SYSTEM OPERATION
20
Cooling
The refrigerant used in the system is R-410A. It is a clear,
colorless, non-toxic and non-irritating liquid. R-410A is
a 50:50 blend of R-32 and R-125. The boiling point at
atmospheric pressure is -62.9°F.
A few of the important principles that make the refrigeration
cycle possible are: heat always flows from a warmer to a
cooler body. Under lower pressure, a refrigerant will absorb
heat and vaporize at a low temperature. The vapors may
be drawn off and condensed at a higher pressure and
temperature to be used again.
The indoor evaporator coil functions to cool and dehumidify
the air conditioned spaces through the evaporative process
taking place within the coil tubes.
NOTE: The pressures and temperatures shown in the
refrigerant cycle illustrations on the following pages are
for demonstration purposes only. Actual temperatures
and pressures are to be obtained from the “Expanded
Performance Chart”.
Liquid refrigerant at condensing pressure and
temperatures, (270 psig and 122°F), leaves the outdoor
condensing coil through the drier and is metered into the
indoor coil through the metering device. As the cool, low
pressure, saturated refrigerant enters the tubes of the
indoor coil, a portion of the liquid immediately vaporizes.
It continues to soak up heat and vaporizes as it proceeds
through the coil, cooling the indoor coil down to about 48°F.
Heat is continually being transferred to the cool fins and
tubes of the indoor evaporator coil by the warm system air.
This warming process causes the refrigerant to boil. The
heat removed from the air is carried off by the vapor.
As the vapor passes through the last tubes of the coil, it
becomes superheated. That is, it absorbs more heat than
is necessary to vaporize it. This is assurance that only
dry gas will reach the compressor. Liquid reaching the
compressor can weaken or break compressor valves.
The compressor increases the pressure of the gas, thus
adding more heat, and discharges hot, high pressure
superheated gas into the outdoor condenser coil.
In the condenser coil, the hot refrigerant gas, being
warmer than the outdoor air, first loses its superheat by
heat transferred from the gas through the tubes and fins
of the coil. The refrigerant now becomes saturated, part
liquid, part vapor and then continues to give up heat until
it condenses to a liquid alone. Once the vapor is fully
liquefied, it continues to give up heat which subcools the
liquid, and it is ready to repeat the cycle.
Cooling Cycle
Summary of Contents for ASXC16
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