Koldwave Kompac 4WK07 User manual

S:\Koldwave\Kompac 4-Series IOM
Koldwave 4830 Transport Drive Dallas, Texas 75247
www.koldwave.com www.mestekparts.com
1
Koldwave Kompac Installation & Operation Manual
For models 4WK07, 4WK14, 4WK16, 4WK23, 4WK26
Model No._______________________ Serial No._______________________________
ATTENTION: READ THIS MANUAL, FACTORY INSTALLED OPTIONS MANUAL,
UNIT SUBMITTAL DATA SHEETS AND ALL LABELS ATTACHED TO THE UNIT
CAREFULY BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE
THESE UNITS. CHECK DATA PLATES FOR ELECTRICAL SPECIFICATIONS
AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT THE POINT OF
INSTALLATION. RECORD THE UNIT MODEL AND SERIAL NUMBER IN THE
SPACE PROVIDED. RETAIN THIS DOCUMENT FOR FUTURE REFERENCE.
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR
MAINTENANCE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH. THIS
APPLIANCE MUST BE INSTALLED BY A LISCENCED CONTRACTOR OR
QUALIFIED SERVICE PERSONNEL. READ THESE INSTALLATION, OPERATING
AND MAINTENANCE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR
SERVICING THE UNIT.
WARNING: INSTALL, OPERATE AND MAINTAIN UNIT IN ACCORDANCE WITH
MANUFACTURER’S INSTRUCTIONS TO AVOID ANY DETURING FACTORS
THAT MAY CAUSE PERSONAL INJURY OR PROPERTY DAMAGEDAMAGE.
RECEIVING INSTRUCTIONS: INSPECT SHIPMENT IMMEDIATELY UPON
ARRIVAL TO DETERMINE IF ANY DAMAGE HAS OCCURRED TO THE UNIT
DURING SHIPMENT. AFTER THE UNIT HAS BEEN UNCRATED, CHECK FOR
ANY VISIBLE DAMAGE TO THE UNIT. IF ANY DAMAGE IS FOUND, THE
CONSIGNEE SHOULD SIGN THE BILL OF LADING INDICATING SUCH DAMAGE
AND IMMEDIATELY FILE A CLAIM FOR DAMAGE WITH THE
TRANSPORTATION COMPANY.
INSTALLER’S RESPONSIBILITY: THIS EQUIPMENT HAS BEEN RUN TESTED
AND INSPECTED THOROUGHLY. IT HAS BEEN SHIPPED FREE FROM
DEFECTS FROM OUR FACTORY. HOWEVER, DURING SHIPMENT AND
INSTALLATION, PROBLEMS SUCH AS LOOSE WIRES, LEAKS OF LOOSE
FASTENERS MAY OCCUR. IT IS THE INSTALLER’S RESPONSIBILITY TO
INSPECT AND CORRECT ANY PROBLEMS THAT MAY BE FOUND.

