iWorX CCU1
505-022, Effective: September 23, 2010
3
© 2010 Taco Electronic Solutions, Inc.
CCU1
The iWorX CCU1 chiller controller is a stand-alone microprocessor based controller for supervisory central chiller con-
trol applications that utilize one air-cooled chiller or a water-cooled centrifugal chiller with cooling tower.
Overview
Analog inputs are provided for chiller water supply temperature, chiller water return temperature, condenser water sup-
ply temperature, and condenser water return temperature. Digital inputs are provided for chiller pump flow proof, con-
denser pump flow proof, a cooling water demand proof, and a chiller general alarm.
The CCU1 incorporates digital outputs in the form of triacs for chiller low limit status and the start and stop of the chiller
and condenser pumps. In addition, three analog outputs are provided to control a modulated bypass valve, a variable
speed fan, and set the adjustable setpoint of the chiller.
The controller is based on the L
ON
W
ORKS
®
networking technology. The controller can be networked to a higher-level
control system for monitoring and control applications, and provides chilled water in response to demand from other
controllers.
Features
• Adjustable chiller setpoint
• Modulated cooling tower bypass valve
• Modulated cooling tower fan
• Minimum cycle timers for chiller On and Off
• Runtime accumulation for chiller, pumps, and fan
• Lead/Lag operation of water pumps
• Maximum of 60 cooling zones
• Propor Integral (P+I) control of the modulated bypass valve
• Propor Integral (P+I) control of a variable speed fan
• OAT low limit protection
• Flow proof inputs
• Chiller enable/demand input
• Chiller alarm input
• Automatic configuration with the LCI
• Alarm/Event reporting
PURPOSE OF THIS GUIDE
The
iWorX CCU1 Application Guide
provides application information for the CCU1 Controller.
The reader should understand basic HVAC concepts, intelligent environmental control automation, and basic L
ON
-
W
ORKS
networking and communications. This Application Manual is written for:
• Users who engineer control logic
• Users who set up hardware configuration
• Users who change hardware or control logic
• Technicians and field engineers
REPRESENTATIONS AND WARRANTIES
This Document is subject to change from time to time at the sole discretion of Taco Electronic Solutions, Inc. All
updates to the Document are available at www.taco-hvac.com. When installing this product, it is the reader’s responsi-
bility to ensure that the latest version of the Document is being used.
