NW-4 Rooftop HVAC Unit

The NW-4 came from a desire to produce a rooftop unit that fit certain unique passenger car space requirements on the roof of a particular car design, with it and other rooftop systems hidden by cowling on the completed car. Soon afterward several other customers decided the unit fit their unique passenger car rooftop air conditioning needs as well, and today these units have joined the ranks of our regular product line. Among other features, the unit is designed to provide air into a duct running the length of the car, rather than crosswise as most railway rooftop units do. This allowed certain heritage passenger cars to have rooftop air conditioning systems without extensive rebuilding of the duct work.

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 at the required temperature.

• 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.

As installed on this railroad business car, the NW-4 is covered by venting, cowling, and other roof equipment making it not just unobtrusive, but nearly invisible.

Related Railway Air Conditioning Products:

• For those wanting an under-car mounted unit, we have built the NW-2 HVAC unit.

• Converting and upgrading most railroad passenger car air conditioning systems may be accomplished with our NW-100-CN series condensers and NW-BEOH-C evaporator packages.

• Our electrical locker packages are designed to meet a number of different needs, including provide heating and air conditioning control.

• We have built a number of custom HVAC equipment to meet special railroad passenger car air conditioning needs.