iWorx® HPU3
10
502-035, Effective: February 21, 2012
© 2012 Taco Electronic Solutions, Inc.
Figure 4: HPU3 Wiring Example - Power Isolated
Connecting Input Devices
Thermostat (STAT)
To connect the heat pump thermostat to the unit, attach one wire from the thermostat to STAT (T3) and the other wire to
the adjacent common (T4).
Equipment Status (EQS)
To connect the equipment switch to the digital input, attach one wire of the contact to EQS (T5) and the other wire to
the adjacent common (T6). This must be a dry contact, normally open switch which closes when flow is detected. If a
flow proof switch is not installed, the terminals should be connected with a jumper wire.
