gForce Ultra IOM
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Flooded systems are supplied with an optional liquid receiver and head pressure control valve. When
the ambient temperature falls during cold weather, the head pressure control valve will regulate the
flow of refrigerant to ensure minimum receiver pressure. The sub-cooling at times will fluctuate. The
condenser is partially flooded with liquid refrigerant in cold weather. In warm weather the extra
refrigerant is stored in the receiver. Therefore, flooded systems require more refrigerant than fan speed
control systems.
Low Ambient Receiver Package
The function of a Liquid Refrigerant Receiver is to store liquid refrigerant to provide continuous flow of
liquid refrigerant to the expansion device and to provide storage for the refrigerant charge during system
service or maintenance.
A receiver is required to store refrigerant during warmer weather. The receiver should be sized so it is
at 80 to 82% of capacity while containing the entire system charge. Another aspect of receivers is that
they contain both liquid and gaseous refrigerant at the same time. By their design, receivers prohibit
liquid subcooling from occurring. Without liquid subcooling the capacity of the system is reduced, and
care must be taken in the design of the liquid line to avoid flashing at the expansion valve.
Flooded systems are an excellent method of providing head pressure control in cold climates, but they
increase initial cost, add complexity to the refrigeration system, increase installation time, and increase
the refrigerant charge. The loss of subcooling should be recognized. If a flooded system is required,
consult the Data Aire prior to installation.
Applications
Liquid Refrigerant Receivers are installed in air conditioning and refrigeration systems. The receiver is
installed after the condenser in order to collect the condensed refrigerant to allow a continuous liquid
supply to the expansion device. Liquid receivers are also used to store the refrigerant charge while the
system is pumped down for service or maintenance.
Selection Guidelines
Receiver storage capacities are based on the liquid occupying no more than 90% of the internal volume
when the temperature of the refrigerant is 90°F (32°C) per ASHRAE Standard 15-78. Includes within
Data Aire’ Product Selector Guide, the low ambient receiver package has already sized and selected
for each Ultra model size.
Receiver Location
The low ambient receiver package can be ordered as a unit mounted system or as a shipped loose
system. If the low ambient receiver package is unit mounted system, the complete package will be
factory mounted and wired integral to the air-cooled condenser.
If the low ambient receiver package is shipped loose, it is the responsibility of the installing contractor
to mount the receiver package in a suitable location outdoors, near the air-cooled condenser, and to
connect the piping and electrical wiring, as requirement.
Safety Relief Devices
Data Aire’s low ambient receiver(s) include a suitable fusible plug safety relief device installed on the
receiver housing. The fusible plug is a onetime discharge device and must be replaced in the event of
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