10. Glossary
Rain Bird
®
ET Manager Series - Installation and Operation Manual
75
Historical ET Mode:
Historical ET mode uses an aver-
age daily ET for each month programmed in the ET
Manager instead of the weather signal data to operate.
In the Historical ET Control Mode information from the
weather signal is ignored. If there is an on-site rain
gauge, the rain data collected will be used to adjust
watering schedules.
Hour Manual Override:
Your ET Manager can be tem-
porarily “Overridden” to allow manual watering. Each
time the Override is pressed, one more hour is added to
the Override mode. The “Hour Manual Override” status
message indicates when an Override has been started
and the amount of time left before it reverts back to the
normal operating mode.
Humidity:
Relative humidity is measured at the weath-
er station and is included in the weather signal to cal-
culate ET.
Information Log:
Your ET Manager reports important
information such as: the last time the sprinklers
watered, how many times the sprinklers watered, how
much water has been applied, the last weather inter-
rupt and signal accuracy. Find these values in the infor-
mation log menu.
Irrigation Amount:
The amount of water, in inches (or
mm) applied to your landscape by each watering
cycle(s). This amount of water must evaporate before
the ET Manager will allow watering to occur. The
Irrigation Amount is based on your soil type and the
plant root depth.
Irrigation Status:
You can view the details of the current
Moisture Levels for Valve Group A and B, Moisture Level
graphs, ET, and rainfall information stored over the last
two weeks in the Irrigation Status menu.
Landscape Adjustment Percentage:
The Landscape
Adjustment Percentage is used to adjust for site-spe-
cific landscape needs for Valve Group A and Valve
Group B. The Landscape Adjustment Percentage is
applied to the calculated ET, and effects the current
Moisture Levels for Valve Groups A and B.
Last Interrupt:
The Last Interrupt displays the cause,
date, and time of the last weather interrupt. Weather
interrupts occur during irrigation when specific condi-
tions are met. Weather interrupts can be programmed
for temperature, wind, or rain conditions.
LCD Display:
The graphical display is used to view cur-
rent operating conditions, monitor status, view settings,
and make programming changes.
Look-Ahead Feature:
If Available Days have been
restricted and not set to “All,” the ET Manager looks
ahead each day to determine if watering should occur
even though the Moisture Level has not reached zero.
Master Valve Control:
Master valve control can be uti-
lized with your ET Manager, refer to Appendix X.
Max Hourly Rain:
The Maximum Hourly Rain is the
maximum amount of rain that will be accepted each
hour in the soil moisture level, see Effective Rain.
Menu Path:
Menu paths are found throughout the
manual to show which items within the menu and sub-
menus need to be selected to access key information or
to adjust settings.
Example of a Menu path:
Main Menu
Settings
Irrigation Status
“A” Moisture Level
Missing Data:
The ET Manager checks and stores data
received in the weather signal. If data is missed then
ET is calculated using a data replacement formula. If
signal reception accuracy is less than 65% then the
Missing Data alert will come on due to 35% of missing
data.
Moisture Level:
Moisture is depleted from the soil due
to evaporation. Rain and water from the sprinkler sys-
tem replaces this water. Your ET Manager computes the
current Moisture Levels for Valve Group A and Valve
Group B. When the Moisture Level reaches 0, watering
is enabled and the sprinkler controller is allowed to
water.