Trane CAB-PRC001-EN manual Electric Heat, General Data

General Data Electric Heat

Electric Heat

All Force-Flo™ cabinet heaters, except inverted models M and N, are available with electric heating coils as a standard option.

Coil Construction

Electric heat coils are open wire type with a nickel chromium element design.

Power Supply

Units have single-point power since the electric heating elements operate on line voltage. Electric heat is available as 208/60/1, 230/60/1, 277/60/1, 208/60/3, or 480/60/3. Electric heat coils operate on the same voltage as the unit, except for units with 480/60/3 electric heat. In this case, the unit operates at 277/60/1, thus requiring a 4-wire supply. All fans and motors are single phase. In addition, all control options are 24-volt, utilizing a factory- installed transformer.

Power Supply Location

All electric heat cabinet heaters have a terminal block for main power on the unit’s right-hand side.

Control Type

Single-stage electric heat units are controlled by any of the Tracer® ZN control options. Two-stage electric heat is controlled by the Tracer ZN.520 only. Both

control options use PWM (pulse-width modulation) outputs to calculate the electric heat output based on the capacity request and the electric heat cycles per hour. For example, if the electric heat cycles per hour is configured for six cycles (as Trane recommends) the controller bases the output on or off time on six 10-minute periods. If the capacity request is 40%, the controller controls the electric heat output on for approximately four minutes each period.

Safety Features

•All Force-Flo units with standard electric heat are UL listed.

•Units require only a single-point electrical connection.

•All electric heating coils are interlocked with the fan motor switch. Therefore, electric heat operation is only possible when the fan is running.

•Each unit has a transformer, eliminating the need for field installation of a step- down transformer.

•A unit mounted magnetic contactor(s) is (are) supplied on all unit voltages.

•A high temperature cutout with auto- matic reset de-energizes the electric heat in the event of an overheat condi- tion.

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