Understanding the ThermoTech TT91: Managing Heat and Performance

8. Wiring Summary

• Input: 3-Phase power (L1, L2, L3, N, PE).
• Output: Terminals for Heater Load, Light, and Fan.
• Control: Terminals for the remote control panel cable and sensor leads.

Do not use the unit outdoors or in high-humidity areas, and keep it away from flammable or explosive gases.

Heat Pump Mode (O/B terminal):

If your TT91 has a heat pump, the manual specifies that the O/B terminal must be configured for energizing in cooling (O) or heating (B).