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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.
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