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STRATUS TA20 Series Industrial Air Conditioners User Manual
1st edition RevA.
Basic Operation
The STRATUS air conditioner will lower the temperature
inside an enclosure to ensure its proper operational temperature.
STRATUS air conditioners, when sized properly, will provide
cooling as necessary, automatically controlled through the
digital temperature controller.
STRATUS air conditioners operate as a “closed loop” system
where the enclosure air is taken into the STRATUS air
conditioner and cooled, and then returned to the enclosure
with no exposure to, or introduction of, outside / ambient
air. This assures the enclosure is separated from, and not
contaminated with, ambient air, dirt, chemicals, dust, moisture
or foreign matter, so that sensitive enclosure components are
protected and kept cool / dehumidified. The STRATUS air
conditioner refrigeration cycle removes warm enclosure air and
excess humidity. The humidity condenses to liquid and the
Condensate Removal System changes it back into vapor where
it is then vented to the atmosphere. In the event of excess water
where the enclosure door has been left open, there is an overflow
hole on the bottom of every unit.
The evaporator fan runs continuously to provide the required
climate control to the enclosure. The compressor turns on if
the enclosure temperature is greater than the factory setpoint of
95°F plus the temperature differential of 5°F. As the refrigerant
pressure builds to a factory setpoint, the condenser fan turns on
to force air flow across the coils. Refrigerant low pressure and
high temperature safety switches shut the compressor off if the
evaporator coil begins to ice up, if there are leaks in the system,
or if the condenser coil overheats. The temperature control
display will indicate an LED alarm indication
((!))
and specific
alarm, such as
HA
for high temperature alarm, or
CA
for low
pressure/low temperature alarm. After the compressor stops,
most alarm conditions will resolve (pressure will equalize) and
the snowflake LED on the temperature control will blink to
indicate that the compressor is off for the five minute anti-short
cycle time delay.
Refer to the Troubleshooting Guide for corrective action, as
the condition may repeat in 7-minute cycles. For 2 minutes
the alarm condition is bypassed to prevent nuisance trips.
Then, there is a 5-minute, anti-short cycle time delay before
the compressor is turned on.
The refrigerant thermal expansion valve assures optimum cooling
efficiency through a wide range of operating temperatures. It
requires no adjustment or maintenance.
STRATUS NEMA/UL type 4X stainless steel units and
NEMA/UL type 4 units come with condenser coils coated with
a cutting-edge, high efficiency, electrically applied, corrosion-
resistant coating.
Closed Loop Cooling
Thermal
Expansion
Valve
Evaporator
Coils
Evaporator
Fan
Compressor
Condensate
Removal
System
Condenser
Coils
Thermal
Expansion
Valve
Evaporator
Compressor
Condenser
Refrigeration Cycle
