VIAIR Quarter Duty OBA - Manual (Page 4)

275C AIR COMPRESSOR INSTALLATION
Your Onboard Air System comes complete with a 275C, 33% duty cycle compressor.
Please follow the installation instructions that follow to enjoy the best use of your onboard air system.
CAUTION - To reduce risk of electrical shock or electrocution:
- Do not disassemble the compressor. Do not attempt repairs or modifications.
Refer to qualified service agencies for all service and repairs.
- Do not use this product in or area where it can fall or be pulled into water or liquids.
- Do not reach for this product if it has fallen into liquid.
- Use this compressor with 12-volt DC systems only.
- This product should never be left unattended during use.
Guidelines for Selecting Mounting Location:
The selection of proper mounting location for your air compressor will help ensure a long
and trouble free compressor service life. Please pay close attention to the following:
- Select a FLAT, UPRIGHT & SECURE LOCATION where the compressor can be mounted.
- To maximize air compressor performance, locate compressor as CLOSE TO THE BATTERY
as possible so that length of positive lead wire required is at a minimum.
- Choose mounting location that is as cool as possible and away from heat sources.
- This compressor is moisture & dust resistant, but NOT WATERPROOF or DUSTPROOF. Do not mount
compressor in locations where the unit is likely to come in contact with water or excessive dirt.
- For compressor with remote filter mounting, select compressor’s mounting location where air line can be
routed from compressor air inlet to remote inlet air filter. Make sure that the remote inlet air filter is located
in a dry location, away from water.
- You will also want to select a compressor mounting location where the leader hose bracket can be mounted
to secure the 2 ft. leader hose.
- If it is necessary to mount the air compressor further from the battery, such as inside your vehicle or in the
bed of your pickup, use a minimum 8 AWG positive lead wire for remote installation.
- Do not mount compressor near areas where flammable liquids are stored.
- Use thread sealant for proper fitting installation. Teflon tape is not recommended.
Properly sealed, recommended torque is 12 to 15 ft. lbs
275C Compressor Wiring: (See Figure 3 on back of manual)
1. Disconnect ground cable from vehicle’s battery.
2. Temporarily position the air compressor in the location where it will be mounted.
3. Route ground wire to the negative post of the battery or to an appropriate grounding point and
cut ground wire to length as needed.
4. Mount the air compressor with the four sets of 13/64” (5 mm) bolts, nuts, washers, and locking washers
provided. Use of thread locker is recommended.
5. NOTE: For Air Filter Installation, refer to Air Filter Installation Instruction included in the Air Filter Pack.
6. This air compressor comes with a heavy duty heat-resistant stainless steel braided leader hose.
This leader hose is designed to prolong the life of your compressor, and air lines.
Do not remove this leader hose from air compressor.
7. IMPORTANT: Please note; the leader hose that came with your compressor has a built-in inline check valve
pre-installed. Do not remove inline check valve.
8. Select a proper location to mount leader hose with hose bracket provided. Avoid locations where leader
hose may become tangled with wires and other hoses.
9. To mount hose bracket, drill holes with 3/16” drill bit and push self–anchoring hose bracket pin into hole.
Route leader hose through hose bracket and secure hose by pressing bracket clamp into locked position.
10. To remove hose from the hose bracket, simply press down on the hose clamp release tab to release
bracket clamp.
11. Connect compressor’s positive lead wire to one of the leads of your pressure switch.
12. Make sure that your compressor setup is properly fused. The 275C pulls 18 amps of power maximum.
13. Always locate fuse as close as possible to power source (battery).
14. Before connecting to power source, check that all connections are made properly.
15. Connect and test compressor system by running the compressor for a short time to build up pressure
in the air tank.
16. Once air pressure reaches preset cut out pressure of your pressure switch, the compressor will shut off.
Inspect all air line connections for leaks with soap and water solution. If a leak is detected, make
connections again as necessary (air line may not be cut squarely).
USER MANUAL
QUARTER DUTY ONBOARD AIR SYSTEM