Valve Coils - Genie Z-30/20N Service Manual

April 2016
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.
Part No. 139378
Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
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
Solenoid valve, 3 position 4 way, 20V DC
(schematic items A, J, K, U, V, Y, AA, BB and
CC)
Proportional solenoid valve, 24V DC
(schematic item H)
Solenoid valve, N.C. poppet, 20V DC
(schematic item M)
Solenoid valve, N.O. poppet, 20V DC
(schematic item P)
Service Manual
Manifolds
Specification
22 Ω
19.5 Ω
23.5 Ω
23.5 Ω
87