Irritrol MC-E - Manual (Page 37)

Catastrophic Flow Sensor Protection (Optional Setup)
The MC-E provides a function to detect an unscheduled flow. Any detected flow in the system when no station is watering
is considered an unscheduled flow. The MC-E has the capability to monitor any unscheduled flow and activate Station 2
as a flow alarm to shut off a normally open master valve.
The flow alarm can be used to activate a normally open master valve which is installed ahead of the other valves on the
system. Station 2 must be set to flow alarm in SETUP for this to function. The F00 (“F00” represents the upper flow limit
for the main line) parameters in the flow setup will dictate the overflow threshold of the main line. When at any time MC-
E detects an unscheduled flow that violates F00 overflow parameters, MC-E will activate station 2 to close the normally
open master valve.
Install Critical Flow Shut off Master Valve
Step 1 – Find a location along the sub-main pipe that services
the irrigation system to install the normally open
master valve. The location should be ahead of any
valves in the irrigation system. Refer to the valves
installation instructions for further details.
Step 2 – Route a two-wire irrigation cable from the valve
to the controller. Connect one solenoid wire to the
valve common terminal and the remaining solenoid
wire to the Station 2 terminal.
Step 3 – Check for proper operation.
Configure Station for Flow Alarm Function
Step 1 – Place the Function dial to the SETUP position.
Step 2 – Press . Station 2 setup screen will be displayed.
Step 3 – Press the button to configure Station 2 as flow alarm to activate a normally-open master valve or press the
button to configure it back to station. Press to activate your selection.
Step 4 – Return the Function dial to AUTO/RUN position.
Catastrophic Flow Parameters
Step 1 – To assign F00’s flow value (Catastrophic flow), place the Function dial to the FLOW SENSING
position. Navigate to the Over percentage limit screen by pressing the button. If F00 is not the displayed
station number, press the button repeatedly until F00 is selected.
Step 2 – Enter the desired catastrophic flow value and press .
Do not set the Catastrophic flow value below the rated minimum flow of your flow sensor or it may
not function properly.
For example: If your flow sensor is rated at 20–300 GPM, DO NOT set the F00 flow value below 20 GPM.
Step 3 – Adjust the catastrophic Overflow. See “Set Overflow percentages” section.
Offset Value Flow Unit
K Value Size Code
Flow Sensor
Station 1
Station 3
Station 4
Flow
Normally Open
Master Valve
(Station 2)
COM
FLOW +
COM
Sta 2
FLOW – or
SENSOR
–
Sta 1
Sta 3
Sta 4