Kooltronic K2NA4C3P21L5 User manual

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
900-039-42
INTEGRITY SERIES
K_NA4C3P21L
Find additional information on this
model at kooltronic.com, or use the
Technical Documents QR code
below.
Technical
Documents

TABLE OF CONTENTS
Page
I. Introduction 2
II. Incoming Inspection 3
III. Product Handling 3
IV. Product Identification Label 4
V. Principles of Operation 5 - 6
VI. Pre-Installation Testing 6
VII. Specific Model Data 7 - 9
Mounting
Drawings and Dimensions
Technical Data
Major Component Replacements
Standard Features
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 electronics 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 10.
2

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 air
conditioner 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
oFinal Assembly Number
aManufacturing Order Number
sFilter Part Number
dUnderwriters Laboratories Inc. Listed or Recognized Marks and NEMA ratings
We recommend you copy this information from your unit.
qwoa When ordering parts, specify the Model Number, Serial Number, Final Assy. 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
OUTDOOR USE
COMPARTMENT ONLY
NEMA/EEMAC/UL50 BY UNDERWRITERS LABORATORIES, INC.
TYPE 1 SPECIAL PURPOSE AIR CONDITIONER EQUIPMENT
TYPE 3R, 12 & 4/4X 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.
FINAL ASSY. NO. 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
ee ee rr
ty
qw
uu i
d
a
s
o

V. Principles of Operation
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. These Air
Conditioners utilize a "Closed-Loop Cooling System" to ensure
optimum performance of the installed components.
Closed-Loop cooling seals the electronic 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 removed through
the drain tube to the condensate evaporator. Condensate evaporates in the condensate evaporator and is released to
the ambient air by the condenser impeller.
The heat removed through the evaporator coil is transferred by the compressed refrigerant to the condenser coil.
Ambient air is then passed through the condenser coil, where it absorbs the heat and is then discharged to the
environment.
This unit is equipped with a Low Temperature Thermostat to prevent the evaporator coil from freezing. In conditions
of low ambient temperature and low enclosure load, the thermostat regulates the return air temperature from 75°F
to 86°F. The standard set point of the Low Temperature Thermostat is 75°F. The set point can be changed to
70°F or to 79°F by changing the location of the thermostat jumper (See illustrations below).
The Low Temperature Thermostat has a test start relay. When the air conditioner is turned on it will run constantly for
the first 15 minutes regardless of external temperatures. Afterwards, if the entering evaporator air temperature is lower
than the thermostat set point, the compressor and condenser blower will stop, and the thermostat will begin to control
the air conditioner.
CONDENSER
HEAT EXCHANGER
EVAPORATOR
HEAT EXCHANGER
HEATED AIR
FROM ENCLOSURE
COOL AIR
TO ENCLOSURE
CONDENSER OUTLET
(Heated Ambient Air Out)
(2 Places)
CONDENSER AIR
INLET
(Ambient Air In)
COMPRESSOR
5
P21
2.06
[52.3]
.17
[4.3]
2.60
[66.0]
2
1
1
24
3J2
345
10 9876
123
J1
CG
RELAY
CONTACTS
N.O.
240 VAC
120 VAC
TEMPERATURE
SENSOR
Mounting Holes (4)
.156 [3.9] DIA.
ADJUSTING
PINS
3
214
70ºF - Connect 1 and 2
75ºF - Connect 1 and 3
79ºF - Connect 1 and 4
Thermostat Jumper
ELECTRONIC
THERMOSTAT
CONTROL
Electronic Thermostat Control
Dimensions, inches [mm], are for reference only
and are subject to change.

