VIAIR 444C OBA User Manual
DUAL 444C
ONBOARD AIR SYSTEM
PART NO. 20019
IMPORTANT:
It is essential that you and any other operator of this
product read and understand the contents of this manual
before installing and using this product.
SAVE THIS MANUAL FOR FUTURE REFERENCE
USER MANUAL
DUAL 444C ONBOARD AIR SYSTEM
Pressure Switch
Compressor
(+) Lead
Thank you for purchasing this complete, self-contained onboard air system. Contained in one package,
you’ll nd everything you’ll need to install a high performance, onboard air source for your vehicle.
Please follow these instructions to install your new system.
OBA Components:
1 - 2.5 Gallon, 6 port VIAIR Air Tank (Max. 200 PSI)
2 - 444C model VIAIR compressors
2 - 15-ft. Length of 1/4” Air Line (for accessory and gauge installation)
PARTS PACKAGES
Air Tank Installation:
A
G
K L
BNCOD
H I J
E
F
A. Mounting Bolts (4pcs)
B. Flat Washers (8pcs)
C. Locking Washers (4pcs)
D. Nuts (4pcs)
E. Rubber Tank Mount Bushings (6pcs)
F. 1/4” NPT Drain Cock (1pc)
G. 1/4” NPT 250 PSI Safety Valve (1pc)
H. 1/4” NPT Compression Fittings (3pcs)
I. 1/4” NPT M Quick Connect Coupler (1pc)
J. 6-Port Manifold & Bracket (1pc)
K. 1/4” M x 1/8” F Reducer (1pc)
L. 1/4” NPT M Plugs (5pcs)
Compressor Installation:
M
W
X
P Q R1
S
T U1, U2
R2
M. Mounting Bolts (8pcs)
N. Flat Washers (16pcs)
O. Locking Washers (8pcs)
P. Nuts (8pcs)
Q. Remote Mount Air Filter Assemblies (2pcs)
R1. 1/4” NPT F x 3/8” Barbed Fitting (2pcs)
R2. 1/4” NPT M x 3/8” Barbed Fitting (2pcs)
S. 2-pack of Replacement Air Filters (2pcs)
T. Leader Hose Bracket Clips (2pcs)
U1. 3/8” O.D. Air lines (2pcs)
U2. 1/4” O.D. Air lines (2pcs)
V. 60-amp Tube Style Fuse (1pc)
W. Screws (6pcs)
X. Air Line Clips (6pcs)
Pressure Switch & Relays:
Y Z
86
87
30
85
V
Y. Sealed Pressure Switch
(165 PSI on, 200 PSI off) (1pc)
Z. 40-amp Relays (2pcs)
Coil Hose with Couplers:
AA
AA. 30-ft. Coil Hose with close ended
Quick Connect Coupler
USER MANUAL
DUAL 444C ONBOARD AIR SYSTEM
REDUCER
P/N 20019
DUAL OBA PLUMBING DIAGRAM
Typical System Configuration, May Vary Depending on Installation
P/N 10008, 10009
OBA PLUMBING DIAGRAM
Typical System Configuration, May Vary Depending on Installation
2.0
Gallon
Tank
Drain
Cock
Safety
Valve
Pressure
Switch
BSP Adaptors
To Air Lockers
Dash Panel
Gauge
Leader Hose
From Compressor #2
Leader Hose
From Compressor #1
2
5
50
150
75
220
ba
r
psi
0
•
•
•
•
••
••
••
•
175
200
90
125
PARTS PACKAGES (CONT’D)
Accessories:
BB DD EE GG
CC
FF
Air Tools / Carry Bag:
BB. 1/8” BSP F to 1/4” NPT M Adaptors
(for air locker use) (2pcs)
CC. T-Fitting (1/4” M x 1/4” F x 1/4” F NPT (1pc)
DD. 1/4” M NPT Plug (for regulator port block-off) (1pc)
GG. Ination Gun with 0-200 PSI
Pressure Gauge with 1/4” NPT
Quick Connect Stud (1pc)
EE. 1/4” NPT M Compressor Fitting for 1/4”Air Line (1pc)
FF. 0-220 PSI Air Pressure Regulator (1pc)
2.5 GALLON AIR TANK & PLUMBING
The tank comes with six 1/4” NPT port openings to allow installation in many congurations on your vehicle.
To insure safe and trouble-free use of your air tank, we strongly recommend that you install the supplied drain
cock and a safety pressure relief valve. (See Figure 1)
Plumbing Diagram:
(Figure 1)
Safety
Pressure
Switch
Reducer
Valve
Open Ports
Quick Connect
2.5
Gallon
Tank
Drain
Cock
Coupler
Coil Hose
Leader Hose
From Compressor #1
Leader Hose
From Compressor #2
Compression
Fitting
Tank Fittings:
Install the supplied ttings for the air tank in areas where they are most appropriate for your installation
using thread sealant or Teon tape. (Not all installations will be plumbed exactly as shown in schematic.)
Make sure that the safety valve is installed in the top most position on the tank, and that the drain cock is
installed in the lowest position on the tank if the tank is to be installed in any other position than upright on
the tank’s mounting legs. Be sure that all ttings are accessible later in the installation process since you
will have to plumb air lines to each tting as needed to utilize the air tank.
USER MANUAL
DUAL 444C ONBOARD AIR SYSTEM
2.5 GALLON AIR TANK & PLUMBING (CONT’D)
Mounting the Tank:
We have included 6 pieces of rubber bushings in your tank mounting hardware. You have the option of
using two layers of rubber bushings on one of your tank lags to slightly tilt tank toward the drain cock port to
improve drainage properties. Use the provided longer bolts, and corresponding washers, lock washers and
nuts to mount the tank to a suitable chassis or other place on your vehicle.
IMPORTANT:
- Tank is rated for 200 PSI maximum working pressure.
- Tank is NOT to be used as a breathing device.
- Use only attachments or tools rated for 200 PSI working pressure or less.
CAUTION! DO NOT PRESSURIZE YOUR TANK UNTIL YOU HAVE INSTALLED
ALL NECESSARY PORT FITTINGS AND ACCESSORIES.
- Apply sealant to threads of ttings prior to assembly and tighten each part with a wrench.
- Do not over tighten if your port ttings are made from brass, since brass threads can be stripped.
- Bleed pressure from tank before servicing or adding attachments.
WARNING: FAILURE TO DRAIN TANK AND REMOVE CONDENSATION
WILL CAUSE TANK TO RUST PREMATURELY.
- To remove accumulated condensation inside the tank, bleed pressure from tank until pressure is
approximately 5-20 PSI using drain cock
- Drain tank by opening the drain cock drain valve and close after draining tank.
- If drain cock valve is plugged, release all air pressure from tank, remove drain valve and clean, then reinstall.
IMPORTANT: Please observe air tank’s Date of Manufacture (stamped on tank leg).
Replace air tank 2 to 5 years from date air tank was rst used, or use the date of manufacture as reference.
Adhering to air tank draining guidelines will prolong the life of your air tank.
PLEASE NOTE: RUSTED TANKS CAN FAIL CAUSING EXPLOSIONS OR FATAL INJURIES.
Discard tank immediately if tank is rusted.
SAFETY VALVE: When using a safety pressure relief valve, point the safety pressure relief valve away
from your body when releasing air. Use the pull ring on the safety relief valve to vent pressure from the
tank before servicing.
USER MANUAL
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