Koldwave AIRMASTER 2AK1011 User manual

GENERAL DESCRIPTION
The Koldwave Airmaster is a portable air-cooled zone
cooler which directs cool air to specific areas or
objects through four, adjustable, four-way grilles. Many
small computer and telephone rooms, tanning bed
rooms, laboratories, factories, and numerous areas
can be cooled by its indicated cooling capacity.The
Koldwave Airmaster can also be used for back-up
cooling or as an emergency stand-by unit.
The cord-connected Koldwave Airmaster is provided
with heavy-duty casters.The swivel casters provide
handling ease for convenient relocation.This unit is
completely self-contained with the entire refrigeration
system, electrical components, condenser and
evaporator housed in an attractively-designed, painted
metal cabinet.
NOMENCLATURE
2 A K 10 1 1
Series 1 = 115 Volt
Air Cooled Single Phase
Koldwave Capacity Indicator
2AKSM-3
42-9134 Rev. 4
260 NORTH ELM STREET • WESTFIELD, MA 01085 • Tel No.[phone] • Fax No.[phone]
5211 CREEKBANK ROAD • MISSISSAUGA, ONTARIO L4W 1R3 CANADA • Tel No.[phone] • Fax No.[phone]
GENERAL DESCRIPTION ..................................... 1
PRODUCT DATA AND SPECIFICATIONS......... 2, 3
UNIT DESCRIPTION
Standard Features ............................................... 4-7
General Air Flow Patterns ....................................... 7
ACCESSORIES ................................................. 8-13
APPLICATIONS............................................... 14-15
SERVICE
Installation ............................................................. 15
Checkout of Unit.................................................... 16
Troubleshooting Guide..................................... 16-18
Inspection and Repair ...................................... 19-21
Parts Replacement Procedure ......................... 21-23
Preventative Maintenance..................................... 24
DIAGRAMS
Piping Schematic .................................................. 25
Wiring Diagram (Logic and Interconnecting).... 26-27
Unit Drawing.......................................................... 28
PARTS LIST..................................................... 29-30
WARRANTY......................................................... 31
AIRMASTER
PORTABLE
AIR-COOLED
AIR CONDITIONER
INSTALLATION &
OPERATION
MANUAL

2
KOLDWAVE 2AK (AIRMASTER)
2AK1011 AIRMASTER PRODUCT DATA AND SPECIFICATIONS
COOLING CAPACITY (BTU/HR) & EER
Evaporator Fan Speed High Low
Conditions Total Sensible EER* Total Sensible EER*
67°F DB/57°F WB (54% RH) 9148 6653 9.71 8261 5568 9.31
72°F DB/60°F WB (50% RH) 9627 7113 9.83 8586 5906 9.32
75°F DB/62°F WB (48% RH) 9903 7287 9.86 8867 6103 9.38
80°F DB/67°F WB (52% RH) 10,613 7223 10.13 9749 6051 9.82
95°F DB/75°F WB (40% RH) 11,970 8783 10.00 11,161 7314 9.81
95°F DB/83°F WB (61% RH) 12,985 6021 10.79 11,973 5186 10.42
104°F DB/80°F WB (36% RH)** 12,603 9399 9.67 11,600 7917 9.35
ELECTRICAL DATA***
Voltage/Phase/Hertz 115/1/60
Amperage 10.5
Fuse Size (Amps) 15
Watts 1196
Inrush Current (Amps) 69.7
COMPRESSOR (ROTARY)
Horsepower 0.75
Watts 845
RLA 7.4
LRA 44
RPM 3400
Refrigerant R-22
BLOWER (CONDENSER)
Speed High Low
Amps 1.3 0.8
Watts 139 87
RPM 1570 1115
CFM @ 0.0" H2O E.S.P. 440 300
BLOWER (CONDENSER)
Speed High Low
Amps 2.3 1.6
Watts 250 164
RPM 1090 780
CFM @ 0.0 E.S.P. 730 515
CFM @ 0.25 E.S.P. 610 450
CONDENSATE PUMP (OPTIONAL)
Motor HP .0125
Lift (Ft. of H2O) 11.0
Amps .48
Watts 50
EVAPORATOR
Number of Rows 2
Coil Face Area (Ft.2) 1.5
CONDENSER
Number of Rows 3
Coil Face Area (Ft.2) 2.44
EVAPORATOR AIR FILTER SIZE (INCHES)
Width 15.125
Height 18
Thickness 0.5
CONDENSER AIR FILTER SIZE (INCHES)
Width 19.25
Height 16.5
Thickness 0.5
UNIT DIMENSIONS (INCHES)
(A) Height with Casters 34.25
(B) Height without Casters 31.125
(C) Length 25
(D) Depth 24
NET UNIT WEIGHT (LBS.) 182
SHIPPING WEIGHT (LBS.) 207
Time delay fuses and circuit breakers are recommended.
*EER determined with condenser discharge air ducted into another area on high fan speed.
**Maximum operating condition.
***Electrical ratings per U.L Standard 484 at 95°F DB/75°WB on high speed.

