Understand the Heating Fan Delay FunctionUpdated 3 days ago
This article explains the heating fan delay function for Vertex Ducted Central Split (DYC-18) systems.
This function adds a 90-second delay for the fan each time it starts up. This function activates when the SW1-2 DIP switch is set to "On" and the indoor unit is in Heating mode.
The Y1/Y2 signal from the thermostat determines the fan speed when this function is activated.