The heater kit consists of a heater, a heat control thermostat and a heater limiter. The heater control thermostat
is a bimetal disk with a fixed set point of 60°F. When the entering evaporator air temperature rises above 60°F
the heater shuts off, and when the evaporator air temperature falls below 40°F the heater will engage. The
contact points of the alarm thermostat are normally closed. If the entering evaporator air temperature exceeds
120°F the alarm thermostat contacts open, and when the temperature drops below 120°F the contacts close.
A condenser fan speed controller is standard on this unit. The speed controller temperature sensor is installed
in the airstream of the condenser. When the ambient temperature is above 95°F the condenser fan will run at
full speed. When the ambient temperature is between 85°F and 95°F the condenser fan will run between
maximum and minimum speed. When the ambient temperature is lower than 85°F the condenser fan will cycle.
In applications having frequent voluntary heat load fluctuations, an optional Compressor Short Cycle Protector
is recommended.
When the Kooltronic Air Conditioner is properly sized it should operate constantly and maintain 75°F to 115°F
enclosure temperature, depending on the ambient temperatures.
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. The unit must sit in an upright position at a minimum room temperature of 65°F to allow the system to
warm-up. This is particularly important during winter months.
2. Refer to the nameplate for proper electrical voltage and current requirements. Connect the power cord
to a properly grounded and fused electrical supply, leaving electrical power to the unit turned off.
3. Note the factory thermostat setting which is 75oF.
4. Turn the electrical power on.
5. Verify that the evaporator blower or fan is running.
6. Condenser impeller should start immediately and after one (1) second, stop.
7. After three (3) to five (5) minutes the condenser impeller should start.
8. Verify that the condenser blower or fan is running.
9. 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°F and 80°F.
10. If ambient temperature is below 75oF, after fifteen (15) minutes the thermostat will shut off the compressor
and the condenser impeller.
11. Turn off the electrical power and disconnect the air conditioner from the power source.
12. If any cover plug was removed to adjust the unit, be sure to replace it in order to maintain the integrity
of the closed-loop airflow system.
NOTE: Before shipment all Kooltronic Air Conditioners are subjected to a performance test.
6
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. To avoid compressor damage do not tip the unit more than 45° from its
proper mounting position.

VII. Specific Model Data
Mounting
The Kooltronic Special Purpose Air Conditioners K_NA4C3P21L have been engineered to be installed easily.
These units utilize double layer gaskets. The first gasket layer is placed on the outside perimeter of the front panel
that is sealed against the customer enclosure. The second layer is placed on the two cutouts in the front panel.
The first gasket layer will allow a small amount of water between the two layers. The second gasket layer totally
protects an enclosure from ambient air, rain or hose down water. This gasket arrangement assures the integrity of
the closed loop system and is necessary to maintain the NEMA 4 rating.
Prior to mounting, refer to page 8 for the general arrangement drawing showing dimensions and locations of
mounting holes and cutouts. Prior to cutting or drilling, make sure that cutouts and mounting holes do not interfere
with components inside the cabinet. To avoid damaging your air conditioner, please read the following information
before installation:
CAUTION
7
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 Technical Data on page 9.
MOUNTING DRAWING
INSTALL THE MOUNTING PLATE W/STUDS
TO THE OUTSIDE WALL OF THE CUSTOMER'S
ENCLOSURE BEFORE INSTALLING A/C UNIT.
NOTE:
ENCLOSURE WALL
TYP. (3) PLACES
1/4'' NUT
CUSTOMER'S
ENCLOSURE
TYP. (3) PLACES
BOLT 1/4'' X 1-1/4''
RUBBER WASHER
MOUNTING PLATE
WITH STUDS
TOP SECTION
OF A/C UNIT
BOTTOM SECTION
OF A/C UNIT
RUBBER WASHER
1/4'' NUT
1/4'' NUT
TIGHTEN NUT TO
CLOSE GAP
1. It is recommended that a lift truck be used for installation.
2. Attach the Mounting Plate to the enclosure using (3) 1/4-inch
stainless steel nuts, (3) sealing washers as a spacer and (3)
1/4-inch stainless steel mounting nuts. Sealing washers must be
placed against customer enclosure (see mounting drawing).
3. Place the air conditioner on the lift truck. Insert a 1-inch
(approximate) wooden block between the lift truck bottom and
the air conditioner bottom so that the angle between the unit
mounting panel and the air conditioner is about 15 degrees.
4. Adjust the lift truck height so that the air conditioner hook is
located approximately 1/2-inch above the mounting plate.
5. Route the power cord through the discharge (upper) air cutout.
6. Move the air conditioner toward the enclosure panel so that the
gap between the hook and the enclosure is about .05-inch.
7. Slowly move the lift truck down until the hook engages with
the mounting plate. Continue to lower the lift truck. The air
conditioner will hang from the mounting plate flush against the
mounting panel.
8. Insert stainless steel screws through the holes in the mounting
plate bottom flange and the enclosure panel. Install sealing
washers and stainless steel nuts on each screw from inside the
enclosure and tighten (see mounting drawing).

