Thermospa Wiring Diagram. They usually operate at 24v ac power and the source of this control. The thermostat uses 1 wire to control each of your hvac systems primary functions such as heating cooling fan etc.
The e book features a lot of practical. The white wire connects to your heat. It shows how the electrical wires are interconnected and will also show where fixtures and components could be coupled to the system.
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The rh wire connects to the heating system. The basic heat ac system thermostat typically utilizes only 5 terminals. Thermospas has been manufacturing spas since 1983. One is for cool and the other is for heat hence the abbreviation rh and rc.