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Table of Contents:
GENERAL INFORMATION........................................................................................................................................................3
GENERAL REQUIREMENTS.............................................................................................................................................................3
SPECIFICATION AND ELECTRIC DATA ...............................................................................................................................4
STANDARD AND OPTIONAL FEATURES ..............................................................................................................................6
STANDARD FEATURE ....................................................................................................................................................................6
AIR FLOW FLEXIBILITY.................................................................................................................................................................6
QUITE, RUGGED CABINET.............................................................................................................................................................6
AUTOMATIC WATER VALVE .........................................................................................................................................................6
SAFETY ENGINEERED.................................................................................................................................................................... 6
TOUCH PAD CONTROLS & REMOTE............................................................................................................................................... 6
BUILT-IN CONDENSATE PUMP.......................................................................................................................................................6
WATER-COOLED CONDENSER COIL...............................................................................................................................................6
FILTER.......................................................................................................................................................................................... 6
DISCHARGE AIR GRILLES.............................................................................................................................................................. 7
QUICK CONNECT WATER HOSE..................................................................................................................................................... 7
SERVICE CORD..............................................................................................................................................................................7
OPTIONAL FEATURES....................................................................................................................................................................7
INSTALLATION INSTRUCTION...............................................................................................................................................7
UNIT OPERATION.......................................................................................................................................................................9
UNIT POWER ON:..........................................................................................................................................................................9
FAN HI: ........................................................................................................................................................................................9
FAN LO:........................................................................................................................................................................................9
COOLING HI:.................................................................................................................................................................................9
COOLING LO:................................................................................................................................................................................ 9
HEATING HI (HEAT PUMP UNIT):.................................................................................................................................................. 9
HEATING LO (HEAT PUMP UNIT): .................................................................................................................................................9
TEMPERATURE SETTING:...............................................................................................................................................................9
UNIT OFF:..................................................................................................................................................................................... 9
OTHER SETTINGS:.........................................................................................................................................................................9
COMPRESSOR OFF TIME (*): .......................................................................................................................................................10
SELF RECOVERY MODE (*):........................................................................................................................................................10
CHECK ALARMS: ........................................................................................................................................................................10
AUTO RESET HIGH/LOW PRESSURE SWITCH:...............................................................................................................................10
OPTIONAL REMOTE CONTROL:....................................................................................................................................................10
WATER FLOWS AT VARIOUS ENTERING WATER TEMPERATURES........................................................................12
MODES OF OPERATION..........................................................................................................................................................13
KOOLETTE UNIT CONSTRUCTION .....................................................................................................................................14
KOMPAC UNIT CONSTRUCTION..........................................................................................................................................15
KING KOMPAC UNIT CONSTRUCTION ..............................................................................................................................16
PREVENTIVE MAINTENANCE/INSPECTION AND REPAIR ........................................................................................... 17
TROUBLE SHOOTING GUIDE................................................................................................................................................22
WIRING DIAGRAM ...................................................................................................................................................................31
PIPING DIAGRAM .....................................................................................................................................................................32
LIMITED WARRANTY..............................................................................................................................................................33

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General Information
Kompac Series Air Conditioners and Heat
Pumps are designed for applications where
outside air is not available and spot cooling
is required. The cord connected Koolette,
Kompac and King Kompac is a 7000
(countertop application), 14000, 16000,
23000 or 26,000 Btu/Hr floor mount
configuration unit to meet any space
requirements.
Our Kompac units are completely self-
contained with the entire refrigeration
system, fan blower assembly, water valve,
and electrical components housed in a metal
cabinet with stainless steel finish. Each unit
will also come along with an optional
remote control. Only power and condenser
water supply, water discharge, and
condensate drain piping are required for
installation. With the heat pump option,
user can manually select HEAT or COOL
options through the touch pad control panel
or through the remote control, depending
upon thermostat command.
The water-cooled condenser requires only
that amount of water needed to achieve the
desired high and low refrigeration system
pressures. The condenser water flow rate
for any entering water temperature can be
obtained using the graph on page 12. A
refrigeration system head pressure actuated
water-regulating valve regulates condenser
water.
General Requirements
For proper control of the water flow rate
entering the automatic water valve, the
minimum water pressure required for
condenser water supply is 30 PSIG. The
condenser water temperature leaving the
unit should not exceed 110F. Ignoring this
compliance will void the warranty on the
refrigeration system. On heat pump models,
it is not recommended to operate the unit in
the heating cycle when the water inlet
temperature is below 50F. Doing so could
reduce the specified heating capacity and
may cause the freeze control to cycle the
compressor off, resulting in a loss of
heating.
IMPORTANT: The Koldwave Kompac
unit has been designed and engineered to
provide needed cooling within the
performance parameters of this manual.
Following the installation and preventative
maintenance instructions can extend the
length of service you receive.

