Staging Control - Honeywell TH8321 Product Data

VISIONPRO® 8000 SMART THERMOSTAT
Installer Options
Fig. 99.
Enter password
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Fig. 100.
Using the Temperature Display
In some circumstances, the temperature displayed on the
Home screen may not match the temperature near the
thermostat.
If your system is set up to use indoor sensors, it may be
reading a sensor in another location.
Temperature reading depends on location of sensor
Fig. 101.
U1 Contacts
The U1 contacts can be setup to control IAQ equipment or
a stage of heating or cooling in the Installer Setup. Setup
options are listed below.
33-00096—04
MCR33976
0 0 0
MCR33977
MCR33985
U1 Contacts
• Humidification (ISU 803)
• Dehumidification (ISU 904)
• Ventilation (ISU 1002)
• Cool Stage 3 (ISU 208)
• Conventional Heat Stage 3 (ISU 210, 214)
• Backup Heat Stage 2 for Heat Pumps (ISU 217)
• Geothermal Radiant Heat (ISU 203)
Sensor Input (S1, S1)
The S1 input can be setup to work with a sensor. See wiring
diagrams beginning on page 89. The thermostat has one
Sensor Input.
Sensor Option
Indoor Air Sensor (ISU 500)
• C7189U1005 (10K)
• C7772A1004 (20K)
• C7772A1012 (20K)
• TR21 (20K)
• TR21-A (10K)
Outdoor Air Sensor (ISU 500)
• C7089U1006 (10K)
Discharge Sensors (ISU 500)
• C7735A1000 (10k)
• C7770A1006 (20K)
• C7041 (20K)

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%.
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 of cooling 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%.
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