RAILWAY UPDATE
HVAC Heating Ventilation and Air Conditioning
HVAC shall not be manually switched OFF in the non-active cab
HVAC controller
HEATING VENTILATION AND AIR CONDITIONING (HVAC)
5.7.1 GENERAL DESCRIPTION
WAG12 locomotive is equipped with roof mounted heating ventilation and air conditioning unit.
Each cab is equipped with one HVAC Unit. The HVAC units supply conditioned air into ducting
system and the ducts distribute air into the cab through the vents. HVAC ensures comfortable
temperature and humidity inside the cab.
Fresh air enters the HVAC unit through a grille at the side of the unit. It gets mixed with the return

air from the cab, which enters the HVAC unit through the air inlets located under the HVAC unit.
The mixed air is cooled/heated and then blown into the ducting system of the cab.
Each HVAC unit comprises of the following main components:
• One condenser
• One condenser fan and motor set to draw air over the condenser
• One evaporator used to cool the mixed supply air
• One evaporator fan and motor set to draw air over the evaporator

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