User & Technical Manual
HC201 Series
Rev 1.0
Title: HC201 Air Conditioner Technical Manual
Department: Engineering
Objective: To provide important information for maintenance, diagnostics and advance operations of the ISC
HC201 Series Air Conditioners.
Revision History:
Rev Date Owner Description of Changes
1.0 10-06-11 G. Gonzalez Initial Release
Statement of Confidentiality
The Manual and other materials contain proprietary information, comprising ISC Inc.'s trade secrets. Please
maintain the confidentiality of all proprietary information during and after the term of the use agreement. Also,
please refrain from using this proprietary information in any other manner, including in any other business,
without ISC Inc.’s written approval.
ISC Inc. reserves the right to revise and otherwise modify the Manual to reflect changes in the requirements,
standards, and operating recommendations. The Manual is the sole property of ISC Inc. It must be returned
upon the expiration or the termination of the term of use agreement.
By accepting the Manual you have read and understand the Statement of Confidentiality and will abide by its
terms and conditions.
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TABLE OF CONTENTS
Overview 4
Inspecting the Equipment 4
Unpacking the Air Conditioner 4
Moving the Air Conditioner 5
Unit Label 5
Operation 6
Preliminary Testing 6
Mounting the Air Conditioner 7
Unit Specifications 8
Options 10
System Faults 13
Digital Temperature Controller Programming 13
Preventative Maintenance 16
Field Serviceable Parts 17
Safety Information 17
Troubleshooting Guide 18
Physical Dimensions 21
Electrical Schematic 23
Warranty Information 24
Return Material Authorization (RMA) Procedure 25
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Overview
Thank you for your purchase of the ISC Special Purpose Air Conditioner. Our air conditioning
equipment is carefully designed to cool and dehumidify the air in electronic component enclosures.
ISC has designed air conditioners for all types of electronic equipment enclosures providing capacity
from 1,000 to 24,000 BTUH.
This manual will guide you through the installation, maintenance, diagnostics and advance operations
of the HC201 Series Air Conditioners. This manual contains important information for the end-user
who installs, maintains and/or operates the HC201 Air Conditioner.
Technical Support
By Phone: 972-964-2700 / 800-836-7472
(Monday – Friday, 7:30 am – 5:00 pm Central Time)
By Email: iscinfo@iscsales.com
Our goal is to have continuous improvement for both our equipment and our documentation. We rely
and appreciate your feedback to help us achieve our goal. Our technical support team is glad to work
with you if you require additional technical information not provided in this manual.
Inspecting the Equipment
ISC air conditioning equipment is designed, manufactured and packed to prevent damage from normal
handling, shock and vibration during shipment. It is necessary to inspect your equipment upon receipt
to insure that there is no visual or hidden damage.
Upon receipt of the equipment, insure that it is always top side up as indicated by “THIS SIDE UP”
labels. This insures that the compressor oil is not displaced.
Note: If the equipment has been on its side it must be put upright for at least 24 hours before installing
or running to insure the compressor oil has returned to the compressor.
All physical damage to packing or signs of damage to the equipment must be noted on the freight bill
of lading. Packages must be opened after receipt and inspected for any internal or concealed damage
to the equipment and to verify proper count and order fulfillment. Delivery of without the pallet, not top
side up, other freight on top, damaged or wet should be refused.
Unpacking the Air Conditioner
Always keep air conditioner top up as shown by the packaging label and arrows. If the unit is to be
transported after initial unpacking, place air conditioner back in original packing to prevent damage.
For shipment by UPS or freight carrier, repack as received and re-band to the pallet.
Note: Shipping without being strapped to the pallet may result in tipping and damage, this will void the
warranty.
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Moving the Air Conditioners
Read this section completely before running or installing your ISC air conditioning equipment.
Note: You will need to perform a Preliminary Test before mounting the air conditioner. Refer to the
Preliminary Test section in this manual for instructions on how to run this test. You will also need to
prepare the enclosure that is to be cooled for mounting in accordance with this manual and the
template supplied.
Note: ISC air conditioning equipment must be mounted vertically with a minimum of 3” air space for
condenser air return and supply. If necessary, equipment may be mounted at up to a 5 degree angle
(rotary compressors) without damaging the compressor.
If air conditioner is to be shipped or transported at any time; pack in original packaging and strap to
pallet to prevent damage. Air conditioner must be kept upright at all times. Air conditioners are not
designed to be shipped attached to an equipment enclosure. Air conditioners shipped which have
internal damage due to shipping while attached to enclosures are warranty voided.
