Honeywell AQ25A Series Technical Reference Booklet page 204

Minimum Floor Limit Temperature
This parameter is used only if the thermostat has been configured for
AF temperature control. If the floor temperature is below that limit, the
pump or valve will be activated regardless of the ambient tempera-
ture.
Maximum Floor Limit Temperature
This parameter is used only if the thermostat has been configured for
AF temperature control. If the floor temperature is above that limit,
the pump or valve will be deactivated regardless of the ambient tem-
perature.
11 69-2005EF