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VIAIR 325C - User Manual

VIAIR 325C
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325C AIR COMPRESSOR KIT
PART NO. 32530 - 32533 - 32534 - 32538
350C AIR COMPRESSOR KIT
PART NO. 35030 - 35033
400C AIR COMPRESSOR KIT
PART NO. 40040
450C AIR COMPRESSOR KIT
PART NO. 45040
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
325C 350C
400C 450C

Questions and Answers

  • M
    Mr. Micheal Wood Jr.Jul 26, 2025
    How to reduce excessive moisture in VIAIR 325C discharge?
    • J
      Jessica LawsonJul 26, 2025
      Excessive moisture in the discharge of your VIAIR Air Compressor may be due to: * Excessive water in the air tank: Drain the tank, tilting it to ensure complete drainage. Drain the tank more frequently. * High humidity: Move the compressor to an area with less humidity or use an airline filter.
  • K
    Karen MartinJul 31, 2025
    Why does my VIAIR 325C Air Compressor run continuously and open the safety valve?
    • A
      Allison FletcherJul 31, 2025
      If your VIAIR Air Compressor runs continuously and the safety valve opens, it could be due to a faulty pressure switch or a defective safety valve. Try replacing the pressure switch or the safety valve to resolve this issue.
  • C
    Christine GriffinAug 3, 2025
    What to do if my VIAIR 325C runs continuously and has low airflow?
    • W
      William HollandAug 4, 2025
      If your VIAIR Air Compressor runs continuously and the airflow is lower than normal, the issue could stem from several causes: * Excessive air usage: Decrease air usage. * Loose connections: Check all connections with a soap and water solution and tighten them. * Worn piston ring or inlet valve: Replace the compressor. * Clogged air filter element: Replace the air filter element.
  • K
    Karen JohnsonAug 8, 2025
    Why will my VIAIR Air Compressor not run?
    • M
      michele97Aug 8, 2025
      If your VIAIR Air Compressor will not run, there are several potential causes: 1. No power or the power switch is in the OFF position: Ensure the compressor switch is ON. 2. Blown fuse: Disconnect the compressor from the power source and replace the fuse. Check the specifications section for the correct fuse amperage. 3. Motor overheats: Allow the compressor to cool off for about 30 minutes to allow the thermal overload switch to reset. 4. Faulty pressure switch: Replace the pressure switch.
  • C
    Carl JohnsonAug 12, 2025
    How to fix a VIAIR 325C Air Compressor when tank pressure drops after shut off?
    • J
      Jason SinghAug 12, 2025
      If the tank pressure drops when your VIAIR Air Compressor shuts off, it could be due to: * A loose drain cock: Tighten the drain cock. * A leaking check valve: Replace the check valve or the compressor. * Loose connections: Check all connections with a soap and water solution and tighten them.
  • Y
    yrussoAug 17, 2025
    Why does the thermal overload protector cut out repeatedly on my VIAIR 325C?
    • A
      Alejandra BautistaAug 17, 2025
      If the thermal overload protector in your VIAIR Air Compressor cuts out repeatedly, it could be due to: * Lack of proper ventilation or high ambient temperature: Move the compressor to a well-ventilated area or an area with a lower ambient temperature. * Failed compressor valves: Replace the compressor.
  • J
    Joann DyerAug 21, 2025
    What causes excessive knocking or rattling in a VIAIR Air Compressor?
    • A
      Austin FieldsAug 21, 2025
      Excessive knocking or rattling in your VIAIR Air Compressor can be caused by: * Loose mounting bolts: Tighten the bolts. * Worn bearing on the eccentric or motor shaft: Replace the bearing or piston assembly. * Worn cylinder or piston ring: Replace the piston or compressor.

Summary

Important Safety Instructions

Electrical Shock Precautions

Warnings to prevent electrical shock, including avoiding water and using 12-volt DC systems only.

Injury Prevention Warnings

Safety guidelines to prevent personal injury, such as avoiding hot surfaces and flammable materials.

Installation

Mounting Location Selection

Advice on choosing the best mounting spot for the compressor to ensure longevity and performance.

Mounting and Wiring

Operating Instructions

Maintenance and Repairs

Specifications

Compressor Application Guide

Compressor Duty Cycle Explanation

Details on what compressor duty cycle means and how it's calculated.

Wire Gauge Guidelines

Charts for recommended wire gauge based on amp draw and wire length for 12V and 24V systems.

Troubleshooting Guide

Manufacturer Defect Warranty

VIAIR 325C Specifications

General IconGeneral
Max Working Pressure150 PSI
Duty Cycle33%
Voltage12V
Dimensions10.5" x 4.5" x 7.5"
Weight6.5 lbs
Motor TypePermanent Magnetic Motor

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