8
21.26
[540.0]
DRAIN
12.47
[316.8]
.29
[7.5] 8.08
[205.3]
TYP.
3.40
[86.4]
TYP.
9.20
[233.7]
TYP.
11.54
[293.2]
TYP.
9.19
[233.4]
7.60
[193.0]
1.92
[48.9]
2.07
[52.5]
11.91
[302.6]
POWER
CORD
Drawings and Dimensions
K_NA4C3P21L SERIES
Dimensions, inches [metric], are for reference only and are subject to change.
(6) .312
[7.9] DIA.
HOLES
7.33
[186.3]
2.16
[54.8]
20.10
[510.5]
1.69
[43.0]
2.09
[53.0]
3.07
[78.0] .46
[11.8]
4.75
[120.6]
TYP.
11.91
[302.6]
21.26
[540.0]
12.47
[316.8]
COOL AIR TO
ENCLOSURE
HEATED AIR FROM
ENCLOSURE
CONDENSER AIR
INLET (Ambient Air In)
CONDENSER OUTLET
(Heated Ambient Air Out)
(2 Places)
7.91
[200.9]
6.91
[175.5]
6.75
[171.4]
1.25
[31.6]
TYP.
FIGURE 1 MOUNTING PLAN
Dimensions, inches [metric], are for reference only and are subject to change.
GA00365A - Rev. A

9
Technical Data
KNA4C3P21L 3000 2160 125 0 115 60 11.3 76
K2NA4C3P21L 3000 2160 131 0 230 60 4.7 76
K2NA4C3P21L5 3000 1940 131 0 230 50 4.6 76
Ambient Ambient Approximate
BTU/H BTU/H Temp. °F Temp. °F Running Weight
Model Capacity 95°F/95°F Max. Min. Volts Hz Amps (lbs.)
Major Component Replacements
KNA4C3P21L K2NA4C3P21L K2NA4C3P21L5
Part Part Number Part Number Part Number
Compressor 0665-101 0665-107 0665-110
Condenser Impeller 0194-14 0194-15 0194-15
Condenser Impeller Capacitor 0452-06 0452-73 0452-73
Evaporator Fan 0265-03 0265-06 0265-06
Filter 9501F 9501F 9501F
Standard Features
Condenser Impeller Speed Controller
CFC-Free refrigerant
Filter
Internal Corrosion Protection
Low Temperature Control Electronic Thermostat
Maintains NEMA 12 and NEMA 4/4X Rating (UL50)
Stainless Steel (304-2b) Cabinet
UL/CUL Listed

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) Remove the two screws from the rear panel.
2) Remove the rear panel from the unit.
3) Remove the filter from the filter holder by moving it up and towards you.
4) After removal the filter should be flushed under warm water with the clean side up, driving
contaminants out from 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.
5) The filter may be sprayed with Kooltronic A-16 Filter Coating Adhesive to trap fine airborne
contaminates, or it may simply be dried and reinstalled. Recoating is recommended for the best
results.
6) Reinstall the filter.
7) Replace the rear panel and attach it to the unit with two screws.
Do not operate the air conditioner for extended periods of time with the filter removed, as
the condenser coil may become clogged with dust or lint from the air entering the face. A
unit with a clogged condenser coil will have the same reaction as one with a clogged filter.
A clean filter is the best protection.