Staging Control - Honeywell Prestige 2.0 THX9421 Manual

Installer
setup screen
Fig. 192.
8. Repeat steps 4–5 for the other Dry Contact, if neces-
sary.
Dry Contact Humidifier Lockout
This feature will automatically turn off the humidifier if full
drain pan or water leak dry contacts are tripped. Installers
can configure this setting in option 8095 of installer
setup.
Fig. 193.

Staging Control

Differential Between All Stages
The thermostat provides Differential settings between all
stages. The equipment changes stages based on how far
the indoor temperature is from the setpoint. Differential
settings provide a way to balance comfort and
conservation.
Heat Differential
The indoor temperature must drop to the selected
differential setting before the thermostat will turn on the
stage of heating. For example, if stage 2 is set to 2 °F (1.0
°C), the indoor temperature must be 2 °F (1.0 °C) away
from the setpoint before stage 2 turns on. When set to
Comfort, the thermostat will use the stage of heating as
needed to keep the indoor temperature within 1 °F (0.5 °C)
degree of the setpoint. The thermostat turns on stage 2
when the capacity on stage 1 reaches 90%.
User notification screen
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THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
Cool Differential
The indoor temperature must rise to the selected
differential setting before the thermostat turns on the
stage of cooling. For example, if stage 2 is set to 2 °F (1.0
°C), the indoor temperature must be 2 °F (1.0 °C) away
from the setpoint before stage 2 turns on. When set to
Comfort, the thermostat uses the stage cooling as needed
to keep the indoor temperature within 1 °F (0.5 °C) degree
of the setpoint. The thermostat turns on stage 2 (or the
next stage) when the capacity on stage 1 reaches 90%.
TO CHANGE DIFFERENTIAL SETTINGS
1. Select Advanced Options to view/adjust differentials
between all stages.
2. Default is Comfort. Adjust differentials as needed.
Backup Heat Differential (Droop)
A Backup Heat Differential is available for any system with
2 heating types. For example:
• Heat Pumps with any type of Backup Heat
• Radiant Heat with any type of Backup Heat
• Hot Water Fan Coil with any type of Backup Heat
The Backup Heat Differential restricts backup heat during
the following conditions:
• Normal Operation
• Manual Setpoint Changes
The options are:
• Comfort – keeps temperature within 1 degree of the
setpoint.
• 2 to 15 °F – Backup heat is not used unless the indoor
temperature drops to the selected Backup Heat
Differential. For example, if the Backup Heat
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IAQ WITH EIM
Fig. 194.
Fig. 195.
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