SiE-05C
Outdoor Unit Refrigerant System Diagrams
Functions PLUS Series
203
A. Solenoid valve (for shutting system 2 gas pipe) Y1S
2-way solenoid valve for shutting the gas pipe of the second system when system 2 outdoor units are
stopped during heating.
(Features)
External pressure equalizing (maintains pressure difference outside the valve in order to drive the valve) 2-
way solenoid valve that closes when energized and opens when not receiving power (opposite of
conventional solenoid valve). Construction is similar to 4-way valve, and similarly does not operate unless
there is differential pressure (3.5 kg/cm
²
)
B. Solenoid valve (for shutting system 3 gas pipe) Y2S
2-way solenoid valve for shutting the gas pipe of the third system when system 3 outdoor units are stopped
during heating. The valve itself is the same as solenoid valve A.
C. Solenoid valve (for shutting system 2 equalized pressure gas pipe) Y3S
2-way solenoid valve for shutting the equalized pressure gas pipe of the second system when system 2
outdoor units are stopped during cooling.
(Features)
External pressure equalizing (maintains pressure difference outside the valve in order to drive the valve) 2-
way solenoid valve that opens when energized and closes when not receiving power. Construction is
similar to 4-way valve, and similarly does not operate unless there is differential pressure (3.5 kg/cm
²
).
D. Solenoid valve (for shutting system 3 equalized pressure gas pipe) Y4S
2-way solenoid valve for shutting the equalized pressure gas pipe of the third system when system 3
outdoor units are stopped during cooling. The valve itself is the same as solenoid valve C.
E. Solenoid valve (for system 1 bypass) Y5S
Solenoid valve primarily for supplying system 2 and 3 outdoor units with excess oil from system 1 outdoor
units during cooling oil equalizing operation. (Pressure equalized pipes are closed at this time.)
F. Solenoid valve (for system 2 bypass) Y6S
Solenoid valve primarily for supplying system 1 outdoor units with excess oil from system 2 outdoor units
during cooling oil equalizing operation.
G. Solenoid valve (for system 3 bypass) Y7S
Solenoid valve primarily for supplying system 1 outdoor units with excess oil from system 3 outdoor units
during cooling oil equalizing operation.
H. Solenoid valve (for hot gas equlizing) Y8S
Solenoid primarily for equalizing pressure of refrigerant in liquid pipes when the compressor is stopped, but
is also used for high and low pressure protection.
I. Check valve bridge circuit
Constant high pressure or constant low pressure are created by the check valve in order to provide
solenoid valve A with differential pressure.
SI-05C.BOOK Page 203 Monday, November 6, 2000 4:13 PM
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