Nakayama Pro GH9138 Battery LCD Water Timer
Shaping outdoor life.
Product Overview
The Nakayama Pro GH9138 is a battery-operated LCD water timer designed for automated garden watering. It allows users to customize watering schedules, including start time, duration, and frequency.
Key Components:
- DIAL: Rotate to customize watering schedule.
- OK/MANUAL BUTTON: Press "OK" to confirm time. Press and hold "MANUAL" to enter manual watering settings.
- DELAY/+ BUTTON: Use "+" to adjust time. Press and hold "DELAY" to activate rain delay.
- - BUTTON: Use "-" to adjust time.
Dial Positions and Functions:
| Dial Position | Function |
|---|---|
| SET CLOCK | Switch between 12/24 hour format and set the current time. |
| START TIME | Select the desired start time for watering. |
| HOW LONG | Determine the duration of watering. |
| HOW OFTEN | Select the watering frequency. |
| ON | The timer operates according to your customized schedule. |
| OFF | Turn off watering. |
Technical Specifications
| Technical Data | Details |
|---|---|
| Model | GH9138 |
| Inlet Thread | 3/4" |
| Outlet Thread | 3/4" |
| Watering Duration | From 1 minute to 4 hours |
| Watering Frequency | Every 1 hour to 12 hours, and every 1 day to 7 days |
| Operating Water Pressure | 0.5 bar to 8 bar |
| Other Features | IPX4 water proof, Manual watering for 10 minutes, LCD screen, Powered by 2xAAA batteries (not included). |
Installation
Installing the Batteries:
- Remove the battery compartment cover on the back of the timer.
- Insert 2 new AAA (1.5V) alkaline batteries (not included).
- Replace the battery compartment cover and press firmly to ensure a complete seal.
NOTE: Ensure the battery tray cover is securely installed for waterproofing. Remove batteries for long periods of inactivity. Replace batteries when the low battery indicator appears. Do not dispose of batteries in fire. Use new AAA alkaline batteries and do not mix old and new, or different battery types.
Installing the Timer:
- Turn off the garden faucet.
- Wrap Teflon tape around the faucet threads.
- Screw the timer to the garden faucet, positioning the display vertically to prevent rainwater accumulation.
- Wrap Teflon tape around the timer outlet threads.
- Screw the garden hose to the timer outlet.
- Turn on the faucet after programming.
Tips: Use Teflon tape on threads for a leak-free installation. If faucet threads do not tighten fully, use a rubber washer.
Activating the Timer Before Use
Activate the device before first use or after a period of inactivity.
- Keep the garden faucet turned off.
- Turn the timer dial to "ON".
- Press and hold the "MANUAL" button for 3-5 seconds to enter Manual Watering Mode.
- When the screen flashes, press "OK" to start manual watering.
- After hearing a "click" sound or waiting for about 5 seconds, the valve opens. Turn the dial to "OFF" to close the valve.
- Repeat steps 2-5 for 3-5 times.
- Test by slightly opening the faucet and repeating steps 2-5 to check water flow.
Note: Keep away from the timer outlet during testing to avoid getting wet.
Programming the Timer
STEP 1: SET CLOCK
- Turn the dial to SET CLOCK.
- Use "+" or "-" to select 12/24 hour format and press "OK" to confirm.
- Use "OK" to switch between hours and minutes.
- Turn the dial clockwise to save and proceed to the next step.
Tips: Turn the dial to save changes instead of pressing "OK" to avoid returning to the previous setting.
STEP 2: START TIME
- Turn the dial to START TIME.
- Use "+" or "-" to set the desired start time (AM/PM).
- Use "OK" to switch between hours and minutes.
- Turn the dial clockwise to save and proceed to the next step.
Tips: Turn the dial to save changes instead of pressing "OK" to avoid returning to the previous setting.
STEP 3: HOW LONG
- Turn the dial to HOW LONG.
- Use "+" or "-" to select watering duration from 1 minute to 3 hours 59 minutes.
- Use "OK" to switch between hours and minutes.
- Turn the dial clockwise to save and proceed to the next step.
Tips: Turn the dial to save changes instead of pressing "OK" to avoid returning to the previous setting.
STEP 4: HOW OFTEN
- Turn the dial to HOW OFTEN.
- Use "+" or "-" to set watering frequency (every 1-12 hours or every 1-7 days).
