PRINCIPLE OF OPERATION SECTION 5
20
dust and dirt accumulation on the condenser
coils. Air temperature should not exceed
110ºF(43ºC). A clearance of 24 inches (61
cm)
9. Fan motor and compressor rotation: This unit
has been equipped with a phase sensing
controller. If the unit will not start please
reverse any two of the three phases and
restart the unit. Cooling air should exhaust
through the condenser coils away from the
fan motors.
5.2 COMPRESSED AIR HEAT
EXCHANGER
AIR TO AIR SIDE
1. Pre cooling: Warm, saturated compressed
air enters the air-to-air heat exchanger,
where it is cooled by the outgoing cooled
compressed air flowing in a counter flow
direction.
2. Pre-separation: As the air is pre-cooled,
some of the moisture condenses. During this
phase, all condensed moisture and oil is
separated from the compressed air.
3. Thermal Mass: The air then enters and is fur-
ther cooled in the refrigeration air to glycol
chamber. The air stream is cooled to 35-39ºF
(1.6-3.8ºC), reducing its dew point to this
temperature.
4. Separation: As the air is cooled in the air to
glycol chamber, the moisture condenses into
a liquid. At this point, all liquid, passing
through the separator is removed from the
air stream and drained away with an elec-
tronic drain
5. Recuperation: The cold, dry air is reheated
by incoming warm air as it passes back
through the air to air heat exchanger in a
counter flow direction.
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