Koldfront WTC10002WCO115V, WTC12002WCO115V, WTC10012WCO230V, WTC12012WCO230V, WTC12001W Service Manual

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EdgeStar, 8606 Wall St, Suite 1800, Austin, TX 78754

support.edgestar.com • service@edgestar.com • edgestar.com

*Warranty service should be performed by an authorized service representative only.

SERVICE MANUAL

Koldfront Through the Wall Air Conditioner

MODELS COVERED:

WTC8001W WTC12001W WTC8002WCO WTC10002WCO115V WTC10012WCO230V WTC12002WCO115V WTC12012WCO230V

WTC14012WCO230V

Document Type: Service Manual Version: V1.0 04112018

CAUTION: READ ALL SAFETY PRECAUTIONS IN THIS MANUAL BEFORE SERVICING THE UNIT

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CONTENTS

CONTENTS ....................................................................................................................................... 1

SAFETY PRECAUTIONS ..................................................................................................................... 2

ELECTRICAL SAFETY ..................................................................................................................... 3

GENERAL SAFETY ......................................................................................................................... 4

1 EXPLODED DIAGRAMS AND PART LISTS ...................................................................................... 5

1.1 WTC8001W AND WTC12001W ............................................................................................. 5

1.2 WTC WCO MODELS ............................................................................................................... 7

1.3 DIMENSIONS ......................................................................................................................... 9

2 WIRING DIAGRAM (ALL MODELS) .............................................................................................. 10

3 MAIN COMPONENTS.................................................................................................................. 11

3.1 MAJOR PARTS ..................................................................................................................... 11

3.2 ELECTRONIC CONTROL BOX AND MAIN PCB ...................................................................... 11

4 UNIT OPERATION ....................................................................................................................... 12

4.1 DISPLAY PANEL CONTROLS ................................................................................................. 12

4.2 REMOTE CONTROL .............................................................................................................. 14

5 INSTALLATION AND CLEANING .................................................................................................. 15

5.1 PROPER INSTALLATION AND DRAINAGE............................................................................. 15

5.2 CLEANING THE FILTER ......................................................................................................... 16

6 MODES AND OPERATING CONDITIONS ..................................................................................... 17

6.1 TERMS AND DEFINITIONS ................................................................................................... 17

6.2 PROTECTION FUNCTIONS ................................................................................................... 17

6.3 AUTO MODE ........................................................................................................................ 17

6.4 FAN-ONLY MODE ................................................................................................................ 17

6.5 COOLING MODE .................................................................................................................. 18

6.6 AUTO-DEFROST FUNCTION ................................................................................................. 18

6.7 DRY MODE ........................................................................................................................... 19

6.8 SLEEP MODE ........................................................................................................................ 19

7 TROUBLESHOOTING ................................................................................................................... 20

7.1 TROUBLESHOOTING GUIDE ................................................................................................ 20

7.2 ERROR CODES AND SENSOR MALFUNCTIONS .................................................................... 21

7.3 TEMPERATURE SENSOR RESISTANCE TEST TABLE .............................................................. 22

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SAFETY PRECAUTIONS

WARNING: This manual and the information contained herein is intended for use by certified technicians. The manufacturer or seller is not responsible for the interpretation or misuse of the information provided, nor does it assume any liability in connection with its use.

The safeguards and warnings indicated in this manual do not cover all possible conditions which may occur. Common sense, caution, and care must be exercised.

 To prevent electric shock, always unplug an appliance from the power supply before attempting

any service.

 Disconnect the power cord by grasping the plug, not the cord.  Do not bypass, cut, or remove the grounding plug.  Prevent water from spilling onto electric elements or the machine parts.  Always refer to the rating label on the appliance for rated current and voltage.  Always check line voltage and amperage.  Always use exact replacement parts.  Any attempt to repair a major appliance may result in personal injury and property damage.

