THX9321 & THX9421 Product Data

THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ WITH EIM
97 68-0311—02
1. Wire the dry contact device to S1, S2, S3, or S4 termi-
nals at the EIM.
2. Enter Installer Setup (see “Installer Options” beginning
on page 21).
3. Dry Contacts are selected at ISU 6000. Select the appro-
priate Dry Contact(s) and press Next.
Fig. 187.
4. Select the terminals wired to the Dry Contact device, and
press Next.
Fig. 188.
5. Select Normally Open or Normally Closed, and press
Next.
NOTE: For example, if a wet switch is normally open, it
will close when the device detects water. If the
wet switch is normally closed, it will open when
the device detects water.
Refer to the instructions packed with the dry
contact device to determine if it is normally
open or normally closed.
Fig. 189.
6. If you are creating a custom alert, type the alert name
into the text box and press Done. The alert name is what
appears on the Home screen when the alert is detected.
See Fig. 190. You can edit or confirm the alert name
after you enter it.
Fig. 190.
7. Type the custom alert message into the text box and
press Done. The custom alert message appears when
the orange alert button is pressed. See Fig. 191. You can
edit or confirm the alert message after you enter it.
Fig. 191.
8. Repeat steps 4–5 for the other Dry Contact, if necessary.
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%.
Home screen
Installer setup
screen
User notification screen
Installer setup
screen