Kooltronic Trimline NP28 Series User manual

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Keep This Manual
With Air Conditioner
AIR CONDITIONER
OPERATOR'S MANUAL
CAUTION
BEFORE INSTALLING AND
USING THIS AIR CONDITIONER,
IT IS IMPORTANT THAT THIS
MANUAL BE READ AND
UNDERSTOOD THOROUGHLY
KOOLTRONIC, INC.
30 Pennington-Hopewell Road
Pennington, NJ 08534
609•466-3400
FAX: 609•466-1114
www.kooltronic.com
900-039-22 (12/21)
(CDR: 20369)
TRIMLINE NP28 SERIES
KA4C4NP28L
with Serial Numbers up to and including L16A3713
K2A4C4NP28L
with Serial Numbers up to and including E16A1554

2
TABLE OF CONTENTS
Page
I. Introduction 2
II. Incoming Inspection 3
III. Product Handling 3
IV. Product Identification and Nameplate 4
V. Principles of Operation 5
VI. Pre-Installation Testing 6
VII. Specific Model Data 7 - 9
Mounting
Drawings and Dimensions
Technical Data
Major Component Replacements
VIII. Maintenance 10 - 11
IX. Trouble Shooting 12
X. Warranty 13
NOTE: Wiring Schematics are available on the specific model page of the Kooltronic website.
I. Introduction
Kooltronic Air Conditioners are designed to provide a cool, dehumidified environment for
your electronic components. There are models to fit virtually all sizes and shapes of
electronic enclosures, in capacities ranging from 1,000 to 30,000 BTU/H. Our
"closed-loop" design also ensures that your components will not be exposed to hot, dirty
operating conditions.
This Manual provides you with the necessary general information for properly installing
and operating standard Kooltronic Air Conditioners. Technical data and mounting
instructions are presented on pages 7 through 9.

3
II. Incoming Inspection
Kooltronic Air Conditioners are designed, built and packaged to withstand the shock and vibration normally
associated with shipment by common carriers. Occasionally improper handling during shipping causes damage.
Such handling could include unbanding of palletized shipments, failing to respect "This Side Up" arrows, rough
handling, falling off conveyors, excessive vibration, crushing, etc. Therefore, a thorough inspection should be
done upon receipt of all shipments. Any carton tears, dents, scratches, loose articles or evidence of oil are signs
of damage and should be noted on the Freight Bill. Cartons should be opened promptly and the units inspected
for CONCEALED DAMAGE. Kooltronic Air Conditioners must be delivered in the proper mounting position to
assure that damage to the compressor has not occurred during shipping. Any Kooltronic Air Conditioner that is
delivered removed from the banded pallet, lying down or double stacked should be refused.
An immediate claim MUST be filed with the freight carrier and an inspection requested. Retain all packing
materials. Kooltronic cannot assume responsibility for Consignee's failure to file a timely freight claim.
III. Product Handling:
1) Do not attempt to operate your Kooltronic Air Conditioner until you read and thoroughly understand this
Manual. See section VI PRE-INSTALLATION TESTING.
2) Before operating the Kooltronic Air Conditioner be certain that it is placed in its correct mounting position.
This Air Conditioner is designed to operate in a vertical position only. This placement must be done
a minimum of 5 minutes prior to operating in order to allow the compressor oil to drain to the compressor
sump area.
CAUTION
3) Before operating this unit, all electrical wiring must be checked to assure the proper connection to the correct
power source. Minimum circuit ampacity should be at least 125% of the amperage found on the nameplate
for the corresponding voltage. Do not exceed the maximum fuse size found on the nameplate.
4) We do not recommend that Air Conditioners be shipped to their final destination attached to an enclosure. In
the event that the Air Conditioner needs to be shipped attached to an enclosure it is strongly recommended
that proper support be provided for the Air Conditioner. Excessive vibration can occur if Air Conditioners are
not properly supported when shipped on enclosures, increasing the potential for internal damage and voiding
the warranty.
5) PROCEDURE FOR PROPER PACKING AND SHIPMENT OF KOOLTRONIC AIR
CONDITIONERS:
■Keep Air Conditioner in proper upright position indicated by arrow markers.
■Pack Air Conditioner in an appropriate carton (preferably original carton if possible), with adequate
internal protective packaging, making sure carton is marked and is kept in correct upright position.
■For local, controlled transportation, strap carton to a secure part of truck to prevent falling or
sliding, minimize vibration, etc.
■For common carrier shipment, band unit(s) securely to a pallet. Unpalleted shipment risks
severe damage which voids the warranty.
Kooltronic Air Conditioners must be operated in their proper mounting position. If attempts are
made to operate a unit that is not in its designed mounting position, permanent compressor
damage will occur. This action will void the warranty. To avoid compressor damage do not tip the
unit more than 45° from its proper mounting position.

