www.DaikinApplied.com 99 IOM 1322 • WATER-COOLED SCROLL COMPRESSOR
Model AC chillers equipped with air-cooled or evaporative-cooled condensers usually require some form of discharge pressure
control. The MicroTech II controller can be programmed to provide this function by cycling condenser fans based on the unit
discharge pressure. Directions on the pressure settings can be found on page 65. The following charts illustrate how four controller
outputs can control six fan steps.
ICE
In ICE mode, the compressors stage to 100% load until the LWT is less than the ICE LWT SP. Then Compressors #3 and #4
shut down. Following that, Compressors #1 and #2 shut down after going through normal pumpdown on both circuits. There is
a programmable, start-to-start, Ice Mode Start Delay that limits the frequency of starts when in the ice mode. The timer can be
manually cleared to force a restart.
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