VIAIR Dual 450C OBA - Manual (Page 6)

DUAL 450C OPERATING INSTRUCTIONS
IMPORTANT: The compressors have a maximum working pressure of 150 PSI. Always operate the
compressor at or below the MAXIMUM PRESSURE RATING of the compressor. Operation exceeding
maximum pressure ratings and or duty cycle will result in damage to air compressor.
1. Your air compressor is equipped with an AUTOMATIC THERMAL OVERLOAD PROTECTOR.
This feature will protect the air compressor from overheating and causing permanent damage to your air
compressor. The thermal overload protector will automatically cut off power to your air compressor should
the internal operating temperature of the air compressor rise above safe levels during excessive use.
2. Should your air compressor automatically shut off during use, turn power to the system off. The automatic
thermal overload protector will automatically reset when internal temperature of the air compressor drops
below safe levels. After allowing air compressor to cool off for about 30 minutes, you can safely resume use
of the air compressor by turning on the system.
3. To prevent discharge of your battery and to provide peak performance, it is recommended that you keep
the engine running while the air compressor is in use.
4. ONLY OPERATE THE AIR COMPRESSOR IN WELL-VENTILATED AREAS.
Dual 450C Compressor Maintenance & Repairs:
1. Periodically check all electrical and fitting connections. Clean and tighten as needed.
2. Periodically check all mounting screws. Tighten as needed.
3. Replace air filter element periodically. Replacement frequency depends on operating frequency and
operating environment. For frequent use in dusty environment, you should replace air filter element
more often.
4. Regularly clean dust and dirt from compressor.
5. Your air compressor is equipped with permanently lubricated, maintenance-free motor.
Never lubricate compressor.
6. Repairs should be performed by Manufacturer or Manufacturer’s Authorized Service Agencies only.
CAUTION: Never touch the air compressor or fittings connected to the air compressor with bare hands during
or immediately after use. Leader hose and fittings will become very HOT during and after use.
Dual 450C Compressor Installation Tips:
1. Always use the remote intake filter option when possible. This will extend the service life of your compressor.
2. If noise reduction from vibration is desired, using the remote mount option for the inlet filter can reduce
operation noise by up to 25%.
3. Always mount the compressor at a point higher than the inlet port of the tank.
This will keep moisture from being able to seep back to the compressor.
4. When mounting the compressor, use a paint pen on the rubber isolators and cover the side to go against the
chassis or mounting location. Then, simply stamp the compressor against the chassis to make an imprint of
exactly where to drill the mounting holes for the compressor.
PRESSURE SWITCH INSTALLATION
Your VIAIR Onboard Air System comes complete with a heavy duty pressure switch that will turn on the
compressor at 110 PSI, and off at 145 PSI. The pressure switch has a 1/4” NPT inlet and pre-applied
thread sealant.
Pressure Switch with Relay Installation Tips:
1. Both terminals of the pressure switch are positive (+) leads. (The use of a relay is always recommended).
2. Never install your pressure switch in direct line from the inlet port coming from the compressor.
Tank pressure could be misread by the pressure switch. Instead, mount the pressure switch on the
tank where it receives air pressure reading from deflected air in the tank.
2. Never use a pressure switch that is rated beyond your compressor’s rated Maximum Working Pressure
(150 PSI).
3. Replace the Pressure Switch P/N 90227 if the pressure switch becomes faulty or
fails in the future.
4. See Fig. 3 for relay and pressure switch installation tips.
USER MANUAL
DUAL 450C ONBOARD AIR SYSTEM