Edgestar Koldfront Window Air Conditioner Service Manual

Koldfront Window Air Conditioner with Supplemental Heat Function

Models: WAC8001W, WAC12001W, WAC18001W, WAC25001W

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

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

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.

! WARNING

Electrical Shock Hazard

Connect to a grounded 3 prong outlet with an individual 12 amp branch circuit protected by a 12 amp circuit breaker. Connect to individual branch circuit. Do not remove ground prong. Do not use an adapter. Do not use an extension cord. Failure to follow these instructions can result in electrical shock, fire, or death.

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.

1 Exploded Diagrams and Part Lists

1.1 WAC8001W and WAC12001W

A diagram showing the exploded view of parts for WAC8001W and WAC12001W models.

1.2 WAC18001W

A diagram showing the exploded view of parts for the WAC18001W model.

1.3 WAC25001W

A diagram showing the exploded view of parts for the WAC25001W model.

1.4 Dimensions

A diagram illustrating the dimensions of the window air conditioner, with labels for Width (W), Height (H), and Depth (D).

2 Wiring Diagrams

2.1 WAC8001W

A wiring diagram for the WAC8001W model, showing connections between the main board, sensors, transformer, fan motor, compressor, and heater board.

2.2 WAC12001W and WAC18001W

A wiring diagram for the WAC12001W and WAC18001W models, illustrating the electrical connections.

2.3 WAC25001W

A wiring diagram for the WAC25001W model, detailing the electrical component connections.

3 Main Components

3.1 Major Parts

Images and labels of the major components of the air conditioner, including the electronic control box, capillary assembly, compressor, fan motor, and various barrier boards.

3.2 Electronic Control Box and Main PCB

An image of the electronic control box and main PCB, with labels for fan capacitor, compressor capacitor, sensor connections, display connection, transformer, and relay.

3.3 Sensor and Display Connections on Main PCB

A close-up image of the main PCB, highlighting the display connection, heater sensor, room temperature sensor, and defrost sensor connections. It notes that all sensor connections are clearly marked on the PCB.

4 Operating Instructions

4.1 Display Panel Controls

An illustration of the air conditioner's control panel and remote control, with labels for various buttons and functions:

• On/Off Button: Select to turn the unit off and on.
• Energy Saver: Automatically turns on in Cool, Dry, and Auto mode.
• Timer Button: Initiates Auto Start/Stop program.
• Mode Button: Selects operation mode (Auto, Cool, Dry, Fan).
• Check Filter: Reminder to clean the air filter.
• Fan Speed: Selects fan speed (Auto, Low, Medium, High).
• Sleep Button: Activates Sleep mode (available on Cool and Auto modes).
• Temp/Timer Up Button: Increases temperature setting.
• Temp/Timer Down Button: Decreases temperature setting.
• ONE TOUCH Button: Shifts to COOL operation with auto fan speed.

Up and Down Button: Press or hold to adjust temperature. Pressing both for 3 seconds toggles between °F and °C.

Mode Select Button: Cycles through modes: Auto, Cool, Heat, Dry, Fan. The indicator light illuminates for the selected mode.

Fan Speed Button: Cycles through fan speeds: Auto, Low, Medium, High.

Timer Button: Press to activate Auto Start/Stop. Adjust time in ½ hour or 1 hour increments. Setting to 0.0 cancels the program.

Sleep Button: Increases/decreases temperature by 2°F (1°C) every 30 minutes for 6 hours, then returns to the original setting. Can be cancelled by pressing the Sleep button again.

Energy Saver Button: Fan runs for 3 minutes after compressor shuts off, then cycles on for 2 minutes every 10 minutes until set temperature is reached.

Check Filter Button: Illuminates after 250 hours of operation as a reminder to clean the filter. Press to reset.

4.2 Remote Controls

A diagram of the remote control with detailed descriptions of each button's function:

• ON/OFF button: Turns the unit on and off.
• TEMP DOWN button: Decreases temperature in 1°C/1°F increments to 17°C/62°F.
• TIMER button: Activates the "Auto Start" or "Auto Stop" program.
• ONE TOUCH button: Automatically shifts to COOL operation with auto fan speed at 26°C/80°F.
• MODE Button: Selects operation mode from AUTO, COOL, DRY, and FAN.
• TEMP UP button: Increases temperature in 1°C/1°F increments to 30°C/86°F.
• FAN SPEED button: Selects fan speed in four steps: AUTO, LOW, MED, and HIGH.
• SLEEP button: Activates Sleep mode (available on COOL and AUTO mode only).

Additional notes:

• The remote signal receiver/sensor is on the control panel.
• Signal reception is confirmed by an audible beep.
• Direct sunlight can interfere with the infrared signal.
• To replace batteries, slide off the battery cover.

5 Installation and Cleaning

5.1 Proper Installation and Drainage

Older Koldfront window air conditioners used a drain plug. Current models do not. The fan disperses water over the condenser coils, aiding cooling and efficiency. Excess water drains from the lower back edge of the unit. Proper installation requires a slight rearward slope.

