The Viper 2000 control system is the top of the line regulation for controlling all the climate component in a bus or coach for up to three climate zones. Using the Viper 2000 you only set the desired temperature for driver's place and passenger compartment, pressing the "AUTO" button, and then the control unit will adjust AC / heat output, fans, flaps etc. accordingly. The Viper 2000 is also very useful when troubleshooting, since it is possible to enter test mode and manually control each climate component. Fact sheet Product information Installation instructions Workshop instructions Auxiliary heater instructions User instructions AC Test / Gas Charge instructions Function check