3
KOLDWAVE 2AK (AIRMASTER)
2AK1411M AIRMASTER PRODUCT DATA AND SPECIFICATIONS
COOLING CAPACITY (BTU/HR) & EER
Evaporator Fan Speed High Low
Conditions Total Sensible EER* Total Sensible EER*
67°F DB/57°F WB (54% RH) 10,714 7736 9.44 9409 6216 8.86
72°F DB/60°F WB (50% RH) 11,200 8328 9.47 9933 6586 8.92
75°F DB/62°F WB (48% RH) 11,534 8538 9.49 10,238 6795 8.93
80°F DB/67°F WB (52% RH) 12,606 8375 9.92 11,262 6757 9.32
95°F DB/75°F WB (40% RH) 14,054 10,248 9.63 12,783 8069 9.20
95°F DB/83°F WB (61% RH) 14,917 6986 10.07 14,054 5902 9.88
104°F DB/80°F WB (36% RH)** 14,668 11,203 9.21 13,626 8725 8.95
ELECTRICAL DATA***
Voltage/Phase/Hertz 115/1/60
Amperage 13.8
Fuse Size (Amps) 20
Watts 1563
Inrush Current (Amps) 79.7
COMPRESSOR (ROTARY)
Horsepower 1.0
Watts 1080
RLA 9.7
LRA 54
RPM 3400
Refrigerant R-22
BLOWER (CONDENSER)
Speed High Low
Amps 1.4 0.8
Watts 134 89
RPM 1595 1053
CFM @ 0.0" H2O E.S.P. 400 265
BLOWER (CONDENSER)
Speed High Low
Amps 2.3 1.6
Watts 250 164
RPM 1090 780
CFM @ 0.0 E.S.P. 730 515
CFM @ 0.25 E.S.P. 610 450
CONDENSATE PUMP (OPTIONAL)
Motor HP .0125
Lift (Ft. of H2O) 11.0
Amps .48
Watts 50
EVAPORATOR
Number of Rows 3
Coil Face Area (Ft.2) 1.5
CONDENSER
Number of Rows 3
Coil Face Area (Ft.2) 2.44
EVAPORATOR AIR FILTER SIZE (INCHES)
Width 15.875
Height 18
Thickness 0.5
CONDENSER AIR FILTER SIZE (INCHES)
Width 19.25
Height 16.5
Thickness 0.5
UNIT DIMENSIONS (INCHES)
(A) Height with Casters 34.25
(B) Height without Casters 31.125
(C) Length 25
(D) Depth 24
NET UNIT WEIGHT (LBS.) 185
SHIPPING WEIGHT (LBS.) 210
Time delay fuses and circuit breakers are recommended.
*EER determined with condenser discharge air ducted into another area on high fan speed.
**Maximum operating condition.
***Electrical ratings per U.L Standard 484 at 95°F DB/75°WB on high speed.

