Valve Coils - Genie S-40 Service Manual

October 2013
7-15

Valve Coils

How to Test a Coil
A properly functioning coil provides an
electromagnetic force which operates the solenoid
valve. Critical to normal operation is continuity
within the coil. Zero resistance or infinite
resistance indicates the coil has failed.
Since coil resistance is sensitive to temperature,
resistance values outside specification can produce
erratic operation. When coil resistance decreases
below specification, amperage increases. As
resistance rises above specification, voltage
increases.
While valves may operate when coil resistance is
outside specification, maintaining coils within
specification will help ensure proper valve function
over a wide range of operating temperatures.
Electrocution/burn hazard. Contact
with electrically charged circuits
could result in death or serious
injury. Remove all rings, watches
and other jewelry.
Note: If the machine has been in operation, allow
the coil to cool at least 3 hours before performing
this test.
1 Tag and disconnect the wiring from the coil to be
tested.
2 Test the coil resistance using a multimeter set
to resistance (Ω). Refer to the Valve Coil
Resistance Specification table.
Result: If the resistance is not within the
adjusted specification, plus or minus 10%,
replace the coil.
Part No. 102521
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.
Description
Solenoid valve, 2 position 3 way, 10V DC
(schematic items AC and AE)
Solenoid valve, 3 position 4 way, 10V DC
(schematic item AT and AZ)
Solenoid valve, 2 position 3 way, 10V DC
(schematic items AU, AV, AX, and AY)
Solenoid valve, 3 position 4 way, 10V DC
(schematic items AZ and BF)
Proportional solenoid valve, 12V DC
(schematic items AW and BB)
Solenoid valve, 2 position 3 way, 10V DC
(schematic item CC)
Solenoid valve, 2 position 3 way, 10V DC
(schematic items DA)
Solenoid valve, 2 position 3 way, 12V DC
(schematic items CE)
S-40 • S-45
Section 4 • Repair Procedures
MANIFOLDS
Specification
6.3 Ω
6.3 Ω
6.3 Ω
6.3 Ω
9 Ω
6.8 Ω
3.3 Ω
4.8 Ω
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