NW-4 Rooftop HVAC Unit

The NW-4 came from a desire to produce a rooftop unit that fit within a certain vertical space on the roof of the car.

Features include:

• Incoming Voltage normally 480v 3 phase - the standard HEP voltage. No need for added transformer capacity. (Units operating on other voltages are possible if desired by the customer.)

• Up to 11 tons of cooling capacity and 24 kW of heat.

• 3 stages of air conditioning and 2 stages of overhead heat allow the system to only use the energy required to keep the interior of the car cool.

• 3 speed evaporator fans save energy by only consuming the required energy, and reduces interior noise over single speed systems. This also increases passenger comfort over single speed systems, as high speed air movement is only allowed to happen when it is required to provide the needed capacity.

• System is designed to have variable speed condenser fans, so that exterior noise and energy consumption is reduced over single speed fans.

• "Fail Safe" design provides limited cooling capacity even if there is a partial system failure.

• Hermitically sealed system and compressors.

• Compressors have been used in a number of passenger car rebuilds in North America, and on new equipment in Europe.

An NW-4 system as built and ready for shipment.

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