Installation Guide
34 18-HD72D1-6
System Mode
The 824 has (5) System Modes which can be selected…
Heating, Cooling, Off, Emergency Heat and Auto.
• Heating – System will only operate in heating mode
• Cooling – System will only operate in the cooling
mode
• Off – System will not operate in heating or cooling
mode
• Emergency Heating – System will operate the indoor
heat source only (this is only available when the
outdoor unit type is a heat pump)
• Auto - The Control will determine which mode of
operation based on the following rules:
• Heating - Indoor temperature is equal or less than
heating setpoint
• Cooling – Indoor temperature is equal to or greater
than cooling setpoint or within 1°F of cooling setpoint
There is minimum deadband between heating and cooling
setpoints of 3°F
6.8 Fan Mode
The 824 has three Fan Modes:
• Auto – Fan only runs with a call for heating or cooling
• On – Fan runs continuous
• Circ – Fan runs a user selected minimum amount of
time each hour
6.9 Air Cleaner Mode
The 824 has three Air Cleaner modes:
• Auto – Air cleaner operates only with a call for fan
operation
• Quick – Air cleaner will operate for 3-hours
• Allergy – Air cleaner will operate for 24-hours
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