Unit Label
Each air conditioner has a unit label, be sure to record the data from the label to the template below
and keep this information in a safe place for warranty and ordering parts. To prevent damage to
equipment, electrical panel and wiring, and to prevent personal injury, assure that the power source is
compatible with the equipment before operating. When recharging, refrigeration type and amount
must be the same as shown on the unit label or air conditioner will not operate properly or may be
damaged and may result in the warranty voided and UL listing voided.
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Operation
ISC air conditioners will lower (or increase as necessary) the temperature inside an enclosure to
ensure its proper operational temperature. Our air conditioners, when sized properly, will provide
cooling or heating automatically controlled by the temperature digital controller.
ISC air conditioners operate as a “closed loop” system with no exposure or introduction of outside air.
This insures that the enclosure is separated from and is not contaminated with ambient air, dirt,
chemicals, dust, moisture or foreign matter so that sensitive enclosure components are protected and
are kept at your required operational temperature.
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.
ISC 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 Inc. 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.
• Plug the unit’s power cord into your source to start the evaporator fan and, if desired, change
the 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.
• 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;
• 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.
Mounting the Air Conditioner
Using the template supplied, determine where the air conditioner is to be mounted and assure that all
required cuts and holes will not interfere with or damage the enclosure or its contents. Assure that
there is a 3” clearance between walls / obstructions and the air conditioner for the condenser supply
air and return air flow so that it is not restricted. Restricted condenser air flow will affect the air
conditioner’s performance. Mount the air conditioner high on the enclosure in order to cool the hot air
in the top of the enclosure. Position the unit where the cold air can circulate across the width of the
enclosure to cool it all the way across.
Once proper mounting placement is determined, turn the enclosure equipment off, if possible, to
prevent damage. Drill and cut the holes as indicated on the mounting template. Install insulation
gasket as required to insure an air tight closed loop seal. Be cautious not to let any cutting debris fall
into the enclosure. Attach the hanging bolts as indicated on the template to hold the unit onto the
enclosure and then use the mounting screws that are provided.
Hang the air conditioner on the hanging bolts and from inside the enclosure use the fasteners supplied
to attach the air conditioner to the enclosure. Insure that these fasteners are tight in order to prevent
the unit from falling off the enclosure. These fasteners should be checked periodically to insure that
they have not become loose due to vibration.
Ensure that the power supplied is compatible with the air conditioner’s power requirements. Properly
attach the unit’s power cord to a circuit that meets the equipment requirements and provide a circuit
protection device based on the Unit Specifications section of this manual.
After mounting the air conditioner, replace/close the enclosure door and start air conditioner; test for
air leaks to assure a proper closed air loop seal and run test the unit to assure proper operation after
mounting. If any cold air leaks are found, check for proper mounting and apply silicone-free Lexel seal
if leaks persist. Assure that the air conditioner’s condenser inlet air filter is installed properly and
cleaned regularly.
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SP-ENG-211-100-11 R ev 1 .0 7 | P a g e
Mo de l
IS C
HC 20 12 36
IS C
HC 20 14 86
CAUTION
If mounting the air conditioner to the enclosure door, confirm with the enclosure manufacturer that the
door’s hinges will support the air conditioner’s added weight (see equipment specifications). Insure
that when the door is fully open that the enclosure will not topple over due to the off-center load.
Unit Specifications
The following table provides electrical and refrigeration specifications for the HC201 Series Air
Conditioners.
HC201 Series
Nominal Capacity Rating: 20,000 BTUH
Standard Maximum Ambient: 131°F
Op er ating
Vo ltage
Ra ng e
(V ol ts)
20 7- 25 3 51 .5 0 13.7 *2
44 0- 48 0 24 .6 8 6.56 16 0K
In ru sh
Cu rr ent
(S tart
Up
Cu rrent)
(A mp s)
Lo ading
Cu rr ent
(R unning
Cu rrent)
(A mp s)
(S hort
Ci rc uit
Cu rrent
Ra ting)
(A mp s)
* Time-delay Fuses with the following electrical ch aracteristics are recommended. Fast-acti ng fus es
are not recommended.
% of Ampere Rating Open in g Ti me
110 % 15min Minimum
125 % 1hr Maximum
200 % 12sec Minimum
4min Maximum
*2
SCCR rating is based on the SCC R rati ng for the circuit protection device in stalled in the p anel /
enclosure per UL50 & UL508a to protect th e AC u nit. T ypically 100KA – 200KA for Time-Delay Fuses.
