ISC AAC-142-4XT-HC, AAC-142-4XT, AAC-142-4XT-XXXXX Installation And Operation Manual

1. GENERAL INFORMA TION

1.1 PRINCIPLES OF OPERATION

n 1834 Jean Peltier discovered that by passing a current through two dissimilar conductors the
junction of those materials will either absorb or release heat depending on the direction of the
current flow. Thirteen years earlier Thomas Seebeck had discovered that current would flow

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when you placed a temperature gradient across the junction of two dissimilar metals. These
two discoveries were the basis of thermoelectrics. With the advent of modern semiconductors
thermoelectric devices became practical for real world applications and are now found in
everything from consumer goods to spacecraft.

Your ISC Sales, Inc Thermoelectric Air Conditioner operates on this principle so there is no
compressor and no expensive, ozone depleting CFC’s. ISC’s air conditioners use Thermoelectric
“modules” sandwiched between high performance aluminum heat sinks, high CFM axial fans, and a
patented electronic design to “pump” the heat from the inside of your enclosure to the outside,
without exposing your delicate electronics to any outside air or contaminates. See Figure 1.1.

ISC uses only the highest quality components in our air conditioners and you can expect
years of trouble free cooling from these solid-state devices. Every unit we sell is backed by our
one year parts and labor warranty.

AMBIENT AIR

REMOVES HEAT

FROM HOT SIDE

HEAT SINK

HOT
SIDE

HEAT

SINK

FIGURE 1.1

COLD

SIDE

HEAT

SINK

COLD AIR

CIRCULATED

WITHIN THE
ENCLOSURE

COLD AIR

CIRCULATED

WITHIN THE
ENCLOSURE

-800-497-4524 EIC SOLUTIONS, INC. 215-443-5190

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ISC Sales

[e-mail] Toll Free: 800.836.7472

2. INSTALLATION

2.1 CHOOSING A LOCATION ON YOUR ENCLOSURE

When choosing a mounting location for your unit, be sure to keep air flows of both the
interior and exterior heatsinks and fans in mind. Adequate clearance between the fans/heatsinks
and nearby surfaces is required for unrestricted air flows which will ensure optimal performance
and long, trouble free operation. The general rule is to allow a minimum of two inches between
the fans or heatsinks and any surface. Refer to figure 1.1 for an air flow diagram.

Other considerations in deciding on a mounting location include; allowing access to
thermostat (this will be inside the enclosure) if frequent adjustments are to be made; allowing
access to the hot side heat sinks (this will be on the outside of the enclosure) for cleaning if the
unit will be used in a harsh, dirty environment.

2.2 ORIENTATION

Your AC unit can be mounted either vertically on the front, rear or side of your enclosure or
horizontally on the top of your enclosure. See Figure 2.1 and 2.2.

Vertically mounted 500 Btu units are always mounted with the exposed heatsink fins at the
bottom and the fans at the top. (Fig. 2.1) Vertical installations often require the use of a
Condensate Drip Pan (part # DP-V) depending on a number of factors including internal enclosure
temperatures and ambient temperatures, humidity levels, quality of enclosure seals, and
frequency of enclosure opening. We strongly recommend the use of a drip pan to protect the
electronics from dripping condensate. (Fig. 2.1)

Mounting the unit with the fins pointing to either side or straight up will cause condensate
to drip in an uncontrolled manner, possibly damaging electronic equipment within the enclosure.
If one of these orientations is the only possible configuration, contact the Engineering Dept. at ISC
for a custom solution.

Horizontally mounted 500 Btu units always require a drip pan (part # DP-142H) to
prevent dripping condensate from damaging electronic equipment. (Fig. 2.2)

In either orientation, issues regarding access should be considered and minimum clearances
must be maintained as outlined in Section 2.1 of this manual.

Fax: [phone]Local: 972.964.2700

4421 Tradition Trail • Plano, Texas 75093

ISC Sales

[e-mail] Toll Free: 800.836.7472

3. OPERATION

3.1 THERMOSTAT SET POINTS AND HEATING/COOLING UNITS

SETTING THE THERMOSTAT
Your ISC air conditioner is equipped with an adjustable thermostat. The set point you
choose should be based on the desired internal temperature of the enclosure. The air conditioner
will run until the set point temperature is achieved within the enclosure and then the hot side fans
and the thermoelectric cooling modules will shut down. The cold side fan will continue to run,
circulating the air to maintain a uniform temperature within the enclosure.

HEATING AND COOLING UNITS
If you purchased an HC unit (heating and cooling), the heater operation i
fixed-point thermostat. This thermostat is set to turn the heaters on when the temperature within
the enclosure falls to approximately 45° F and turn the heaters off when the temperature rises to
approximately 55° F.
The cooling operation is controlled by the adjustable thermostat. To avoid having the
heating and cooling on at the same time, do not set the cooling thermostat below 70° F.

3.2 MAINTENANCE

s controlled by a

MAINTENANCE

ISC Thermoelectric Air Conditioners are virtually maintenance-free. The only time
maintenance is required is when a unit is installed in an extremely dirty environment. In these
cases, the hot side heat sinks (outside the enclosure) should be in
of dust or dirt. If a build-up is present on the heat sink fins, it can be easily removed as follows:

1. Disconnect the power from the unit.

2. Dry dust/dirt can be removed using compressed air to blow out the heat sinks. Do not
direct any high-pressure air at the fans.

3. NEMA 4X models of our air conditioners are designed to allow for water wash down of the
hot side of the unit, which is outside of the enclosure (never the cold side which is inside
the enclosure). A pressure washer can be used to carefully clean the hot side heat sink
fins. Never direct high-pressure water at the fans or the joint formed by the mounting
flange, gasket and enclosure. Never allow the cold side of your unit to get wet. Always
check your serial label before proceeding with a water wash down.

Keeping the hot side heat sink fins free from any insulating build-up of dirt or dust will ensure

long, trouble-free operation of your air conditioner.

NEVER EXPOSE THE COLD SIDE OF ANY AIR CONDITIONER (INSIDE THE ENCLOSURE) TO

WATER.

If you have any questions about any aspect of your ISC air conditioner, don’t hesitate to call us at
the numbers listed below.

spected regularly for a build-up

Fax: [phone]Local: 972.964.2700

4421 Tradition Trail • Plano, Texas 75093