Marvair Exterior Wall Mounted Cooling Unit

The Marvair® CoolLinks™ HVAC Controller 

CoolLinks controller sequences the operation of the two HVAC units 

to ensure the most energy-efficient conditioning of the shelter and the 

most balanced use of the equipment. The system determines the need to 

cool or heat the shelter based on an indoor temperature sensor and outside

temperature/humidity sensor connected directly to the controller. 

When cooling or heating is required, the controller runs the lead unit. 

The lead/lag unit operation rotates every 24 hours to ensure that each 

unit receives equal runtime and to extend the operating life of the units. 

If one of the units is unavailable, for example, scheduled maintenance, the 

system automatically selects the other unit. If the internal shelter temperature 

rises or falls above a certain threshold, the system runs both units