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Overview
Figure 5.
Alternate water source
If the return air temperature rises to the compressor cut-in
setpoint or if the AWS control valve reaches 100% open for
240 seconds (default compressor-on time delay), the
compressor turns on and operates in parallel with AWS
cooling. The compressor runs until the normal
compressor cut-out setpoint temperature is reached
provided the minimum run time expires.
o
If the chilled water inlet temperature rises above 55
F, AWS
cooling turns off (the control valve closes). When the DX
cooling stage-enable temperature setpoint is reached, the
compressor turns on and becomes the primary source of
cooling.
In the event of loss of water flow during AWS operation,
the AWS control valve is closed and the compressor
system becomes the primary cooling source. It will
activate if the return air temperature increases above the
setpoint.
AH-SVX008C-EN
11
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