SC CR
Re co mm en ded
Circuit
Pr ot ec tion
(A mp s)
25 A mp Class
CC , CC MR Time
De lay *
12 A mp Class
CC , CC MR Time
De lay *
KV A
Ra ting
(K -
Wa tts)
3. 1 R407f 42 140 / 39 7 n /a 20 5/ 226
3. 1 R407f 42 140 / 39 7 n /a 32 0/ 342
Re fr igerant
Ty pe
Re fr igerant
Am ou nt
(o un ce s)
Lo w/ High
Un it
Pr es su res
(p si )
No ise
Le ve l
(d BA )
We ig ht
(U ni t/Ship
(l bs )
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Options
The HC201 Series Air Conditioners may be ordered with the following options. Review the list below
for the specifications and functions of the option(s) that apply to your unit.
Built-in Heater
This unit is configurable to include a Built-in Heater to increase the temperature of your enclosure in
lower temperature conditions. The digital controller is programmed with an individual heater set point
to maintain your enclosure at your desired operating temperature.
Heater capacities are available in 500 Watt, 1000 Watt and 1500 Watt.
Default Settings:
At the default settings the heater turns on at 52°F and operates until temperature has reached 55°F.
Refer to Digital Temperature Controller Programming section for details on changing these
parameters.
Low Ambient
This option consists of circuitry to protect the compressor in a low ambient temperature environment.
The low ambient package is designed to provide an optimum constant low current in the compressor
motor during the non cooling state. This option provides internal heat to the compressor to protect it
from stalls and hard starts during long periods of compressor off state.
Dry Contact
This option provides an early warning capability to your enclosure to aid in the protection of your
expensive equipment. The Dry Contact is programmed with an individual dry contact set point to
monitor the enclosure temperature limit that you require. When the enclosure temperature has
exceeded the maximum limit, the Form C gold plated contact will activate to notify you that there is a
problem in achieving your cooling set point.
Default Settings:
At the default settings the Dry Contact initial conditions are normally open and/or normally closed.
When the unit is powered on and the temperature exceeds 105°F for a period longer than 3 minutes
the Dry Contact will activate. At this time the normally open contact will close and the normally closed
contact will open. This state will remain until the temperature has decreased to 103°F.
Note: The dry contact is not a power status indicator, rather a high temperature alarm alerting you that
the unit is unable to meet the cooling set point.
• 55°F Heat Set Point
• 3°F Differential
• 105°F Dry Contact High Temperature Alarm Set Point
• 2°F Recovery Differential
• 3min Temperature Alarm Delay
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Refer to Advanced Digital Temperature Controller Programming section on page 8 for details on
changing these parameters.
Celsius Programming
Celsius Programming option allows the user to control the ISC Air Conditioner in SI units. This feature
can be programmed into the digital temperature controller at time of manufacturing. This feature is
also available as an upgrade to air conditioners already in the field equipped with Gen 2.0 controller
via a flash drive key.
External Heat Output
This option allows you to add an external heater to be located anywhere in your enclosure. These
external heaters are ideal for focusing on individual sections of the enclosure without having a large
capacity Built-in Heater.
External Heater capacities available are 100 Watt, 150 Watt, 200 Watt, 250 Watt, 300 Watt,
400 Watt, 550 Watt, 650 Watt & 950 Watt
Default Settings:
At the default settings the heater output turns on at 52°F and operates until the temperature has
reached 55°F. Refer to Advanced Digital Temperature Controller Programming section on this manual
for details on changing these parameters.
Special Programming
All ISC Air Conditioners have a Special Programming option for selecting unique pre in programmed
settings for special requirements. Although most parameters are accessible in our digital controller,
this option allows you to receive a unit preset to your requirements without the need to manually
configure the unit. Refer to Advanced Digital Temperature Controller Programming section for details
on all default settings.
High Ambient
Most of our air conditioners have capabilities for high ambient application upgrades from our Standard
Maximum Ambient temperature of 131°F. With this option we can optimize the Air Conditioner during
manufacturing to achieve improved performance at high ambient conditions.
Open Door Kill Switch
• 55°F Heat Set Point
• 3°F Differential
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This option provides you with an adjustable and mountable safety switch for your electronics
enclosure. This switch will disable power to the air conditioner when your electronics enclosure door is
open allowing you to work on your enclosure without the risk of unintentionally powering the unit.
Adjustable Temperature Probe
The adjustable temperature probe provides you with a 5’ temperature probe that can be installed
anywhere in your enclosure. This allows you to have the flexibility to monitor and maintain the
temperature at any specific location of your enclosure.
