Thermal Edge NE020 User manual

User & Technical Manual
NE020, NE030, & NE040 Series
Rev 2.2

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
URL: www.thermal-edge.com ● Email: [e-mail]
SP-ENG-210-000-06 Rev 2.2 2 |P a g e
Title: NE020, NE030, & NE040 Air Conditioner Technical Manual
Department: Engineering
Objective: To provide important information for maintenance, diagnostics and advance operations of the
Thermal Edge NE020, NE030 & NE040 Series Air Conditioners.
Revision History:
Rev
Date
Owner
Description of Changes
1.0
09-22-10
G. Gonzalez
New Format Initial Release
1.2
12-01-10
G. Gonzalez
Update Unit Specification Section for SCCR, Update Preliminary
Test Section and Controller Section for Heater Set point Defaults
1.3
12-05-11
G. Gonzalez
Update Schematic Section & specs for max ambient
1.4
03-05-12
B. Slotnick
Update filter media part number
1.5
01-14-13
B. Slotnick
Revise mounting procedure
1.6
02-22-13
B. Slotnick
Added power connector
1.7
08-17-13
B. Slotnick
Added Appendix A
1.8
01-15-14
B. Slotnick
Update Adjustable Temperature Probe length
1.9
04-03-14
B. Slotnick
Update email address
2.0
08-04-14
B. Slotnick
Delete Celsius programming flash drive key
2.1
01-22-15
B. Slotnick
Update system schematic
2.2
03-23-15
B. Slotnick
Parts list: Added high pressure switch; updated filter information
Statement of Confidentiality
The Manual and other materials contain proprietary information, comprising Thermal Edge 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 Thermal Edge Inc.’s written approval.
Thermal Edge 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 Thermal Edge
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.

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
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SP-ENG-210-000-06 Rev 2.2 3 |P a g e
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
Appendix A –Power Connector 26

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
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SP-ENG-210-000-06 Rev 2.2 4 |P a g e
Overview
Thank you for your purchase of the Thermal Edge Special Purpose Air Conditioner. Our air
conditioning equipment is carefully designed to cool and dehumidify the air in electronic component
enclosures. Thermal Edge has designed air conditioners for all types of electronic equipment
enclosures providing capacity from 1,000 to 20,000 BTUH.
This manual will guide you through the installation, maintenance, diagnostics and advance operations
of the NE020, NE030 & NE040 Series Air Conditioners. This manual contains important information
for the end-user who installs, maintains and/or operates the NE020, NE030 & NE040 Air Conditioner.
Technical Support
By Phone: [phone]
(Monday –Friday, 7:30 am –5:00 pm Central Time)
By Email: [e-mail]
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
Thermal Edge 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 ensure that there is no visual or hidden damage.
Upon receipt of the equipment, ensure that it is always top side up as indicated by “THIS SIDE UP”
labels. This ensures 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 ensure 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.

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
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SP-ENG-210-000-06 Rev 2.2 5 |P a g e
Moving the Air Conditioners
Read this section completely before running or installing your Thermal Edge 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: Thermal Edge 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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SP-ENG-210-000-06 Rev 2.2 6 |P a g e
Operation
Thermal Edge 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.
Thermal Edge air conditioners operate as a “closed loop” system with no exposure or introduction of
outside air. This ensures 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.
Thermal Edge 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 Thermal Edge 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 2008 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.
Connect a power source to the air conditioner 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.

