Kooltronic NPT Series 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
900-034-12 (1/19)
(CDR: 20131)
NPT SERIES
K2A6C16NPT52L
Find additional information on this
model at kooltronic.com, or use the
Technical Documents QR code
below.
Technical
Documents

TABLE OF CONTENTS
Section Page
I. Introduction 2
II. Incoming Inspection 3
III. Product Handling 3
IV. Product Identification Label 4
V. Principles of Operation 5
VI. Pre-Installation Testing 6
VII. Specific Model Data 7 - 10
Mounting
Drawings and Dimensions
Technical Data
Major Component Replacements
Standard Features
VIII. Maintenance 12 - 13
IX. Trouble Shooting 13 - 14
X. Warranty 15
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 Hazardous Location 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 12/3R 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
ee ee rr
ty
qw
uu i
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 75oF to 86oF. The standard set point of the Low Temperature Thermostat
is 75oF. The set point can be changed to 70oF or to 79oF by changing the location of the
thermostat jumper (See illustrations on page 8).
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.
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 60oF the heater shuts off, and when the evaporator air temperature falls below 40oF the
heater will engage. The contact points of the alarm thermostat are normally closed. If the entering
evaporator air temperature exceeds 130oF the alarm thermostat contacts open, and when the
temperature drops below 130oF the contacts close.
A condenser blower thermostat is standard on this unit. The thermostat temperature sensor is installed
in the refrigerant liquid line. When the ambient temperature is above 95oF the condenser fan will run at
full speed. When the ambient temperature is lower than 95oF the condenser fan will cycle. In
applications having frequent voluntary heat load fluctuations, an optional Short Cycle Protector is
recommended.
When the Kooltronic Air Conditioner is properly sized it should operate constantly and maintain 75oF to
115oF enclosure temperature, depending on the ambient temperatures.
CONDENSER
AIR IN
(2) PLACES
SUPPLY
AIR OUT
RETURN
AIR IN
CONDENSER
AIR OUT
CONDENSER
AIR IN
(2) PLACES
5
NPT52L

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 65oF 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 70oF when the
room temperature is between 70oF and 80oF.
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 45ofrom its proper
mounting position.

7
VII. Specific Model Data
Mounting
The Kooltronic Special Purpose Air Conditioners K2A6C16NPT52L have been engineered to be installed
easily. Prior to mounting, refer to the mounting plan on page 8 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:
•Install the two (2) mounting hooks using the four (4) supplied #10 screws, two screws for each
hook.
•Refer to the mounting plan on page 8 for the location of all mounting holes and cutouts.
•Make sure the cutouts don't interfere with components inside your cabinet.
•Proper alignment of all air inlets and outlets is essential for optimum performance of the air
conditioner.
•All externally-mounted air conditioners are fully gasketed to ensure proper sealing. This seal is
necessary to maintain the integrity of the closed loop system.
•Hang air conditioner onto the enclosure.
•Secure the air conditioner to the enclosure using the supplied hardware.
•Use all existing mounting holes to insure stability and a tight seal.
•Attach supplied drain hose to the drain exit on the lower side panel of the air conditioner.
•The external drain hose must not be elevated above the exit port. Improper mounting will impede
the flow of condensate and may cause internal malfunctions.
CAUTION
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.

8
Drawings and Dimensions
1.29
[32.7] (12) .312 [7.9]
DIA. HOLES
20.07
[509.7]
15.25
[387.3]
14.69
[373.1]
14.00
[355.6]
1.63
[41.4]
6.69
[169.9]
6.69
[169.9]
6.69
[169.9]
4.86
[123.4]
1.00
[25.4]
19.51
[495.5]
27.88
[708.1]
1.36
[34.5]
2.94
[74.6]
MOUNTING PLAN
Dimensions, inches [mm], are for reference only and are subject to change.
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.

9
1.63
[41.4]
14.00
[355.6]
17.26
[438.4]
10.36
[263.1]
TYP.
FILTERS
DRAIN
POWER CORD
20.85
[529.5]
TYP.
9.16
[232.6]
TYP.
3.91
[99.3]
TYP.
POWER SWITCH
MOUNTING HOOKS
.45
[11.4]
TYP.
2.94
[74.6]
1.36
[34.5]
15.25
[387.3]
1.00
[25.4]
.31
[7.8]
52.71
[1338.8]
37.37
[949.1]
10.02
[254.5]
14.13
[358.9]
10.45
[265.4]
.56
[14.2]
DRAIN
18.62
[472.9]
1.45
[36.83]
12.25
[311.1]
2.50
[63.5]
1.02
[25.9]
1.02
[25.9]
K2A6C16NPT52L
Dimensions, inches [mm], are for reference only and are subject to change. GA54900A
Drawings and Dimensions

10
Technical Data
K2A6C16NPT52L 16000 13300/11300 125/-40 230 60/50 18.0 189
Ambient Running Approximate
BTU/H BTU/H Temp. °F Amps Weight
Model Capacity 95°F/95°F Max./Min. Volts Hz 125°F/125°F (lbs.)
Major Component Replacements
K2A6C16NPT52L
Part Part Number
Compressor 0665-404
Compressor Run Capacitor 0452-90
Condenser Blower Motor 0261-80
Condenser Motor Capacitor 0452-06
Evaporator Impeller 0194-108
Evaporator Impeller Capacitor 0452-35
Condenser Coil (2) 0666-30
Evaporator Coil 0280-10
Filter 9001F
Standard Features
Built-in Condensate Evaporator
Condenser Impeller Controller
Filters (2)
Low Temperature Control Electronic Thermostat
Maintains NEMA 12 Rating (UL50)