Electronic Expansion Valve For Indoor Units - Hitachi RPI-0.8FSG1 Service Manual

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3.6.2 Electronic Expansion Valve for Indoor Units

Micro-Computer
Pulse Signal
2-Phase Permanent Magnetic Pulse Motor
Control 0 to 2,000 Pulse by 1 Pulse
Refrigerant Flow Control
Specifications
Items
Type
Refrigerant Used
Working Temperature
Range
Mounting Direction
Flow Direction
Rated Electricity
Drive Method
Rated Voltage
Drive Condition
Coil Resistance
(1 Phase)
Wiring Diagram,
Drive Circuit and
Activation Mode
3-24
Precise Control
Drive shaft in Vertical Direction, Motor Upside and 90
1φ
M
3φ
2φ
Pulse Motor
Driver
Specifications
EDM Type
R22 or R407C
o o
-30 C to 70 C (With Coils Not Electrified)
Reversible
4-Phase Pulse Motor Method
DC12V+1.2V
100Ω+250PPS (Pulse Width Over 3mm)
2 Phase Excitation
150+10% (at 20
Procedure
Phase
1φ
2φ
Wiring
Diagram
4φ
3φ
4φ
Drive
Valve
DC12V
Circuit
Activation
Magnet
Gear
Bellows
Valve
o
in Four Direction
o
C)
1 2 3 4
ON
OFF
Close Open
Activation
Coil
1