4
IV. Product Identification and Nameplate
Each Kooltronic Air Conditioner includes an identification nameplate. This nameplate provides:
qModel Number
wSerial Number
eElectrical power characteristics
rMaximum and minimum ambient operating temperatures
tCooling capacity
yType and amount of refrigerant required for recharging
uDesign Pressure
iMaximum Fuse Size
oManufacturing Order Number
aFilter Part Number
sUnderwriters Laboratories Inc. Listed or Recognized Marks and NEMA ratings
We recommend you copy this information from your unit.
qwo When ordering parts, specify the Model Number, Serial Number & MFG. Order Number.
eBefore operating, be sure that the power source matches these requirements.
yUse of incorrect type or amount of refrigerant will adversely affect performance and may damage the unit.
r Make sure that these parameters are met. Failure to do so may result in permanent damage to the unit.
ALL MOTORS ARE THERMALLY PROTECTED
VIOLATES WARRANTY
UNAUTHORIZED SERVICE OR MODIFICATION
COMPARTMENT ONLY
NEMA/EEMAC/UL50 BY UNDERWRITERS LABORATORIES, INC.
TYPE 1 SPECIAL PURPOSE AIR CONDITIONER EQUIPMENT
TYPE 12 INTERFACE TO THE ELECTRICAL ENCLOSURE ONLY
NEMA/EEMAC/UL50 BY UNDERWRITERS LABORATORIES, INC.
SPECIAL PURPOSE AIR CONDITIONER
FUSE SIZE
MAX.
HIGHLOW
Oz.REFRIGERANT
MAX.°FMIN.°F
AMBIENT TEMP.COOLING
ALLOW 5 MIN. BEFORE RESTARTING AFTER SHUTDOWN
Air Conditioner
DESIGN PRESSURE P.S.I.G.
MFG. ORDER NO.
KOOLTRONIC, INC. PENNINGTON, NJ
MANUFACTURED BY:
COOLING BTU
F. L . A .PH.FREQ.VOLTS
SERIAL NUMBERMODEL NUMBER
FILTER P/N
SERVICE AIR FILTER REGULARLY
LISTED 84H7
SPECIAL PURPOSE
AIR CONDITIONER
e e e e rr
ty
q w
uui
a
s
o

