This page explains the therapy schematic titled Air + Hydro + Hydro Foot + Microbubble Therapy + Heated Seat & Back with Digital Controller, published by Ella's Bubbles for the Transfer60, TransferXXL and Ultimate walk-in tubs. It is the fullest single-seat equipment stack drawn on one sheet, and it is the digital-controller counterpart to the push-control diagram of the same package. The information below is taken from the schematic PDF, which prints the revision date 01-21-26, and it covers the model list, the ten numbered components, the wiring of the digital controller, the relay switches, and the electrical requirements exactly as printed.

The Fullest Single-Seat Stack on One Diagram

No other single-bather Ella schematic carries more equipment. This one shows two hydro pumps (seat and foot), an air pump, the optional microbubble water pump with its pressure tank, the in-line water heater, the surface heater pads for the heated seat and back, the ozone generator and the LED chromatherapy light. All of it runs on two dedicated GFCI protected 20 amp, 120 volt lines. If you are comparing therapy packages, this sheet is a good way to see how the pieces fit together before anything is ordered, and it is the sheet to keep handy after installation when a single therapy needs attention.

Which Tubs It Lists

The sheet lists Transfer60, XXL and Ultimate. XXL is the TransferXXL. The 60-inch-long Transfer60 and the 36-inch-wide TransferXXL are the two largest members of the wheelchair-accessible Transfer family, and the Ultimate is the 60-inch member of the stainless-steel inward-swing door family. Model pages: Transfer60 profile and Ultimate profile.

The Ten Numbered Components

1. Air Massage System. Refer to the technical drawing for jet count; variable speed pump with auto purge; ON/OFF push button.
2. Seat Hydro Massage System. Hydro pump; hydro massage air flow intensity control; ON/OFF push button.
3. Foot Hydro Massage System. Hydro pump; hydro massage air flow intensity control; ON/OFF button.
4. Infusion Microbubbles (Micro Bubble Therapy System). Microbubble pump; pressure vessel; ON/OFF button. Optional package with its own push control.
5. LED Light. Chromatherapy.
6. In-Line Water Heater. Master Control Box.
7. Electronic Component Controller. Master Box.
8. Ozone Generator. Ozone sanitation system.
9. Surface Heater Pads. Heater pads.
10. Surface Key Pad. ON/OFF push button, labeled Heat Keypad.

The legend is nearly identical to the push-control sheet for the same package, and the printed wording for items 1 and 2 still reads "ON/OFF push button." What sets this version apart is the digital controller drawn on the diagram itself, described in the next section. The foot hydro massage keeps its physical ON/OFF button, the microbubble option keeps its own push control, and the heated seat keeps its own Heat Keypad on both versions.

Digital Controller and LED Wired to the Master Control Box

On this sheet the digital controller and the LED light are both drawn wired into the master control box, the Electronic Component Controller (component 7). The in-line water heater is wired through the same box, and two outputs, Load 1 and Load 2, leave it to feed the system.

For a customer, the practical difference from the push-control version is simply where you touch to start a therapy. On a digital controller you use the touchpad, with the bubble button and the plus and minus keys to move through the air speeds; on push controls you press the Air button once for high, twice for medium, three times for low and a fourth time to turn the air off. The push controls versus digital touchpad page compares the two.

Relay Switches on Microbubble, Heater and Foot Circuits

The diagram draws relay switches on three circuits: the microbubble circuit, the heater circuit and the foot circuit. A relay is what lets a low-power control, like the touchpad or a push button, switch a pump or heater that draws far more current. The microbubble path is drawn as water in, then the water pump, then the MicroBubbles pressure tank, then out to the jet. The seat and foot hydro pumps each have their own intensity dial.

This is useful during a service call. If one therapy is silent while the rest work, the relay and the control for that one circuit are the natural place to start, and you will find these boxes behind the removable front apron. The cords, control boxes and connections page shows what to expect there.

Electrical Printed on the Diagram

Two dedicated 20 amp GFCI lines carry the whole stack on these three models. Individual pump and heater ratings are on each model's specification sheet rather than the schematic, and pump amperage can change with availability, so confirm with the team at (800) 480-6850 if your electrician needs an exact figure. The electrical requirements by model page summarizes the lineup.

Push Versus Digital Variants of the Same Stack

Ella's Bubbles publishes this package twice: the push-control sheet (revision 08-01-26) and this digital-controller sheet (revision 01-21-26). Both list Transfer60, TransferXXL and Ultimate. Both have ten numbered components, two dedicated 20 amp GFCI outlets and an air pump at 110-120 V, 4.5 A. The difference is the control layer: a digital controller wired to the master box on this sheet, push buttons on the deck on the other. The heated seat and back is the same on both, electric Surface Heater Pads switched at the Heat Keypad, and separate from the in-line water heater. The heated seat and backrest page covers that option in detail.

Download the official document: Air + Hydro + Hydro Foot + Microbubble + Heated Seat & Back schematic with Digital Controller (Transfer60, TransferXXL, Ultimate)

Common Questions