ISC AAC-141 Series User manual

Thermoelectric Air conditioner installation and
operation manual
FOR 800 Btu MODEL #’S
AAC-141-T-E
AAC-141-4XT-E
AAC-141-T-E-HC
AAC-141-4XT-E-HC
AAC-141-XXXXX
Quality enclosures and cooling
solutions for every environment

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1-800-497-4524 EIC SOLUTIONS, INC.215-443-5190
TABLE OF CONTENTS
1. GENERAL INFORMATION
1.1
PRINCIPLES OF OPERATION ........................................................................................... 3
2. INSTALLATION
2.1
CHOOSING A LOCATION .......................................................................... 4
2.2 ORIENTATION............................................................................................. 4
2.3
PREPARING THE ENCLOSURE ................................................................ 6
2.4
INSTALLING THE AIR CONDITIONER ..................................................... 6
INSTALL THE DRIP PAN ........................................................................... 7
APPLY POWER............................................................................................ 8
3. OPERATION
3.1
THERMOSTAT SET POINTS AND HEATING COOLING UNITS........... 10
3.2
MAINTENANCE........................................................................................ 10
EIC SOLUTIONS INC.
1825 STOUT DRIVE
WARMINSTER, PA 18974
PHONE [phone] or 1-800-497-4524
FAX [phone]
EMAIL [email protected]

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1-800-497-4524 EIC SOLUTIONS, INC.215-443-5190
1. GENERAL INFORMATION
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
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 Solutions 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 SINKS
COLD AIR
CIRCULATED
WITHIN THE
ENCLOSURE
HOT
SIDE
HEAT
SINKS
COLD
SIDE
HEAT
SINKS
FAN FAN
FIGURE 1.1
I

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1-800-497-4524 EIC SOLUTIONS, INC.215-443-5190
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 800 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 800 Btu units always require a drip pan (part # DP-141H) 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.

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1-800-497-4524 EIC SOLUTIONS, INC.215-443-5190
FIGURE 2.1
FIGURE 2.2

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1-800-497-4524 EIC SOLUTIONS, INC.215-443-5190
2.3 PREPARING THE ENCLOSURE
To mount the 800 Btu unit you will need to cut an opening in your enclosure and drill
mounting holes. A cut-out drawing (Fig. 2.3) showing the cut-out size and hole locations has been
included in this manual (see Fig. 2.3). The instructions for installing the air conditioner are printed
below.
TOOLS AND MATERIALS NEEDED:
•Pencil
•Scissors
•Tape Measure
•Jigsaw or suitable alternative
•Electric drill
•# 29 drill bit (.136”)
•# 8-32 tap and tap handle
•# 8-32 x 3/8” stainless machine screws, 8 screws for NEMA 12 installations, 16 screws for
NEMA 4X installations (16 have been supplied)
•Sixteen nylon washers to be used in NEMA 4X installations (supplied)
•One neoprene gasket (supplied)
CUT THE OPENING AND DRILL MOUNTING HOLES IN THE ENCLOSURE
1. Using the guidelines provided in the installation manual choose an appropriate location for
the air conditioner on your enclosure.
2. Layout the cut-out and hole pattern for the AC on the enclosure. Refer to Figure 2.3.
3. Before cutting or drilling check that the location meets the clearance requirements as
specified in the installation manual.
4. Using a pencil, center punch or other method, mark the exact center point of each
mounting hole on the enclosure. You will use 8 holes for a NEMA 12 installation and all 16
holes for a NEMA 4X installation.
5. Using the jigsaw, cut the opening in the enclosure.
6. Using the # 29 drill bit, drill a hole at each of the marks you made earlier.
7. Using the 8-32 tap, tap each of the holes you have drilled.
2.4 INSTALLING THE AIR CONDITIONER
INSTALL THE AIR CONDITIONER
1. Lay the air conditioner down with the thermostat facing up.
2. Take the supplied gasket and lay it down on the flange.
3. Take one of the supplied mounting screws and, from the under side of the flange, push it up
through the top, right mounting hole, and through the hole in the gasket. The gasket hole
is undersized and will hold the screw in place. Repeat this on the top left mounting hole.
4. Set the AC unit in the hole you’ve cut in the enclosure, and using a screwdriver, carefully
secure the two screws you attached to the gasket to the tapped holes in the enclosure. Do
not tighten these at this time.
5. Install the rest of the screws in the flange placing a nylon washer on each fastener and
screw them into the tapped holes in the enclosure.
a. If you have purchased a vertical drip pan, you will need to install the three long
screws in the three center holes in the bottom flange.