5
Kooltronic Air Conditioners are required when the equipment operating temperature must be kept near or lower
than the ambient room temperature, and/or the cabinet must be sealed from dust, fumes, oil, corrosives
and other contaminants. This Air Conditioner utilizes a "Closed-Loop Cooling System" to ensure optimum
performance of the installed components.
Closed-Loop cooling seals the electrical enclosure from hostile elements in the environment. Two separate
circulation systems are employed. The internal system cools and dehumidifies the air inside the cabinet,
totally isolating the sensitive electronics and other components from the environment. The external system
uses circulating ambient air or water to discharge the heat removed from the electronics.The heat is dissipated
from the enclosure by means of the vapor compression refrigeration cycle. This takes place in a hermetically-
sealed refrigeration system, utilizing either an air-cooled or water-cooled condenser heat exchanger. The warm
air inside the enclosure is drawn through the evaporator coil where it is cooled, dehumidified and returned.
Any enclosure moisture accumulated on the evaporator coil is collected in the condensate tray and released to
the ambient air through the drain tube or the condensate evaporator.
The heat removed through the evaporator coil is transferred by the compressed refrigerant to the condenser
coil. Ambient air or water is then passed through the condenser coil, where it absorbs the heat and is then
discharged to the environment.
Kooltronic Air Conditioners are designed to operate continuously in order to eliminate compressor cycling,
which shortens compressor life and causes line transients. The cool air discharge temperature is regulated by
the capacity control (hot gas bypass) valve. The unit is equipped with a Low Temperature Thermostat to prevent
over-cooling. In applications having frequent voluntary or involuntary power interruptions, an optional
Compressor Short Cycle Protector is recommended to allow adequate time for the internal pressures of the Air
Conditioner to equalize before restarting.
V. Principles of Operation
CONDENSER OUTLET
(Heated Ambient Air Out)
CONDENSER HEAT
EXCHANGER
CONDENSER AIR
INLET
(Ambient Air In)
REFRIGERANT
FILTER DRIER
CONTROL
BYPASS VALVE
METERING
DEVICE
(Capillary Tube
shown)
COMPRESSOR
EVAPORATOR
HEAT EXCHANGER
COOL AIR TO
ENCLOSURE
ACCUMULATOR
CONDENSER
AIR INLET
(Ambient Air In)
HEATED AIR FROM
ENCLOSURE

6
VI. Pre-Installation Testing
Before mounting the air conditioner to the enclosure, test for proper operation. This
will verify the shipping integrity of the system. Please follow the steps below prior to
installation.
CAUTION
1. Allow the unit to sit in an upright position at a room temperature of 65°F minimum,
allowing the system to warm-up, particularly in winter months.
2. Refer to the nameplate for proper electrical voltage and current requirements. Then
connect the power cord to a properly grounded and fused electrical supply. Leave the
electrical power off.
3. Note the factory thermostat setting which is typically 75 to 80°F.
4. Adjust thermostat to its maximum setting.
5. If your unit is equipped with an on-off switch, move it to the on position.
6. Turn electrical power on.
7. Verify that the evaporator blower or fan is running.
8. Adjust the thermostat to its minimum setting. The compressor should start. On units
equipped with a short cycle protector, the compressor will have a delayed start of 6
minutes from the time power is applied to the unit.
9. Verify that the condenser blower or fan is running. Note, on units equipped with a low
ambient kit, the start of the condenser fan or blower will be delayed until the system
pressures rise.
10. Operate the air conditioner for approximately ten (10) minutes. During this period no
unusual noise or vibration should be evident. Both the evaporator and condenser fans
or blowers should be delivering air through their respective discharge ports. The cool
air discharged should be less than 70°F when the room temperature is between 70
and 80°F.
11. On units equipped with heaters, adjust both the cooling and heating thermostats to
their maximum settings. Verify that the compressor and condenser fan or blower has
stopped. Verify elevated discharge air temperature from the evaporator air discharge.
12. If your unit is equipped with an on-off switch, leave it in the on position. Return the
cooling thermostat to its original setting. If unit is equipped with a heater, return the
heating thermostat to its original position.
13. Turn off the electrical power source, and disconnect the air conditioner from the power
source.
14. If any cover plug is removed to adjust the unit, make certain to put back in place to
maintain the integrity of the closed-loop airflow system.
NOTE: Before shipment all Kooltronic, Inc. Air Conditioners are subjected to a
performance test.
The Air Conditioner must be standing in its proper mounting position for a
minimum of five (5) minutes prior to testing. Failure to follow this procedure
will cause permanent damage to the compressor.

