Railcar Cab Heaters & Demisters
Three typical cab heater designs are shown below, all with covers removed for clarity. Indeeco designs and fabricates the heating elements, sheet metal enclosures and internal wiring.
These in-house capabilities are unique in the cab heater field. All units are tested after assembly under full power.
A dual inlet centrifugal blower forces air over two tubular elements for two stage heating. An automatic reset thermal cutout mounted in the top left portion of the enclosure provides over-temperature protection. The heater element can be designed for full line voltage or low voltage operation. The fan operates at 24 volts.
Terminal blocks are furnished for both power and low voltage control. Built-in relays are available, but in Figure 12 they were remotely mounted.
Two of the four outlets are connected to hoses for demisting thewindshield. The other two warm the cab.
Under-Seat Cab Heater
A single inlet centrifugal blower forces air over the tubular elements. Two levels of thermal protection are provided: An automatic reset thermal cutout acts as the primary protector. A manual reset thermal cutout furnishes backup protection.
In this design, both fan and heaters operate at 230 volts AC. A starter capacitor is mounted on the left side of the blower motor. Solid state relays behind the motor are provided for heater operation.
Power and control connections are made through the two bushings in the top of the cabinet. Multi-pin connectors are also available.
Multi-Stage Cab Heater
Built to operate from a 230 volt, 3 phase power source, this heater features a fiveposition selector switch for three heating stages, a fan only setting and "power-off." A three-speed fan, keyed to the heating stages, keeps the outlet air temperature relatively constant.
Two levels of thermal protection are provided: An automatic reset thermal cutout acts as the primary protector. A manual reset thermal cutout provides backup protection.
A single multi-pin connector for power and control wiring was provided, along with two nozzles to demist the windshield and a third (not shown) to warm the cab area.