– 82 –
<Other points to note>
1 Cooling operation under low outside temperature conditions
1) If pressure falls to extremely low levels, indoor units may be shut down via freeze prevention control based
on the indoor TC sensor.
2) If pressure falls to extremely low levels, frequency may be reduced via cooling capacity control.
3) When the discharge temperature sensor reading falls below 60°C, the frequency may be increased above
the level called for by the command received from the indoor unit.
2 PMV (Pulse Motor Valve)
1) When the power is turned on, PMVs generate a tapping sound as they are initialized. If this sound is not
heard, there is a possibility of faulty PMV operation. However, in a noisy environment, it may simply be
drowned out by ambient noise.
2) Do not separate the actuator (head section) from any PMV during operation. It may result in an inaccurate
opening.
3) When transporting (relocating) the set, do not, under any circumstances, keep the actuator separated. It
may damage the valve by causing it to close and exposing it to pressure from sealed liquid.
4) When reattaching the actuator after its removal, push it in firmly until a click sound is heard. Then, turn the
power off and back on again.
<Schematic diagram for oil equation control>
)*4021PAM-YMM( tinu rewolloF)*4061PAM-YMM( tinu redaeH
TL
PMV1
TD2
TS1
SV2
TE1
FM
SVD3
PMV2
TK2
SV3B
TK1
SV3A
HPS HPS
HPS
TD1
TK
SV3E
TK5
SV41
SV42
PMV4
TE2
TD3
SV43
TK3
SV6
TO
SV3F
SV3C
SV
SV
SV
SV
SV
SV
SV
SV
SV
SV
SV
TL
PMV1
TD2
TS1
SV2
SV5
TE1
FM
SV3D
PMV2
TK2
SV3B
TK1
SV3A
HPS HPS
TD1
TK4
SV3
TK5
SV41
SV42
A3
SV3C
TO
SV
SV
SV
SV
SV
SV
SV
SV
SV
Balance pipe
Liquid pipe
Gas pipe
ON
ON
ON
Unit
transferring oil
Unit
receiving oil
4-way valve
4-way valve
High pressure sensor
High pressure sensor
Low pressure sensor
Low pressure sensor
O.S.
O.S.
Accumulator
Accumulator
Liquid tank
Liquid tank
Compressor
1
Compressor
1
Compressor
2
Compressor
2
Compressor
3
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