Koldfront TWR327ESS Service Manual
EdgeStar, 8606 Wall St, Suite 1800, Austin, TX 78754
support.edgestar.com • service@edgestar.com • edgestar.com
Document Type: Service Manual
Version: V1.0 02052018
CONTENTS
CONTENTS................................................................................................................................................... 1
SAFETY PRECAUTIONS ............................................................................................................................. 1
ELECTRICAL SAFETY ............................................................................................................................. 2
GENERAL SAFETY .................................................................................................................................. 3
THERMOELECTRIC PRECAUTIONS .......................................................................................................... 4
FINDING A GOOD SPOT FOR YOUR WINE COOLER .............................................................................. 4
THERMOELECTRIC COOLING PRINCIPLES ............................................................................................. 5
EXPLODED VIEW DIAGRAM....................................................................................................................... 6
PARTS LIST .................................................................................................................................................. 7
CIRCUIT BOARD DIAGRAM ........................................................................................................................ 8
SPECIFICATIONS ........................................................................................................................................ 9
WIRING DIAGRAM ....................................................................................................................................... 9
POWER SUPPLY BOARD .......................................................................................................................... 10
REPLACING THE POWER SUPPLY BOARD ........................................................................................... 11
REPLACING THE TEMPERATURE CONTROL BOARD .......................................................................... 12
THERMOELECTRIC MODULE AND HEAT FAN ....................................................................................... 13
REPLACING THERMOELECTRIC MODULE AND HEAT FAN ................................................................. 14
REPLACING THE HEAT FAN .................................................................................................................... 15
REPLACING THE COOLING FAN ............................................................................................................. 15
REPLACING THE THERMOELECTRIC NODE ......................................................................................... 17
ERROR CODES ......................................................................................................................................... 18
DIAGNOSTICS: WINE COOLER DOES NOT COOL OR WILL NOT RUN. .............................................. 19
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.
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 (120V, 60Hz), 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 the door and cut off the power
cord.
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 the door so that children and pets will not be trapped in the unit.
Thermoelectric Precautions
This wine cooler uses thermoelectric technology rather than compression or absorption-types and there
are several issues that need attention:
Room temperature - The wine cooler needs to be located in a climate controlled room. The unit
will perform it’s best at a room temperature of approximately 72° to 77℉. It will not cool correctly
when the room temperature is higher than 90° or lower than 65°F.
Ventilation – The wine cooler needs to be free standing. It should not be recessed or built in (fully
recessed.) Allow enough clearance (5”) at the rear and sides of the wine cooler to allow proper
ventilation. Lack of proper ventilation will have a negative impact on the performance of cooler.
Moisture – The wine cooler may have some condensed water on the surface of the glass door if
opened constantly in a moist place. This moisture will drain into the condensate tray at the back
of the unit and may require emptying if excessive moisture is collected in a short period of time.
Finding a good spot for your wine cooler
Where you locate the wine cooler is critical to its performance. Follow these guidelines:
Install your wine cooler on a level surface that is strong enough to support it when fully loaded.
Allow 5 inches (15cm) of space at the rear and at both sides of the wine cooler to allow proper
ventilation.
This wine cooler is designed to be free standing only and should not be recessed or built-in (fully
recessed.)
Do not place heavy objects on top of the unit.
Do not install the unit outside or in a moist place.
Do not install the wine cooler in direct sunlight or next to heat sources.
The unit’s cooling system operates at maximum efficiently with an ambient room temperature of
72° to 77℉. The interior temperature can be set between 44°F and 66°F and will be most accurate
in that temperature range.
Thermoelectric Cooling Principles
Thermoelectric cooling, called the Peltier effect, is a solid-state method of cooling or heating by
passing current through two different (P shape & N shape) semiconductor materials.
The complete system includes a semi-conductor module (P&N shape semi-conductors clamped with
two ceramic chips), an internal and external heat exchanger. To obtain higher energy efficiency lowspeed-and-noise fans are fitted to the heat exchangers. During operation direct current goes through
the semiconductor module which causes heat to be transferred from one side to the other.
Exploded View Diagram
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