the high-pressure end and the low-
pressure end.
3) Connect the green hose to the vacuum
pump.
ZX215-1002155
LO
HI
LO
HI
D
S
Lo-pres. valve (ON)
Hi-pres. valve(ON)
Lo-pres.
gauge
Hi-pres. gauge
Vacuum pump (running)
Compressor
Valve
Lo-pres.gauge
above 750mmHg
ON ON
OFF OFF
Blue
Red
Green
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