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Electrical Safety

 Do not exceed the power outlet ratings.  It is recommended that the unit be connected to its own circuit.  A standard electrical supply that is properly grounded in accordance with the National Electrical Code

and all state and local codes and ordinances is required.

 Do not use outlets that can be turned off by a switch or pull chain.  Always turn the unit off and unplug it from the outlet when cleaning.  Unplug the unit if it is not going to be used for an extended period of time.  Do not operate the unit with a power plug missing the ground plug, a damaged cord, or a loose socket.  Be sure the appliance is properly grounded.  Do not bypass, cut, or remove the grounding plug.  If the power cord is damaged, it must be replaced by the manufacturer or a qualified technician.  Do not use extension cords or power strips with this unit. You may need to contact an electrician if it is

necessary to use a longer cord or if you do not have a properly grounded outlet. Do not modify the power cord’s length or share the outlet with other appliances.

 Do not start or stop the unit by switching the electrical circuit’s power on and off.  Immediately unplug the unit if it makes strange sounds, emits an odor or smoke and contact customer

service.

 Do not remove any part of the casing unless instructed by an authorized technician.  Before the appliance is removed from service or discarded, remove any doors and cut off the power

cord.

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General Safety

 Always unplug an appliance from the power supply before attempting any service. Disconnect the

power cord by grasping the plug, not the cord.

 Do not allow children or pets to play on or in the appliance.  This machine is not intended for use by persons (including children) with reduced physical, sensory or

mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the machine by a person responsible for their safety.

 Do not install or store this appliance where it will be exposed to the weather.  Disconnect from the power socket before cleaning or maintenance.  If the plug (power cord) is damaged, it must be replaced by the manufacturer or an authorized service

representative.

 This machine shall be repaired only by an authorized service representative. Only genuine

replacement parts should be used.

 If connected to a circuit protected by fuses, use time-delay fuses with this appliance.  Do not lean items against the glass door.  Please do not close the door with excessive force. If it is found difficult to close the door, please check

for obstruction.

 When you plan to dispose of this unit in the future, please comply with the local waste disposal

regulations. Remove any doors so that children and pets will not be trapped in the unit.

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1 Exploded Diagrams and Part Lists

1.1 WTC8001W and WTC12001W

Page 7

No.

Part Name

No.

Part Name

Display assembly

Electric heater

Front panel

Electronic control box assembly

Air outlet assembly

23.1

Capacitor for fan motor

3.1

Air outlet

23.2

Electronic control box

3.2

Horizontal louver

23.3

Transformer

3.3

Connecting rod for louver

23.4

Bracket for main control board

3.4

Horizontal louver

23.5

Main control board assembly

Evaporator coil assembly

23.6

Power cord

4.1

Evaporator

23.7

Defrost sensor assembly

4.3

Capillary tube assembly

23.8

Ambient temperature sensor assembly

Discharge pipe assembly

23.9

Heater temperature sensor assembly

Compressor

23.11

Capacitor for compressor

Remote control

Cover for electronic control box

Condenser

Condenser water tray

Axial flow fan

Chassis assembly

Rear separating housing

Drain valve

Fan motor

Grille

Front separating housing

Grille

Cabinet

Installation accessories

Rear volute shell

30.1

Upper and lower shutter frame

Heat insulation

30.2

Left and right shutter frame

Centrifugal fan

30.3

Rear grille

Front volute shell

30.4

Plastic net

Air filter

Filter guide

Box for electric heater

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1.2 WTC WCO Models

Page 9

No.

Part Name

No.