Ethernet/IP Controller Output
This option provides the ability to communicate with the ISC Air Conditioner controller via the
Ethernet/IP protocol. You can monitor and control all settings from a remote location with a PLC.
Full specifications will be provided with this option. For full details refer to the Ethernet/IP Option
Specifications included with the Air Conditioner.
Outdoor Option
When having our Programmable Digital Controller on the face of our Air Conditioner does not fit your
application, ISC offers the OD Package (i.e. Outdoor Option). This option moves the controller into
your enclosure using a 10’ cable along with a universal, 16 gauge powder coated steel mounting
bracket. The Air Conditioner will have no openings on the face of the unit. Below is partial schematic
showing the OD option wiring connections to the digital controller.
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System Faults
If any of the critical control parameters exceed limits, the compressor is turned off and an alarm
condition is indicated on the front panel.
There are three main conditions that can shut the AC compressor down:
• The condenser high temperature alarm
• The evaporator coil alarm
• The compressor thermal overload
In the event that the condenser coil overheats, a condenser high temperature alarm, HA2, will flash on
the display of the digital temperature controller and the compressor will turn off after a 3 minute time
delay.
In the case that the evaporator coil ices up or there is a leak, an evaporator coil alarm, CA, will flash
on the display of the digital temperature controller and the compressor will turn off after a 2 minute
time delay.
A thermal overload protects the compressor against faults. In the event that the snowflake status LED
is not flashing on the display and the compressor is not running, an internal fault may have occurred
on the unit. Refer to the Troubleshooting Guide in this manual.
Digital Temperature Controller Programming
For the end user this section will provide all the necessary information to view and change all functions
and parameters available to you.
HOW TO SEE THE SETPOINT……..
1. Pr ess and immediate ly release the SE T ke y. The display wil l show the se tp oi nt value.
2. Pr ess and immediate ly release the SE T ke y or wa it f or 15 se conds to display th e enclosure tem pera tu re
again.
HOW TO CHANGE THE SETPOINT……..
N ote: The set valu e is stored eve n wh en the proc ed ur e is exited by wa it in g for the time-ou t to e xpire.
1. Pr ess the SET key f or m ore than 2 se co nds to change t he s et point value .
2. The value o f th e se tpoint wi ll be di sp la yed and the “ F” LED s ta rts blinking.
3. To c hange the S ET value, pre ss the U P or DOWN arrow k ey within 1 5 se co nds.
4. To s tore the new setpoint valu e, p re ss t he SET key ag ain or wait 15 second s.
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HOW TO ACCESS HIDDEN MENU 1……..
1. En ter the Progr am mi ng m ode by pr es si ng t he SET + DOWN a rrow keys s im ultane ously for 3 seconds .
The “F” LED starts bl in ki ng.
2. Se lect t he requir ed parameter by p re ss in g the UP or DOW N arrow key. Pre ss t he S ET key to dis pl ay
it s value.
3. Us e the UP or DOW N ar ro w key to chan ge its value.
4. Press SET to store the new value and move to the following parameter.
N ote: The set valu e is stored eve n wh en the proc ed ur e is exited by wa it in g for the time-ou t to e xpire.
To exit: Press SET + UP arrow keys or wait 15 seconds without pressing a key.
HOW TO ACCESS HIDDEN MENU 2……..
N ote: The set valu e is stored eve n wh en the proc ed ur e is exited by wa it in g for the time-ou t to e xpire.
1. En ter the Progr am mi ng m ode by pr es si ng t he SET + DOWN a rrow keys s im ultane ously for 3 seconds .
The “F” LED starts bl in ki ng.
2. Release the k ey s, t he n push the SE T + DOWN arrows k ey s simultaneou sl y, a gain for more tha n 7
se co nds.
The Pr2 label w ill be displayed im medi at el y followe d by t he HY param eter .
3. Se lect t he requir ed parameter by p re ss in g the UP or DOW N arrow key. Pre ss t he S ET key to dis pl ay
it s value.
4. Us e the UP or DOW N ar ro w key to chan ge its value.
5. Press SET to store the new value and move to the following parameter.
To exit: Press SET + UP arrow keys or wait 15 seconds without pressing a key.
HOW TO LOCK THE KEYPAD……..
1. Pr ess and hold th e UP a nd DOWN arr ow k eys simultaneou sl y for more than 3 s ec onds.
2. The POF message will be displaye d an d the keyboard wi ll be lock ed.
At t his point, it w ill be possible o nl y to see the setpoi nt o r the MAX o r MIN temperature s to red.
