Ingersoll Rand IRN 7.5 HP Manuel D'utilisation Et D'entretien page 34

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OPERATING INSTRUCTIONS
OPERATION
S The dryer operates automatically and requires no further
calibration.
S For maximum performance from your dryer, follow the maintenance
schedule.
S The dewpoint thermometer gives an indication of performance of
the dryer. When the dryer is switched off at ambient conditions, it
displays red. In normal conditions it should be operating in the green
region. If the unit continues to operate in the red region, contact your
local Ingersoll Rand representative.
In order to bypass the dryer, stop the IRN compressor and lock and tag
it out. Turn BOTH valves to a horizontal position, as shown. The
compressor can be run and the dryer can be removed from the system
for repair in bypass mode.
Do not operate with valves in positions other than those shown here.
This may pressurise dryer with no air flow.
IRN 7.5 - 15 HP (5.5 - 11 kW) http://air.ingersollrand.com