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Melnor HydroLogic 73100 User Instructions
Melnor HydroLogic 73100 User Instructions

Melnor HydroLogic 73100 User Instructions

Advanced two-zone electronic water timer

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WATER DAY
NEXT START
WATER
AM
PM
TODAY
SU
ZONE
Advanced Two-Zone Electronic Water Timer
User Instructions
WATER DAY
START WATER
CYCLE
NEXT START
TIME
A B C D
WATER
DAY
EVERY
DELAY
AM
HRS
PM
DAY
MIN
TODAY
SU
MO
TU
WE
TH
FR SA
ZONE
MANUAL
RESET
1 2 3 4
RAIN DELAY, HOLD
Zone 1
1
Understanding Zones
This is a two zone timer allowing you to water two different areas from the
same faucet.
Each zone can be programmed with up to four different start times.
You can use the PLANNING TABLE provided on the back of this sheet to
help organize your watering schedule for each zone.
2
Battery Installation & Assembly
Remove the battery holder from the back
of the Timer Control Unit. Insert two AA
alkaline batteries (Do not use rechargeable
batteries) as indicated on the battery holder.
Replace the battery holder, making sure that
it is firmly and securely placed in the Timer
Control Unit.
NOTE: Do not use your timer when the air
temperature is below 40°F (4.5° C). When
storing your timer, be sure it is in a dry place
and protected from frost.
We recommend replacing batteries when the indicator reaches
Installation of the Timer
Attach the timer to an outside faucet and turn on the water. The water must
be left on while the timer is attached to the faucet for your timer to operate.
NOTE: You may choose to program your timer before or after attaching it
to the faucet.
3
SET CLOCK: "Set Current Time and Day"
The Water Timer default setting is a 12-hour mode (AM/PM). To ensure
correct timing, look for either AM or PM to the left of the time. To switch
between 12-hour (AM/PM) and 24-hour (military time), hold the
for 5 seconds. 12-hour mode shows AM or PM while 24-hour mode does
not. Note: Changing time mode will erase all programs.
Before setting your watering times, you must first set the current time and
day of the week. When the batteries are first installed, the arrow in the
screen will point to CLOCK. If it is not in that
position, press the
button until the arrow
is pointing to CLOCK.
On your screen, a flashing box will appear
around the SU. Simply set the timer to the
current day by pressing the
on the touchpad until the square is on the
correct day. Once the correct day has been
indicated, press the
button.
To set the time, press the
until the correct time appears on the screen, and then press
Press the
button (at the top of the touch pad) to move to WATER DAY.
START WATER
CYCLE
TIME
A B C D
DAY
EVERY
DELAY
OK
HRS
DAY
MIN
MO
TU
WE
TH
FR SA
MANUAL
RESET
1 2 3 4
RAIN DELAY, HOLD
73100
English
73100_INS_ENG_02
Cursor Button
+/- Buttons
OK
OK Button
Cycle Button
Manual Watering Button
Zone Button
Battery Indicator
Zone 2
WATER DAY
NEXT START
WATER
DAY
AM
and
buttons
PM
TODAY
SU
MO
TU
ZONE
RESET
1 2 3 4
RAIN DELAY, HOLD
and
buttons
4
WATER DAY: "What days do you want to water?"
Check to be sure that the arrow on the screen is pointing to WATER DAY.
With this setting, you can select specific days to water or an interval period
of the day when watering will occur.
To set the watering day, use the
week you wish to water. Press the
week is highlighted on the screen. You can
select as many days as you like. The days
selected will have a square around them.
To water at preset intervals, press the
button on the buttonpad to navigate past the
days of the week. Press the
to set the time period (EVERY 1 DAY through
EVERY 7 DAY(s) ).
Press the
WATER.
Note: You will see Zone 1 highlighted at the bottom of
the screen; program Zone 1 before moving on to Zone 2.