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Specification and Electric Data
CAPACITY CODE 4WK07 4WK14 4WK16 4WK23 4WK26
CAPACITY DATA
Cooling Capacity (A) 7000 12500 16000 23200 26000
Heating Capacity (B) & (D) 7800 14200 17900 31000 31000
Evaporator-CFM @ 0.0 ESP 250 410 480 800 800
ELECTRICAL DATA
Volts (Single Phase) 115 115 115* 208/230 208/230
Amperes (Cooling) 8.00 11.60 13.00 12.70/11.80 12.70/11.80
Amperes (Heating) 7.5 10.80 13.00 12.50/11.50 12.50/11.50
Watts (Cooling) 897 1276 1684 2416 2708
Watts (Heating) 840 1301 1692 2839 2839
E.E.R. 7.80 9.80 9.50 9.60 9.60
C.O.P. 2.70 3.20 3.10 3.20 3.20
Fuse/Breaker amps 15 15 20 20 20
Compressor H.P. 1/2 1 1 1/4 2 2
Blower Motor H.P. 1/25 1/15 1/15 1/7 1/7
In Rush Current (amps) 40.00 71.50 95.50 72.90 72.90
CONDENSATE PUMP
Power Consumption with Pump on 30 30 30 30 30
Voltage 115 115 115 208/230 208/230
Maximum Discharge Lift (Feet) 19.5 19.5 19.5 19.5 19.5
CONDENSER WATER FLOW & PRESSURE DROP DATA (G)
GPM @ 85F E.W.T. 1.75 3.00 4.00 6.00 6.00
Cond. Coil delta P (P.S.I.) 1.40 3.00 5.30 6.80 6.80
Water Valve delta (P.S.I) 2.00 3.00 5.00 14.00 14.00
GPM @ 60F E.W.T. 100F L.W.T. 0.44 0.75 1.00 1.50 1.50
Cond. Coil delta P (P.S.I.) 0.60 0.80 1.00 0.80 0.80
Water Valve delta (P.S.I) 2.00 2.00 2.00 2.00 2.00
Max. Water Side Working Pressure/With Water Valve-150 P.S.I./Without Valve-400 P.S.I.
MISC. DATA
Evap. Coil-# of Rows 3 3 3 4 4
Coil Face Area (FT2) 0.83 1.20 1.20 1.90 1.90
Refrigerant Charge R-22 in oz. 14 20 22 39 39
DIMENSIONAL DATA (inches)
Height-With Casters 17 5/8 31 1/2 31 1/2 28 ¾ 28 ¾
Height-Without Casters n/a 29 1/8 29 1/8 26 3/8 26 3/8
Length 22 3/8 25 25 36 36
Depth 12 10 3/16 10 3/16 12 1/4 12 ¼

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4WK07
4WK16
4WK23
AIR FILTER DATA (inches)
Width 15 3/4 18 18 24 24
Height 9 1/4 16 16 11 3/4 11 ¾
Thickness 1/2 1/2 1/2 1/2 ½
NET WEIGHT 83 124 125 183 183
SHIPPING WEIGHT 89 133 134 201 201
(A) Cooling Capacity Rating Test Conditions: Evaporator Air - 80F D.B./67F W.B.
Condenser Water - 85F E.W.T./95F L.W.T.
(B) Heating Capacity Rating Test Conditions: Evaporator Air - 70F D.B./60F W.B.
Condenser Water - 70F E.W.T.
(C) Time Delay Fuses and Circuit Breakers are recommended.
(D) Reverse cycle units require 50F minimum water inlet temperature during the heating cycle.
(E) Total pressure drop for unit with Water Regulating Valve is sum of Condenser Coil and Water Valve Pressure Drop.
* Also available in 208/230 volt.

