Part No. 237062
Z-45/25 Bi-Energy • Z-45/25J Bi-Energy
4 - 41
September 2015
Section 4 • Repair Procedures
9-5
Valve Coils
How to Test a Coil
A properly functioning coil provides an
electromotive force which operates the solenoid
valve. Critical to normal operation is continuity
within the coil that provides this force field.
Electrocution/burn hazard. Contact
with electrically charged circuits
could result in death or serious
injury. Remove all rings, watches
and other jewelry.
1 Tag and disconnect the wiring from the coil to
be tested.
2 Test the coil resistance.
Result: The resistance should be within
specification, plus or minus 30%.
Result: If the resistance is not within
specification, plus or minus 30%, replace the
coil.
Valve Coil Resistance Specification
Solenoid 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 Diode
Properly functioning coil diodes protect the
electrical circuit by suppressing voltage spikes.
Voltage spikes naturally occur within a function
circuit following the interruption of electrical current
to a coil. Faulty diodes can fail to protect the
electrical system, resulting in a tripped circuit
breaker or component damage.
Electrocution/burn hazard. Contact
with electrically charged circuits
could result in death or serious
injury. Remove all rings, watches
and other jewelry.
1 Test the coil for resistance. See
How to Test a
Coil.
MANIFOLDS
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