4
KOLDWAVE 2AK (AIRMASTER)
STANDARD FEATURES/UNIT CONSTRUCTION
FEATURES
• Optional 10' flexible duct extends
up to 10 feet to vent condenser
air.
• Four way adjustable grilles
control air discharge for even,
comfortable cooling.
Back Right
Side
1
2
3
4
Front Left
Side
5
6
7
8
9
10
SERVICEABILITY
The Koldwave Airmaster has removable panels to
provide full service accessibility.The interior is divided
into three sections.The upper front face encloses the
evaporator coil and blower assembly. The lower front
section contains the electrical controls, which are
secured to the removable front panel, and the
condensate holding tank an its level detection system.
The rear section encases the compressor, condenser
coil and blower assembly.
1. Evaporator Coil
2. Terminal Block Enclosure
3. Condensate
Holding Tank
4. Condenser Fan Motor
5. Fan Motor Capacitor
6. Condenser Coil
7. Compressor (Rotary)
8. Compressor Capacitor
9. Evaporator Blower
10. Casters
• Convenient control panel houses
on-off switch, thermostat and
indicator lights.
• Hinged panel allows easy access
to 5-gallon condensate holding
tank.
• Large, heavy-duty casters allow
you to move the Koldwave®
Airmaster to virtually any location.

5
KOLDWAVE 2AK (AIRMASTER)
CABINET
The Koldwave Airmaster cabinet is constructed of 20
gauge, cold rolled steel with painted steel finish for
corrosion protection. It is lined with thermal and sound
absorbent insulation material in the discharge area
and vibration dampening on all panels.
SAFETY ENGINEERED
In addition to the rotary compressor’s overload
protection, Koldwave Airmaster incorporated, within
the refrigeration system a manual reset high pressure
switch for maximum safety of the compressor. The cut-
out pressure setting is 375 ±10 psig. In the event that
the high pressure switch setting is exceeded, the
compressor and condenser fan operation will cease.
The compressor and condenser fan can be restarted
by depressing the “reset” button located on the back
panel of the unit.The high pressure switch capillary
line screws onto an access valve on the refrigeration
discharge line to make it possible to remove or replace
a defective control without disturbing the refrigeration
system.The unit also employs an automatic reset
freeze control, located on top of condenser coil, to turn
the entire unit off at low ambients and defrost the
evaporator coil for approximately five minutes.
NOTE:Wait two minutes before restarting unit after
tripping by one of the safety features.
1. Nameplate
2. H.P.C. Reset Button
3. Condenser Filter
4. Service Cord
RELIABLE CONTROLS
The self-contained unit maintains the desired amount
of cooling, which can be selected by adjusting the
thermostat to warmer or cooler.The thermostat
sensing bulb is in the return air stream behind the
louvered return air grille and return air filter.The range
of the thermostat is from 65-100°with a differential of
±3°F.
The three-position, mode selector rocker switch,
located in the front panel, has three functions:
1. To provide fan only operation when depressed to
the right.
2. To turn the unit off when set in the center position.
3. To activate the cooling mode when depressed to
the left.
The blue colored light above the thermostat indicates
the thermostat is calling for cooling mode operation.
Compressor may or may not be on, depending on the
thermostat setting. The red, “tank full” warning light
indicates condensate tank is full and needs to be
emptied.The two-position, fan-speed rocker switch,
located below the mode selector switch, provides high
fan speed when depressed to the right and low speed
when depressed to the left.
1
2
3
4
Back
Rear of
Front Panel
Thermostat
Bulb
Mode
Selector
Switch
Convenient Control Panel
Thermostat
Fan
Speed
Switch
Cooling Mode
Indicator (Blue) Tank Full
Indicator (Red)

6
KOLDWAVE 2AK (AIRMASTER)
DISCHARGE AIR GRILLES
The Koldwave Airmaster is equipped with (4) 5" x 5",
four-way adjustable, plastic grilles, located in the upper
front panel, enabling a variety of air flow possibilities.
Pull out each black grille (approximately 3/4") 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 flow can be positioned in any four
directions.
CONDENSATE RESERVOIRTANK
The Koldwave Airmaster incorporates a 5.0 gallon
capacity, polyethylene, condensate drain tank, located
in the lower, front section of the unit. A high water cut-
out switch is used to stop the entire unit’s operation
automatically when the tank is full of water. An
adjustment screw is provided to set the desired
condensate level where the unit cuts out.Turn screw
clockwise to lower water level and thus decrease the
tank’s weight for emptying.To prevent spillage, the
tank is equipped with a cap, which is chained to the
top of the tank, and a vent for easy drainage.
CAUTION:Turn unit off before emptying tank when
tank light is illuminated.
SERVICE CORD
The six foot service cord employed in Model
2AK1411M will not fit in the standard household
receptacle. Required is a 20A-125 volt NEMA 5-20
receptacle.Model 2AK1011 uses a standard 15 amp
plug.
Adjustable
Air Grilles
PLUG END TERMINATION
JACKET
RECEPTACLE
20A - 125V
NEMA 5-20R

