Figure 23. Auto 3/heat and 2/cool systems
General Notes:
• The third auxiliary-stage heat output is only used for 3H/2C heat pump systems.
• The algorithm of cycling control is the same as the first-stage output. However, it has independent cycle
period setting.
• Both the first and second stage use the same temperature differential around setpoint for cycling
control.
• When the system is set for 3H/2C HP, the cycles for auxiliary heat (Option Number 0164) is used for
the third auxiliary heat stage.
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