Part Name

Display assembly

Electrical heating box (for units with heat)

Front panel

Electronic control box assembly

Air outlet assembly

23.1

Capacitor

3.1

Air outlet

23.2

Electrical control box

3.2

Horizontal louver

23.3

Transformer

3.3

Connecting rod for louver

23.4

Mounting rack for main control panel

3.4

Horizontal louver

23.5

Main control board

Evaporator assembly

23.6

Power supply cord

4.1

Evaporator

23.7

Defrost temperature sensor

4.3

Capillary tube assembly

23.8

Room temperature sensor

Compressor exhaust pipe assembly

23.11

Compressor capacitor

Compressor

Electrical control box cover

Remote control

Water receiver tray

Condenser

Chassis assembly

Axial fan

Rear grill

Rear barrier assembly

Rear grill

Fan motor

Installation accessories

Front barrier assembly

30.1

Upper and lower shutter frame

Cabinet

30.2

Left and right shutter frame

Rear air duct foam

30.3

Air inlet grille

Centrifugal fan

30.4

Plastic Rear Guard

Front air duct foam

Filter guide

Air filter

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1.3 Dimensions

Width

Height

Depth

WTC UNIT

24-1/4” (615 mm)

14-1/2” (369 mm)

20-1/4” (515 mm)

WTC SLEEVE

25-5/8” (649 mm)

15-1/4” (388 mm)

17-1/2” (445 mm)

Wall Sleeve

Model: WTCSLV

WTC Wall Unit

Page 11

2 Wiring Diagram (All Models)

Note: This wiring diagram is for illustration purposes only. The actual shapes of components may be different. @ indicates optional components that are not included in all models.

Page 12

3 Main Components

3.1 Major Parts

3.2 Electronic Control Box and Main PCB

4 Operating Instructions

4.1 Display Panel Controls

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4 Unit Operation

4.1 Display Panel Controls

On-Off Button

Press to turn on or off the unit. NOTE: The Energy Saver feature will automatically turn on in Cool, Dry, and Auto mode.

Up and Down Button

Press or hold either Up or Down button until desired temperature is seen on the digital display. This temperature will be automatically maintained anywhere between 62 °F (17° C) and 86° F (30° C). Pressing and holding both Up and Down buttons for 3 seconds, will change the display from ℉ to ℃.

Mode select Button

To choose the operating mode press Mode . Each time you press the button a mode is selected in a sequence that goes from Auto, Cool, Dry, to Fan. The indicator light beside the mode button will be illuminated and remain on once the mode is selected.

NOTE: The unit will automatically turn on the Energy Saver function under Cool, Dry, and Auto.

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Fan speed Button

To select the speed of the fan press Fan Speed which cycles through four steps- Auto, Low, Medium, or High. Each time the button is pressed the fan speed mode is shifted.

NOTE: The fan speed is automatically set to low and cannot be adjusted in Dry mode.

Energy Saver Button

To start the Energy Saver feature, press the Energy Saver button. This feature is available on Cool, Dry, and Auto. The fan continues to run for 3 minutes after the compressor shuts off. The fan then cycles on for 2 minutes at 10 minute intervals until the room temperature is above the set temperature, at which point the compressor turns back on and cooling starts.

Timer Button

 When the unit is on or off, press the Timer button and the “Timer On” indicator light illuminates. It

indicates that the Auto Start/Stop program is initiated.

 To switch to off press the Timer button again and the “Timer Off” indicator light illuminates. It

indicates that the Auto Stop program is initiated.

 Press or hold the Up or Down button to change the Auto Time by ½ hour increments up to

10 hours or 1 hour increments up to 24 hours. The control will count down the time remaining until start.

 The selected time will display for five (5) seconds and then will automatically revert back to display

the previous temperature setting or room temperature when the unit is on.

 Turning the unit ON or OFF at any time or adjusting the timer setting to 0.0 will cancel the Auto

Start/Stop program.

 The timer is not a permanent setting. The user must set the timer each they wish to use it.

Sleep Button

To initiate, press the Sleep button. In this mode the selected temperature will increase by 2°F (1°C) 30 minutes after the mode is selected. The temperature will then increase by another 2°F (1°C) after an additional 30 minutes. This new temperature will be maintained for 6 hours before it returns to the originally selected temperature. This ends the Sleep mode and the unit will continue to operate as originally programmed. The Sleep Mode program can be cancelled at any time during operation by again pressing the Sleep button.