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Standard and Optional Features
Standard Feature
All Kompac series unit has removable
panels to provide full service accessibility.
Each unit comes with standard sliding glides
for ultimate mobility.
Air Flow Flexibility
Air is discharged through four-way
adjustable grilles, enabling a variety of
airflow possibilities. All King Kompac
model five grilles respectively. Washable,
aluminum air filters are installed in each
unit. Periodic cleaning will ensure optimal
unit performance.
Quite, Rugged Cabinet
All Kompac series unit outside panels are
constructed stainless steel finish for rigid
construction.
Automatic Water Valve
All Kompac (air conditioners and heat
pumps) are equipped with a direct acting,
refrigeration system head pressure actuated
water-regulating valve. This valve, set at
the factory for 95 to 100F outlet water
temperature, permits only that amount of
water to follow that is needed to achieve the
desired refrigeration system pressures. In
addition, heat pump models are quipped
with a water bypass solenoid valve to
provide immediate and continuous water
flow on heating.
Safety Engineered
All units incorporate with in the
refrigeration system, a high-pressure switch
for maximum safety of the compressor. The
cutout pressure setting is 375 PSIG +/- 5
PSIG, and it will reset at 265 PSIG. A low-
pressure switch is also included which opens
at 26 PSIG and reset at 68PSIG. During the
heating cycle of the heat pump models, a
freeze control sensor set at 37 +/- 2 F
monitors the water temperature leaving the
condenser to cut-out the unit and protect the
condenser from freezing.
Touch Pad Controls & Remote
All models have self-contained thermostats
to provide the desired amount of cooling,
which can be selected by adjusting the Up
and Down arrows on the unit touch pad or
remote controls. (Please refer to the Unit
Operation for detailed explanation)
Built-In Condensate Pump
Each unit contains a condensate pump for
the positive removal of evaporator
condensate. It is a completely automatic
operation and the pump will operate only
when water is present and will stop when the
water has been pumped away. Each pump
will remove up to 14 liters/hour (3.75 gph).
Water-cooled Condenser Coil
All Kompac series units are equipped with
coaxial/trombone “tube-in-tube” design
condenser coil. Water flows through the
inner tube while refrigerant flows in the
annulus between the inner and outer tubes.
Filter
All Kompac series units are equipped with
1/2” thick, washable, aluminum mesh air
filter located behind the front panel that can

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easily be removed and cleaned. Just pull the
filter end cap tab at bottom of filter and slide
out.
Discharge Air Grilles
All Kompac series units are equipped with
four, or five 5” x 5”, four-way adjustable,
plastic grilles located in the upper front
panel, enabling a variety of airflow
possibilities. Life panel, enabling a variety
of air flow possibilities. Life each black
grilles (approximately 4/4”) and rotate to the
desired position. Release the grille and
allow it to return to the set position within
the cabinet. By this means air low can be
positioned in any of four directions.
Quick Connect Water Hose
Customer must order one of the four quick
hose kits along with their unit. Each of
these quick connect hose kit will provide
quick and precise water connection to all
Kompac unit.
1) 18” hard pipe kit with dedicated
male NPT fittings.
2) 10-foot hose kit.
3) 20-foot hose kit.
4) 40-foot hose kit.
The 10, 20 and 40-foot hose kit will supply
with hose kit fitting to fit most water faucets
on the water-in line. The water-out and
condensate lines of the three-section flexible
plastic hose can be fed to a sink or
permanent drain.
Service Cord
All Kompac series units are equipped with
LCDI device service cords, which reflects to
the new UL484 standards. The service
cords employed have plug configurations
and receptacle requirements as shown in the
chart below. We strongly recommend user
to follow the plug configurations without
manually altering the pin layout on the plug.
Optional Features
Treated Evaporator Coils
For air conditioning applications
where airborne contaminants are a
problem, acrylic coated evaporator
coils are recommended to guard
against pitting or corrosion.
Remote Control
Optional remote control can provide
extra flexibility to customers. Users
can remotely control all aspect of the
functionality of units (both AC and
Heat Pump unit).

