Kooltronic KA4C2WNP28 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
TRIMLINE
WNP28 SERIES
900-039-29
Find additional information on
this model at kooltronic.com or
use the Technical Documents
QR code below.
Technical
Documents

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 water temperature °F
tCooling capacity
yType and amount of refrigerant required for recharging
uDesign Pressure
iMaximum Fuse Size
oFinal Assembly Number
aManufacturing Order Number
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
FUSE SIZE
MAX.
HIGHLOW
Oz.REFRIGERANT
TEMP.°F
MAX. WATERCOOLING
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
eeee r
ty
qw
uu i
a
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.
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 heat load fluctuations, an
optional Compressor Short Cycle Protector is recommended.
V. Principles of Operation

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 a upright position at a room temperature of 65°F minimum, allowing the
system to warm-up. This is particularly important 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 the thermostat to its maximum setting.
5. If the 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 six (6) minutes from the time
the power is applied to the unit.
9. Verify that the condenser blower or fan is running. Note that 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 the unit is equipped with an on-off switch, leave it in the on position. Return the cooling
thermostat to its original setting. If the 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 it 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
Kooltronic Air Conditioners have been engineered to be installed easily. To avoid damaging your Air
Conditioner, please read the following information before installation:
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.
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 Technical Data on page 9.
10.14
[257.6]
28.50
[723.9]
11.50
[292.1]
DRAIN
HIGH PRESSURE
RESET SWITCH
POWER CORD
WATER INLET
WATER OUTLET
1
1
2
8.00
[203.2]
7.00
[177.8]
1.07
[27.2]
2.39
[60.6]
7.50
[190.5]
TYP.
(8) .250 [6.4]
DIA. HOLES
7.00
[177.8]
4.30
[109.2]
7.75
[196.8] 1.57
[39.9]
2.92
[74.2]
1.57
[39.9]
1.50
[38.1]
7.75
[196.8]
2.76
[70.2]
3.41
[86.7]
4.18
[106.3]
M/TAB
SUPPLY
AIR OUT
RETURN
AIR IN
RETURN
AIR IN
FIGURE 1 WNP28 SERIES
WARM AIR RETURN FROM
ENCLOSURE
COOL AIR OUTLET
TO ENCLOSURE
1
2
Dimensions (inches) are for reference only and are subject to change.
MOUNTING PLAN

8
11.50
[292.1]
10.14
[257.6]
POWER CORD
HIGH PRESSURE RESET SWITCH
3.63
[92.1]
7.71
[195.8]
17.29
[439.1]
TYP.
WATER OUTLET 3/8 - 18 NPT MALE FITTING
WATER INLET 3/8 - 18 NPT MALE FITTING
DRAIN*
.63
[16.1] 4.01
[101.9]
28.50
[723.9]
THERMOSTAT ADJUSTMENT
1
1
2
Drawings and Dimensions
WNP28 SERIES
* Other drain outlets are available - contact KOOLTRONIC Dimensions, inches [mm], are for reference only and are subject to change.
GA00417A - Rev. A
WARM AIR RETURN FROM ENCLOSURE
COOL AIR OUTLET TO ENCLOSURE
1
2

9
Technical Data
Major Component Replacements
KA4C_WNP28
Part Part Number
Coax Coil 0666-23
Compressor 0665-101
Compressor Capacitor 0452-51
Evaporator Blower Motor 0261-120
Evaporator Blower Motor Capacitor 0452-03
Evaporator Blower Assembly 609028-00-15
NOTE: Part Numbers shown are for 115V, 60 Hz/1Ø. For 230V and all 50 Hz consult Kooltronic.
Standard Features
CFC-Free Refrigerant
Excess Pressure Control
Low Temperature Control Thermostat
Water Regulating Valve
MRated for full capacity load at 85°F water. Usage will vary at lower load or cooler
water conditions.
* Switchable. Switch is internally-mounted for security.
** Rating shown is for operation at maximum water 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.
KA4C2WNP28 2000 1.0 115/100 60/50 13.0/12.0 85
KA4C2WNP28/56 2000 1.0 115 50/60* 13.0 85
K2A4C2WNP28 2000 1.0 230/200 60/50 6.0 85
K2A4C2WNP28/5 2000 1.0 230 50 6.5 85
KA4C3WNP28 3000 1.0 115/100 60/50 13.0/12.0 85
KA4C3WNP28/56 3000 1.0 115 50/60* 13.0 85
K2A4C3WNP28 3000 1.0 230/200 60/50 6.0 85
K2A4C3WNP28/5 3000 1.0 230 50 6.5 85
KA4C4WNP28 4000 1.0 115/100 60/50 13.0/12.0 85
KA4C4WNP28/56 4000 1.0 115 50/60* 13.0 85
K2A4C4WNP28 4000 1.0 230/200 60/50 6.0 85
K2A4C4WNP28/5 4000 1.0 230 50 6.5 85
BTU/H Water Flow (GPM) Running Approx. Weight
Model Rating @85°F. Max MVolts Hz Amps** (lbs.)
""
Units in BOLD are current standard products. Other units are prior product offerings and shown for reference only.

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.