Theory Of Operation; General; Refrigeration - Amron 9000-ECS User Manual

4.

THEORY OF OPERATION

4.1

GENERAL

The Model 9000-ECS is one part of a system designed to provide temperature and humidity
control of a decompression chamber. The complete system consist of an internal
conditioning system (the Amron Model 9100-ICS2), the external conditioning system (the
Amron Model 9000-ECS), and the associated plumbing.
Temperature control is provided by circulating heated/chilled water through a set of coils
inside the chamber (inside conditioning unit), where a fan blows chamber air across the coils
picking up the heat/chill of the circulating fluid.
The temperature of the chamber can be raised or lowered depending upon the temperature
of the circulating fluid. Circulating hot water will cause heated air to be exhausted from the
internal conditioning system. Cold water will cause the temperature of the air exhausted from
the internal conditioning system to be cooled. Temperature control is accomplished by
turning the internal conditioning system off upon reaching the desired temperature.
Humidity removal is accomplished by circulating cold water through the internal conditioning
system that causes moisture in the air to condense on the coils, lowering the humidity within
the chamber.
The Model 9000-ECS, External Conditioning System, consists of a fluid system
(reservoir/pump) to store and circulate the water, a refrigeration unit to cool the water, a
heater to heat the water, and controls to select the mode of operation.
Internal temperature controllers limit the temperature range of the circulating water to 20
(minimum) to 110
water until the system reaches 20
refrigeration system will shut down. The circulation pump will continue to operate, providing
chilled water. When the temperature of the reservoir raises approximately 5
refrigeration system will start automatically. The same control system is provided for the heat
cycle with the control point set at 110
Refer to block diagram or schematic (Section 10) while reading this section.
4.2

REFRIGERATION

The refrigeration system removes heat from the internal reservoir and exhausts the heat to
the ambient air circulating through the unit. The refrigeration system is a closed circuit R-
404A Freon vapor refrigeration system. The refrigeration system consist of the standard
refrigeration components; compressor, condenser, accumulator, filter/drier, sight glass,
expansion valve, and evaporator.
Freon gas is drawn into the suction side of the compressor at a low pressure, compressed to
a high pressure. The output of the compressor is connected to the condenser. The Freon
gas is cooled in the condenser, by a fan blowing ambient air over the coils of the condenser.
9000-ECS-UM
o
F (maximum). Within the capacity of the system, the unit will chill the
o
F, upon reaching a reservoir temperature of 20
o
F.
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MODEL 9000-ECS USER MANUAL
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