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SP-ENG-210-000-06 Rev 2.2 7 |P a g e
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.
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 ensure an air tight closed loop seal. Be cautious not to let any cutting debris fall
into the enclosure.
Hang the air conditioner on the Easy Hang Tabs and from inside the enclosure use the fasteners
supplied to attach the air conditioner to the enclosure. Ensure that these fasteners are tight in order to
prevent the unit from falling off the enclosure. These fasteners should be checked periodically to
ensure that they have not become loose due to vibration.
The air conditioner is provided with a power cord or a power terminal block. Ensure that the power
supplied is compatible with the air conditioner’s power requirements. Properly connect the unit to a
power circuit that meets the equipment requirements and provide a circuit protection device based on
the Unit Specifications section of this manual. See Appendix A for Phoenix Contact power connector
instructions.
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-210-000-06 Rev 2.2 8 |P a g e
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). Ensure
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 NE020, NE030 & NE040
Series Air Conditioners.
NE020Series
Nominal Capacity Rating: 2,000 BTUH
Standard Maximum Ambient: 125°F
Unit Weight: 99lbs (120/230VAC) / 123lbs (480VAC)
Model
Operating
Voltage
Range
(Volts)
Inrush
Current
(Start
Up
Current)
(Amps)
Loading
Current
(Running
Current)
(Amps)
SCCR
(Short
Circuit
Current
Rating)
(Amps)
Recommended
Fuse Selection
(Amps)
KVA Rating
(K-Watts)
Refrigerant
Type
Refrigerant
Amount
(ounces)
Low/High
Unit
Pressures
(psi)
NE020126
110-120
16.42
3.76
*2
8 Amp Class
CC, CCMR
Time Delay *
0.5
R422d
10.25
188 / 300
NE020236
220-240
13.41
3.07
*2
6 Amp Class
CC, CCMR
Time Delay *
0.7
R422d
9.75
188 / 300
NE020486
440-480
4.11
0.93
160K
2 Amp Class
CC, CCMR
Time Delay *
0.5
R422d
10.25
188 / 300
* Time-delay Fuses with the following electrical characteristics are recommended. Fast-acting fuses
are not recommended.
% of Ampere Rating
Opening Time
110 %
15min Minimum
125 %
1hr Maximum
200 %
12sec Minimum
4min Maximum
*2 SCCR rating is based on the SCCR rating for the circuit protection device installed in the panel /
enclosure per UL50 & UL508a to protect the AC unit. Typically 100KA –200KA for Time-Delay Fuses.

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SP-ENG-210-000-06 Rev 2.2 9 |P a g e
NE030 Series
Nominal Capacity Rating: 3,000 BTUH
Standard Maximum Ambient: 125°F
Unit Weight: 99lbs (120/230VAC) / 123lbs (480VAC)
Model
Operating
Voltage
Range
(Volts)
Inrush
Current
(Start
Up
Current)
(Amps)
Loading
Current
(Running
Current)
(Amps)
SCCR
(Short
Circuit
Current
Rating)
(Amps)
Recommended
Fuse Selection
(Amps)
KVA Rating
(K-Watts)
Refrigerant
Type
Refrigerant
Amount
(ounces)
Low/High
Unit
Pressures
(psi)
NE030126
110-120
23.42
5.15
*2
12 Amp Class
CC, CCMR
Time Delay *
0.7
R422d
10.25
188 / 300
NE030236
220-240
13.65
3.07
*2
7 Amp Class
CC, CCMR
Time Delay *
0.7
R422d
9.75
188 / 375
NE030486
440-480
5.86
1.51
160K
3 Amp Class
CC, CCMR
Time Delay *
0.75
R422d
10.25
188 / 300
NE040 Series
Nominal Capacity Rating: 4,000 BTUH
Standard Maximum Ambient: 125°F
Unit Weight: 99lbs (120/230VAC) / 123lbs (480VAC)
Model
Operating
Voltage
Range
(Volts)
Inrush
Current
(Start
Up
Current)
(Amps)
Loading
Current
(Running
Current)
(Amps)
SCCR
(Short
Circuit
Current
Rating)
(Amps)
Recommended
Fuse Selection
(Amps)
KVA Rating
(K-Watts)
Refrigerant
Type
Refrigerant
Amount
(ounces)
Low/High
Unit
Pressures
(psi)
NE040126
110-120
23.42
5.53
*2
12 Amp Class
CC, CCMR
Time Delay *
0.7
R422d
10.25
188 / 345
NE040236
220-240
13.65
3.07
*2
7 Amp Class
CC, CCMR
Time Delay *
0.7
R422d
9.75
188 / 375
NE040486
440-480
5.86
1.51
160K
3 Amp Class
CC, CCMR
Time Delay *
0.75
R422d
10.25
188 / 345
* Time-delay Fuses with the following electrical characteristics are recommended. Fast -acting fuses
are not recommended.
% of Ampere Rating
Opening Time
110 %
15min Minimum
125 %
1hr Maximum
200 %
12sec Minimum, 4min Maximum
*2 SCCR rating is based on the SCCR rating for the circuit protection device installed in the panel /
enclosure per UL50 & UL508a to protect the AC unit. Typically 100KA –200KA for Time-Delay Fuses.