7
VII. Specific Model Data
Mounting
CAUTION
Kooltronic Air Conditioners have been engineered to be installed easily. To avoid damaging your
Air Conditioner, please read the following information before installation:
1. Loosen the four screws holding the Mounting Template and Assembly Bracket (M/TAB) to the
unit. Remove the M/TAB.
2. See Figure 1 for proper orientation.Place the M/TAB flush against the outside of the cabinet
to locate cutouts and mounting holes.
3. NOTE: The top cutout for the warm air return does not have to match the full 7" opening on
the M/TAB.You can locate your cutout anywhere within this opening. Locate your cutout close
to the top and not less than 3" high. Make sure the cutouts don't interfere with components
inside your cabinet.
4. Mount the M/TAB to the outside of the cabinet using all the mounting hardware supplied by
Kooltronic (1/4-20 screws/nuts/washers). Preferred positions: one in each corner and two near
center on each side. NOTE: Make sure the screws are inserted with heads toward you. Tighten
nuts securely.
5. Route the power cord through the top cut out in your cabinet. Mount the unit to the M/TAB by
sliding the 4 studs on the side panel into the 4 slots on the M/TAB. After unit is in place,
tighten 2 screws at bottom of unit. These two screws will force the M/TAB into studs on side
panel for a tight seal.
6. Attach overflow drain hose supplied to the drain exit at the bottom of the unit. This hose must
not be elevated above the exit port. Improper mounting will impede the flow of condensate and
may cause internal malfunctions.
If the Air Conditioner is mounted to the cabinet door you must be sure that the
door hinges will support the additional weight of the Air Conditioner. Also be certain
that when the door is opened fully, the cabinet does not become unbalanced. The
actual weight of the unit can be found in the performance specifications.
Dimensions (inches) are for reference only and are subject to change.
MOUNTING PLAN
281/2
23/4
11/2
101/8
281/2
THERMOSTAT
ADJUSTMENT
FILTER
111/2
DRAIN*
M/TAB
POWER
CORD
101/8
8
7
11/16
19/16
73/4
33/8
35/8
73/4
43/16
71/2
TYP.
(8)
.312 DIA.
HOLES
215/16 45/16
➃
➃
➂
➂
➀
➁
FILTERED
CONDENSER AIR INLET
(Ambient Air In) (NP28 only)
CONDENSER OUTLET
(Warm Ambient Air Out)
(NP28 only)
➀
➁
WARM AIR RETURN
FROM ENCLOSURE
COOL AIR OUTLET
TO ENCLOSURE
➂
➃
FIGURE 1

8
101/8
281/2
THERMOSTAT
ADJUSTMENT
FILTER
111/2
DRAIN*
M/TAB
POWER
CORD
➃
➂
➀
➁
FILTERED
CONDENSER AIR INLET
(Ambient Air In) (NP28 only)
CONDENSER OUTLET
(Warm Ambient Air Out)
(NP28 only)
➀
➁
WARM AIR RETURN
FROM ENCLOSURE
COOL AIR OUTLET
TO ENCLOSURE
➂
➃
Drawings and Dimensions
NP28 SERIES
* Other drain outlets are available - contact KOOLTRONIC
Dimensions (inches) are for reference only and are subject to change.

