NW-603-INT HVAC Control
Replacement for older Amtrak passenger car HVAC controls by Northwest Rail Electric
Phone: (503) 231-4808 Fax: (503) 230-0572 E-mail
See where our equipment is located on a typical passenger car
When passenger railroads started converting to head-end power, a series of passenger car HVAC controls were developed to work with the heaing, venting and air conditioning systems then being put on the passenger cars. Today, the HVAC systems are, in many cases, still operable, but the HVAC control systems leave a lot to be desired when operated today.
Most of these systems depended on seven or more thermostats in order to determine how the HVAC system should respond to the temperature inside the car. The systems typically ran both the heat and the air conditioning at the same time, with the temperature and humidity being maintained by the systems fighting eachother. In modern HVAC systems, the heat and the air conditioning may run at the same time to gain dehumidification, but not to the excessive extent that these older control systems do.
Therefore, due to customer demand for a replacement for these systems, Northwest Rail Electric developed the NW-603-INT system.
The Northwest Rail Electric version of the system consists of two major components:
The Interface Box
The interface box is slightly smaller than the original control box. This allows it to be installed in the same location as the original box. The box is equipped with the same multiple-pin connector as the original box, allowing it to simply plug into the existing system.
The Temperature Control Strip
The temperature control strip is equipped with two stages of heat control, two stages of air conditioning control, and dehumidification, plus temperature display. There is a control voltage circuit breaker, emergency cooling switch, and a HVAC on-off switch. The control strip may be mounted anywhere desired, and does not have to be immediately next to the interface box. This allows the control and display to be on the electrical locker door or other more convenient location than inside the electrical locker itself. The panel is designed to mount in a 19 inch rack, but brackets are available to mount it to a number of different electrical locker situations.
System Features:
- System start-up timer. This is a customer-adjustable timer that causes a delay between when the power is first received and the HVAC system first starting up. This prevents overloading of the generator if there are a number of cars with the HVAC systems turned on when the HEP power comes on.
- Heat Staging Timers
- Indicators on the cover of the interface box that indicate both the state of the Temperature Control and what signals are being received at the box, as well as the state of the contactors on the HVAC unit itself. This allows for easier system troubleshooting.
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