A diagram shows how to measure from the cabinet edge to ensure the correct slope (H). For models 8001 & 12001, H is 1/4" to 1". For models 18001 & 25001, H is 1/2" to 1".

Service Note: Ensure the air conditioner is tilted 3° to 4° downward toward the outside. Water should not drain during normal use. Correct the slope if necessary.

5.2 Cleaning the Filter

The air filter should be checked monthly for cleaning to maintain energy efficiency and prolong unit life. Dirty filters can cause frost buildup on the evaporator.

Steps for cleaning:

• Open the front panel.
• Pull the filter out by the center.
• Wash with mild dishwashing detergent and warm water. Rinse thoroughly and shake off excess water. Ensure the filter is completely dry before reinstalling.
• A vacuum can also be used for cleaning.
• Reinstall the clean and dry filter.

Service Note:

• Do not use hot water over 104°F (40°C) to clean the filter.
• Never operate the unit without the air filter.
• Check the filter at least once a month.
• Clean the filter when the "Check Filter" light illuminates to prolong unit life and save energy.
• Clean the filter before re-use after a prolonged period of non-use.

6 Modes and Operating Conditions

6.1 Terms and Definitions

• TA: Temperature of indoor ambient.
• TE: Temperature of evaporator.
• TS: The set temperature.
• DAHT: Heater sensor.

6.2 Protection Functions

• Compressor restart protection has a 3-minute delay.
• 5-minute operation for compressor in cooling mode.
• Sensor protection against open or short circuits.

6.3 Auto Mode

AUTO Mode automatically switches between COOL, FAN, and HEAT to maintain the set temperature. The mode is chosen based on ΔT (TA - TS):

The unit defaults to a running mode under these circumstances:

• Powering on, changing to auto mode, or adjusting temperature in auto mode.
• In auto mode, if the compressor does not run for 15 minutes, check condition B.
• If ΔT<-8°F or ΔT >2°F, the unit defaults to running mode again according to ΔT until the compressor stops.

6.4 Fan-Only Mode

• If the room ambient temperature cannot be controlled, the unit defaults to fan-only mode.
• The display shows temperatures from 32°F to 99°F (0°C to 37°C). Outside this range, it shows 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.

6.5 Cooling Mode

• Cooling temperature can be set from 62°F to 86°F (17°C to 30°C).
• Sleep, Timer, and Energy Saver functions work in cooling mode.
• The compressor runs when the difference between the set temperature and ambient room temperature meets the chart's conditions.

A chart illustrates compressor operation based on (TA-TS) °F: compressor on at +2°F, compressor off with a 1-minute delay at 0°F, and compressor on at -2°F.

• When TA ≤ TS (for 1 minute), the compressor turns off.
• When T1 > TS + 2°F, the compressor turns on.

6.6 Auto-Defrost Function

The Auto-defrost function operates based on evaporator temperature (TE):

A chart shows compressor on when TE is above 55°F, and compressor off when TE is below 30°F (lasting for 5 seconds).

• When TE is below 30°F, the evaporator may frost. The indoor fan continues to operate during defrost.
• Defrosting stops when the temperature rises above 55°F.

6.7 Heating Mode

• Heating temperature can be set from 62°F to 86°F (17°C to 30°C).
• Fan speed (Low/Med/High/Auto) can be chosen, unless it's a 115V heater model, which operates at Low speed by default and cannot be controlled.
• Sleep and Timer functions work normally in heating mode.

Heating operation is based on the difference between TS and TA:

A chart illustrates heating operation: Heater (compressor) off at >2°F, and Heater (compressor) on at ≤-2°F.

Service Note: The heat function provides supplemental heating. It has a lower BTU rating than cooling and does not treat the same square footage. Maximum heating capacity is 15°F above ambient room temperature.

6.8 Dry Mode

• The air conditioner operates as a dehumidifier. Some cooling occurs as the space is closed or sealed.
• Dry mode temperature can be set from 62°F to 86°F (17°C to 30°C).
• Fan speed is Low and cannot be controlled.
• Sleep function works in dry mode.

6.9 Sleep Mode

• This mode lasts for 7 hours and can be used in Cool, Dry, and Heat modes.
• In sleep mode, the fan speed defaults to Auto.
• For the first 60 minutes, the set temperature rises (or lowers for heating) by 2°F (1°C) every half hour.
• It then maintains a steady temperature for 6 hours until the mode stops.
• Changing any settings after sleep mode starts will stop the function. Press the sleep button again or use the remote to restart.

A graph shows temperature changes over time in Sleep Mode: ON at 0 hours, +2°F/1°C at 0.5 hours, +2°F/1°C at 1 hour, steady for 6 hours, and OFF at 7 hours.

7 Troubleshooting

Problems are classified into three types: Starting Failure (electrical defect), Air Conditioning failure (refrigeration system or air circulation defect), and Structural Damage.

7.1 Troubleshooting Guide

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.

7.3 Temperature Sensor Resistance Test Table

A table provides temperature (°C and °F) and corresponding resistance (kΩ) values for temperature sensors, used for testing and diagnostics.