USER MANUAL
400H-A - 450H-A Hardmount Automatic Air Compressor Kit
COMPRESSOR APPLICATION GUIDE
To ensure that you get the highest level of satisfaction from your compressor performance, refer to
information below:
VIAIR COMPRESSOR REFERENCE CHART
COMPRESSOR SERIES
MAX. WORKING
DUTY CYCLE
PRESSURE
(100 PSI @ 72°F)
090 SERIES
120 PSI
9%
092 SERIES
120 PSI
9%
095 SERIES
120 PSI
9%
097 SERIES
130 PSI
10%
098 SERIES
130 PSI
10%
100 SERIES
130 PSI
15%
250 IG SERIES
150 PSI
100%
275 SERIES
150 PSI
25%
280 SERIES
150 PSI
30%
325 SERIES
150 PSI
33%
330 IG SERIES
150 PSI
100%
350 SERIES
150 PSI
100%
380 SERIES
200 PSI
100%
55% @ 200 PSI
400 SERIES
150 PSI
33%
420 SERIES
150 PSI
33%
425 SERIES
175 PSI
33% @ 175 PSI
50%
444 SERIES
200 PSI
100%
50% @ 200 PSI
450 SERIES
150 PSI
100%
450 IG SERIES
150 PSI
100%
460 SERIES
150 PSI
100%
480 SERIES
200 PSI
100%
50% @ 200 PSI
485 SERIES
200 PSI
100%
100% @ 200 PSI
ABOUT COMPRESSOR DUTY CYCLE:
Duty cycle refers to the amount of time a compressor can be operated in a given time period at 100
PSI, and a standard ambient temperature of 72° F. It is commonly expressed in percentage format:
Compressor on time ÷ (on time + off time) = Duty Cycle %.
ONE-HOUR DUTY CYCLE
MINUTES ON /
(100 PSI @ 72°F)
MINUTES
OFF
9%
5 Min. On / 55 Min. Off
10%
6 Min. On / 54 Min. Off
15%
9 Min. On / 51 Min. Off
20%
12 Min. On / 48 Min. Off
25%
15 Min. On / 45 Min. Off
30%
18 Min. On / 42 Min. Off
33%
20 Min. On / 40 Min. Off
50%
30 Min. On / 30 Min. Off
100% 1 Hour Run Time
NOTE: All compressors, regardless of rated duty cycle, require sufficient rest time in between cycles
to allow for partial or complete heat dissipation. Heat dissipation rates may vary depending on
ambient temperatures and operating conditions.
ABOUT RATED WORKING PRESSURE:
To ensure trouble free service life of your compressor, always operate compressor within rated
working pressure of the compressor. Never use a pressure switch with a higher cut-off pressure than
compressor’s rated working pressure.