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8 Columbia Drive, Amherst, NH 03031 

08/20/07               Tel: (603) 886-9400  Fax: (603) 889-1844  Website: 

www.controlair.com

                 441-622-019 

 

Installation, Operation, and 

Maintenance Instructions 

 

Type 600 

Volume Booster

 

     

 

INSTALLATION 

The ControlAir Type 600 ratio relay, volume booster is designed for air service only. 
Maximum supply pressure is 250 psig. Maximum signal pressure is 150 psig for the 1:1 
ratio; 75 psig for the 1:2 ratio; 50 psig for the 1:3 ratio, and 25 psig for the 1:6 ratio. 
Operating temperature is -20

0

F to 160

0

F. 

 

Prior to installation clean all air lines to remove dirt and other debris. Apply a small 
amount of compound to the male threads only and install the volume booster so that the 
flow is in accordance with the IN and OUT ports as marked. The signal port is tapped 
into the volume booster through the 1/4" NPT connection on top of the unit. Make sure 
that all connections are tight and that the exhaust vent on the side of the volume booster 
is not blocked. The volume booster can be mounted in any position without effecting 
operation. 
 
The use of a filter to remove dirt and liquid in the air line ahead of the booster is 
recommended for consistent performance.  If an air line lubricator is used, it should be 
located downstream of the Type-600. 
 

OPERATION 

Apply an input signal to the signal port. There are no manual controls on the volume 
booster.  
 

OPTIONAL FIXED NEGATIVE BIAS 

The Type 600 is available with an optional 4 +  1 psig (0.3 + 0.07 BAR) less than the 
signal pressure.  

 

This option allows zero output when utilizing I/P transducers (such as the ControlAir 
Type 500X) that typically only are capable of providing pressures down to 3 psi. Note 
that the negative bias has a tolerance of + 1 psi. This means that the actual bias will 
range from -3 psi to -5 psi. Use the zero adjustment of the I/P to reach desired setting.  
 

MAINTENANCE 

Occasional attention may be required due to the accumulation of foreign material in the 
instrument. The regulator is easily disassembled without removal from the line. Before 
this is done, however, shut off valve upstream of the volume booster to prevent escape 
of air when disassembled. Remove the two No. 8-32 screws on the bottom of the unit 
and pull out the pintle assembly. Wash inner valve assembly with solvent, exercising 
care to avoid damaging diaphragms and valve facings. Avoid such solvents as acetone, 
carbon tet, trichloroethylene. Replace assembly carefully. 

 

If further attention is required, repair kits and replacement parts may be purchased. 
The vent hole in the bonnet should be kept clean. A slight flow of air through this hole is 
necessary for the proper operation of the volume booster. 

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