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SP-ENG-210-000-06 Rev 2.2 10 |P a g e
Options
The NE020, NE030 & NE040 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.
Default Settings:
55°F Heat Set Point
3°F Differential
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:
105°F Dry Contact High Temperature Alarm Set Point
2°F Recovery Differential
3min Temperature Alarm Delay
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.

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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 Thermal Edge Air Conditioner in SI units.
This feature can be programmed into the digital temperature controller at time of manufacturing.
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:
55°F Heat Set Point
3°F Differential
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 Thermal Edge 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 125°F. With this option we can optimize the Air Conditioner during
manufacturing to achieve improved performance at high ambient conditions.

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Open Door Kill Switch
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 12’ 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 Thermal Edge 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, Thermal Edge 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. Press and immediately release the SET key. The display will show the setpoint value.
2. Press and immediately release the SET key or wait for 15 seconds to display the enclosure temperature
again.
HOW TO CHANGE THE SETPOINT……..
1. Press the SET key for more than 2 seconds to change the setpoint value.
2. The value of the setpoint will be displayed and the “F” LED starts blinking.
3. To change the SET value, press the UP or DOWN arrow key within 15 seconds.
4. To store the new setpoint value, press the SET key again or wait 15 seconds.
Note: The set value is stored even when the procedure is exited by waiting for the time-out to expire.

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HOW TO ACCESS HIDDEN MENU 1……..
1. Enter the Programming mode by pressing the SET + DOWN arrow keys simultaneously for 3 seconds.
The “F” LED starts blinking.
2. Select the required parameter by pressing the UP or DOWN arrow key. Press the SET key to display
its value.
3. Use the UP or DOWN arrow key to change its value.
4. 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.
Note: The set value is stored even when the procedure is exited by waiting for the time-out to expire.
HOW TO ACCESS HIDDEN MENU 2……..
1. Enter the Programming mode by pressing the SET + DOWN arrow keys simultaneously for 3 seconds.
The “F” LED starts blinking.
2. Release the keys, then push the SET + DOWN arrows keys simultaneously, again for more than 7
seconds.
The Pr2 label will be displayed immediately followed by the HY parameter.
3. Select the required parameter by pressing the UP or DOWN arrow key. Press the SET key to display
its value.
4. Use the UP or DOWN arrow key to change 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.
Note: The set value is stored even when the procedure is exited by waiting for the time-out to expire.
HOW TO LOCK THE KEYPAD……..
1. Press and hold the UP and DOWN arrow keys simultaneously for more than 3 seconds.
2. The POF message will be displayed and the keyboard will be locked.
At this point, it will be possible only to see the setpoint or the MAX or MIN temperature stored.
3. If a key is pressed for more than 3 seconds the POF message will be displayed.
HOW TO UNLOCK THE KEYPAD……..
1. Press and hold the UP + DOWN arrow keys simultaneously for more than 3 seconds until the Pon
message is displayed.
Functions and Parameters
Function
Operation
Parameter
Menu
Location
Factory
Default
Operating
Range
Unit
Cooling Setpoint
Set Desired Cooling
Temperature
SET
Main
90
70 - 95
°F
Cooling
Differential
Control Hysteresis
Hy
Hidden
Menu 1
5
1 - 45
°F
Compressor
Protection
Anti short-cycle delay
AC
Hidden
Menu 2
5
0 - 50
min
Probed Displayed
Select Display Probe
P1 –Enclosure Temperature
P2 –Condenser Temperature
Lod
Hidden
Menu 2
P1
P1 / P2
N/A
Auxiliary
Setpoint
Setpoint for Dry Contact *1
/ Heater
SAA
Hidden
Menu 2
105 / 55
-67 - 302
°F

