Load
Schenker ZEN 50 Watermaker wiring diagram
ZEN 50 version 50Z12: 12 V watermaker, nominal 50 L/h at stated seawater conditions. The manual specifies 250 W continuous, 400 W peak and a 32 A supply breaker. Controller, flushing valve and hydraulic installation are separate from the drawn power pair.
- Compatible systems
- 12 V
- Continuous draw
- 20.8 A
- Surge current
- 33.3 A
Wiring diagram
How the ZEN 50 watermaker is wired.
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Cable sizing for this example
Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.
3 m one way
12 V system
- Wire
- 10 mm² · 8 AWG
- Example fuse
- 30 A
- Design current
- 20.8 A
- Voltage drop
- 1.9%
Sized against ABYC E-11. The design current is the part's continuous draw. The length is one way; voltage drop includes an equal-length return.
Run-length and manufacturer assumptions
The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.
Supporting parts
- 6.1 m total of 10 mm² (8 AWG) marine cable
- Terminations for 10 mm² cable, matched to the equipment's screw terminals, leads or studs
- 30 A fuse and holder on the positive run
- Heat-shrink, strain relief and terminal boots sized to the cable
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Installation notes
Before you install.
Open a question for model-specific guidance and sources.
Verified against the manufacturer's documentation (rev. COD.50Z12/24.B.2018), checked 2026-10-01. Manufacturer documentation →
Use the 12 V version
This entry represents ZEN 50 version 50Z12. The manual also covers 50Z24, which has different supply wiring and protection. The 12 V version permits ±15% supply variation. Its electrical installation section specifies 250 W continuous and 400 W peak; at nominal 12 V these correspond to about 20.8 A and 33.3 A. Production is nominally 50 L/h ±20% at 25°C seawater and 35,000 ppm salinity, not a guarantee in all conditions.
Power and control connections
Connect `+` and `−` to the battery supply clamps on the control-box board, not directly to the remote-panel connections. The manual specifies a 32 A automatic circuit breaker for 12 V, versus 16 A for 24 V. Its 12 V cable table gives 10 mm² up to 3 m, 16 mm² for 3–7 m and 25 mm² for 7–10 m; confirm how the actual route relates to the stated lengths and check installation derating.
Keep auxiliary circuits distinct
The EV terminals feed the flushing electrovalve; A/B/12/− serve the remote panel. These and the controller’s 400 mA fuse are separate from the main 32 A supply protection. The emergency microswitches must be off during normal operation. The diagram’s 35 A terminal ceiling is a rounded modeling envelope above the nominal peak, not a manufacturer connector-ampacity claim.
Start, flush and monitor
Follow the first-start purge procedure after installation, filter replacement or cleaning. Confirm inlet and discharge valves, cartridges and fresh-water flushing supply. Normal indicated working pressure is 7–8 bar; inspect for leaks at each start and investigate abnormal pressure. Use the prescribed flushing shutdown and storage treatment for long idle periods. The drawing omits pumps, hydraulic energy recovery, filters, valves and water-quality controls, so it cannot certify potable output or correct plumbing.
Source: manufacturer document — performance printed/PDF p. 12; electrical wiring p. 28; controller schematic p. 29; startup/flush pp. 30–32; operating checks p. 38.
Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
ZEN 50 version 50Z12: 12 V watermaker, nominal 50 L/h at stated seawater conditions. The manual specifies 250 W continuous, 400 W peak and a 32 A supply breaker. Controller, flushing valve and hydraulic installation are separate from the drawn power pair.
- Compatible systems
- 12 V
- Continuous draw
- 20.8 A
- Surge current
- 33.3 A
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
+
positive · input
−
negative · input
Sources and sizing method
Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.
Example sizing. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Results use the example current and run length shown above. Set your actual equipment, lengths and installation conditions in Crimp before choosing hardware.
Read how the sizing worksNext step
Plan your installation with ZEN 50 watermaker.
Open this example as a new project, or add this component to your existing diagram. Use your equipment and cable lengths to review the sizing.
Start drawing, sizing and checking without an account. Your drawing saves in this browser. See Pricing for the equipment allowance and the one-time export offer available to you.