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Installation Instruction
Electrical Requirements
Check the data plate on the back of the unit
to make certain that the proper power is
available within plus or minus 10% of the
rated voltage. Refer to the “Specification”
section for voltage and fuse requirements.
Check for proper wall outlet as described in
“Standard Features”. Operating the unit on
improper voltages will void the warranty.
Water Fitting Location
Prior to placing the air conditioner in the
desired position, note the exact location of
the water fittings on the valve plate on the
unit side panel. Water lines should be
securely attached to water valve plate
fittings, and this will be accomplished easily
though the quick connect hose kit provided
along with the unit per customer’s selection
on the hose kit requirement.

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Unit Operation
Unit Power On:
Plug in the unit to the power source. The
LED display will show the current controller
version number for 0.5 second. Then, the
LED temperature indicator will illuminate
the set point for 5 second and then switch to
the room temperature reading. The Power
RED LED will illuminate. By depressing
any mode button, the Power LED will turn
off.
Fan Hi:
Depress the FAN HIGH button, the unit will
be in fan mode and the evaporator fan
blower will operate at High Speed. The
GREEN LED will illuminate accordingly.
Fan Lo:
Depress the FAN LOW button, the unit will
be in fan mode and the evaporator fan
blower will operate at Low Speed. The
GREEN LED will illuminate accordingly.
Cooling Hi:
Depress the COOL HIGH button; the unit
will be in cooling mode depending on
thermostat reading. The compressor will
turn on based on the thermostat reading and
the Compressor Off Time setting. The
evaporator fan blower will operate at High
Speed. The BLUE LED will illuminate
accordingly.
Cooling Lo:
Depress the COOL HIGH button; the unit
will be in cooling mode depending on
thermostat reading. The compressor will
turn on based on the thermostat reading and
the Compressor Off Time setting. The
evaporator fan blower will operate at Low
Speed. The BLUE LED will illuminate
accordingly.
Heating Hi (Heat Pump Unit):
Depress the HEAT HIGH button; the unit
will be in heating mode depending on
thermostat reading. The reversing valve will
operate to prompt the heat pump mode. The
compressor will turn on based on the
thermostat reading and the Compressor Off
Time setting. The evaporator fan blower
will operate at High Speed. The AMBER
LED will illuminate accordingly.
Heating Lo (Heat Pump Unit):
Depress the HEAT LOW button; the unit
will be in heating mode depending on
thermostat reading. The reversing valve will
operate to prompt the heat pump mode. The
compressor will turn on based on the
thermostat reading and the Compressor Off
Time setting. The evaporator fan blower
will operate at Low Speed. The AMBER
LED will illuminate accordingly.
Temperature Setting:
During any mode of operation, user is able
to change the set point by depressing the
arrow buttons. The temperature indicator
will switch to display “set point
temperature”. By depressing the ARROW
UP or ARROW DOWN button will change
the set point. The SETPOINT LED will
illuminate. The temperature indicator will
switch back to display “room temperature”
after 5 second.
Unit Off:
Depress OFF button at any time to turn the
SYSTEM MODE off. The unit will remain
idle until further instruction. The Power
RED LED will illuminate.
Other Settings:
During the cooling mode, the compressor
will only be energized if the temperature is
at least 2 degrees above the set point, and
de-energized once the temperature falls to 2
degrees below the set point. During the