Check Filter Button

This feature is a reminder to clean the Air Filter for more efficient operation. The LED light will illuminate after 250 hours of operation. To reset after cleaning the filter, simply press the Check Filter button

and the light will go off.

Page 15

4.2 Remote Control

 The remote control has an operating range of 16 ft. from the appliance.  The remote signal receiver/sensor is located on the control panel of the air conditioner.  Reception of signal commands is confirmed by an audible beep.  Direct sunlight can interfere with the infrared signal.  To replace batteries, remove the back cover by pressing where indicated and sliding off the battery

cover.

Page 16

5 Installation and Cleaning

5.1 Proper Installation and Drainage

Older Koldfront window air conditioners included a drain plug that could be removed to assist with water drainage in excessively humid operating environments. Current models DO NOT use drain plugs. WAC series air conditioners were modified to increase unit operating efficiency and as a result the drain hole and plug have been removed.

As water builds up towards the rear / back of the unit the fan blade will begin to splash and disperse that water over the condenser coils which significantly aids in cooling the internal components and increases the overall efficiency of the unit. If there is an over-accumulation of water, it will simply drain out of the lower back edge of the unit onto the exterior ground. Provided that the unit has been installed properly with a slight rearward slope as indicated below, there will not be drainage issues with the unit.

Service Note: Check that the air conditioner is tilted about 3° to 4° (degrees) downward slope toward the outside. After proper installation, water from the coils should not drain from the unit during normal use. Correct the slope if necessary.

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5.2 Cleaning the Filter

In order to maintain energy efficiency and prolong the life of the unit the air filter should be checked at least once a month to see if cleaning is necessary. In addition, trapped particles in the filter can quickly build up and cause frost on the evaporator.

1. Open the front panel.

2. Take the filter by the center and pull up and out.

3. Wash the filter using liquid dishwashing detergent and warm water. Rinse filter thoroughly. Gently

shake excess water from the filter. Be sure the filter is thoroughly dry before replacing.

4. You may also gently use a vacuum to clean the filter.

5. Reinstall the air filter once it’s clean and dry.

Service Note:

1. Never use hot water over 104℉(40℃) to clean the air filter.

2. Never attempt to operate the unit without the air filter.

3. The air filter should be checked at least once a month to see if cleaning is necessary.

4. When the check filter light comes on clean the filter. It will be prolong the life of the unit and save

energy.

5. When the AC has not used for a for a prolonged period of time clean the filter before re-use.

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6 Modes and Operating Conditions

6.1 Terms and Definitions

1. TA: Temperature of indoor ambient.

2. TE: Temperature of evaporator.

3. TS: The set temperature.

4. DAHT: Heater sensor.

6.2 Protection Functions

 The compressor restart protection has a delay of 3 minutes.  5 minute operation for compressor in cooling mode.  Sensor protection against an open or short circuit.

6.3 Auto Mode

 AUTO Mode is a setting that allows the unit to automatically switch between COOL and FAN in order

to achieve and maintain the desired set temperature.

 In Auto mode the unit will choose cooling or fan-only mode based on ΔT(ΔT=TA-TS)

ΔT = TA - TS

Running mode

ΔT ＞ 4F

Cooling

-2F ≤ ΔT ≤ 4F

Fan-only

 The unit will default to running mode when in auto mode under the following circumstances:

1. Powering on, changing mode to auto mode or adjusting temperature in auto mode will cause the unit

to default to running mode again.

2. A: In auto mode, if the compressor does not run for 15 minutes check condition B.

3. B: If ΔT<-8℉ or ΔT ＞2℉, the unit will default to running mode again according to ΔT until the

compressor stops.

6.4 Fan-Only Mode

 If the temperature can’t be controlled by the selected mode and the room ambient temperature is

shown on the display the unit will default to fan only mode.

