Viair Heavy Duty OBA User Manual download pdf (Page 8)

USER MANUAL

HEAVY DUTY ONBOARD AIR SYSTEM

TROUBLESHOOTING GUIDE:

Tank pressure drops when

compressor (s) shut off

1. Loose drain cock

2. Check valve leaking

3. Loose connections

1. Tighten drain cock

2. Replace check valve or

compressor(s)

3. Check all connections with

soap and water solution and

tighten

Compressor runs continuously

and air ow lower than normal

1. Excessive air usage

2. Loose connections

3. Worn piston ring or inlet

valve.

4. Clogged air lter element

1. Decrease air usage

2. Check all connections with

soap and water solution and

tighten.

3. Repair or replace compressor

4. Replace air lter element

Compressor runs continuously

causing safety valve (if equipped)

to open

1. Bad pressure switch

2. Defective safety valve

1. Replace pressure switch

2. Replace safety valve

Excessive moisture in discharge 1. Excessive water in air tank

2. High humidity

1. Drain tank, tilt tank to drain.

Drain tank more frequently

2. Move compressor to area

with less humidity, or use air

line lter.

Compressor will not run 1. No power, or power switch

in OFF position

2. Blown fuse

3. Motor overheats

4. Faulty pressure switch.

1. Make sure compressor

switch is ON

2. Disconnect compressors

from power source, replace

fuse. (Refer to Specications

section for correct fuse

amperage.)

3. Let compressors cool off for

about 30 Minutes to allow

thermal overload switch reset.

4. Replace pressure switch

Thermal

overload protector cuts out

repeatedly

1. Lack of proper ventilation or

ambient temperature too high

2. Compressor valves failed

1. Move compressor to well

ventilated area, or area with

lower ambient temperature

2. Repair or replace compressor

Excessive

knocking or rattling

1. Loose mounting bolts

2. Worn bearing on eccentric or

motor shaft

3. Cylinder or piston ring is worn

1. Tighten mounting bolts

2. Repair or replace

compressor

3. Repair or replace

compressor

CAUTION: NEVER DISASSEMBLE COMPRESSOR WHILE

COMPRESSOR IS PRESSURIZED.

POSSIBLE CAUSE(S) PROBLEM CORRECTIVE ACTION

1 2 3 4 5 6 7 8 9 10 11

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