Part No. 139378
Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
4 - 41
June 2011
Section 4 • Repair Procedures
REV B
7-4
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.
Coils with 2 terminals:
Connect the leads from
the ohmmeter to the valve coil terminals.
Coils with 1 terminal:
Connect the positive
lead from the ohmmeter to the valve coil
terminal, then connect the negative lead from
the ohmmeter to the internal ring of the valve
coil.
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
Note: The following coil resistance specifications
are at an ambient temperature of 68°F / 20°C. As
valve coil resistance is sensitive to changes in air
temperature, the coil resistance will typically
increase or decrease by 4% for each 18°F / 10°C
that your air temperature increases or decreases
from 68°F / 20°C.
Valve Coil Resistance Specification
Description
Specification
Solenoid valve, 3 position 4 way, 20V DC
22
Ω
(schematic items A, J, K, U, V, Y, AA, BB and CC)
Proportional solenoid valve, 24V DC
19.5
Ω
(schematic item H)
Solenoid valve, N.C. poppet, 20V DC
23.5
Ω
(schematic item M)
Solenoid valve, N.O. poppet, 20V DC
23.5
Ω
(schematic item P)
MANIFOLDS
Summary of Contents for Z-30/20N
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