Part No. 237062 Z-45/25 Bi-Energy • Z-45/25J Bi-Energy 4 - 41September 2015 Section 4 • Repair Procedures9-5Valve 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/burn hazard. Contactwith electrically charged circuitscould result in death or seriousinjury. Remove all rings, watchesand other jewelry.1 Tag and disconnect the wiring from the coil tobe 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 Resistance SpecificationSolenoid valve, 3 position 4 way, 20V DC 25 to 29 Ω(schematic items B, C, D, E, F and H)Solenoid valve, 2 position 3 way, 20V DC 25 to 29 Ω(schematic items A, K, S and AA)Proportional solenoid valve, 24V DC 17 to 21 Ω(schematic item I)How to Test a Coil DiodeProperly functioning coil diodes protect theelectrical circuit by suppressing voltage spikes.Voltage spikes naturally occur within a functioncircuit following the interruption of electrical currentto a coil. Faulty diodes can fail to protect theelectrical system, resulting in a tripped circuitbreaker or component damage.Electrocution/burn hazard. Contactwith electrically charged circuitscould result in death or seriousinjury. Remove all rings, watchesand other jewelry.1 Test the coil for resistance. SeeHow to Test aCoil.MANIFOLDS