3. If a k ey is pressed f or m ore than 3 se co nds the POF m es sa ge will b e di sp la ye d.
HOW TO UNLOCK THE KEYPAD……..
1. Pr ess and hold th e UP + DOWN arr ow k eys simu lt aneously fo r mo re than 3 s ec on ds u ntil the Po n
F unctions and Pa rameters
me ss age is displa ye d.
Fu nc tion Op er ation Pa ra me te r
Co oling Setpo in t
Se t Desired C oo li ng
Te mp erature
Me nu
Lo cation
SE T Ma in 90 70 - 95 °F
Fa ctory
De fault
Op er ating
Ra ng e
Un it
Co oling
Di fferentia l
Co mp ressor
Pr otection
Pr obed Disp layed
Au xiliary
Se tpoint
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Co ntrol Hys teresis Hy
An ti short-cy cl e de la y AC
Se lect Disp lay Probe
P1 – Enclosur e Temper at ur e
P2 – Conden ser Temper at ur e
Se tpoint fo r D ry Contac t
/ He ater
*1
Hi dden
Me nu 1
Hi dden
Me nu 2
Lo d
SA A
Hi dden
Me nu 2
Hi dden
Me nu 2
SP-ENG-211-100-11 R ev 1 .0 14 | P a g e
5 1 - 4 5 °F
5 0 - 5 0 mi n
P1 P 1 / P2 N/A
10 5 / 55 -6 7 - 302 °F
Fu nc tion Op er ation Pa ra me te r
Au xiliary
Di fferentia l
Ma ximum
Te mp erature
Al arm
Minimum
Te mp erature
Alarms Signals
Al arm
*1
No te: When both Heater and Dry Contac t op ti ons are inclu ded, these p ar am eters only co nt ro l He at er
Se tt ings. Dry Co nt ac t is contro lled by ALU.
Me ss ag e Ca use Ou tputs
“P 1” En closure Pro be F ai lu re
“P 2” Condens er Probe F ai lu re
“H A”
“L A”
“H A2 ”
Co ndenser H ig h Te mp erature Alarm: P2 > 1 45°F for
He ater or Dry C on ta ct
Hy steresis *1
Al erts with “ HA ” wh en
ma xi mum tempera tu re has
be en exceeded
Al erts with “ LA ” wh en
mi nimum tem perature h as
be en exceeded
Ma ximum Tempera tu re Alarm: P1 > 10 5°F for 3
minutes (after initial 30 min. start up delay)
Minimum Tempe ra tu re Alarm: P 1 < 45°F for 3
minutes (after initial 30 min. start up delay)
3 minutes
Sh y
AL U
AL L
Me nu
Lo cation
Hi dden
Me nu 2
Hi dden
Me nu 2
Hi dden
Me nu 2
St art and sto p of the com pr es so r after 15 mi nu te
Fa ctory
De fault
3 1 - 4 5 °F
10 5 45 - 302 °F
45 -67 - 10 5 °F
No Output
No Output
No Output
Co mp ressor Off
Op er ating
Ra ng e
in tervals *2
*2
*2
*2
*2
Un it
“L A2 ”
“C A” Evapora to r Co il Alarm: Low P re ss ure for 2 m in ut es
“n oP” Invali d Pr ob e Selected: Low Eva porator Coil No Output, Di splay On ly
*2
ac tivated.
Co ndenser L ow Tempera ture Ala rm: P2 < 5 0°F for 3
minutes
No te: When both Heater and Dry Contac t op ti ons are inclu ded, Dry C on ta ct ( Alarm Con tact) Relay is
No Output
Co mp ressor Off
*2
*2
ALARM RECOVERY……..
If t he compressor i s tu rned off du e to a n alarm, it wil l be able to restart af te r th e AC an ti s ho rt-cycle time delay .
(P arameter AC = 5mi nu tes)
Probe alarm P1 is cleared with no time delay after the fault is cleared.
Probe alarm P2 starts and stops with no time delay.
Temperature alarm HA automatically clears as soon as the temperature returns to below 105°F (the ALU setpoint) -2°F = 103°F.
Temperature alarm LA automatically clears as soon as the temperature returns to above 55°F (the ALL setpoint) +2°F = 47°F.
Temperature alarm HA2 automatically clears as soon as the condenser coils temperature returns to below 135°F.
Temperature alarm LA2 automatically clears as soon as the condenser coils temperature returns to above 60°F.
Temperature alarm CA automatically clears as soon as the pressure returns to normal.