7
KOLDWAVE 2AK (AIRMASTER)
1. Evaporator Fan Motor
2. Control Enclosure
3. Terminal Block Enclosure
4. Condensate Pump Assembly (Optional)
1
2
3
4
AIR FILTERS
The Koldwave Airmaster employs two, 1/2" thick,
washable aluminum mesh air filters, located behind
the louvered front (evaporator) panel and beneath the
back (condenser) panel.The evaporator filter can be
easily removed and cleaned; just pull the filter end cap
at the bottom of filter and slide out.The condenser
filter is removed by lifting the tab at bottom of filter,
then pulling toward you and down.
GENERAL AIRFLOW PATTERNS
Condenser air is drawn in through the lower rear
section of the unit and passes through the condenser
coil and extracts heat.The hot air is blown out the
upper exhaust air opening. Evaporator air is taken
through the lower, front, louvered panel and is cooled
by the evaporator coil. It’s then blown in through four,
adjustable, four-way grilles, enabling a variety of
airflow possibilities. Both condenser and evaporative
air inlets are provided with filters.
ELECTRICAL
Electrical control is concentrated in an enclosed area
behind the control panel. Electrical interconnection is
achieved via a multi-position terminal strip located in a
junction box fastened to the bulkhead wall.

8
KOLDWAVE 2AK (AIRMASTER)
ACCESSORIES

9
KOLDWAVE 2AK (AIRMASTER)
CEILING PANEL/DUCT KIT ASSEMBLY
(OPTIONAL)
A 10" diameter, flexible duct kit assembly extends up
to 10 feet, to vent condenser air or to draw condenser
return air from the ceiling when condenser return air
plenum is used. It comes with 2' x 2' lay-in ceiling
panel/collar assembly, for venting into the plenum area
above the false ceiling, plus a duct collar to attach duct
to unit. Installation of the flexible duct can be achieved
in the following manner:
1. Slip one end of the duct over the lay-in ceiling
panel/collar assembly and other end over the unit
duct collar.
2. Clamp duct to lay-in ceiling panel/collar assembly
and unit duct collar (see “Duct Design” for details.
3. Place the 2' x 2' lay-in ceiling panel in the false
ceiling directly above the unit.
4. Screw duct collar to unit with four screws provided.

10
KOLDWAVE 2AK (AIRMASTER)
DUCT DESIGN
Condenser Duct
Should a longer 10" diameter duct be needed on the
condenser discharge, 10 foot flexible ducts may be
coupled together up to a maximum equivalent length
of 60 feet (allow 6 feet for every 90°bend).
1. 1/4 Turn Pawl
Latch Fasteners
2. Mounting Plate
3. Snozzle Caps
4. Insulation
5. Snozzle Duct
4
21
3
5
Duct Clamps
Two 10" diameter wire duct clamps are used to secure
the condenser air exhaust duct to the lay-in ceiling
panel/collar assembly and the Koldwave Airmaster
exhaust duct collar.
DISCHARGE AIR SNOZZLE®KIT ASSEMBLY
(OPTIONAL) SA040-D-028
A 20 gauge painted steel air discharge snozzle®
mounting plate assembly can be furnished as an
optional item. Its purpose is to accommodate various
spot cooling applications, where air can be aimed and
concentrated on the object to be cooled.The plate is
designed with two 4" diameter, 16" compressed and
22" long extended flexible air duct snozzles®.The use
of the snozzles®will derate the capacity by
approximately 13%.The snozzle®plate is mounted
over the evaporator air discharge opening by 1/4 turn
Pawl Latch fasteners for each removal. It is secured in
place by tightening the four fasteners provided with the
plate assembly. It can be removed easily by turning
the fastener on quarter turn counter-clockwise.
10" Diameter Duct Clamp SA019-A-067