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heating mode, the compressor will only be
energized if the temperature is at least 2
degrees below the set point, and de-
energized once the temperature rises to 2
degrees above the set point. User is able to
manually change the temperature differential
(default set at 2) by depressing both UP and
DOWN arrow key and then adjust UP and
DOWN arrow to set the differential from 1-
4 degrees. After 3 seconds, it will return to
the room temperature reading.
Compressor Off Time:
Our compressor routine guarantees a 5-
minute minimum off time on the
compressor, and it will not energize until the
5-minute off time has been satisfied.
Self Recovery Mode (*):
Our unit controller is equipped with self-
recovery mode that with any sudden power
interruption, the set point and operating
mode are stored in memory and the unit will
retain these settings and resume operation
once power is restored. When the self-
recovery mode is enabled the decimal point
on the second character on the LED display
is always On. If self-recovery mode is not
enabled that the second decimal point is
always Off. However, the user is able to
enable the “Self Recovery Mode” by
depressing the OFF button for “5 seconds”
and then adjust the setting from the arrow
key.
A0 – Self-Recovery Mode “off” (Factory
Default Setting)
A1 – Self-Recovery Mode “on”
Check Alarms:
The controller will monitor and check the
status of four alarm signals:
1. Alarm_High_Press (E.H),
2. Alarm_Low_Press(E.L),
3. Alarm_Freeze (E.F),
4. Alarm_Temperature_Sensor (E.S).
When E.F, or E.S alarm is present, the
Power LED will blink, signaling that the
alarm condition is present and unit will lock
out. Once the failure is clear, press the OFF
button, the Power LED will stop blinking
and room temperature will display.
Auto Reset High/Low Pressure switch:
If the High Pressure/Low Pressure Switch
trips, "H.P/L.P" is displayed until the failure
clears. Once failure clears the unit goes
back to the previous mode it was in before
the trip. If the High Pressure Switch trips 3
times within 30 minutes, the unit is locked
out, forced into the Off position, and
"E.H/E.L" is displayed on the display and
Power LED will blink, signaling that the
alarm condition is present. Once the failure
is clear, the room temperature will display
and pressing any mode button can manually
reactivate the unit.
Optional Remote Control:
The optional remote control will have the
identical function as the main unit excludes
the followings:
1. Ability to change the “temperature
differential” setting. User can only
adjust such setting through the main
unit panel.
2. Ability to enable or disable the “self
recovery mode” setting. User can
only adjust such setting through the
main unit panel.
* User is only allowed to change setting
when unit is OFF*

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AC Unit Control Panel
Heat Pump Control Panel
Optional Remote Control

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Water Flows at Various Entering Water Temperatures
The rated water flow rate at 85F entering water temperature (E.W.T) is given in the specification
chart earlier in this manual. Water flow rates in that chart will be significantly different from
rated water flow at other entering water temperatures. The variance from rated water flow rate is
found using the graph below. Using your actual E.W.T., multiply the percentage by the
condenser flow rate at 85F E.W.T. to obtain the actual water flow rate required.
For Example:
What is the actual condenser water flow rate at 50F E.W.T. (KPC-14)?
1. The condenser water flow rate at 85F E.W.T. is 3.0 G.P.M. from the Water Flow chart.
2. At 50F E.W.T., the water flow rate percentage would be 25% as seen on the graph.
3. Multiply 0.25 by 3.0 G.P.M. to get an actual water flow rate of 0.75 G.P.M.

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Modes of Operation
Kompac Series conditioners are available in
either a “Cooling Only” or
“Cooling/Heating” model.
The “Cooling” mode directs refrigerant from
the compressor to the water-to-refrigerant
condenser when the dry bulb temperature is
above the desired thermostat setting.
The Heat Pump Model operates in the
cooling or heating modes, depending on
thermostat command. A solenoid activated,
reverse-cycle valve controls the flow of
refrigerant gas through the unit. In the
cooling mode, the solenoid is de-energized
and the refrigerant is directed from the
compressor to the water-to-refrigerant
condenser. If heating is required, the
solenoid coil is energized, reversing the
cycle and directing refrigerant from
compressor to the air-to-refrigerant
condenser, i.e., air-to-refrigerant evaporator
in the cooling mode.
Cooling Unit Heat Pump Unit

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Koolette Unit Construction

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Koldwave 4830 Transport Drive Dallas, Texas 75247
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Kompac Unit Construction