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SP-ENG-211-100-11 R ev 1 .0 15 | P a g e
Preventative Maintenance
Air conditioners require regular cleaning of the condenser air inlet filter. Wash filter often if washable
using proper cleaning compound and back flushing the dirt out, or replace if not washable whenever it
appears physically dirty. Restriction to the flow of air over the condenser coil will degrade the
performance of the equipment, cause it to overheat, reduce cooling and can damage the compressor.
The overload switch in the compressor may cause the compressor to cycle if the condensing coil
pressure becomes too high due to air restriction. A further safety feature is the refrigerant high
pressure cut off switch which will stop the compressor if the condensing pressure becomes too high
due restricted condenser air flow or some other cause.
Restricted air flow due to neglecting a dirty filter will cause unit to repeatedly turn off and then turn
back on after it cools off.
void the warranty.
An operation in this safety cycling mode will eventually damage the equipment and
Refer to Field Serviceable Parts section in this manual for details on parts that can be changed to help
increase the uninterruptable life of the Air Conditioner.
Air Filter Service
Remove the air conditioner filter and wash if washable or replace if not washable. Dry thoroughly
before replacing. ISC Air Filter Treatment Spray in aerosol cans or spray bottle is recommended to
enhance air filter efficiency. Replacement filters are readily available from ISC Customer Service. DO
NOT operate the air conditioner without the air filter. Such operation will allow the condenser coil to
become dirty and loose efficiency, causing overheating and diminished cooling capacity. Dirty
condensing coils must be back-flush cleaned using proper commercial coil cleaning compounds and
thorough back-flush rinsing. Refer to directions on the cleaning compounds selected. Acid wash is not
recommended as it reduces the life of the coil.
Note: Do not use solvents to clean the programmable thermostat. Wipe with mild soap and water.
Condenser and Evaporator Fans
ISC air conditioners use high efficiency, long life, sealed ball bearing fans engineered for optimum
performance that require no maintenance. Keep fan blades clean for optimal performance. Fans are
removable and attached by plug in connections.
Compressor
ISC uses hermetically factory sealed compressors that are quiet, low vibration and are maintenance
free. Thermal overload devices are installed to protect the compressor from damage due to overheat
and short cycle faults. If the compressor thermal overload fails, it is recommended to return the unit to
ISC customer service for proper replacement. Note that the rotary compressor runs with compressed
refrigerant gas on the outer case and therefore is hot to the touch.
Loss of Refrigerant
ISC air conditioners are meticulously leak and run tested after assembly. If a leak in the system
should develop due to shipping damage or mechanical vibration, the leak must be detected, repaired
and the refrigerant charge restored to the system by a qualified refrigeration professional.
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 16 | P a g e
Field Serviceable Parts
ISC carefully designs and selects components with the maximum life expectancy. Due to OEM
manufacturing tolerances, poor unit maintenance or extreme operating conditions, components may
fail before their maximum life expectancy. The table below lists parts that are serviceable in the field by
an Air Conditioner Technician.
Pa rt Descriptio n IS C Part #
Di gital Con troller
Lo w Pressure Sw it ch 38 15 1- 1
Co ndenser F an Cut-In Pr es su re S wi tch 38001-1
Te mp erature P ro be 52 12 6- 1
Co ndenser F an Relay
Th ermal Expan si on V alue TXV
Co mp ressor
Co mp ressor Th er ma l Ov er load In ternal
Ga sket Installa ti on K it 71 40 5- HC 20
Ev aporator Fa n 41 06 2- 2- 1
Co ndenser F an 41 06 0- 2- 1
Fi lt er Medi a 44 01 3- 1
Ca pa citor
Co ntactor Rel ay 55 76 5- 1
Safety Information
Unit is carefully designed to restrict access to movable parts to minimize any potential injury. This Air
Conditioner has been tested by UL to meet the safety requirements of the UL484 specification. When
working with the ISC Air Conditioner always makes sure shroud is installed. Verify proper voltage is
applied to unit as specified in the UL label of the Air Conditioner. In the event of a field service repair,
power down unit using the power on/off switch and disconnect power from unit. It is always
recommended to use a licensed Air Conditioner Technician for internal diagnostics and repairs issues.
Contact ISC technical support for further details on opening the unit and troubleshooting tips.
52 11 2- 1
52 11 1- 2 w/ both D ry C and Heater
55 76 2- 1
HC 20 1: 32008-1
HC 20 1: 31040-1
HC 20 1: 54006-1
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 17 | P a g e
Po we r Cord
then Retry
technical s upport
In su fficien t Cooling
Fi lt er
Fa n & replace
Co il dirty?
