4 - 38 Genie TZ-50 Part No. 824982September 2014Section 4 • Repair Procedures8-5Valve CoilsHow to Test a CoilA properly functioning coil provides anelectromotive force which operates the solenoidvalve. Critical to normal operation is continuitywithin the coil that provides this force field.Electrocution hazard. Contact withelectrically charged circuits couldresult in death or serious injury.Remove all rings, watches andother jewelry.1 Tag and disconnect the wire harness from thecoil to be tested.2 Test the coil resistance.Result: The resistance should be withinspecification, plus or minus 30%.Result: If the resistance is not withinspecification, plus or minus 30%, replace thecoil.Valve Coil ResistanceDescription SpecificationSolenoid valve, 2 position 3 way 25 to 27Ω20V DC with diode(schematic items F, G, I, AA and AB)Solenoid valve, 3 position 4 way 25 to 27Ω20V DC with diode(schematic items J, M, Q, AD and AE)Solenoid valve, 2 position 4 way 25 to 27Ω20V DC with diode(schematic item Bl and BN)Solenoid valve, 2 position 2 way N.C. 25 to 27Ω20V DC with diode (schematic item BI)Proportional valve, 2 position 2 way N.C. 25 to 27Ω20V DC with diode (schematic item BK and BO)Solenoid valve, 2 position 2 way N.C.29 to 31W24V DC with diode(schematic items CA, CB, CC and CD)MANIFOLDS
