iWorx® HPU3
12
502-035, Effective: February 21, 2012
© 2012 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).
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
Stat
• Precon Type III 10K thermistor, or
• 12 Volt nominal, internally limited to 0.04 A (SLink)
Supply Air Temp
• Precon Type III 10K thermistor
Heat Pump Power Transducer
• 0 to 10 Volts DC
Equipment Status, High Pressure Alarm, Low Pressure Alarm
• Dry Contact
• Normally Open
• 5 Volts DC Max
Outputs
Stage 1, Stage 2, Reversing Valve, Fan, and Dehumidification
• 24
Volts
AC
• 1A @ 50C, 0.5A @ 60C, limited by the Class 2 supply rating
Modulated Fan (analog output)
• 0-10 Volt
• 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
