iWorx® MPU2
505-009, Effective: June 30, 2015
3
© 2015 Taco Electronic Solutions, Inc.
MPU2
The MPU2 is a self-contained microprocessor-based controller for multiplexed zone package units. Applications
include packaged rooftop DX units with up to four stages of cooling, or a floating point control valve, or a modulated
output (valve or variable speed circulator) two stages of heating, or a floating point control valve, or a modulated output
(valve or variable speed circulator) economizer, and bypass damper.
Overview
Digital inputs are provided for fan status, mixed air low limit indication, smoke detector, filter status and indoor air qual-
ity (IAQ). Analog inputs are provided for mixed air temperature, return air humidity, supply air temperature, and supply
duct static pressure. The MPU2 incorporates digital outputs in the form of triacs for fan start/stop, four cooling stages,
two heating stages, and a two-position economizer. In addition, four analog outputs are provided to control cooling and
heating outputs, a modulated economizer, and bypass damper.
The MPU2 is based on the L
ON
W
ORKS
®
networking technology. The controller can be networked to a higher-level con-
trol system for monitoring and control applications.
Features
• Four stages of cooling, or a floating point control valve, or a modulated output (valve or variable speed circulator)
• Two stages of heating, or a floating point control valve, or a modulated output (valve or variable speed circulator)
• Modulated bypass damper
• Digital or modulated economizer
• Economizer enabled based on enthalpy calculations or dry bulb
• Minimum cycle timers for stages
• Runtime accumulation for heating, cooling, and fan
• Dehumidification
• Multiplexed control of 32 zones based on zone demand
• Supply air temperature safety limits
• Supply air temperature setpoint reset based on greatest zone demand
• Time proportioned control of the staged outputs to reduce cycling
• PropoIntegral control of the modulated economizer, modulated heating modulated cooling and static pres-
sure
• Local backup schedule
• Mixed air low limit protection
• Filter status, fan proof, freeze stat and smoke detection inputs
• Fan control energized on a call for heating, cooling or ventilation
• Automatic Heat/Cool changeover
• IAQ compensation based on the IAQ input or zone controller alarm
• Outside Air Temperature cutoffs
• Real Time Clock
• L
ON
W
ORKS
®
interface to building automation systems
• Automatic configuration with the LCI
• Alarm/Event reporting
PURPOSE OF THIS GUIDE
The
iWorx® MPU2 Application Guide
provides application information for the MPU2 Controller.
