spa parts, hot tub parts and repair help
spa parts, hot tub parts and repair help
spa parts, hot tub parts and service help
spa parts, hot tub parts and repair help
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Spa System Diagrams,
A Spa Techs System
Diagrams Index

Safety Warnings!
Remove Power from the spa/hot tub BEFORE working on your equipment.  Failure to comply with this requirement, can lead to electrical shock and/or electrocution!

The instructions here are intended for general reference only.  Many systems are different from the one that is depicted here, and may require more technical knowledge than what is displayed.

An inexpensive spa and hot tub control system

This is a diagram of a complete self-contained spa control system. 
It does not represent any particular brand of system, it is a basic "home-brew" type of controller, built from easily available components.

This design provides for:

  • Thermostat activation of low speed pump and heater.
  • High temperature protection, shuts down the entire system.
  • Pressure switch protection for the heater.
  • Fully adjustable, timed filtration.
  • Single air button control, using the Pres:Air:Trol MTG-311A sequential air switch.

Parts Requirements:
  • 1, MTG-311A Air Switch.
  • 1, T9 style, (or other), 115V, Single pole relay.
  • 2, T92 115V 30 amp relays.
  • 1, Standard Capillary thermostat.
  • 1, Standard Capillary high limit switch.
  • 1, Standard Pressure or Flow switch.
  • 1, Timer, 115V. (Optional).
  • 2, Fuses and holders.
  • Wiring, box, other miscellaneous items as needed.

Read the site disclaimer

It is not recommended that you attempt to build this unit unless you have engineering knowledge of electrical systems, and the safety requirements associated with devices of this type.


Metro Atlanta Spa/Hot Tub Service
spa parts, hot tub parts and service Spa and Hot Tub Parts and Service

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