iWorx® HPU2
2
502-025, Effective: April 12, 2011
© 2011 Taco Electronic Solutions, Inc.
HPU2
The HPU2 heat pump controller is a stand-alone microprocessor-based controller for liquid source heat pump units.
The application includes liquid source heat pump units with two-stage compressor, reversing valve and fan.
Overview
A digital input is provided to monitor equipment status. A two-wire serial interface is provided for the thermostat. The
HPU2 incorporates digital outputs in the form of triacs for fan start/stop, two compressor stages, and a reversing valve.
The controller is based on L
ON
W
ORKS
®
networking technology. The controller can be networked to a higher-level control
system for monitoring and control applications.
Features
• Two stage compressor heating/cooling control
• Reversing valve control
• Local backup schedule
• Individual temperature setpoints for occupied/unoccupied heat and cool
• L
ON
W
ORKS
interface to building automation systems
• Equipment status input for additional safety interlocks
• Thermostat with space temperature, setpoint adjust, fan override, occupancy override
• Fan control energized on call for heating or cooling
• Automatic heat/cool changeover
• Global unit enable for main plant synchronization
• Remote sensor capabilities
• Automatic configuration with the LCI
• Real Time Clock
• Alarm/Event reporting
PURPOSE OF THIS GUIDE
The
iWorx® HPU2 Installation Guide
provides installation information for the HPU2 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.
iWorx® products shall only be used for the applications identified in the product specifications and for no other pur-
poses. For example, iWorx® products are not intended for use to support fire suppression systems, life support sys-
tems, critical care applications, commercial aviation, nuclear facilities or any other applications where product failure
could lead to injury to person, loss of life, or catastrophic property damage and should not be used for such purposes.
