Amron 9000-ECS, Руководство пользователя

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MODEL 9000-ECS USER MANUAL
9000-ECS-UM REV 4.0
7
The resulting temperature drop causes the Freon gas to change from a gaseous state to a
liquid form.
The Freon liquid/gas from the output of the condenser is collected in the accumulator. The
accumulator buffers the pressure pulses from the compressor and provides a collection point
(reservoir) to draw off liquid Freon. The Freon then goes through a filter/drier to remove any
foreign particles, and ensure no particles reach the expansion valve. A sight gauge is
provided on the output of the filter/drier as a visual indication of the status of the system.
If you watch the sight glass during normal operation of the system you will see the Freon
flowing through the system. At normal room temperatures 70
o
F (21
o
C) you will see a small
amount of bubbles in the liquid. This is normal, if the operating temperature goes up the
amount of bubbles will increase and if the temperature goes down the amount of bubbles will
decrease to the point where there will be none.
The expansion valve controls the flow of liquid Freon into the evaporator, where the Freon
under a lower pressure expands and changes to a gas. This change from liquid to gas
absorbs heat providing the cooling desired. The expansion valve is controlled by a temp bulb
sensing the temperature on the output of the evaporator. If the temperature is high (or equal
to the temperature of the expansion valve) the valve opens allowing more Freon into the
evaporator. This continues until the temperature at the output of the evaporator drops, and
the valve throttles the flow of Freon.
The Freon circuit achieves a balanced condition when the spring force of the expansion
valve, refrigerant pressure/temperature, and evaporator pressure/temperature results in the
proper flow of Freon achieving the desired cooling. The design of the system determines
proper operation as opposed to adjustments. Expansion valves are adjustable; however, this
is set by the manufacture of the valves and is not a field procedure.
The evaporator is a two-circuit system and uses a Freon distributor to feed the two circuits of
the evaporator coil. The expansion valve, distributor, evaporator coil, and compressor
system are sized to achieve the desired end result. It is not recommended that part
substitutions be made. The Freon vapor returns to the compressor (suction side) completing
the refrigerant cycle.
FLUID SYSTEM 4.3
The fluid system might be considered the heart of the system. This is where heat is added
to, or subtracted from the system. The fluid, heated or cooled is then pumped to the
chamber inside conditioning unit. The chamber inside conditioning system consists of a set
of coils, where a fan blows air across the coils producing heat or cooling.
The fluid system consists of a reservoir, pump, temperature meters, and associated
plumbing. The reservoir contains a fluid that is heated or cooled, (depending on the mode
selected), which is then pumped to the chamber heat exchanger where heat is extracted or
added to achieve the desired end result.
Because of the low temperature range of the unit (20o F), it is necessary to extend the
operating range of the fluid by adding antifreeze to the water. Use either ethylene glycol or
propylene glycol, in the ratio of 50% glycol to 50% water. The reservoir holds approximately
7 gallons of fluid; therefore it will be necessary to add approximately 3.5 gallons of glycol.