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King Kompac Unit Construction
Blower
Fan Motor
Auto-reset Low Pressure Switch
Auto-reset High Pressure Switch
Water Cooled Condenser
Compressor Contactor
Transformer
Fan Relays
Controller Board
Terminal Blocks
Suction Line
Discharge Line
Rotary Compressor

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INSPECTION AND REPAIR OF
ELECTRICAL SYSTEM
Always disconnect power and discharge
capacitors before servicing.
High and Low Pressure Switch
Check for continuity across terminals 1 and
2 of the pressure switch. At normal pressure
when the unit is not operating, there is
continuity across the two terminals. If
continuity is interrupted across the
terminals, replace the pressure switch.
Compressor Overload Relay
Check for continuity across the overload
relay’s two terminals. At normal room
temperatures, there is continuity across the
two terminals. If no continuity exists,
replace the overload relay.
Compressor and Fan Motor Capacitors
Check visually for bulges or signs of
leakage. A capacitor tester is recommended.
This instrument checks for an open
capacitor, shorts, leaks, grounds, and also
gives direct capacitor reading in mfd.
Inspection and Repair of Refrigerant
Attentively check all connections and every
part for leaks whenever the refrigerant
system is repaired. Use a leak detector or
the halide torch to inspect the system.
When repairing a refrigerant leak, the
brazing flame will cause oxidation to occur
inside the copper tubing being repaired. It is
therefore desirable to use a slightly reduced
flame and to flow dry nitrogen gas through
the refrigerant piping while brazing to
prevent this oxidation from taking place.
Once the repair is completed, thoroughly
evacuate the refrigerant system with a
vacuum pump before recharging the system.
Service Procedures
Before troubleshooting this system, read this
manual to determine electrical power and
installation requirements to allow the spot
cooler to perform at its maximum efficiency.
Refer to general description, wiring
diagrams and photographs to get an
understanding of how the unit functions.
Service other than routine maintenance
should be performed only by a qualified
refrigeration service person. In
service/troubleshooting, there is no
substitute for a good understanding of the
Koldwave modes of operation and control
systems.

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KOLDWAVE KOMPAC SERIES
PROCEDURE FOR PARTS REPLACEMENT
A. Fan Motor
1. Remove the entire cabinet on models
4WK10, 4WK14, and 4WK16. remove
discharge air grilles first. Sides and back
are one piece, with screws located at
bottom of cabinet.
2. For models 4WK23 and 4WK26,
remove cabinet front panel first. Sides,
front and top are one piece with screws
located on the bottom of the cabinet.
3. For all models, remove fan motor wires
from terminal block and fan speed relay.
On Kompac and King Kompac models,
remove screws from blower housings
located by discharge of blower. Remove
locknuts retaining motor to motor base.
Remove motor, blower housings and
blower wheels as an assembly. On
model 4WK07, the cabinet is in two
pieces. Remove front and top first, then
back and sides. All screws are external
and visible. Loosen set screw in blower
wheel. Loosen clamp around motor
housing and remove motor.
4. Install new motor, reversing the
removing procedure.
B. Unit Touch Pad Control
1. For model 4WK07, remove return air
grille and filter. Remove front top panel
and pull away towards left. Disconnect
wiring harness from controls. Lift up
and remove the flexible panel cover.
Loosen the four nuts from behind the
circuit board and remove the board.
Reverse the above process to install the
new circuit board.
2. For models 4WK10, 4WK14, and
4WK16, remove return air grille and
filter. Take off panel on which controls
are mounted by removing two screws on
the left side of the unit by the corner, and
two screws on the bottom of the control
panel. Follow same removal procedure
and controls replacement as described
for model 4WK07.
3. To replace unit touch pad control panel
on models 4WK20 and 4WK26, remove
front panel. Follow same removal
procedure and controls replacement as
described for model 4WK07.
C. Condensate Pump
1. To replace condensate pump on models
4WK07, remove the entire cabinet.
Disconnect pump wire leads from
terminal block. Remove retainer clamp
and tygon tubing. Replace pump,
reversing the above procedure.
2. On models 4WK10 to 16, remove return
air grille, filter and control panel.
Disconnect pump wire leads from
terminal block. Remove Velcro and
tygon tubing. Replace pump, reversing
the above procedure.
3. For models 4WK23 and 4WK26,
remove the front, back and right side
panels only. Follow the same procedure
as described for models 4WK07 to 16 to
replace the pump.
D. Pressure Actuated Water Valve
1. Gain access and disconnect water lines.

