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41
On -- The system has a variable speed blower.
Factory default is OF (Off)
Option 42 — Variable Speed Super Dehumidification
This option will only be available if the Variable Speed Blower setup (Option
41) has been set to ON.
OF -- 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 OF (Off)
Option 43 — Intelligent Heat Staging
This function is only available if the equipment configuration is a single speed
heat pump (Option 01 = HP) and the thermostat is a Tx--PRH or Tx-- NRH
model. The Y1/W2 output, which energizes the second stages of heat, is only
populated on these models.
Off -- Electric heat will not be staged.
On --Three stages of electric heat will be staged.
This switch should be set to On if the HVAC equipment has two banks of strip
heaters. When electric heat is required, the thermostat will energize the smallest
bank first (W1 only), then the larger bank (turning the smaller bank off -- Y1/W2
only), and then both banks together (both W1 and Y1/W2). When power is
cycled to the thermostat, this unit configuration will be displayed as HS.
Factory defaults is OF (Of f)