VIAIR Super Duty OBA - Manual (Page 5)

DUAL 325C AIR COMPRESSOR INSTALLATION
(USE CONTENTS OF PARTS PACKAGE #2)
Your Onboard Air System comes complete with two very fast, 33% Duty Cycle compressors.
Please follow these installation instructions 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
325C 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 compressors with the eight sets of 13/64” (5 mm) bolts, nuts, washers, and locking
washers provided. Use of thread locker is recommended.
5. NOTE: For Remote Inlet Air Filter Installation, refer to Remote Inlet Air Filter Installation Instruction
included in the Remote Inlet Air Filter Pack for installation of Remote Inlet Air Filter.
6. This air compressor comes with a heavy duty heat resistant stainless steel braided leader hose with
1/4” NPT fittings. This leader hose is designed to prolong the life of your air line. 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 from leader hose.
8. Select a proper location to mount leader hoses with hose brackets 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. Tie compressor’s positive lead wires together and connect to pressure switch lead.
12. Make sure that your compressor setup is properly fused.
Dual 325C compressors pull approximately 40 maximum amps of power.
13. Always locate fuse as close as possible to power source.
14. Before connecting to power source, check to make sure 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 your 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, the air line
may not be cut squarely or pushed all the way in. Tighten connections if needed.
USER MANUAL
SUPER DUTY ONBOARD AIR SYSTEM