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b. If this is an indoor installation with no chance of exposure to water or other liquids,
you can use 8 screws per the NEMA 12 pattern in Fig. 2.3.
c. If this is a NEMA 4X installation (outdoors or chance of exposure to liquids) use all 16
screws provided.
6. Remove the two started screws and place a nylon washer on each and reinstall.
7. Tighten all screws.
FIG. 2.3
INSTALL THE DRIP PAN
1. Two hose fittings were provided with the drip pan, a right angle and a straight one. Choose
one and install it on the drip pan. Be sure if you use the right angle fitting it is facing the
desired direction prior to installing the drip pan.
11.375
11.375
2.250
5.690
9.125
.250
.250
2.250
5.690
9.125
NEMA 12 INSTALLATIONS:
USE ONLY HOLES MARKED
WITH (8 HOLES TOTAL).
NEMA 4X INSTALLATIONS:
USE ALL HOLES (16).

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2. There are three mounting holes in the drip pan, match these with the long mounting screws
protruding into the enclosure at the bottom of the AC unit. Push the drip pan onto these
screws.
3. Using the three 8-32 keps nuts provided, attach the drip pan to the air conditioner.
4. Attach the supplied PVC drain tube to the hose fitting on the drip pan. This tube should be
routed to the bottom of the enclosure and fed through a 3/8” hole to the outside.
5. If you purchased a horizontal drip pan, it is installed at the factory and you will only need to
install the hose fitting and PVC drain hose.
YOU MUST USE A HORIZONTAL DRIP PAN IF YOU INSTALL THE AIR CONDITIONER HORIZONTALLY
(FIG 2.2) ON THE TOP OF YOUR ENCLOSURE. FAILURE TO DO SO MAY ALLOW CONDENSATE TO
DRIP IN AN UNCONTROLLED MANNER CAUSING DAMAGE TO YOUR EQUIPMENT.
APPLY POWER
Once the air conditioner is mounted, check the serial label and confirm the voltage required
and then apply appropriate power as outlined below.
120 VAC units – plug into standard 120 volt, grounded outlet. Amperage for a 120 VAC unit is
3.5 amps.
220 – 240 VAC units – this unit will not have a plug on the end. Connect the wires to an
appropriate power source using standard safe wiring methods. Wire colors are as follows:
Black or Brown – line
White or Blue – line/neutral
Green or Green/Yellow – ground
A wiring diagram is shown in Fig. 2.4 below. Amperage for a 220 VAC unit is 2.5 amps.
Figure 2.4

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1-800-497-4524 EIC SOLUTIONS, INC.215-443-5190
DC voltage units – this unit will not have a plug on the end. Connect the wires to an
appropriate power source using standard safe wiring methods. Wire colors are as follows:
Red-Positive
Black-Negative
Green–ground
A wiring diagram is shown in Fig. 2.5 below.
Figure 2.5
For other voltages you will receive a separate wiring diagram showing the correct method
of applying power.
If you purchased a Digital Temperature Controller with your AC unit, a separate wiring diagram
has been provided which will show the correct method of applying power to your particular air
conditioner.
Upon applying power to the air conditioner the fan on the cold side (inside the enclosure) will
come on. The hot side fans (outside the enclosure) may also run depending on where the
thermostat is set. The cold side fan always runs to circulate air within your enclosure thereby
eliminating any “hot spots”. The hot side fans will only run when the air conditioner is cooling –
they are “pumping” the heat from the inside of your enclosure to the outside air.

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1-800-497-4524 EIC SOLUTIONS, INC.215-443-5190
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 is controlled by a
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
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 inspected regularly for a build-up
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.
ONLY NEMA 4X UNITS, WITH MODEL NUMBERS BEGINNING WITH “AAC-141-4XT”, ARE
DESIGNED FOR THE HOT SIDE OF THE AIR CONDITIONER (OUTSIDE THE ENCLOSURE) TO
TOLERATE EXPOSURE TO WATER.
NEMA 12 UNITS, WITH MODEL #’S BEGINNING WITH “AAC-141-T”, ARE NOT DESIGNED TO BE
EXPOSED TO WATER AND SHOULD NEVER BE WASHED DOWN.
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.