Factory mounted control system to protect refrigeration system at elevated ambient temperatures. Required when inlet air to the condenser coil is above 38°C to a maximum of 49°C. Available on WG40 & WG75 ducted Models. Check specific heat load before ordering any unit. WG40 & WG75 models are suited for 50Hz (Europe, Australia, most of Asia, Africa); check locally if you don’t know your frequency.