11
KOLDWAVE 2AK (AIRMASTER)

12
KOLDWAVE 2AK (AIRMASTER)
CONDENSATE RETURN AIR
PLENUM (OPTIONAL) SA076-D-2273
A 20 gauge, painted steel,
condenser return air plenum can
be furnished for applications of the
Koldwave Airmaster as a room air
conditioner.This plenum is
designed for use with a flexible
duct kit assembly.The duct collar
of the duct kit assembly can be
secured with four screws over a
10" diameter hole in the top of the
plenum.The duct can then be
connected to the lay-in ceiling
panel, so condenser return air is
drawn from the false ceiling above
the unit.
The plenum is mounted to the
condenser air intake by sheet
metal screws. A filter frame is
incorporated in its design to allow
easy removal of the filter for
cleaning from the right side of the
unit.The filter frame is made to
accept the unit’s standard
condenser air filter with the filter
handle relocated from the bottom
to side of filter at installation.
NOTE: See “Application” section
for typical installation.

13
KOLDWAVE 2AK (AIRMASTER)
CONDENSATE PUMP KIT (OPTIONAL) SA057-D-042
A condensate pump, capable of pumping against an
11 foot head, can be installed for positive removal of
evaporator condensate. This kit is a convenience for
those who do not wish to empty the five gallon
condensate tank periodically, especially for units with
permanent installation.At the condensate pump, a
check valve is inserted in the hose and secured by
plastic clamps.The installation can be accomplished
by following the simple steps outlined in “procedures to
install condensate pump kit assembly”.
PROCEDURETO INSTALL
CONDENSATE PUMP KIT ASSEMBLY
1. Disconnect unit from power source.
2. Pull out clear plastic drain hose from inside of tank
and remove tank from hinged tray.
3. Mount pump kit assembly in hinged tray using the
two holes provided in the tray flange facing front
panel by using the two machine screws and hex
nuts.
4. Route clear plastic hose from pump through a hole
in the bulkhead below the terminal strip enclosure
and up to another hole located in the left rear frame
angle. Both holes are plugged by knockout buttons
which should be removed. Fit a 1-1/8" O.D. rubber
grommet into the hole in bulkhead prior to inserting
plastic hose through it.
5. Insert a 3/8" MF pipe connector into 1" O.D. steel
washer and into the left rear frame angle. Lock
connector in the frame angle with a locknut.
6. Screw tightly the 3/8" FPT x 3/8" plastic hose barb
into the 3/8" MF pipe connector.
7. Insert plastic hose from pump into hose barb and
clamp with a #30 nylon hose clamp.
8. Connect pump wire leads to terminal strip positions,
number 1 and 2.
9. Insert plastic drain hose from evaporator pan into
the drain tube clamp provided in the pump kit
assembly (see the drawing).

14
KOLDWAVE 2AK (AIRMASTER)
APPLICATIONS
ZONE COOLER
Koldwave Airmaster can be employed in an open
environment as a zone cooler to cool a specific object
which the evaporator grilles or the optional snozzles®
direct the air toward. In this application, ducts for
condenser air intake and hot air exhaust are not
required. Zone cooling provides convenient,
economical and energy efficient air conditioning in
areas where cooling the entire environment is
impractical. It directs cool air only where aimed and
needed without wasting it elsewhere. Note that even
though the object is cooled with a concentrated air
supply, the surrounding area will slightly be heated up
by the condenser’s hot exhaust air. Cooling tanning-
bed rooms, beauty parlors and vehicle maintenance
department are just a few areas that can benefit from
this application.The figure below shows a typical
example of how the unit can be applied.
AREA COOLER
In a similar application where a specified area needs
to be cooled a condenser hot air exhaust duct may be
employed as shown in the figure below. Refer to
(optional) “Flexible Duct Kit Assembly” for more
details. Evaporator discharge grilles (as standard) or
optional snozzles may be used.
While evaporator discharge air cools the air directly in
front of the unit, warm room air will be drawn into the
rear of the unit to cool the condenser and then
discharged into the false ceiling.The net effect will be
a cooler area all around the unit.
When installed in an enclosed area used as a room air
conditioner, the Koldwave Airmaster will require make-
up air for condensing.A return air plenum and return
air ducting are available to supply condensing air from
outside the conditioned space.

