Altec AIR MHT Series, Owner'S Manual

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MAINTENANCE PROCEDURES
Daily Maintenance
 Check the operation of the automatic drain valves at least once during each eight hour shift.
 Check Dew point Indicator to make sure it is the proper range. (UA10 to UA55 & MHT25)
 Check Suction Pressure Gauge to make sure it is the proper range. (UA75/MHT40 and larger)
 Check Discharge Pressure Gauge to make sure it is the proper range. (UA400/MHT200 and larger)
 Make sure condenser coil is clean and unobstructed.
Weekly Maintenance
 Clean Air Cooled Condenser Coils - Blow off all dust and dirt that is on the condenser with a
compressed air maintenance gun. While cleaning the condenser fins do not damage fins .
WARNING
DRYER FAILURE DUE TO A DIRTY CONDENSER IS NOT COVERED UNDER WARRANTY
HOW THE AIR DRYER WORKS - UA/MHT SERIES
UA Series refrigerated compressed air dryers use refrigeration cooling to condense entrained moisture
out of the compressed air stream.
Warm saturated air enters the air-to-air heat exchanger at the dryer inlet. In the air –to- air heat
exchanger the inlet air is pre-cooled by the outgoing cold air. The pre-cooled air then enters the air to
refrigerant heat exchanger where it is cooled to its lowest point in the evaporator.
As the air is cooled moisture in the air changes from a vapor to a liquid. The liquid condensate is
removed from the airstream by the separator and discharged from the dryer by the automatic drain
valve. The cold air is reheated by incoming warm air as it passes back through the air-to-air heat
exchanger.
Pre-cooling the inlet air reduces the heat load on the refrigerant compressor, permitting the use of a
smaller refrigerant compressor. The out going cold air is re-heated by the incoming hot air. As a result
the outlet air is warmed up as it leaves the dryer. This prevents the outlet pipe from sweating. The air
exits the dryer and is now clean and dry, ready for use.