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SP-ENG-210-000-06 Rev 2.2 15 |P a g e
Function
Operation
Parameter
Menu
Location
Factory
Default
Operating
Range
Unit
Auxiliary
Differential
Heater or Dry Contact
Hysteresis *1
Shy
Hidden
Menu 2
3
1 - 45
°F
Maximum
Temperature
Alarm
Alerts with “HA” when
maximum temperature has
been exceeded
ALU
Hidden
Menu 2
105
45 - 302
°F
Minimum
Temperature
Alarm
Alerts with “LA” when
minimum temperature has
been exceeded
ALL
Hidden
Menu 2
45
-67 - 105
°F
*1Note: When both Heater and Dry Contact options are included, these parameters only control Heater
Settings. Dry Contact is controlled by ALU.
Alarms Signals
Message
Cause
Outputs
“P1”
Enclosure Probe Failure
Start and stop of the compressor after 15 minute
intervals *2
“P2”
Condenser Probe Failure
No Output *2
“HA”
Maximum Temperature Alarm: P1 > 105°F for 3
minutes (after initial 30 min. start up delay)
No Output *2
“LA”
Minimum Temperature Alarm: P1 < 45°F for 3
minutes (after initial 30 min. start up delay)
No Output *2
“HA2”
Condenser High Temperature Alarm: P2 > 145°F for
3 minutes
Compressor Off *2
“LA2”
Condenser Low Temperature Alarm: P2 < 50 °F for 3
minutes
No Output *2
“CA”
Evaporator Coil Alarm: Low Pressure for 2 minutes
Compressor Off *2
“noP”
Invalid Probe Selected: Low Evaporator Coil
No Output, Display Only
*2Note: When both Heater and Dry Contact options are included, Dry Contact (Alarm Contact) Relay is
activated.
ALARM RECOVERY……..
If the compressor is turned off due to an alarm, it will be able to restart after the AC anti short-cycle time delay.
(Parameter AC = 5minutes)
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.

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
URL: www.thermal-edge.com ● Email: [e-mail]
SP-ENG-210-000-06 Rev 2.2 16 |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. An operation in this safety cycling mode will eventually damage the equipment and
void the warranty.
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. THERMAL EDGE Air Filter Treatment Spray in aerosol cans or spray bottle is
recommended to enhance air filter efficiency. Replacement filters are readily available from THERMAL
EDGE 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
Thermal Edge 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
Thermal Edge 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 Thermal Edge 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
Thermal Edge 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.

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
URL: www.thermal-edge.com ● Email: [e-mail]
SP-ENG-210-000-06 Rev 2.2 17 |P a g e
Field Serviceable Parts
Thermal Edge 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.
Part Description
Thermal Edge Part #
Digital Controller
52110-1 for 120VAC/480VAC
52112-1 for 230VAC
52111-1 for 120VAC/480VAC w/ both Dry C and Heater
52111-2 for 230VAC w/ both Dry C and Heater
Low Pressure Switch
38151-1
High Pressure Switch
38176-1
Condenser Fan Cut-In Pressure Switch
38001-1
Temperature Probe
52126-1
Condenser Fan Relay
55761-1 for 120VAC/480VAC
55762-1 for 230VAC
Thermal Expansion Value TXV
NE020 120VAC Only = 32006-1, NE020 230VAC/NE030/NE040 = 32002-1
Compressor
NE020 = 31520-1 for 120VAC/480VAC, 31570-1 for 230VAC
NE030/NE040 = 31525-1 for 120VAC/480VAC, 31570-1 for 230VAC
Compressor Thermal Overload
NE020 = 31520-2 for 120VAC/480VAC, 31570-2 for 230VAC
NE030/NE040 = 31525-2 for 120VAC/480VAC, 31570-2 for 230VAC
Gasket Installation Kit
71401-N234
Evaporator Fan
41005-1-1 for 120VAC/480VAC
41005-2-1 for 230VAC
Condenser Fan
41025-1-1 for 120VAC/480VAC
41025-2-1 for 230VAC
Filter Media
44202 (12 pack)
Capacitor
54001-1
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 Thermal Edge 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 Thermal Edge technical support for further details on opening the unit and troubleshooting
tips.