9
Standard Features
Built-in Condensate Evaporator
CFC-Free Refrigerant
Filter
Low Temperature Control Thermostat
NEMA 12 Rating Maintained (UL50)
UL/CUL Listed
Accessories and Options
Compressor Short Cycle Protector
Enclosure Heater
Filter Recoating Adhesive
High-Capacity Condensate Evaporator
Internal Corrosion Protection
Lifting Eyes
Low Airflow Detector
Low Ambient Kit
Remote Thermostat Relay
Replacement Filters
Special materials or finishes
Special motors, line cords or connectors
Stainless or Aluminum Shell
Temperature Alarm
Weather Protection Kit
Technical Data
KA4C2NP28L 2000 125/50 115/100 60/50 13.0/12.0 85
KA4C2NP28L56 2000 125/50 115 50/60* 13.0 85
K2A4C2NP28L 2000 120/50 230/200 60/50 6.0 85
K2A4C2NP28L5 2000 125/50 230 50 6.5 85
KA4C3NP28L 3000 125/50 115/100 60/50 13.0/12.0 85
KA4C3NP28L56 3000 125/50 115 50/60* 13.0 85
K2A4C3NP28L 3000 120/50 230/200 60/50 6.0 85
K2A4C3NP28L5 3000 125/50 230 50 6.5 85
KA4C4NP28L 4000 125/50 115/100 60/50 13.0/12.0 85
KA4C4NP28L56 4000 125/50 115 50/60* 13.0 85
K2A4C4NP28L 4000 120/50 230/200 60/50 6.0 85
K2A4C4NP28L5 4000 125/50 230 50 6.5 85
** Ambient ** Approximate
BTU/H Temp. °F Running Weight
Model Rating Max./Min. Volts Hz Amps (lbs.)

*Switchable. Switch is internally-mounted for security.
** Rating shown is for operation at maximum ambient temperature.
115V, 60 Hz and 230V, 60 Hz models also perform at full capacity when operated
at 100V, 50 Hz or 200V, 50 Hz respectively. No transformer is required.
Major Component Replacements
KA4C_NP28L
Part Part Number
Compressor 0665-101
Condenser Blower Motor 0261-102
Condenser Blower Motor Capacitor 0452-05
Condenser Blower Assembly 609028-00-16
Evaporator Blower Motor 0261-120
Evaporator Blower Motor Capacitor 0452-03
Evaporator Blower Assembly 609028-00-15
Filter 8751F
NOTE: Part Numbers shown are for 115V, 60 Hz/1Ø. For 230V and all 50 Hz consult Kooltronic.

10
VIII. Maintenance
Kooltronic Water-Cooled Air Conditioners require no maintenance. Air-Cooled Air
Conditioners are designed to require only the routine cleaning of air filters to assure
unimpeded airflow through the condenser heat exchanger. It is not possible to
recommend specific filter cleaning intervals since the level and the nature of airborne
particulate matter differs widely with each installation. It is generally sufficient to remove
and wash the reusable aluminum mesh air filters when the outer surfaces of these filters
appear covered with a thin layer of dust or lint. Filter recoating adhesive is recommended.
Appropriate disposable filters are available from Kooltronic.
If filter service is neglected or delayed, the air conditioner will not perform at its design
capacity. The first indication of excessively clogged air filters is usually a gradual
increase of temperature within the equipment cabinet. If operation is continued under
these conditions, the compressor will be shut off by the thermal overload device. The
compressor will restart when its external temperature drops below the protector threshold
setting and the compressor will continue to cycle on and off. Continued operation under
these conditions will cause damage, shorten compressor life and void the warranty.
A. Filter Removal and Service
Kooltronic Air Conditioners feature an easily removable inlet filter to facilitate
necessary cleaning.
CAUTION
1) Lift the filter using the attached tab to clear the lower filter retainer.
2) After removal, the filters should be flushed under warm running water with
the clean side up, driving contaminants out the dirty side of the filter. If the
accumulated dirt is oily, washing in a detergent bath is recommended, followed
by a warm water rinse as above.
3) The filters may be sprayed with Kooltronic A-16 Filter Recoating Adhesive to
trap fine airborne contaminants, or they may simply be dried and reinstalled as
strainer type filters. Recoating is recommended for best results.
4) Reinstall the filter: (a) keeping the tab at the bottom, slide filter into the upper
retainer, (b) press filter against the unit and, (c) slide down into lower retainer.
Do not operate the Air Conditioner for extended periods of time with the
filter removed. The condenser coil may become clogged with dust or
lint from the air entering the face. A clogged condenser coil is not
readily detected and will give the same reaction as a clogged filter. A
clean filter is the best protection.