Mylar Damper Assembly

A Mylar damper has been used in some metal liner SXS refrigerators since June 2007.

IMPORTANT SAFETY NOTICEThe information in this presentation is intended for use by individuals possessing adequate backgrounds of electrical, electronic, & mechanical experience. Any attempt to repair a major appliance may result in personal injury & property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

WARNINGTo avoid personal injury, disconnect power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks.

RECONNECT ALL GROUNDING DEVICESIf grounding wires, screws, straps, clips, nuts, or washers used to complete a path to ground are removed for service, they must be returned to their original position & properly fastened.

Copyright General Electric 2010

GE Factory Service Employees are required to use safety glasses with side shields, safety gloves & steel toe shoes for all repairs.

Dyneema Cut Resistant Glove

Safety Glasses must be

compliant with ANSI Z87.1-2003

Prescription Safety Glasses

Plano Safety GlassesSteel Toe Shoes

VR Gloves provide shock protection

Copyright General Electric 2010

Mylar Damper Identification

Open both doors, quickly close the freezer door. Listen for the slapping sound of the damper door closing.

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Damper Location

Damper Assembly

The Mylar damper is in the same location as the motorized damper assembly on other metal liner electronic refrigerators.

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The evaporator fan motor pulls air from the fresh food compartment through the fresh food return duct.

FF Return

Damper Operation

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Damper Door

This causes a negative pressure (suction) on the fresh food side of the damper door.

Negative pressurecreates suction here.

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At the same time, the evaporator fan motor pushes air into the top of the freezer.

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This causes a positive pressure on the freezer side of the damper door.

Damper DoorPositive pressurepushes here.

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The combination of positive and negative pressure causes the damper to open and air to circulate in the fresh food.

Damper Door

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The amount of air circulation is determined by fan speed.

Low Speed - 1250 RPM (Damper open about ) Medium Speed - 2000 RPM (Damper open wider) High Speed 2800 RPM (Damper open widest)

Fresh food warm and freezer warm, fan runs at medium speed.Fresh food satisfied and freezer warm, fan toggles between low and medium speed.Fresh food warm and freezer satisfied, fan runs at low speed.

Fan speed scenarios:

Fan Speed

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Look for packages blocking thefreezer return.(This causes increased suction on the fresh food side.)

The wrong main control boardinstalled on a previous call.

(This causes the fan to run too fast.)

Bad fresh food thermistor.

Low Refrigerant Charge(Freezer temp cannot get cold enough. During normal cycling,

the unit will toggle between low speed and medium speed after the fresh food is satisfied until the freezer is satisfied.)

The most common complaint is Fresh Food Too Cold

Troubleshooting

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There are 2 paths for evaporator return air to flow. Path #1 is through the freezer return.Path #2 is through the fresh food return.

How the Freezer Affects the Fresh Food

FF Return is behind the evaporator.

FZ ReturnAirflow

Fan Motor

Damper

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Restricting the freezer return causes the fan motor to draw harder on the fresh food return, creating additional suction in the fresh food section, pulling the damper too far open.

FF Return.

FZ ReturnEvaporator moved to show fresh food return.

Fan motor mounted here.

Damper

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The electrical connector (plug) used for the motorized damper is still located in the refrigerator liner. It is approved to use a motorized damper in place of a Mylar damper in cases involving high usage, when all other service checks have been performed. The electronic control board is capable of running either type of damper.

Motorized Damper WR09X10050

High Usage Conditions

Copyright General Electric 2010

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Models Currently Using The Mylar Damper

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Models Currently Using The Mylar Damper

Copyright General Electric 2010

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Models Currently Using The Mylar Damper