Fr ozen / Ic ed?
fa n.
resolved cont ac t te chnical sup port .
Troubleshooting Guide
The following guide provides a flow chart to identify a problem, determine the root cause and identify
the action needed to correct an issue.
Un it Will N ot R un Is Uni t
Co nnected?
N O
Pl ease Connec t
Un it Overheats /
Is F ilter
Cl ean?
Cl ean / Rep lace
Is E vaporator C oi l
N O
Y ES
Po tential Bad
Ev aporator Fa n,
ch eck for fau lty
N O
YE S
N O
Ve ri fy Powe r On/Off
Sw itch is on po si ti on
O FF
To gg le Switch
YE S
Te chnician to check Ref ri ge rant P ressure. U ni t
ma y have a re frigeratio n le ak. If problem i s no t
Ar e Condenser &
Ev aporator Fa ns O N?
N O
Ch eck for Fau lt y
Co ntact Qua lified Refri ge ra ti on S ervice
ON
Ve ri fy inpu t power
me ets voltage
requ irements as
sh own in the UL l ab el
Y ES
If problem is s ti ll p resent contac t
YE S
Is C ondenser
Y ES
Cl ean Coil
N O
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 18 | P a g e
Un it Not Cool ing
On ?
am bient?
me ter.
po wer?
YE S
*3
Is C ompress or
YE S
Is evaporator
Fa n on?
N O
Ch eck
Se tpoint. Is
Se tpoint
be low
YE S
Is snowflake
LE D lit on
controller?
N O
N O
Se t Setpoint between
70 to 95 deg F
Ch eck for err or c od e
C A, LA ,H A,LA2,HA2,
P1 , or P2
N O
YE S
Co ntact Cus tomer
Su pport
Refer to Al arm Signal s
in D igital Te mp er at ur e
Co ntroller
Pr og ramming Sec ti on
Is compressor
thermal overloa d
op en? Use o hm
3
YE S
Replace T hermal
Ov erload.
N O
Co ntact Cus tomer
Su pport
No te: Refer to El ectrical S chematics for furt her diag nostics.
YE S
N O
YE S
N O YE S
Ve ri fy contac t coil is
be ing activat ed. Check
connectivity3, if i ss ue
pe rs ists compon en t
replacement m ay b e
ne eded.
Me asure Tem perature a t Evaporator
& Verify He at L oa d Requirements. Is
un it capacity a de quate for internal
he ad load? Po ss ib le low refrigerant.
Ch eck for fau lt y
Is there volt ag e to
compressor? Use
N O
Ch eck contactor
circuit. Does i t ha ve
3
YE S
3
3
Co ntact
Cu stomer
Su pport
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 19 | P a g e
Fl as hing Error
Co des
*3
Fu se / Circuit
Pr ot ec tion
Nu isance Trip
Si ng le or
Mu ltiple
Co des?
1
CA
NO
P1 o r
P2
NO
LA , LA2, HA,
HA 2
No te: Refer to El ectrical S chematics for furt her diag nostics.
Is fuse opening a s
so on as unit tu rn s
on ?
NO
Do es fuse o pe n
wh en compress or
starts?
YE S
YE S
2 +
Ch eck Low P ressure
Sw itch Connecti on s
an d Verify Pr es su re
sw itch is clo se d. Us e
connections, po te nt ia l
YE S
P1 / P 2
combination
flashing?
3
me ter.
Ch eck probe
fa ulty prob e.
Refer to Al arm Signal s
in D igital Te mp er at ur e
Co ntroller
Pr og ramming Sec ti on
YE S
YE S
NO
Ve ri fy prop er recommend ed f us e
Po tential bad
YE S
NO
Ch eck incomin g po we r
su pply and co nn ec ti ons
for potential s ho rt c ircuit
Ch eck elect rical specific at io n.
ha s been sele ct ed .
Ch eck compres so r, i f ex cess heat p re sent compressor m ay
be faulty. C on ta ct Technical Suppor t.
connection. Check
gr een conne ctor
be hind contro ll er .
Refer to Al arm Signal s
in D igital Te mp er at ur e
Co ntroller
Pr og ramming Sec ti on
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 20 | P a g e
Wa te r overflow /
ex ce ss iv e
Physical Dimensions
230 VAC Models
En sure air tigh t
se al betw een air
cond itioner a nd
en closure. Mak e
Ch eck drain, is i t
pl ugged?
