iWorx® HPU3
16
505-035, Effective: June 30, 2015
© 2015 Taco Electronic Solutions, Inc.
Figure 6: Setpoint Adjustment
Heating Sequence
The reversing valve and compressor stages are sequenced based on the space temperature and the calculated heat-
ing setpoint. When the space temperature drops below the calculated heating setpoint, the reversing valve is cycled to
the heating position. When the space temperature drops below the calculated heating setpoint minus the heating con-
trol band for a predefined time period, a compressor stage is turned on. If the space temperature remains below the
heating control band for an additional time period, the next available stage is turned on. This cycle continues until all
available stages have been energized.
