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P/N 780100700 07/18 Rev F
For all climate modes, the FAVC incorporates a hysteresis algorithm program designed to limit ventilation
control based on the relationship between outdoor temperature and relative humidity level changes
within the home.
FIGURE 5: Suggested Climate Zone Setting Based on North America Region
HOT CLIMATE
COLD CLIMATE
NORMAL CLIMATE
FIGURE 6: Normal Climate Operation
In Climate Mode: NORMAL
The FAVC will provide fresh outside ventilation if the outside temperature is
between 100°F and 17°F depending on if the HVAC system is in heating or cooling mode and depending
on indoor relative humidity change during the ventilation cycle. Below 25°F outside temperature and in
heating mode, the ventilation is restricted to 25% depending on if indoor humidity is above or below 50%
RH. Above 90°F outside temperature and in cooling mode, the ventilation is restricted to 25% depending
on if indoor humidity is above or below 60% RH. Between 25-40°F outside temperature, ventilation
requires heating and if indoor humidity level is above 50% RH and RH continues to increase, then fresh
air ventilation is limited to prevent induct condensation from occurring.
3B. NORMAL CLIMATE ZONE