5
START WATER: "What time-of-day do you want to water?"
You can select up to four independant start times (CYCLE A, B, C, D). With
the arrow pointing to Start Water on your screen, CYCLE A should be
highlighted, use the
If you want to set another START WATER time, press
CYCLE B. Repeat the process above to set the next START WATER time.
You may select up to four START WATER times.
When you have set all desired START WATER times, press
the
Hold the
6
HOW LONG: "Set the length of each watering cycle."
With the arrow pointing to HOW LONG, use the
the length of each watering cycle. After setting HOW LONG you want to
water during a selected cycle, press
until HOW LONG has been set for each cycle.
HOW LONG can be set for up to 360 minutes (6 hours) for each watering
cycle. The Cycle length cannot overlap the next START WATER time.
Note: You can only select Watering Cycles if you have set a start time in
Step 5 above.
7
SETTING ANOTHER ZONE: "Keep your plants watered
on separate cycles."
When you have set WATER DAY, START WATER, and HOW LONG for
Zone 1, press the
Press
When all desired zones are set, press the
button
8
AUTO MODE: "Your timer is ready to go."
START WATER
CYCLE
In AUTO Mode, your timer will run the watering program you have entered.
TIME
A B C D
EVERY
DELAY
The screen display will alternate between showing the current time and the
HRS
DAY
next watering cycle of each zone.
MIN
WE
TH
FR SA
MANUAL
.
and
button when the desired day-of-the-
and
buttons
button to move to START
and
buttons to select the first watering time.
button to move to HOW LONG.
or
buttons to advance settings
more quickly.
button back to WATER DAY.
to select Zone 2, and repeat steps 4-6 above.
buttons to select the day-of-the-
WATER DAY
START WATER
CYCLE
NEXT START
TIME
A B C D
WATER
DAY
EVERY
DELAY
AM
HRS
PM
DAY
MIN
TODAY
SU
MO
TU
WE
TH
FR SA
ZONE
MANUAL
RESET
1
2
RAIN DELAY, HOLD
to move to
WATER DAY
START WATER
CYCLE
NEXT
START
TIME
A B C D
WATER
DAY
EVERY
DELAY
HRS
AM
DAY
PM
TODAY
MIN
SU
MO
TU
WE
TH
FR SA
ZONE
MANUAL
RESET
1 2 3 4
RAIN DELAY, HOLD
and
buttons to select
to move to the next cycle. Repeat
WATER DAY
START WATER
CYCLE
NEXT START
TIME
A B C D
WATER
DAY
EVERY
DELAY
AM
HRS
PM
DAY
TODAY
MIN
SU
MO
TU
WE
TH
FR SA
ZONE
MANUAL
RESET
1 2 3 4
RAIN DELAY, HOLD
button to enter AUTO mode.
WATER DAY
START WATER
CYCLE
NEXT START
TIME
A B C D
WATER
DAY
EVERY
DELAY
HRS
AM
PM
DAY
TODAY
MIN
SU
MO
TU
WE
TH
FR SA
ZONE
MANUAL
RESET
1
2
RAIN DELAY, HOLD

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Do you have a question about the HydroLogic 73100 and is the answer not in the manual?

Questions and answers

Clyde Robison
June 17, 2025

Also, my timer does not work in the manual mode, and if I cycle through the on-off manual setting three times, it shows only reset in small letters on the screen, and of course, I have to reprogram all over again. Very difficult water timer.

Clyde Robison
June 17, 2025

What is the purpose and use of the cycles? I've set all cycles the same to ensure it waters the same each day.WHY would one want to water different times each day?

Summary of Contents for Melnor HydroLogic 73100

  • Page 1 WATER DAY: “What days do you want to water?” Check to be sure that the arrow on the screen is pointing to WATER DAY. ■ With this setting, you can select specific days to water or an interval period of the day when watering will occur. WATER DAY START WATER To set the watering day, use the...
  • Page 2 RAIN DELAY: “Prevent watering when rain is in the USEFUL TIPS forecast.” Open Valve During Installation If there is rain in the forecast, you can temporarily suspend your watering ■ program on both zones for up to 7 days using the RAIN DELAY Shaking during transportation can cause valves to be open.