Mr.Noppakorn Rumrattana INC2A 53211808

On Thursday, January 5th 2011.I assigned to cleaning and testing the electrical products from factory

that cause by flood and I choose to repair refrigerator.

The first step I do is learning about how does refrigerator works.

The left-hand picture shows what's happening on the inside back wall of the chiller cabinet. The

right-hand picture shows what's going around the back of the fridge on the outside.

1. The coolant is a liquid as it enters the expansion valve. As

it passes through, the sudden drop in pressure makes it

expand, cool, and turn into a gas (just like a liquid aerosol

turns into a cool gas when you spray it out of a can).

2. As the coolant flows around the chiller cabinet (usually

around a pipe buried in the back wall), it absorbs and

removes heat from the food inside.

3. The compressor squeezes the coolant, raising its

temperature and pressure. It's now a hot, high-pressure gas.

4. The coolant flows through thin pipes on the back of the

fridge, giving out its heat and cooling back into a liquid as

it does so.

5. The coolant flows back into the expansion valve and the

cycle repeats itself. So heat is constantly picked up from inside the refrigerator and put

down again outside it.

The second step was separated devices from refrigerator .

But I found a problem I could separated some part of refrigerator only because, it had permanent fix

and the only things I can do all that day was cleaning and learning how refrigerators works.