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Koldwave 4830 Transport Drive Dallas, Texas 75247
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19
2. Disconnect sensing probe from Shrader
valve on discharge line. Doing it
quickly will minimize the amount of
refrigerant loss.
3. Remove valve from mounting bracket.
4. Install new valve.
MISCELLANEOUS PARTS
REPLACEMENT AND/OR
ADJUSTMENTS
Part Name
A. High and low pressure switch
B. Compressor run capacitor
C. Start capacitor and relay
D. Freeze control
E. Terminal block
Remove return air grille, filter and
control panel and cabinet panels as
described above.
F. Compressor Overload
Remove return air grille, filter and
control panel on Kompac models. Take
off tope/front panel on model 4WK07.
G. Reversing Valve
H. Reversing Valve Solenoid Coil
Remove front return panel on models
4WK10 to 16. Take off back panel on
4WK20 to 26. Remove entire cabinet on
4WK07.

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Koldwave 4830 Transport Drive Dallas, Texas 75247
www.koldwave.com www.mestekparts.com
20
Preventive Maintenance
Kompac Series units have been designed to
give maximum performance and reliability
with minimum maintenance. Maintenance of
the system is concentrated in four areas
covered in the following paragraphs.
1. Blower Motor:
On model K07D, remove the one-piece front
and top cabinet panel to reach the motor. On
models K23-K26D, remove cabinet front
and back panel to reach the motor. Take off
the front louvered panel on models K10-
K16D to gain access to fan motor.
Blower Motor Maintenance:
Caution: Always disconnect power source
before working on or near a motor or its
connected load.
Motor may require periodic cleaning to
prevent the possibility of overheating due to
an accumulation of dust and dirt on the
windings or on the motor exterior.
2. Condensate Pump
Caution: Always disconnect power source
before working on or near the pump.
Pump Maintenance:
Do not touch or clean the sensor device with
sharp objects or tools. The sensor element is
fragile so handle with care. Replace pump if
damaged in any way. If servicing, clean
carefully with a soft brush cloth or under a
slow running tap. Rinse out tray thoroughly.
Do not use solvent based cleaning agents.
Only mild detergents may be used, but rinse
thoroughly before refitting.
Do not use if the pump or its cable is
damaged in any way. Protect cable and
tubing from sharp edges.
3. Coils and Related Items:
Coil Maintenance:
Coil surfaces must be kept clean of dirt and
lint in order to operate at rated efficiency.
Coils should be inspected on a regular basis
and cleaned as required.
CAUTION: solutions used to clean coils
must not be corrosive to metals or
materials used in the manufacture of this
equipment. If cleaning solutions are
applied through means of high pressure
spray, care must be taken to avoid
damaging coil fins and water tube
condenser.
Condensate drain pan and drain system must
be periodically flushed.
4. Filter
The life of a filter depends entirely on its
environment and use. It is recommended
that the filter be inspected on a regular basis
every five to six weeks. A clogged filter
will cause the unit to operate at greatly
reduced efficiency. Pulling filter end cap at
bottom of filter, slightly lifting up and
pulling out can easily remove washable
aluminum air filters located behind the front
panel. The filter must be washed
periodically as needed this may be done as
follows:
1. Soak in solution of warm water and
detergent for 15 minutes.
2. Rinse in clean hot water, and shake
excess moisture from filter.
3. Spray one side of filter with light
film of oil.