4
D. Activating/testing a solenoid at the valve
1. Put the top switch to the OFF mode.
2. Disconnect the solenoid from the station and common wires.
3. Attach the red and black leads to the solenoid wires.
4. Switch to SOLENOID mode and select side switch to
ACTIVATE.
5. The solenoid should activate and the GOOD LED (see display
on front of unit) should turn on.
6. If the solenoid does not activate, one of the following
conditions may exist:
•Short: SHORT LED is on (< 10 Ohm)
•Open: OPEN LED is on (> 200 Ohm)
NOTE: If the GOOD LED is on and the solenoid does not activate,
it may be due to a mechanical failure in the valve.
E. Activating/Deactivating “DC Latching Solenoids”
Battery-operated controllers use “DC Latching Solenoids” instead
of the traditional 24 VAC solenoids. Fortunately, the Pro48 can
activate/deactivate both types of solenoids. The method for
activating and deactivating a DC latching solenoid is slightly
different, so perform the following steps when working with them:
1. To activate, or “latch” the solenoid, connect the Pro48’s red
test lead to the red wire of the solenoid, and the black test
lead to the black wire.
2. Then momentarily activate the solenoid by flipping the top
toggle switch to the left toward SOLENOID.
3. Then flip the toggle switch on top of the Pro48 back to the
middle/neutral position. These solenoids latch themselves
and don’t require constant power to hold it, so this will
conserve the 9V batteries in the Pro48.
4. To deactivate, or “unlatch” the solenoid, connect the Pro48’s
red test lead to the black wire of the solenoid, and the black
test lead to the red wire.
5. Then flip the top toggle switch to the left toward SOLENOID.
This will deactivate, or unlatch the solenoid.
