VIAIR Dual 400C OBA - Manual (Page 7)

USER MANUAL
DUAL 400C ONBOARD AIR SYSTEM
INLINE PRESSURE REGULATOR INSTALLATION
Your Onboard Air System comes complete with an adjustable inline air pressure regulator that may be
used to regulate the pressure in your air tank down to any pressure below 150 PSI. This is especially
useful for installations that will supply air to a locking differential, or may be used to operate air tools.
Never attempt to use the regulator to adjust any tank pressure over 150 PSI, since the component is
only rated to a maximum of 150 PSI.
1. Mounting the Inline Pressure Regulator:
Select a mounting location with a rigid mounting surface such as the bottom edge of a chassis.
Use the inline pressure regulator mounting bracket as a template to mark the two mounting points to be drilled.
Carefully drill the two holes as marked, and mount the Pressure Regulator at this time.
2. Air Line Connections to Inline Pressure Regulator:
Use a 1/4” NPT compression fitting on the “IN” side of the regulator receiving air from the air tank.
On the “OUT” side of the regulator, you may install a 1/4” NPT quick connect coupler, or use another 1/4” NPT
compression fitting to route the air line to the source of the item that pressure is being regulated to. If you are
plumbing to air locking differentials, we have included two 1/8” BSP Female to 1/4” NPT Male Adapters for this
use. You may require a T-fitting (included in the package), depending on your application.
3. Adjusting pressure 0-150 PSI:
The pressure regulator knob locks when pushed towards the unit. To adjust pressure, simply pull knob
away from the regulator body and adjust as needed. Always lock the adjustment knob in place before using
pressure-adjusted air supply to keep pressure regulated at a fixed pressure. (See Figure 2)
Pressure Regulator Diagram:
(Figure 2)