4421 Tradition Trail ● Plano, Texas 75093 ● 972-964-2700 ● 800-836-7472
SP-ENG-211-000-19 Rev 1.0
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P a g e
An air conditioner is designed to dehumidify and extract heat from an area, or provide heat to an area.
The cooling is done using a simple refrigeration cycle. A product of this simple refrigeration cycle is
excess humidity that condenses to a liquid.
DELTA-T air conditioners are designed using an advanced refrigeration cycle and are equipped with a
Condensate Removal System that changes the excess humidity liquid into a vapor which is then vented
to the atmosphere. In the event of excess water vapor where the enclosure door has been left open
there is an overflow hole on the bottom of every unit. Please contact ISC if you encounter excess water
coming from your air conditioner.
Preliminary Testing
Before mounting the air conditioner to the enclosure, test for proper operation. Follow the steps below
prior to installation.
WARNINGS
The air conditioner must sit upright for 24 hours to assure the compressor oil has drained down to the
compressor. Check the unit label to assure the electric power available to the air conditioner is the proper
voltage and phase. Check the electric power source for proper ground wire and neutral wire installation
per 2011 NEC. Assure that the electric power is protected by a circuit protection device; refer to the Unit
Specification section in this manual for proper circuit protection sizing.
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Connect a power source to the air conditioner and turn on the power switch. The evaporator fan
will start and the digital controller will power up. If cooling is called for, the compressor will start in
3 minutes.
•
If desired, change the cooling set point. Refer to Digital Temperature Controller Programming
section on this manual for details on changing the set point. Factory default settings should be
satisfactory; however you may want to adjust heat, cooling and alarm set points for your specific
application.
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The condenser fan is controlled by the refrigerant high heat pressure and will turn on later when
the operating pressure builds up. This feature allows low ambient operation and reduces current
inrush at initial power on.
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Run the air conditioner for 15 minutes; during this time the condenser fan will turn on after the
condenser coil warms up.
Note: Ambient Temperature must be at least 75°F.
•
Turn the unit off if the equipment makes any unexpected or hard mechanical noises or vibrations
and refer to the troubleshooting guide in this manual.
•
The supply cold air should be at least 10°F colder than the return air entering the unit. If it is not,
refer to the troubleshooting guide in this manual;
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When you are satisfied that the unit is operating properly, turn unit off, disconnect the power and
mount the unit on the enclosure in accordance with the Mounting the Air Conditioner section in
this manual.
