ISM Installation, Programming & Operation Guide
Page 36
Connect Field Wires to Remote Control Valves
3. If your system includes a master valve on
its main line supply, or a 24-volt pump
start relay (for activating a pump during
irrigation), connect a wire from the device
to the “MV” terminal on the timer’s terminal
strip. (The timer does not provide the main
power for a pump.) Connect the other wire
lead on the device to the valve common
wire.
4. That completes the mounting and wiring
procedures for your ISM sprinkler timer.
Replace the lower access cover on the
timer, and you are ready to begin
programming. Refer to “Programming the
Sprinkler Timer” on page 15.
The wires coming back to the timer from the
electric valves in the field can be routed into
the timer through the hole in the bottom of
the cabinet.
Fig. A shows the various wire runs and
connections between the timer and the other
devices. Each valve should have its own,
separate control wire. Use only wire that is
code-approved for underground, low-voltage
purposes.
1. Connect one end of the control wire to a
numbered station terminal on the timer’s
terminal strip.
2. Connect the other end of the control wire
to one of the wire leads on the valve
solenoid. The wire connectors at the
valves must be waterproof. Connect the
valve common wire to the “COM” terminal
on the terminal strip. Route the common
wire out to the furthest valve, and connect
the valve common wire to the remaining
wire lead on each valve.