 The readout can only display a temperature of 32 to 99 ℉ (0 to 37℃.) lf the temperature is out of that

range the display will show LO or HI.

 The Timer function works in fan-only mode.  The follow me function (on some models) does not work in fan-only mode.

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6.5 Cooling Mode

 The cooling temperature can be set from 62 to 86℉ (17 to 30℃.)  Sleep, Timer and Energy Saver functions work in cooling mode.  The compressor will run when the difference between the set temperature and the actual ambient

room temperature conforms to the chart below:

1. When TA≤TS (for 1 minute) the compressor turns off.

2. When T1>TS+2℉ the compressor turns on.

6.6 Auto-Defrost Function

 The Auto-defrost function operates according to the chart below:

1. When TE is below 30℉ the evaporator will frost. As the unit defrosts the indoor fan will continue to

operate.

2. When the temperature is up over 55℉ the unit will stop defrosting.

(TA-Ts)℉

Operation conditon

compressor off with a delay of 1 minute

compressor on

TE ℉

compressor off

when TE is lower than 30℉

lasting for 5 seconds

compressor on

Page 20

6.7 Dry Mode

 In this mode, the air conditioner will operate as a dehumidifier. Because the conditioned space is

closed or sealed, some degree of cooling will continue to occur.

 The dry mode temperature can be set from 62 to 86℉ (17 to 30℃.)  The fan speed is Low and can’t be controlled.  Sleep function works in dry mode.

6.8 Sleep Mode

 This mode has a duration of 7 hours and can be used in Cool, Dry and Heat mode.  In sleep mode the fan speed will default to Auto.  In the first 60 minutes, the set temp will rise (or lower for heating mode) 2℉ (1℃) each half hour.

Then it will keep a steady temperature for 6 hours until the mode stops.

 If you change any settings after sleep mode starts, the function will stop. Press sleep button again or

use the remote control to start it again.

Page 21

7 Troubleshooting

7.1 Troubleshooting Guide

Problem

Possible Cause

Solution

Air conditioner does not function at all.

Wall plug is disconnected.

Insert plug firmly into proper wall outlet.

House fuse blown or circuit breaker tripped.

Replace fuse with time delay type or reset circuit breaker.

Power cord is tripped.

Press the RESET button on the power cord.

Unit is turned OFF.

Turn unit ON and set to desired setting.

Ribbon cable to control panel is disconnected.

Remove front grill and reconnect cable.

Loose or disconnected wiring on main PCB.

Remove front grill and outer shell. Check all connections to the PCB and reconnect any loose or disconnected leads.

Air from unit does not feel cold enough.

Room temperature is below 62℉ (17℃).

Cooling will not occur until room temperature rises above 62℉ (17℃).

Temperature sensor behind the front grill and air filter is touching the cold evaporator.

Realign sensor so it does not touch the evaporator coil. It should only be sensing the air temperature leaving the evaporator.

Set temperature is too high.

Set to a Lower temperature.

Compressor is shut-off by changing modes.

Wait approximately 3 minutes and listen for compressor to restart when set in COOL mode.

Air conditioner cooling, but room is too warm - ice forming on cooling coil behind front grill.

Outdoor temperature below 62℉ (17℃).

To defrost the coil, set to FAN ONLY mode.

Air filter may be dirty.

Clean filter. Refer to Installation and Cleaning section. To defrost, set to FAN ONLY mode.

Thermostat set too cold for night-time cooling.

To defrost the coil, set to FAN ONLY mode. Then set temperature to a Higher setting.

Air conditioner cooling, but room is too warm - NO ice forming on cooling coil behind front grill.

Dirty air filter- air restricted.

Clean air filter. Refer to Installation and Cleaning section.

Temperature is set too High.

Set to a Lower temperature.

The directional louvers on the front are positioned improperly.

Position louvers for better air distribution.

