Trane LO manual Condensate Overflow Detection Device, Automatic Changeover Sensor, UNT-IOM-6

Condensate

Overflow

Detection Device

inch inside diameter flexible plastic tube over the nipple and secure with a field supplied hose clamp.

Note: The installer is responsible for adequately insulating field piping. See the “External Insulating Requirements section on page 20 for more information.

The condensate overflow detection device is an option on fan-coil units with either a Tracer® ZN.010, ZN.510, ZN.520 or TUC control. The float switch, mounting bracket, and coiled leads ship attached inside the piping end pocket of the unit. Install the switch by placing the hole or slot in the bracket over the condensate overflow drain (of the auxiliary drain pan) with the switch float extending over the pan. Secure the drain pan by attaching the pan’s bracket with the factory provided clip. See Figures 12 and 13.

Figure 12. Condensate overflow switch installed in a vertical auxiliary drain pan.

Figure 13. Condensate overflow switch installed in a horizontal auxiliary drain pan.

Automatic

Changeover

Sensor

Two-pipe changeover units with either the Tracer® ZN.010, ZN.510, ZN.520 or TUC control have an automatic changeover sensor that determines heating or cooling mode based on the supply water temperature. On units with a factory piping package, the factory straps the changeover sensor to the piping supply water pipe. See Figure 14 on page 27.

If the unit does not have a factory piping package, the factory at- taches the sensor and coiled lead wires to the piping side end panel. The installer should attach the sensor parallel to and in direct contact with the supply water pipe.

Note: The installer is responsible to ensure the changeover sensor is installed in a location that can sense active water temperature. Otherwise, the unit may fail to sense the correct operating mode and disable temperature control.

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