Electronic Expansion Valve EX4-EX8 Emerson

EX4-EX8 Electrical Control Valve ( R-410A) Features • Fully hermetic design • Fast full stroke time • Applicable to all common refrigerants ( HCFC, HFC) , for subcritical CO2 applications • High resolution and excellent repeatability • Bi-flow versions for heat pump applications • Positive shut-off function to eliminate the use of an additional solenoid valve • Linear flow capacity • Wide capacity range ( 10 - 100% ) • Continuous modulation of mass flow, no stress ( liquid hammering) in the refrigeration circuit • Direct coupling of motor and valve for high reliability ( no gear mechanism) • Ceramic slide and port for accurate flow and minimal wear • Balanced force design • Corrosion resistant stainless steel body, and connections Specifications • CE marking: EX4/ EX5: not required EX6-EX8: required, Cat I, Module A • MOPD: EX4-EX6: 580 psid, EX7-EX8: 435 psid • MWP: 650 psig • Ambient temperature: -40° F to + 130° F • Humidity: 5 to 95% R.H. • External leakage: d 0.1 oz/ yr ( R-22) • Stepper motor type: Bi-polar, phase current by chopper control ( constant current) • Electrical connection: 4 pin terminal via plug • Driver supply voltage: Recommended: 24 VDC Range: 18-36 VDC • Phase current ( operating) : EX4-EX6: 500 mA max EX7: 750 mA EX8: 800 mA • Holding current: EX4-EX6: 100 mA EX7: 250 mA EX8: 500 mA • Nominal input power per phase: EX4-EX6: 3.5W EX7-EX8: 5W • Phase inductance: EX4-EX6: 30 mH ± 25% EX7: 20 mH ± 25% EX8: 22 mH ± 25% • Step mode: 2 phase full step • Step angle: 1.8° per step ± 8% • Total number of steps: EX4-EX6: 750 full steps EX7: 1600 full steps EX8: 2600 full steps • Stepping rate: 500 Hz • Winding resistance per phase: EX4-EX6: 13 ohm ± 10% EX7: 8 ohm ± 10% EX8: 6 ohm ± 10% • Full travel time: EX4-EX6: 1.5 seconds EX7: 3.2 seconds EX8: 5.2 seconds