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Front of unit is blocked by drapes, blinds, furniture, etc. and is restricting air distribution.

Clear blockage in front of unit.

Doors, windows, registers, etc. are open and cold air is escaping.

Close doors, windows, registers.

Unit recently turned on in hot room.

Allow additional time for unit to remove stored heat from walls, ceiling, floor and furniture.

Air conditioner turns on and off frequently.

Dirty air filter- air restricted.

Clean air filter.

Outside temperature is extremely hot.

Set FAN speed to a Higher setting to push more air through the coils.

Noise when unit is cooling. Air movement sound.

This is normal. If too loud, set to a slower FAN setting.

Window vibration - poor installation.

Refer to installation instructions or check with installer.

Water dripping INSIDE when unit is cooling.

Improper installation.

Tilt air conditioner slightly downward toward the outside to allow water drainage. Refer to installation instructions - check with installer.

Water dripping OUTSIDE when unit is cooling.

Unit removing large quantity of moisture from humid room.

This is normal during very humid days. Room too cold

Set temperature is too low.

Increase the set temperature.

7.2 Error Codes and Sensor Malfunctions

 If display indicates an AS error, use the mode button to select "Fan" and LO or HI will be

displayed to indicate the underlying condition. See section 7.3 for additional information.

Display

Error

Solution

Room temperature sensor error.*

 Check sensor connection to main PCB and

secure any detached or loose connections.

 Check sensor wire for damage and repair if

possible.

 Test sensor (see table 7.3) Replace sensor if

defective.

Room sensor is an open circuit.*

Room sensor is a short circuit.*

●

Defrost sensor is open or short circuit.

Page 23

7.3 Temperature Sensor Resistance Test Table

Temp. ℃

Temp. ℉

Resistance KΩ

Temp. ℃

Temp. ℉

Resistance KΩ

Temp. ℃

Temp. ℉

Resistance KΩ

-10

62.2756

62.6

14.6181

111.2

4.3874

-9

15.8

58.7079

64.4

13.918

113

4.2126

-8

17.6

56.3694

66.2

13.2631

114.8

4.0459

-7

19.4

52.2438

12.6431

116.6

3.8867

-6

21.2

49.3161

69.8

12.0561

118.4

3.7348

-5

46.5725

71.6

11.5

120.2

3.5896

-4

24.8

73.4

10.9731

122

3.451

-3

26.6

41.5878

75.2

10.4736

123.8

3.3185

-2

28.4

39.8239

125.6

3.1918

-1

30.2

37.1988

78.8

9.5507

127.4

3.0707

35.2024

80.6

9.1245

129.2

2.959

33.8

33.3269

82.4

8.7198

131

2.8442

35.6

31.5635

84.2

8.3357

132.8

2.7382

37.4

29.9058

7.9708

134.6

2.6368

39.2

28.3459

87.8

7.6241

136.4

2.5397

26.8778

89.6

7.2946

138.2

2.4468

42.8

25.4954

91.4

6.9814

140

2.3577

44.6

24.1932

93.2

6.6835

141.8

2.2725

46.4

22.5662

6.4002

143.6

2.1907

48.2

21.8094

96.8

6.1306

145.4

2.1124

20.7184

98.6

5.8736

147.2

2.0373

51.8

19.6891

100.4

5.6296

149

1.9653

53.6

18.7177

102.2

5.3969

150.8

1.8963

55.4

17.8005

104

5.1752

152.6

1.83

57.2

16.9341

105.8

4.9639

154.4

1.7665

16.1156

107.6

4.7625

156.2

1.7055

60.8

15.3418

109.4

4.5705

158

1.6469

Page 24

EdgeStar, 8606 Wall St, Suite 1800, Austin, TX 78754

support.edgestar.com • service@edgestar.com • edgestar.com

*Warranty service should be performed by an authorized service representative only.

DATE

REVISION NOTES

04/11/2018

INITIAL DOCUMENT