AIR DRYER SUPPLIER, INC.
AIR DRYER INSTRUCTION MANUAL
Model CATR
Reference ADS-316
Rev 0
Page 21 of 40
03/22/2019
SECTION 3: COOLER ASSEMBLY
3.2
The Pneumatic Motor And Cooling Fan Blade (continued)
A service valve has been provided to shut the supply air off to the motor if
required.
Verify the cooling fan blade for wear or damage to prevent an unbalanced fan
blade from damaging the pneumatic motor bearings.
The cooler assembly is designed to push air in an upward direction. Ensure the
cooler outlet surface is free of obstruction.
3.3
The Pneumatic Regulator
The pneumatic regulator provided is the mechanism that allows for the adjustment of
the cooling fan and motor RPM. The cooling motor and fan will increase in RPM as
the delivery pressure increases to the pneumatic motor. Refer to the data table in
Section 3.4 of this manual for correct adjustment of the delivery pressure for the
cooler assembly. A regulator discharge pressure gauge is provided and will allow the
operator to set the necessary secondary pressure. Review the below bullet points for
more detail.
Caution!
The pneumatic regulator secondary discharge pressure must not exceed 100
psig or pneumatic cooler motor damage can result. If the cooler motor is out
of service, the regulator and mist lubricator should be depressurized by
closing the service valve provided.
During the operation of the dryer cooler system, the regulator needs to be set in
accordance with the recommendation found in the data table provided later in
this section.
If the cooler inlet temperature is only 50ºF to 80ºF above ambient temperatures,
the cooler motor and cooling fan RPM can be reduced thus reducing the amount
of air consumed by the cooler package. Note the coalescing filter outlet
temperature should not exceed 110ºF at any time or dryer outlet dew point will
deteriorate.
The pneumatic regulator will maintain a constant delivery pressure to the cooler
motor even when the primary pressure floats due to pressure fluctuations in the
compressor.