iWorx® MPU2
505-009, Effective: June 30, 2015
13
© 2015 Taco Electronic Solutions, Inc.
Power (PWR)
Connect one output wire from a 24 VAC power supply to PWR (T39) and the other output wire from the power supply to
the adjacent common terminal (T38). T38 must be connected to earth ground.
Ground (GND)
Terminal GND
(T40) must be connected to earth ground. Failure to properly ground this equipment will
result in improper operation. Improper grounding may also increase the risk of electrical shock, and may
increase the possibility of interference with radio and TV reception.
SPECIFICATIONS
Electrical
Inputs
• Cabling: twisted shielded pair, 18
AWG
recommended—500
feet max. (152
meters)
• Resolution: 10
bit
Mixed Air Low Limit, Filter Status, Smoke Detect, Local IAQ Alarm
• Dry Contact
• Normally Open
• 5 Volts DC Max
Fan Proof
• Dry Contact
• Normally Closed
Return Air Humidity, Static Pressure
• 0 - 10 Volts DC
Mixed Air Temperature, Supply Air Temperature, Return Air Temperature
• Precon Type III 10K thermistor
Outputs
Fan Start/Stop, Heating Stage 1, Heating Stage 2, Cooling Stage 1, Cooling Stage 2, Cooling Stage 3, Cool-
ing Stage 4, Digital Economizer
• 24
Volts
AC
• 1A @ 50C, 0.5A @ 60C, limited by the Class 2 supply rating
Modulated Economizer, Bypass Damper
• 0-10
Volts
DC
• 2K Ohm minimum load
• 8 bit resolution
Power
Power Requirements
• 24VAC (20VAC to 28VAC), requires an external Class 2 supply
Power Consumption
• 7.2W with no external loads, maximum limited by the Class 2 supply rating
