98C OPERATING INSTRUCTIONS
IMPORTANT: The 98C has a maximum working pressure of 130 PSI and is capable of 10% duty cycle.
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. To prevent discharge of your vehicle’s battery and to provide peak performance, we strongly recommend
that you keep the vehicle’s engine running while using the air compressor.
2. ONLY OPERATE THE AIR COMPRESSOR IN WELL-VENTILATED AREAS.
98C 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.
NOTE: Always mount the compressor at a point higher than the inlet port of the tank to keep moisture from
being able to seep back to the tank.
PRESSURE SWITCH WITH RELAY INSTALLATION
Your VIAIR Ultra-Light Duty Onboard Air System comes complete with a pressure switch and a 40-amp relay
that will turn on the compressor at 80 PSI, and off at 105 PSI. The pressure switch has a 1/8" NPT inlet at the
bottom that will need to be installed into the 1/8" NPT port of the T-fitting supplied in package #2 using thread
sealant to allow it to be plumbed directly to your air tank. (For Relay installation, see Relay Wiring Schematic
contained in Figure 2.)
Pressure Switch Installation Tips:
1. Never install your pressure switch in direct line from the inlet port coming from the compressor.
Tank pressure can be misread by the pressure switch. Mount the pressure switch on the tank where
it receives air pressure reading from deflected air.
2. Never use a pressure switch that is rated beyond your compressor’s rated Maximum
Working Pressure (130 PSI).
3. Replace with P/N 90101 if the pressure switch requires replacement.
Testing Your Onboard Air System:
Run the system to build pressure in tank. When air pressure reaches the pressure switch cut out pressure, the
compressor will shut off. Inspect air line connections for leaks with soap and water sprayed with a spray bottle
onto connections. If leaks are detected, lines may not be installed properly. Periodically check your system in
this manner should your compressor turn on more often than normal without frequent air use.
USER MANUAL
ULTRA-LIGHT DUTY ONBOARD AIR SYSTEM
RELAY WIRING SCHEMATIC
Pressure Switch
86
Fused
12-Volt
30
To Ground
85
87
Compressor
(+) Lead
Relay Wiring Schematic:
(Figure 2)
Summary of Contents for 10000
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