Ross RABD255/100/2.5, Instructions For Installation, Use And Maintenance Manual

9  

Air Compressor

Operation 
 

The pressure in the tank is controlled by the action of the pressure switch located under the 
pressure switch cover  
 
When the set maximum pressure is reached the pressure switch activates and the motor is 
turned  off. The pressure  will then decreases as the air is used  until the set minimum is 
reached after which the pressure switch turns  the motor to on again. 
  
The operator of the compressor should be well aware that during use of the compressor the 
motor will  cycle (start and stop) under the influence of the rising or falling pressure in the tank  
and the motor will start without any warning. 
 
The maximum and minimum pressures are factory set and should not be altered. 
 
. 
 

Turning the compressor ON and OFF 
 

Use the red knob on top of the pressure switch to turn the unit on and off.  Pull the knob up to 
turn the compressor on and push the knob in to turn it off. Turning the unit on and off from the 
mains supply only will result in damage to the motor and void warranty as the pressure switch 
has an additional function to purge the air trapped in the delivery pipe when the motor is 
turned off. This minimizes the load on the motor when it is next started.  

 
When storing or finishing with the compressor 
 

Check: 
 



The on/off button is in the off position 



The mains cord is disconnected from the mains supply. 



The all the air is discharged from the tank 
(empty the tank) 



Store in a location to prevent damage from foreign objects or water etc.