Installation Guide

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Seƫ ng the System Mode
Figure 20 Setting the System Mode
System Modes
• Off: System is off . No hea ng or cooling will come on. If system was on, it will turn off
immediately.
• Heat: Only hea ng will occur.
• Cool: Only cooling will occur.
• Auto: Hea ng or cooling will come on according to the hea ng and cooling setpoints. The
system will automa cally switch between hea ng and cooling modes as needed to maintain the
setpoints.
Special Heat Pump Mode: Emergency Heat
An addi onal system mode, “Heat-E” for Emergency Heat will be displayed if the HVAC System Type
is set to Heat Pump. If there is a compressor failure with the Heat Pump system, se ng the mode
to Emergency Heat will allow the supplemental Aux Heat to come on fi rst whenever there is a call
for hea ng. It also disables the compressor output to prevent further damage to the HVAC system.
CAUTION! Emergency Heat should only be used for emergencies un l the HVAC system can be
repaired. Running the system in Emergency Heat mode is commonly the most expensive mode since
only the electric heat strips are being used instead of the more effi cient heat pump compressor.
MODE
FAN
74
Off
Auto
PRESS MODE
BUTTON TO
CHANGE SYSTEM
MODE