Restmo O-HT-4A3-GN
RESTMO Three Knob Sprinkler Timer User Manual
Model: O-HT-4A3-GN | Brand: Restmo
1. Introduzione
Thank you for choosing the RESTMO Three Knob Sprinkler Timer. This mechanical control automatic irrigation timer is designed to simplify your watering tasks, offering reliable and efficient operation for your garden hose and sprinkler system. Its intuitive 3-dial interface allows for easy setup of automatic, manual, and rain delay functions. Please read this manual carefully to ensure proper installation and operation.

Figure 1.1: RESTMO Three Knob Sprinkler Timer with its components.
2. Prodotto finitoview
The RESTMO Sprinkler Timer features a robust design with three distinct control dials for comprehensive watering management. It is equipped with necessary adapters for versatile connection to various water sources.
Caratteristiche principali:
- Controllo meccanico: Simple and durable mechanical dials for setting watering parameters.
- Automatic Irrigation: Set frequency and duration for hands-free watering.
- Irrigazione manuale: Initiate immediate watering without disrupting programmed schedules.
- Ritardo pioggia: Pause watering for 24, 48, or 72 hours to prevent overwatering during rainy periods.
- Compatibilità versatile: Includes adapters for 3/4-inch to 1-inch faucets and 1/2-inch hoses.

Figura 2.1: dettagliata view of the control panel with 'How Often', 'How Long', and 'Manual Irrigation/Rain Delay' dials.
3. Configurazione e installazione
Follow these steps to set up your RESTMO Sprinkler Timer:
- Installazione della batteria: The timer requires two AA alkaline batteries (not included). Locate the battery compartment on the back of the unit, open it, insert the batteries according to the polarity indicators, and close the compartment securely.
- Connetti al rubinetto: Attach the timer to your outdoor faucet. The timer comes with an adapter that fits 3/4-inch to 1-inch faucets. Ensure a tight, leak-free connection.
- Collegare il tubo: Attach your 1/2-inch garden hose to the outlet of the timer using the provided male connector. Tighten securely to prevent leaks.

Figura 3.1: Esploso view diagram illustrating the timer's components and connection points.

Figure 3.2: The timer connected to a faucet and hose, ready for use.
4. Istruzioni per l'uso
The RESTMO Sprinkler Timer features three intuitive dials for easy operation:
4.1. Irrigazione automatica
Per impostare un programma di irrigazione automatica:
- Imposta la frequenza di irrigazione: Turn the 'HOW OFTEN' dial to select how frequently you want to water. Options range from 1 hour to 1 week.
- Imposta la durata dell'irrigazione: Turn the 'HOW LONG' dial to select the duration of each watering session. Options range from 1 minute to 90 minutes.
The automatic watering schedule will begin immediately after setting both dials. The timer will repeat the cycle based on your chosen frequency and duration.

Figure 4.1: Setting automatic watering frequency and duration.
4.2. Irrigazione manuale
To initiate manual watering without affecting your programmed schedule:
- Turn the 'MANUAL IRRIGATION' dial to the desired manual watering time (e.g., 5, 10, 15 minutes).
Manual watering will start immediately and run for the selected duration. Once completed, the timer will revert to its pre-set automatic program.
4.3. Ritardo per pioggia
To pause watering during rainy periods and prevent overwatering:
- Turn the 'RAIN DELAY' dial to select the desired delay period: 24, 48, or 72 hours.
The timer will pause for the selected duration and then resume its automatic schedule. To cancel a rain delay, turn the dial back to 'OFF' or 'RESET'.

Figure 4.2: Visual representation of manual watering and rain delay in action.
5. Manutenzione
Proper maintenance ensures the longevity and optimal performance of your sprinkler timer:
- Sostituzione della batteria: Replace batteries when the battery indicator on the control panel shows low power. Always use fresh AA alkaline batteries.
- Pulizia: Pulire periodicamente l'esterno del timer con un panno morbido eamp panno. Non utilizzare detergenti abrasivi né immergere l'unità in acqua.
- winterization: Before the first frost, disconnect the timer from the faucet and hose. Drain any remaining water from the unit and store it indoors in a dry, protected area to prevent damage from freezing temperatures.
- Controllare le connessioni: Regularly inspect all connections for leaks and ensure they are tight.
6. Risoluzione Dei Problemi
If you encounter issues with your RESTMO Sprinkler Timer, refer to the following common problems and solutions:
| Problema | Possibile causa | Soluzione |
|---|---|---|
| Il timer non irriga | Low or dead batteries; Faucet turned off; Incorrect program settings; Rain delay active. | Replace batteries; Ensure faucet is fully open; Check 'HOW OFTEN' and 'HOW LONG' settings; Turn 'RAIN DELAY' dial to OFF/RESET. |
| Perdita d'acqua dai collegamenti | Loose connections; Worn out washer. | Tighten all connections; Replace the rubber washer inside the connector if damaged. |
| Timer not responding to dial turns | Batteries are completely drained; Internal mechanical issue. | Sostituire le batterie. Se il problema persiste, contattare l'assistenza clienti. |
7. Specifiche
| Caratteristica | Specificazione |
|---|---|
| Numero di modello | O-HT-4A3-GN |
| Marca | Restmo |
| Colore | Verde |
| Dimensioni del prodotto (circa) | 15.8 x 12 x 7.4 cm (6.2 x 4.7 x 2.9 pollici) |
| Peso | 330 g (0.73 libbre) |
| Fonte di alimentazione | 2 batterie alcaline AA (non incluse) |
| Watering Duration Settings | 1, 3, 5, 10, 15, 20, 30, 45, 60, 75, 90 minuti |
| Watering Frequency Settings | 1, 2, 3, 4, 6, 8, 12, 24, 48, 72 hours, or 1 week |
| Rain Delay Settings | 24, 48, 72 ore |
| Filettatura ingresso / uscita | 3/4" BSP |
| Pressione di esercizio | 8-120 PSI (0.5-8 bar) |
| Portata massima | 10 GPM (35 L / min) |
| Temperatura di esercizio | 3-50°C (38-120°F) |
| Grado di impermeabilità | Grado di protezione IP54 |
8. Garanzia e supporto
RESTMO products are designed for reliability and durability. While specific warranty details may vary by region, RESTMO is committed to customer satisfaction and offers support for its products. For any questions, technical assistance, or warranty claims, please contact RESTMO customer support through the retailer where you purchased the product or visit the official RESTMO websito per le informazioni di contatto.
Conservare la prova d'acquisto per eventuali domande relative alla garanzia.
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.