15
KOLDWAVE 2AK (AIRMASTER)
ROOM AIR CONDITIONER
Koldwave Airmaster may also be used as a room air
conditioner to cool the entire enclosed space it is
placed in. In this application, hot exhaust air venting
and condenser air intake ducting are definitely needed.
This can be accomplished by employing the “Flexible
Duct Kit Assembly” (optional) and the “Condenser
Return Air Plenum” (optional) as specified in the
“Optional Features” section. See figure below for
orientation of flexible ducts.
The condenser coil is cooled by the air drawn from the
false ceiling.The air passes through the hot condenser
coil, gets heated up, then discharges to an area
outside the room being cooled (outdoors).
INSTALLATION INSTRUCTIONS
Before installing: Check the air conditioner/spot cooler
for any shipping damage. Air conditioners are
thoroughly inspected at the factory and carefully
packed. If any damage is evident, file a claim with the
delivering carrier immediately.
Electrical requirements: Check the data plate on the
unit to make certain that the proper power is available.
Refer to “Specifications” section for voltage, fuse
requirements and proper NEMA receptacles. Check for
proper wall outlet as described in “Standard Features”
section. Operating the unit on improper voltages will
void the warranty.
CAUTION: An extension cord can be used provided
it is rated at least 20 amps @ 115 volts with
grounding-type attachment plug and grounding type
connector (load fitting).
Koldwave Airmaster portable air conditioner/spot
cooler requires minimal installation. It merely plugs
into a NEMA 5-20R receptacle for 2AK1411M or 5-15R
for 2AK1011 and immediately begins to cool.The
entire system is built into one compact unit which can
be moved and installed easily.

16
KOLDWAVE 2AK (AIRMASTER)
CHECK OUT OF UNIT OPERATION
Koldwave Airmaster portable spot cooler provides fan
only air circulation and cooling modes.This is
accomplished by setting the controls to operate in any
of the following:
Fan Only
Plug unit in. Depress the upper mode selector switch
to the right for fan operation. Depress the lower fan
speed selector switch to the left for low fan speed and
to the right for high speed.
TROUBLESHOOTING GUIDE
SERVICE PROCEDURES
Always disconnect power and discharge capacitors
before servicing. 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
Airmaster modes of operation, control systems,
components and safety systems (see service
performance chart).
SYSTEM PERFORMANCE CHART
The chart below shows suction and discharge
pressures (PSIG), plus total amp draw with evaporator
fan on high speed, with condenser motor on high
speed and with condenser blower baffle.The
condenser discharge air is ducted into another area
with a 10" diameter, 10' long flexible duct.
AmbientTemperatures Versus
Suction and Discharge Pressures
Discharge
Pressure
317
271
277
216
198
187
171
321
290
282
224
207
193
178
Room
Conditions
104°F DB/80°F WB
95°F DB/83°F WB
95°F DB/75°F WB
80°F DB/67°F WB
75°F DB/62°F WB
72°F DB/60°F WB
67°F DB/57°F WB
104°F DB/80°F WB
95°F DB/83°F WB
95°F DB/75°F WB
80°F DB/67°F WB
75°F DB/62°F WB
72°F DB/60°F WB
67°F DB/57°F WB
Suction
Pressure
104
100
93
78
71
69
65
93
79
93
79
71
68
63
Total
Amps
11.5
10.6
10.5
9.2
8.8
8.6
8.3
13.9
12.9
12.7
11.1
10.6
10.3
9.8
Model
2AK1011
2AK1411M
Use the above chart for reference when suction and discharge
pressure and total amps are a determining factor in analyzing the
problem.Refer to troubleshooting guide when above data can be
useful in determining overcharge or undercharge of unit.
Cooling Cycle
Depress the upper mode selector switch to the left for
cooling. Set the thermostat knob below actual room
dry bulb temperature level. Blue colored light located
next to the upper rocker switch on the panel should
illuminate, indicating the cooling mode of operation.
Allow unit to run fan speed set on high for twenty
minutes. Record temperature of air entering filter and
temperature of air leaving the discharge grille. In a
room of approximately 80°F dry bulb, air temperature
coming from the grille should be approximately 15°F
cooler than air returning to filter.This cycle reduces the
dry bulb temperature and it lowers the wet bulb
temperature by condensing water on the cooling coil
surface.The red colored light located next to the blue
colored light on the panel should illuminate when
condensate tank is full. Refer to “Condensate
Reservoir Tank” section.

