What the LayDown Microbubble Schematic Shows: Air Switch, Relay, Water Pump, Pressure Tank and One Jet
Updated September 2026
This page explains the Micro Bubble Therapy System component diagram for LayDown tubs, Micro_Lay-down.pdf in the /walk-in-tub/schematics/ folder (revision 7-13-23), and its heated seat companion lay-down-micro-heat.pdf (Microbubble Therapy + Heated Seat & Back, revision 01-16-26). You will learn what the single component on the plain diagram contains, how the chain runs from the push control through the relay, water pump and pressure tank to the jet, what the outlet block prints, and which families the heated seat variant lists.
An Optional System on One Page
The diagram's legend is headed "Micro Bubble Therapy System (Optional Feature)", and the push control on the drawing is also marked "Optional". Microbubble therapy is an add-on rather than a standard part of a LayDown tub, so not every unit has the pressure tank and pump shown here. If your order paperwork does not list microbubble therapy, this diagram does not apply to your tub. What the therapy does and how it feels in the water is described on the microbubble infusion therapy page, and the tub family itself on the LayDown tub guide.
The Single Component and Its Parts
The legend prints one numbered component:
| Number | Component | Parts listed |
|---|---|---|
| 1 | Micro Bubble Therapy System (Optional Feature) | Microbubble Pump; Pressure Vessel; Air Switch and One (1) Jet |
Two details in that line matter. "Air Switch" means the on/off control is pneumatic: pressing the button sends a puff of air down a hose to a switch, rather than closing an electrical contact at the button. "One (1) Jet" means the microbubbles enter the bath through a single dedicated jet, separate from any air or hydro jets the tub may have.
The Chain from Push Control to Jet
The drawing shows the following sequence:
- The "Infusion Microbubbles Push Control (Optional)" is pressed.
- The push control operates the Relay Switch.
- The Relay Switch starts the Water Pump, tagged "Electrical 110V".
- Water enters at "Water in" and the pump sends it to the MicroBubbles Pressure Tank (the pressure vessel named in the legend).
- From the tank, "Micro Bubbles Out to Jet" returns the water through the single jet into the bath.
The pressure tank sits between the pump and the jet, and the LayDown60 spec sheet describes the same system as an air pressure pump, a pressure tank and an On/Off push control. Because the water pump draws bath water in at "Water in", the system should only run with the tub filled above the jets, as described on the water level before running jets page.
Electrical Printed on the Diagram
The outlet block prints one outlet: "#1 Wall Outlet, GFCI Protected, Dedicated Line, 20 AMP, 120 Volts". The water pump carries an "Electrical 110V" tag, and the page closes with "Please View Specifications for Electrical Amperage (A), Voltage (V) and Wattage (W)". On the LayDown60 spec sheet, the microbubble therapy option is listed as an air pressure pump, a pressure tank and an On/Off push control, which matches the three parts on this diagram.
The Microbubble + Heated Seat Variant and the Models It Prints
lay-down-micro-heat.pdf is titled "Microbubble Therapy + Heated Seat & Back". Despite the lay-down file name, it prints "Available With: Stainless Steel, Outward Door", the stainless steel inward-swing door family and the outward-swing door family. Go by the printed list. Its legend has four components:
| Number | Component | Parts listed |
|---|---|---|
| 1 | Infusion Microbubbles, Micro Bubble Therapy System | Microbubble Pump; Pressure Vessel; ON/OFF Button |
| 2 | Surface Heater Box | Heat Control Box |
| 3 | Surface Heater Pads | Heater Pads |
| 4 | Surface Key Pad | ON/OFF Push Button |
The microbubble chain is drawn the same way: Infusion Microbubbles Push Control, Relay Switch, Water Pump, Water in, MicroBubbles Pressure Tank, Micro Bubbles Out to Jet. Beside it, the Heat Keypad drives the Surface Heater Box, which powers the Surface Heater Pads. The two chains are independent, and the outlet block still prints a single "Wall Outlet, GFCI Protected, Dedicated Line, 20 AMP, 120 Volts". The heated seat option is described on the heated seat and backrest page.
Troubleshooting Order from the Diagram
Because the diagram is a straight line, it doubles as a checklist when the jet produces nothing:
- Confirm the tub is filled above the jets and the dedicated GFCI outlet has power.
- Press the push control and listen for the relay switch to click; if nothing happens, the air switch and its hose are the first suspects.
- If the relay clicks but no pump runs, the water pump is next in line.
- If the pump runs but the jet gives plain water or nothing at all, the pressure tank and the line to the jet are the remaining links.
Work through those steps with the microbubble not producing bubbles page, and if the system is still quiet, contact the team through ellasbubbles.com/support or at (800) 480-6850 with your model, serial number and the point in the chain where things stop.
Download the official document: Micro Bubble Therapy System Component Diagram (Lay-Down)
Related Guides
- Does the LayDown Tub Have a Seat? Flat Bottom Design, Seat Figures on Listings, Faucets and Therapy Choices
- The Crate Label Does Not List the Microbubble Option I Ordered
- Is There a Time Limit on How Long the Microbubble Pump Runs?
- What Is a Bubble Tub and How Does Air Massage Work?
Common Questions
Is microbubble therapy standard on LayDown tubs?
How many jets does the LayDown microbubble system use?
Where does the pressure tank sit in the chain?
How many electrical lines does the LayDown microbubble system need?
Why does lay-down-micro-heat.pdf list Stainless Steel and Outward Door instead of LayDown?
In what order should I check the system if no bubbles come out?
About this guide. Answers in the Ella’s Bubbles Support Center are compiled from real conversations with tub owners, our technicians’ notes and the product documentation, then reviewed by our team. Tub models and options have evolved over the years, so a detail here may differ slightly from your exact tub. If something looks different on yours, send us your serial number and a specialist will confirm it for your model.
Did this solve your question?
If not, open a ticket and our team will pick it up from here.
Open a Support Ticket
Videos