1. Introducció
This manual provides detailed instructions for the installation, operation, and maintenance of your WASSERMANN 3WDP4-45-12V RV Water Pressure Pump. Designed for reliable water supply in RVs, marine vessels, camping setups, yachts, and garden applications, this self-priming 12V DC pump delivers a strong output of up to 4.0 GPM at 45 PSI. Please read this manual thoroughly before use to ensure proper function and longevity of the product.
2. Informació de seguretat
- Seguretat elèctrica: Ensure the power source is 12V DC. Disconnect power before performing any installation, maintenance, or troubleshooting. All electrical connections should be secure and protected from moisture.
- Qualitat de l'aigua: This pump is designed for pumping clean water only. Pumping abrasive liquids, flammable liquids, or liquids containing large debris can damage the pump and void the warranty.
- Instal·lació: Mount the pump in a dry, well-ventilated area. Ensure adequate space for air circulation around the motor. Avoid mounting in direct sunlight or areas exposed to extreme temperatures.
- Pressió: The pump operates with a pressure switch. Do not exceed the maximum operating pressure of 45 PSI.
- Córrer en sec: The pump is designed to allow dry running for short periods, but prolonged dry running should be avoided to prevent overheating and damage.
3. Contingut del paquet
Verifiqueu que tots els elements siguin presents al paquet:
- 1 x WASSERMANN 12V RV Water Pressure Pump (Model: 3WDP4-45-12V)
- 2 x 1/2" Barbed Hose Adaptors
- 1 x 1/2" Male Thread Hose Adaptor
- 1 x Filter Out Debris Strainer
- Manual d'usuari (aquest document)

Image 3.1: WASSERMANN 3WDP4-45-12V RV Water Pressure Pump with included adaptors and strainer.
4. Especificacions
| Característica | Especificació |
|---|---|
| Marca | WASERMANN |
| Model | 3WDP4-45-12V |
| Voltage | 12 Volts DC |
| Caudal màxim | 4 galons per minut (GPM) |
| Configuració de la pressió | 45 PSI (Automatic Pressure Switch) |
| Alçada màxima d'elevació | 98 peus |
| Self-priming Vertical Lift | Fins a 6.5 peus |
| Dimensions del producte (L x A x A) | 8.15" x 5.12" x 4.86" |
| Pes de l'article | 4.17 lliures |
| Motor | 12V DC Core Motor, Pure Copper Windings |
| Material de construcció | Thermoplastic Housing, Santoprene Diaphragm, EPDM/Viton Valves/Seals |
| Nivell de soroll | Aproximadament 45 dB |

Image 4.1: Detailed dimensions of the pump and various adapter types.

Imatge 4.2: acabatview of durable materials and components used in the pump's construction.
5. Configuració i instal·lació
Follow these steps for proper installation of your WASSERMANN RV Water Pressure Pump:
- Muntatge: Secure the pump to a solid, flat surface using appropriate fasteners. The rubber base helps reduce vibration and noise. Ensure the pump is mounted in a location that allows for easy access for maintenance and inspection.
- Strainer Installation: Firmly tighten the included 50-mesh strainer to the pump's inlet port (1/2" NPTF). This prevents debris from entering and damaging the pump.
- Connexió de la mànega: Install the appropriate barbed hose adapter (1/2" NPTM) onto the pump's threaded ports. Connect your water inlet hose to the strainer side and the outlet hose to the other port. Use hose clamps to secure all connections to prevent leaks.
- Connexió d'alimentació: Connect the pump to a 12V DC power source. The red wire is positive (+), and the black wire is negative (-). Ensure correct polarity. The pump can be powered by a 12V battery or connected to a cigarette lighter socket in an RV/camper (adapter not included).
- Cebament: The pump is self-priming. Once all connections are secure and the power is supplied, open a faucet in your water system to allow air to escape. The pump will draw water and prime itself.

Image 5.1: Step-by-step guide for connecting the strainer, adapters, and hoses to the pump.

Imatge 5.2: Ex.ample diagram of the pump providing fresh water to an RV's shower, toilet, and sink.

Image 5.3: Powering options for the pump, including direct battery connection and cigarette lighter adapter (not included).
6. Funcionament
The WASSERMANN 3WDP4-45-12V pump features an automatic pressure switch for convenient operation:
- Funcionament automàtic: The pump will automatically start when a tap or fixture is opened, causing a drop in system pressure. It will stop when all taps are closed and the system pressure reaches 45 PSI.
- Ajust de pressió: The pump's pressure switch is factory-set to 45 PSI. If adjustment is needed, carefully follow these steps:
- Desconnecteu l'alimentació de la bomba.
- Unscrew the screws on the upper cover of the pressure switch.
- Use a small flat-head screwdriver to adjust the pressure regulator needle. Turning clockwise increases the pressure, and turning counter-clockwise decreases it. Make small adjustments and test the pump's operation.
- Replace the cover and secure the screws.

Image 6.1: Instructions for adjusting the pump's pressure switch.
7. Manteniment
Un manteniment regular garanteix un rendiment òptim i allarga la vida útil de la bomba:
- Neteja del colador: Periodically inspect and clean the inlet strainer to prevent blockages. Unscrew the clear housing, remove the mesh filter, rinse it with clean water, and reassemble.
- Neteja general: Keep the exterior of the pump clean and free from dirt and debris. Do not use harsh chemicals or abrasive cleaners.
- Hivernització: In freezing temperatures, drain all water from the pump and plumbing system to prevent damage from ice expansion. Disconnect hoses and run the pump briefly (less than 30 seconds) to expel any remaining water. Store in a dry, frost-free environment.
- Comprovacions de connexió: Regularly check all hose connections and electrical wiring for leaks, corrosion, or damage. Tighten connections as needed.

Image 7.1: Disassembly and cleaning of the 50-mesh stainless steel inlet strainer.
8. Solució De Problemes
Consulteu la taula següent per veure els problemes habituals i les seves solucions:
| Problema | Causa possible | Solució |
|---|---|---|
| La bomba no arrenca | No power, incorrect wiring, blown fuse/breaker, pressure switch fault. | Check power supply, verify wiring polarity, inspect fuse/breaker, check pressure switch connections. |
| Sense flux d'aigua o baixa pressió | Clogged strainer, air in system, kinked hose, low water supply, internal blockage, red caps in inlet/outlet. | Clean strainer, bleed air from system by opening faucets, check hoses for kinks, ensure adequate water supply, inspect for internal blockages, verify and remove any red protective caps from inlet/outlet ports before connecting hoses. |
| Pump runs continuously (cycles on/off rapidly) | Leak in plumbing system, faulty pressure switch, air in system. | Check all connections and fixtures for leaks, inspect pressure switch, bleed air from system. |
| Excés de soroll/vibració | Loose mounting, air in system, debris in pump, worn components. | Ensure pump is securely mounted, bleed air from system, clean strainer, inspect pump for internal debris. |
9. Garantia i Suport
For warranty information, please refer to the documentation provided with your purchase or contact WASSERMANN customer support directly. Keep your proof of purchase for warranty claims.
If you encounter issues not covered in this manual or require further assistance, please contact WASSERMANN customer service through their official weblloc web o el venedor on es va comprar el producte.