17
KOLDWAVE 2AK (AIRMASTER)
TROUBLE SHOOTING GUIDE continued
PROBLEM SYMPTOM POSSIBLE CAUSE REMEDY
Entire unit does not
operate.
Unit starts, but stops
immediately.
Unit operates, but
stops after a few
minutes.
Insufficient air flow
through evaporator.
Evaporator discharge
air not cool.
Compressor motor not
running.
Evaporator blower
motor not running.
1. Power Interruption.
2. Defective tank full unit cut-
out switch.
3. Condensate tank could be
full, but red light might be
defective.
1. Defective compressor
overload relay.
2. Defective compressor motor.
3. Defective run capacitor.
1. Defective compressor motor.
2. Defective overload relay.
3. Defective high pressure
switch.
4. Loose connection in
electrical circuit.
5. Manual reset button out on
HPC.
6. Unit overcharged.
7. Dirty condenser coil and
filter.
8. Condensate tank right at trip
point.
9. Condenser fan running at
high ESP.
1. Improper size of unit.
1. Dirty air filter in unit.
2. Dirty evaporator or
condenser.
3. Ice on evaporator coil.
4. Obstructed intake.
5. Defective condenser fan
motor or its capacitor.
1. Refrigerant leak.
1. Defective compressor motor.
2. Defective compressor
capcitor.
3. Defective overload relay.
4. Defective thermostat.
5. Defective wiring connection.
6. Defective wiring.
1. Defective fan motor.
2. Defective fan motor
capacitor
3. Defective wiring connection.
4. Defective fan speed switch.
5. Defective thermostat.
1. Check external power supply.
2. Check and replace.
3. Check tank and replace red
light if defective.
1. Replace after checking current.
2. Remove and replace.
3. Check and repalce.
1. Check and replace.
2. Replace after checking current.
3. Check cut-out setting and
replace if defective.
4. Trace loose wire(s) and firm up
connection.
5. After diagnosing and correcting
cause for unit trip out, begin
unit operation by depressing
the red button located in the
back panel.
6. Purge some refrigerant.
7. Clean filter and condenser coil.
8. Empty tank.
9. Check fan speed and correct.
1. Check if the unit is undersized
for the load, Add supplemental
unit(s).
1. Clean air filter.
2. Unusual condition requires
cleaning.
3. Defrost. Use fan only by
depressing the upper rocker
switch to right.
4. Remove obstuction.
5. Check and replace.
1. Locate leak and repair.
Evacuate and recharge.
1. Check and replace.
2. Check and replace.
3. Check and replace.
4. Check and replace.
5. Check and repair.
6. Check and replace.
1. Check and replace.
2. Check and replace.
3. Check and repair.
4. Check and replace.
5. Check and replace.
Unit does not
operate.
Insufficient cooling.
No cooled air discharge.

18
KOLDWAVE 2AK (AIRMASTER)
PROBLEM SYMPTOM POSSIBLE CAUSE REMEDY
Room air temperature
discharged through
grilles.
1. Low voltage to unit.
2. Defective motor capacitor.
3. Blower wheel rubbing
against housing.
1. Low voltage to unit.
2. Thermostat.
3. Loose or defective wires.
4. Stuck compressor.
5. Compressor shorted, open
or burned.
6. Shorted or open run
capacitor.
7. HPC holding unit off.
1. Loose compressor mounting
nuts.
2. Defective, improper or worn
rubber grommets on the
compressor mounting bolts.
3. Copper Tube vibrating.
4. Loose cabinet or internal
component
5. Loose blower wheel.
6. Blower wheel hitting shroud.
7. Blower bearing defective.
1. Leaking evaporator or
condensate pan.
2. Dirty evaporator coil.
3. Defective drain hose
(clogged or loose
connection).
4. Defective microswitch
causing condensate tank to
overflow.
5. Hole or crack in condensate
tank.
1. Determine reason and correct.
2. Replace capacitor.
3. Inspect wheel alignment and
correct.
1. Check power supply for proper
voltage at unit; ±10% of rated
nameplate voltage.
2. Check the temperature control
for loose wires. Firm any loose
connections. Replace if
defective.
3. Tug on wires to see if they will
separate from connections.
Replace terminals if necessary.
4. Try a start capacitor across the
run capacitor momentarily
(three seconds).
5. Check for shorts, opens and
grounds. Remove and replace
compressor.
6. Remove and replace.
7. Check condenser fan.
1. Tighten.
2. Replace.
3. Adjust by bending slightly to
firm position. Separate tubes
touching cabinet or each other.
4. Check and tighten loose
screws.
5. Tighten scres on blower wheel
to shaft.
6. Adjust wheel position on motor
shaft.
7. Replace blower motor.
1. Locate leak and repair pan.
2. Check to see if the elevation is
over 11 ft. (if it is over 11 ft., a
larger condensate pump is
required). Otherwise, replace
pump if defective. Pump will
operate properly against 11 ft.
of water total head pressure on
pump. If combination of vertical
height and horizontal drain line
exceeds 11 ft.of water
pressure drop, problems may
arise.
3. Repair or replace.
4. Remove and replace.
5. Remove and replace.
Evaporator blower not
running up to full speed.
Evaporator fan runs,
but compressor does
not start.
Abnormal noise.
Water leaking from unit

