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Auto Panel Technical Page

 

rainman watermakers logo

 

Rainman Technology Pty Ltd
49 Orchard Road
Brookvale, NSW 2100
Australia

www.rainmandesal.com

support@rainmandesal.com


Overview

The main control module inside the Rainman Auto Control Panel manages all system logic, safety interlocks, and operational sequencing. This guide outlines how to access the enclosure, replace power supply fuses, perform firmware updates and helps to understand the wiring layout.

Pressure Sensor Replacement

In rare cases where either pressure sensor provides false readings to the main controller, the affected sensor must be replaced. Both the high-pressure and low-pressure sensors can be replaced without accessing deeper electronic components. Until replacement is available, the system may continue to operate in manual override mode.

 

  1. In order to replace either pressure sensor, first the wiring needs to be disconnected. Unplug the connector by lifting the lock mechanism and pulling connector straight out.
    Same applies for both, high-pressure and low-pressure sensors
  1. Removing high pressure sensor will require adjustable wrench and a 22mm spanner.
    Undo it by holding the manifold as in the photo and untightened the sensor.
  2. Low pressure sensor is only held in place by push-to-connect fitting. Disconnect it by pressing the metal collar into the fitting and gently pulling the sensor straight out.

Accessing Controller

Apart from the two pressure sensors described above, all other components require direct access to the controller module. The following steps outline the procedure for removing the enclosure and accessing the controller.

Opening the Enclosure

  1. Disconnect power before beginning any work.
  2. Remove the four Phillips pan‑head screws located at the corners of the enclosure as shown in the picture.
  3. Lift the front cover straight off to expose the internal components.

Fuse

The controller module circuitry is protected by two separate fuses, which may fail under conditions such as external voltage spikes or a mechanically jammed pressure valve motor continuously attempting to operate.

The fuse located on the left side of the controller protects the sensor electronics. It is a fast‑acting 400 mA glass fuse. The fuse on the right side of the controller protects the circuitry against supply voltage spikes and overload. It is a slow‑blow (time‑delay) 4 A glass fuse.

Info Screen

All operating parameters available through the phone application can also be viewed on the controller’s integrated information display. This provides a useful alternative during fault troubleshooting when use of the phone application is impractical.

Wiring Diagram

The following image provides a clear comparison between the physical controller board and its corresponding wiring diagram. The wiring diagram illustrates the electrical connections and pinouts for each terminal, helping you understand how to properly connect and troubleshoot the system.

Replace Flow Sensor

The Rainman Auto Control Panel incorporates two turbine‑type digital flow meters. While these meters are highly robust and perform reliably under normal operating conditions, their accuracy can gradually decline over years of use, particularly after repeated winterizing and commissioning cycles. Because they are relatively inexpensive components, replacing them once a noticeable loss of accuracy occurs is a practical and cost‑effective solution.

Instructional Video

A full walkthrough video is available on our YouTube channel:

Board Replacement Instructions

Follow these steps to safely replace the main controller board:

Remove old Board

  1. Early panels may not have labeled wires. Make sure you name each connector before disconnecting. Carefully unplug the 15 connectors attached to the existing controller board. 
    Note: Avoid pulling on the wires directly — grip the connector body to prevent damage.
  1. Gently detach the antenna from the board, pulling straight upwards.
    The antenna connector is sensitive for force applied sideways.
  1. Locate and remove the screws securing the controller board using a small Phillips screwdriver.
    Typically, there will be 5 screws securing the board, confirm all are removed before lifting the board.

Install new Board

  1. Position the new board in place, aligning it with the mounting holes.

    Reinstall and tighten the screws evenly — do not overtighten.

    Reconnect the antenna carefully.

    Reconnect all labeled wires and connectors, ensuring each one clicks or seats firmly.