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RLC-PRC016-EN
Features and
Benefits
Trouble-Free Installation,
Start-Up and Operation
Adaptive Control
™
Microprocessor
The RTAA 70-125 chiller offers advanced
microprocessor control and features the
Adaptive Control microprocessor. So
what is the Adaptive Control
microprocessor? Adaptive Control
means the Unit Control Module (UCM)
directly senses the control variables that
govern operation of the chiller: motor
current draw, evaporator temperature,
condenser temperature, etc.
When any of the variables approaches a
limit condition where the unit may be
damaged or shut down on a safety, the
UCM takes corrective action to avoid
shutdown and keep the chiller operating.
It does this through combined actions of
compressor slide valve modulation,
electronic expansion valve modulation
and fan staging. Additionally, the UCM
optimizes total unit power consumption
during normal operating conditions. No
other chiller control system in the
marketplace duplicates this
performance.
The End Of Most Nuisance Trip-Outs
And Unnecessary Service Calls?
Unnecessary service calls and unhappy
tenants are reduced. Only when the
UCM has exhausted the corrective
actions it can take and the unit is still
violating an operating limit will the unit
shut down. CONTROLS ON OTHER
CHILLERS TYPICALLY SHUT DOWN THE
CHILLER, QUITE PROBABLY JUST
WHEN IT IS NEEDED THE MOST.
For example:
A typical five-year-old chiller with dirty
coils might trip-out on high pressure
cutout on a 100°F day in August. A hot
day is just when comfort cooling is
needed the most. In contrast, the air-
cooled Series R
™
chiller with an Adaptive
Control microprocessor will stage fans
on, modulate electronic expansion valve,
and modulate slide valve as it
approaches a high pressure cutout.
Thereby KEEPING THE CHILLER ON-
LINE JUST WHEN YOU NEED IT THE
MOST.