19
KOLDWAVE 2AK (AIRMASTER)
INSPECTION AND REPAIR OF ELECTRICAL SYSTEM
Always disconnect power and discharge capacitors
before servicing.
Thermostat
Check for continuity across terminals 1 and 2 of the
thermostat. At normal temperature (65°F or higher)
there is continuity across those two terminals. If
continuity is broken across the terminals, replace the
thermostat.
Fan/Off/Cool/Switch
At each position of the fan/off/cool switch, there should
be continuity across the following terminals.
Switch Conducting
Position Terminals
Off None
Fan Center and Left
Cool Center and Right
If there is no switch continuity in the fan and cool
position, replace the switch.
Fan Speed Switch
Switch Conducting
Position Terminals
High Speed Center and Left
Low Speed Center and Right
There should be continuity across the above terminals.
If none, replace switch.
Tank Full Unit Cut-Out Switch
Depress the microswitch to check for continuity. If
there is no continuity between common and normally
open terminals, replace the switch.
High Pressure Switch
Check for continuity across terminals 1 and 2 of the
high 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 high pressure switch.
Cut-out pressure – 375 psig
Cut-in (restart) pressure – 275 psig
Compressor Motor
Measure resistance across the terminals of the
compressor motor.
Resistance between C-R at 70°F
approximately 0.65 OHMS ±10%
Resistance between C-S at 70°F
approximately 4.50 OHMS ±10%
Replace compressor when resistance is not at the
stated values.
Compressor Overload Relay
Check for continuity across overload relay’s tow
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
Before and after the test, always short across two
terminals to discharge electrostatic charges. Set the
ohmmeter to 100 OHMS range and place its two
probes against the two terminals of the capacitor. At
first, the ohmmeter should indicate zero OHMS, then
the meter reading should gradually approach infinity. If
the ohmmeter shows infinity from the outset or the
meter reading does not move from zero OHMS,
replace the capacitor.
Condenser Fan Motor
Measure resistance across the terminals of the fan
motor.
Resistance across white and black
7.42 OHMS ±10% at 25°C
Resistance across red and black
11.94 OHMS ±10% at 25°C
Resistance across white and red
19.36 OHMS ±10% at 25°C
When resistance is not within these stated values,
replace the fan motor.

20
KOLDWAVE 2AK (AIRMASTER)
Evaporator Fan Motor
Resistance across white and black
22.5 OHMS ±10% at 25°C
Resistance across red and black
26.2 OHMS ±10% at 25°C
Resistance across white and red
48.7 OHMS ±10% at 25°C
When the resistance is not within these stated values,
replace the fan motor.
Condensate Pump Motor (optional)
Measure resistance across the terminals of the pump
motor. 31.0 OHMS ±8% at 25°C. when the resistance
is not within these stated values, replace the pump
motor.
Tank Full and Cooling Mode Pilot Lights
Make a test circuit as shown in figure below. If the light
fails to illuminate, replace it.
CONTROL
ENCLOSURE
TERMINAL BLOCK
ENCLOSURE