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Emerson Climate Technologies
97
EX Valves & Controls
Features
• Fullyhermeticdesign
• Fastfullstroketime
• Applicabletoallcommonrefrigerants(HCFC,HFC),for
 subcriticalCO
2
applications
• Highresolutionandexcellentrepeatability
• Bi-owversionsforheatpumpapplications
• Positiveshut-offfunctiontoeliminatetheuseofan
 additionalsolenoidvalve
• Linearowcapacity
• Widecapacityrange(10-100%)
• Continuousmodulationofmassow,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ow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:507psid
  EX8:435psid
• MWP: EX4-EX7:870psig
  EX8:650psig
• Ambienttemperature: -40°Fto+130°F
• Humidity: 5to95%R.H.
• Externalleakage: ≤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
TheEX4-EX8aresteppermotordrivenvalvesthatareoptimizedforthe
controlofliquidorgaseousmassowinrefrigerationsystems.Multifunction
capabilityasexpansionvalve,hotgasbypass,suctiongasthrottling,head
pressure,liquidlineactuatorandotherapplicationssystems.
Valve
Type
Inlet x Outlet
(ODF)
B C D E H1 H2
EX4-I21 3/8”x5/8” 0.3 1.8 2.2 0.4 4.4 1.0
EX5-U21 5/8”x7/8” 0.4 2.2 2.6 0.6 4.4 1.0
EX6-I21 7/8”x1-1/8” 0.6 2.6 3.0 0.7 4.4 1.0
EX7-I21 1-1/8”x1-3/8” 0.8 3.1 3.2 0.9 6.2 1.7
EX8-I21 1-5/8”x1-5/8” 0.8 3.1 3.1 0.8 7.9 2.2
Dimensional Data (in)
EX4-EX8 Electrical Control Valve