Roof mounted modular train coach air conditioning system (HVAC) to supply 20kW cooling and 7kW of heating, to ensure a cabin temperature of 20°C-25°C max in a 45°C ambient, provided the coach is thermally insulated. The HVAC system is a double evaporator design with dual compressors (8kW and 12kW) for redundancy and capacity control. The system is available with reverse cycle heating, where the 8kW circuit is reversed to produce 9kW of heating.

The HVAC system does not restrict the standard operational features of any coach type and stays within the standard gauge set. The HVAC unit is protected with a sheet metal cover which matches the style and colour of the coach. Depending on the capacity requirements, two rooftop HVAC units can be installed per coach (one on each end).

All electrical switchgear and control components are housed in the control panel installed in the electrical control room of the coach, and no electrical parts are housed in the rooftop unit. This means that faults can be determined without needing access to the rooftop unit.

All electrical connections, looms and the electronic control panel, as well as electrical control gear, are designed and selected for operation in railway environments, which include adverse temperatures as well as severe shock and vibration which conforms to EN 61373.

The HVAC unit is equipped with custom-designed electronic controllers, capable of all control and safety functions. The touch screen controller activates subsystems as required to regulate the cabin temperature to the desired setting on the control panel (HMI). The system has a Bluetooth login interface for remote monitoring via a smartphone app and/or laptop.

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