Valve Coils - Genie Z-40/23N Service And Repair Manual

Service and Repair Manual
Manifolds
7-5

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.
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.
60
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.
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
Proportional solenoid valve, 3 position
4 way, 20V DC
(schematic items AA, AB, AC, BC, BG,
BK, BN, BS, BU)
Solenoid valve, 20V DC (schematic item
BG)
Proportional solenoid relief valve,
20V DC (schematic item BW)
Z-40/23N, Z-40/23N RJ
September 2016
Specification
24 Ω
24 Ω
22 Ω
Part No. 1268528