YE S
Cl ean conde nsate pa n and
dr ain; add 1 tb sp b leach to
up per pan m onthly to kill
NO
Is A ir Conditio ne r sealed
ag ai nst enc losure
pr operly, tig htly seale d
an d door clos ed ?
YE S
Co ntact Cus tomer Se rvice
NO
su re door i s
closed.
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 21 | P a g e
480 VAC Models
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 22 | P a g e
Electrical Schematics
System Schematic
Digital Controller Schematic
Note: Schematics applies to all voltages; optional accessories wiring not provided in this document. If you
require electrical schematic with options contact our technical support and provide your model number.
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 23 | P a g e
Warranty Information
ISC products are warranted to be free of defects in workmanship, materials and components. The
warranty period applies from date of shipment for one year.
The above warranty applies when the equipment is operated under the following conditions:
• Ambient temperature not in excess of performance rating in normal atmosphere or as stated on
product nameplate
• Voltage variation no greater than ± 10% from nameplate rating
• Frequency variation no greater than ± 3Hz from nameplate rating
• Maximum cooling load no higher than air conditioner nameplate rating
• Waiting five minutes before restarting air conditioner after intentional or accidental shutoff
• Compliance to all other installation, maintenance and operating instructions, as supplied
ISC cannot assume responsibility for misapplication of its products or the erroneous selection of an
inappropriate product by a non-authorized ISC representative. Our applications engineers will gladly
assist in the selection of the proper product provided all required details of the application are furnished.
ISC assumes no liability beyond the repair or replacement of its own product. This Warranty does not
cover:
• Labor or reimbursement of labor for evaluation, removal, installation, repair, or cost of any
warranted part, except at the ISC factory in Dallas, Texas
• Use of equipment for other than its designed purpose or operating conditions
• Operation in harsh, oily, corrosive or other abnormal environmental conditions, without the proper
filtration, sealing, protective coatings and/or weather protection
• Damage to hermetic system resulting from continuous operation with dirty or clogged air filters or
improper or negligent maintenance
• Use of refrigerant other than designated
• Customer modification or abuse
• Shipping damage or other accident
• Repair or service by unauthorized personnel.
Cracked or broken hermetic tubing or brazed joints caused by shipping damage or mishandling are not
covered under the Warranty. Claims for shipping damage are the responsibility of the Consignee. Timely
claims must be filed with the freight carrier.
The purchaser assumes the responsibility of grounding the unit and installing it in accordance with local
electrical and safety codes, as well as the 2008 National Electric Code (NEC) and OSHA.
THIS WARRANTY CONSTITUTES THE ENTIRE WARRANTY WITH RESPECT TO THE PRODUCT AND
IS IN LIEU OF ALL OTHERS, EXPRESSED OR IMPLIED, INCLUDING ANY WARRANTY OF
MERCHANTABILITY AND WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE AND IN NO
EVENT IS ISC RESPONSIBLE FOR ANY CONSEQUENTIAL DAMAGES OF ANY NATURE
WHATSOEVER.
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 24 | P a g e
Return Material Authorization (RMA) Procedure
All returns require a Return Material Authorization (RMA) number for warranty or non-warranty repair, rotation
of stock, damage or any other reason.
IMPORTANT
Returns without an RMA number will be refused and returned. Improper packaging may void
warranty. Air Conditioners shipped laying down will void the warranty. Collect shipments will be
refused. Returns received after 60days will be refused and RMA will be canceled.
Please be ready to provide:
• Purchase Order Number & Date
• Product Description & Reason for Request
• Model Number & Serial Number
• Customer name and contact info (email, phone number and address)
• Shipping method
Pack unit in a suitable packing for shipment, preferably the original packaging if available.
• If suitable packing is not available, arrange for packaging to be shipped to you.
• Air Conditioners must be returned in an upright position properly secured to a pallet.
• Tip unit to empty water from the evaporator and boil off pans.
• Clearly mark the RMA number on the box.
• Customer will pay all freight charges.
Out of Warranty Repair
If your ISC air conditioner is out of warranty and requires repair, simply call ISC Customer Service at (800)836-7472 for an RMA number. Customer Service will help you determine what repairs or parts are needed
and, if possible, an estimate of the cost.
After the unit is received and diagnosed, you will receive a ship estimate on the work and parts needed. The
repairs and test process may uncover other issues for which you will be informed and given quotes for the
work needed.
4421 Tradition Trail ● Plano, Te xas 75093 ● 972-964-2700 ● 800-836-7472
URL: www.iscenclosure cooling.com ● Email: iscinfo@iscsales.com
SP-ENG-211-100-11 R ev 1 .0 25 | P a g e
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