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
URL: www.thermal-edge.com ● Email: [e-mail]
SP-ENG-210-000-06 Rev 2.2 18 |P a g e
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.
Unit Will Not Run
Is Unit
Connected?
YES
NO
Please Connect
Power
Verify Power On/Off
Switch is on position
ON
OFF
Toggle Switch
then Retry
Verify input power
meets voltage
requirements as
shown in the UL label
YES
If problem is still present contact
technical support
Unit Overheats /
Insufficient Cooling
Is Filter
Clean?
NO
Clean / Replace
Filter
YES
Are Condenser &
Evaporator Fans ON?
NO
Check for Faulty
Fan & replace
YES
Is Condenser
Coil dirty?
YES
Clean Coil
NO
NO
Is Evaporator Coil
Frozen / Iced?
YES
Potential Bad
Evaporator Fan,
check for faulty
fan.
NO
Contact Qualified Refrigeration Service
Technician to check Refrigerant Pressure. Unit
may have a refrigeration leak. If problem is not
resolved contact technical support.

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
URL: www.thermal-edge.com ● Email: [e-mail]
SP-ENG-210-000-06 Rev 2.2 19 |P a g e
*3Note: Refer to Electrical Schematics for further diagnostics.
Unit Not Cooling
Is Compressor
On?
YES
NO
Check
Setpoint. Is
Setpoint
below
ambient?
YES
NO
Is snowflake
LED lit on
controller?
Set Setpoint between
70 to 95 deg F
YES
NO
Is evaporator
Fan on?
YES
NO
Is there voltage to
compressor? Use
meter3
Check for faulty
evaporator fan3
Measure Temperature at Evaporator
& Verify Heat Load Requirements. Is
unit capacity adequate for internal
head load? Possible low refrigerant.
Is compressor
thermal overload
open? Use ohm
meter.3
Check for error code
CA,LA,HA,LA2,HA2,
P1, or P2
YES
NO
Check contactor
circuit. Does it have
power?3
NO
YES
Refer to Alarm Signals
in Digital Temperature
Controller
Programming Section
Contact Customer
Support
NO
YES
Verify contact coil is
being activated. Check
connectivity3, if issue
persists component
replacement may be
needed.
Contact
Customer
Support
YES
NO
YES
Contact Customer
Support
Replace Thermal
Overload.

1751 Hurd Drive ● Irving, Texas 75038 ● [phone] ● [phone] ● Fax [phone]
URL: www.thermal-edge.com ● Email: [e-mail]
SP-ENG-210-000-06 Rev 2.2 20 |P a g e
*3Note: Refer to Electrical Schematics for further diagnostics.
Flashing Error
Codes
Single or
Multiple
Codes?
2 +
1
Refer to Alarm Signals
in Digital Temperature
Controller
Programming Section
P1 / P2
combination
flashing?
YES
NO
Potential bad
connection. Check
green connector
behind controller.
CA
YES
NO
Check Low Pressure
Switch Connections
and Verify Pressure
switch is closed. Use
meter.3
P1 or
P2
NO
YES
Check probe
connections, potential
faulty probe.
LA, LA2, HA,
HA2
YES
Refer to Alarm Signals
in Digital Temperature
Controller
Programming Section
Fuse / Circuit
Protection
Nuisance Trip
Is fuse opening as
soon as unit turns
on?
NO
YES
Check incoming power
supply and connections
for potential short circuit
Does fuse open
when compressor
starts?
YES
NO
Check electrical specification.
Verify proper recommended fuse
has been selected.
Check compressor, if excess heat present compressor may
be faulty. Contact Technical Support.