6
Connect the transformer
Refer to Figure 2 and connect the yellow wire to the terminal marked "YELLOW, red
wire to "RED," and blue wire to "BLUE".
Tip!
To avoid short-circuiting the transformer, always connect the wires to the terminal
before plugging in the transformer.
Install the battery
A 9-volt battery (not included) is used to maintain the programming for up to 24 hours
if a power failure should occur. The battery will not allow the timer to open any valves.
The timer will remember the approximate clock time and all programs. If the power
outage occurred during a watering cycle, that cycle will resume and be completed, as
will any missed cycles.
If the battery is dead, none of the programming will be retained. In this event, the timer
will revert to the emergency back-up program, which waters once per day, every day,
starting 8 hours after the power is restored. All programming needs to be reset.
Using the pump start circuit
Pump start or master valve capability is available only on the PC-204-PS and PC-206-
PS models. This circuit allows the timer to be used in conjunction with a "pump relay
switch" (Rain Bird model PCR-1) which when activated by the timer, will in turn acti-
vate the pump. The pump start circuit can also be used to operate a standard 24 volt
"master valve.”
The hot wire of the relay switch connects to the terminal marked MV. The common
wire connects to the regular system common terminal. See the pump relays instruc-
tions for details.
Caution!
Be sure the total current draw of the relay switch plus the station valve
doesn't exceed 650 milliamps. If it does, your fuse will blow.
Tip!
To avoid possible pump damage during an emergency backup schedule, wire
each unused station to a station being used. This prevents the pump from operating
Transformer and Battery
Connecting to the valves
Each valve connects to the timer through two wires. One wire from each valve
solenoid must connect to the output terminal of the timer through a color-coded strand.
This is the "HOT" connection. Connect valve #1 to terminal #1, valve #2 to terminal
#2, etc. (Figure 2, previous page).
The second wire must connect to the (COM) common terminal of the timer. This is the
COMMON connection. If the valves are grouped closely, it is easier to join the com-
mon wires from each valve and run one wire (usually the white wire) to the timers com-
mon terminal.
Note:
Only one valve may be connected to each station’s output terminal.
