Taco Electronic Solutions iWorx MPU2, Installation Manual

Page: 20 / 28

iWorx® MPU2/MPU3
20 502-009, Effective: April 17, 2013
© 2013 Taco Electronic Solutions, Inc.
Adding Enthalpy Economizer
Controlled: 0-10VDC Modulated or 2-pos Economizer
Damper Actuator
Added Module Required: Add ASM Module to net-
work with OA Temp and Humidity Sensors
Added Sensors Required: Mixed Air Temp, Return
Air Humidity
Existing Sensors Required: Return Air Temp, Supply
Air Temp, Fan Proof, Filter Status
Setup Instructions
1.Press Controllers from main screen.
2.Select required MPU from controller list and press
appropriate controller.
3.Press All Settings .
4.Press Next 14 .
5.Press Economizer .
6.The Economizer menu opens.
a.Select Type of economizer control:
-2 st (2 position), Unocc ON
-2 st (2 position), Unocc OFF
-Mod (modulating), Unocc ON
-Mod (modulating), Unocc OFF
NOTE: Unocc ON/OFF specifies whether you
want the economizer enabled (ON) or dis-
abled(OFF) during the unoccupied time peri-
ods.
b.Select economizer setpoint , which specifies the
outside air temperature at which the economizer is
enabled.
c. Select Min Fresh Air % . The minimum required
damper position for ventilation specified.
d.Select Min AO (Output) Voltage (0-10VDC) for
damper actuator. 0.0VDC Shown as Example.
e.Select Max AO (Output) Voltage (0-10VDC) for
damper actuator. 10.0VDC shown as example. If a
reverse action damper is used then reverse the
min and max voltages.
f. Press Save .
g.Note: DO NOT change factory KP/KI settings.
Please review Factory KP/KI Setting White Paper #
508-001.
7.Press Free Cooling .
8.8.The Free Cooling menu opens.
a.Select Type of economizer control:
-Return Air Humidity (Enthalpy)
-Global Humidity (not used)
-Dry Bulb
b.Select Enthalpy Offset (Humidity Ratio) in BTU/lb
c. Select Dry Bulb Offset in degrees.
d.Press Save .
e.Note: Setting as per engineered documents. If spe-
cific settings are not known, leave at factory
defaults shown above.
9.Press Next 4 .