Installation Manual

25
This selection controls whether humidification can only be done when a heating demand is
present. If the homeowner turns humidification OFF, this configuration operates as if the
selection was set to OFF.
OFF – The humidity output will only energize when there is a humidity demand and the heating
equipment is energized.
On – The humidity output and the fan will energize anytime humidification is needed during
heating mode regardless of the state of the heating equipment.
Factory default is OFF
SW41 —Variable Speed Blower
This selection allows the installer to select between a single speed or variable motor. In a system
with a two speed compressor (A2, h2, H2), if a dehumidification demand exists and the
compressor is energized for cool to dehumidify, cooling, or both, and the system has a PSC
blower (SW41 = OFF), then both Y/Y2 and Y1/W2 are energized.
OFF – The system has a single speed (PSC) blower.
On – The system has a variable speed blower.
Select OFF for geothermal applications.
Factory default is OFF
SW42 —Variable Speed Super Dehumidification
This option will only be available if the Variable Speed Blower setup (SW41)
has been set to ON.
OFF – The fan output (G) is energized when the compressor is on for cool to dehumidify
functionality.
On – The fan output (G) is de-energized when the compressor is running for cool to dehumidify
functionality. In this setup the fan will run at very low speed because a Y/Y2 or Y1/W2 is
present but the G signal is not. The fan output (G) will be energized any time the compressor is
energized in response to a cooling demand.
Factory default is OFF
SW43 —Intelligent Heat Staging
This function is only available if the equipment configuration is a single speed heat pump (SW01
= HP).
OFF – Electric heat will not be staged.