- Turn the dial clockwise to save and proceed to the next step.
Tips: Turn the dial to save changes instead of pressing "OK" to avoid returning to the previous setting. Ensure "HOW OFTEN" is greater than "HOW LONG".
STEP 5: AUTOMATIC WATERING
- Turn the dial to "ON".
- The LCD screen will display the current time and the next watering start time.
NOTE: Automatic watering only runs when the dial is in the "ON" position.
The timer is now programmed. It will water automatically based on the set start time, duration, and frequency. Keep the faucet open.
If the dial is not in the "ON" position, watering programs will be interrupted. Automatic watering only occurs when the dial is set to "ON". If the current time has passed the programmed START TIME, watering for the day will be skipped, and the program will resume the next day.
Additional Functions
RAIN DELAY
This function allows you to postpone watering for a set period without interrupting the original schedule. To activate:
- With the dial on "ON", press and hold the "DELAY" button for 3-5 seconds.
- Use "+" or "-" to select the delay period (24H, 48H, or 72H).
- Press "OK" to activate the rain delay. All watering plans will be skipped during this period.
- To remove rain delay, press and hold "DELAY" again for 3-5 seconds.
Note: Press "OK" after selecting the delay time to start the program. Otherwise, the setting will exit automatically.
MANUAL / HAND WATERING
This function allows manual watering without interrupting the set schedule. To access:
- Turn the dial to "ON".
- Press and hold the "MANUAL" button for 3-5 seconds to enter manual watering mode.
- Use "+" or "-" to adjust the manual watering time (1 minute to 8 hours, default is 10 minutes).
- Press "OK" to start manual watering.
- To stop manual watering, press and hold "MANUAL" for 3-5 seconds to exit and restore the original program.
Note: Press "OK" after setting the manual watering time to start it. Otherwise, the setting will exit automatically.
OFF MODE
Turn the dial to "OFF" to stop watering for an extended period. Your settings are saved. The timer will not water automatically in OFF mode. Turn the dial back to "ON" to resume the programmed schedule.
STOPPING RUNNING WATER
If the timer is watering and you need to stop it, activate and cancel Manual Watering. The current watering will be skipped, but subsequent schedules will not be affected.
Battery Status
The battery status is displayed on the screen. Replace batteries promptly when the low power indicator appears to avoid interruptions.
Troubleshooting
| Problem | Possible Cause | Possible Solution |
|---|---|---|
| Water inlet leakage | No filter or filter not placed horizontally. Faucet is not standard 3/4". | Add a filter and ensure it's placed horizontally. Ensure faucet is standard 3/4". Wrap Teflon tape tightly on the faucet. |
| Water does not stop/flow out | Long storage/transport made the valve inactive. Valve blockage. | Keep faucet off, turn timer to ON. Run manual watering for 5-7 seconds and stop. Repeat 3-5 times. Try normal use. |
| No response for manual/rain delay function | Did not press OK after setting time to save and run. | Press OK again after setting time to confirm. |
| Short battery life | Mixed use of old and new batteries. Using carbon or rechargeable batteries. | Use new alkaline batteries. Alkaline batteries have a longer lifespan. |
| Low water pressure | Inlet pressure insufficient for watering needs. | Check filter for blockage. Ensure correct timer installation. Consider a pressure booster pump. |
| LCD screen does not display | Battery is exhausted. Display exposed to direct sunlight. | Replace batteries. Avoid direct sunlight. |
Cleaning Your Timer
Regular cleaning ensures proper operation. Follow these steps:
- Turn off the garden faucet and remove the timer. Check the filter for impurities.
- If the filter is dirty, remove and rinse it with running water.
- Turn on manual watering mode to open the valve and check for blockages in the water pipe. Clean gently with a small brush if necessary.
Warnings
- For outdoor use only. Sheltered outdoor placement prolongs lifespan.
- Tighten without tools to avoid damage.
- Ensure the filter is placed horizontally in the water inlet to prevent leaks.
- Replace batteries promptly when low power is indicated to avoid operational interruptions. Ensure the battery tray is dry during replacement.
- Remove batteries and store indoors when the timer is not in use.
- Do not use the timer in temperatures above 50°C (120°F) or below 3°C (38°F).
- Do not expose the product to extreme force or shock.
- Avoid spraying water into electrical outlets or sources. Never immerse the product in water.
