Daikin VRV Service Manual

Si30-408 Method of Troubleshooting
Troubleshooting 83
3.3 Structure and Operation of Electronic Expansion Valve
For VRV system, EBM type linear control valve is employed to use as an electronic expansion
valve for superheated degree control or subcooled degree control.
In the valve, single-phase excitation drive type pulse motor is employed. On receiving 2000 pls
signal, goes to full open. The stroke of gear is 0.7 mm from full open to complete close. The
below figure shows the inside structure of driving section, and the gear ratio is 1 / 30.
Electronic expansion valve driving part
Pulse motor
Output shaft
Main body
mounting nut
Valve body
Motor shaft
Gear part
Bellows
Mold part

Daikin VRV Specifications

General

Brand	Daikin
Energy Efficiency	High
Control	Centralized and individual zone control
Inverter Technology	Yes
Type	Variable Refrigerant Volume (VRV)
Cooling Capacity	Varies by model
Heating Capacity	Varies by model
Refrigerant	R-32 or R-410A
Application	Commercial buildings, large residential spaces
SEER	Varies by model
HSPF	Varies by model
EER	Varies by model
COP	Varies by model
Sound Level	Varies by model
Indoor Unit Options	wall-mounted, ducted