Defy Upright Refrigerator Service Manual download pdf (Page 13)

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We will now take a closer look at how the

cooling unit functions in normal operation.

When proper heat is supplied to the boiler,

ammonia vapor is produced and rises in the

siphon pump, carrying with it a weak liquid

ammonia solution. As seen from this drawing,

the siphon pump, or pump tube, is an internal

arrangement within the boiler section. The boiler

section utilizes the ammonia-water liquid solu-

tion in the absorber and as it is heated, turns

the solution into a strong ammonia vapor, which

is needed to operate the system. This strong

ammonia vapor rises from the pump tube to the

condenser coil.

Any deviation from the listed amount of

heat to the absorption system will alter the

ammonia to water ratio, which, in turn, will

decrease the cooling unit’s overall efficiency.

The weak ammonia solution which remains

behind is diverted to the top of the absorber

coils to perform a function that we will discuss

in further detail later in the program.

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The air that passes through the condenser fins,

from the venting system, removes heat from the

ammonia vapor, causing it to condense into a

strong liquid ammonia solution. As a liquid, it

then flows to the low temperature evaporator, or

freezer companment, where it comes into

contact with a hydrogen atmosphere. When this

occurs, the ammonia begins to evaporate which

draws heat from inside the freezer section, to

the rear of the cooling unit.

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This heat is then dissipated out through the

upper vent, which allows the refrigerators

interior temperature to properly maintain food

storage requirements. Not all of the liquid

ammonia evaporates in the freezer. What is left

continues to evaporate as it flows to the high

temperature evaporator, or food storage com-

partment.

c---_-------____---------__----_-__-7

I

I

I

WATER

1

i

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ENSER

PUMP

/

P

I

COLD INTERIOR

D-6-5

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Chilombela Terry 12 Mar 2024 | 22:29:54

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