Thx9321 Installation; Insert Coin Cell Battery In Thermostat; Thx9421 Installation; Insert Coin Cell Battery - Honeywell THX9321 Prestige 2.0 Product Data

4. Remove the wallplate from the wall and, if drywall, drill
two 3/16-in. holes in the wall, as marked. For firmer
material such as plaster, drill two 7/32-in. holes. Gently
tap anchors (provided) into the drilled holes until flush
with the wall.
5. Position the wallplate over the holes, pulling wires
through the wiring opening. See Fig. 18.
6. Insert the mounting screws into the holes and tighten.
Fig. 18. Mounting wallplate (THX9421).

Insert Coin Cell Battery in Thermostat

Place coin cell battery in thermostat. Be sure to follow polarity
markings on thermostat. See Fig. 19.
NOTE: Coin cell battery saves time and date during a
power loss.
1324
Fig. 19. Insert coin cell battery (THX9421)

THX9421 Installation

INSTALLATION WITH EQUIPMENT INTERFACE MODULE
(EIM)
1. Wire to C and R terminals of the EIM or to a separate 24
volt transformer (not provided). See Fig. 20.
2. Snap thermostat onto wallplate after wiring is complete.
R
C
MCR34688
®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
INSTALLATION WITH TRUEZONE WIRELESS ADAPTER
1. Wire to C and R terminals of the TrueZONE panel or to a
separate 24 volt transformer (not provided). See Fig. 20.
2. Snap thermostat onto wallplate after wiring is complete.

THX9321 Installation

THERMOSTAT WIRED DIRECTLY TO THE HVAC
EQUIPMENT OR ZONE PANEL
1. Refer to "THX9321 Thermostat Wiring Diagrams" begin-
ning on page 141.
2. Snap thermostat onto wallplate after wiring is complete.
INSTALLATION WITH EQUIPMENT INTERFACE MODULE
(EIM)
1. Connect power and common from the EIM to the Rc and
C terminals at the thermostat or use a separate 24 volt
transformer (not provided) to power the thermostat.
2. Snap thermostat onto wallplate after wiring is complete.
NOTE: Note: When the THX9321 thermostat is used with
an EIM, the relays in the thermostat do not func-
tion.
INSTALLATION WITH TRUEZONE WIRELESS ADAPTER
1. Connect power and common from the TrueZONE panel
to the Rc and C terminals at the thermostat or use a sep-
arate 24 volt transformer (not provided) to power the
thermostat.
2. Snap thermostat onto wallplate after wiring is complete.
NOTE: When the THX9321 thermostat is used with a
TrueZONE Wireless Adapter, the relays in the
thermostat do not function.
Fig. 20. Inserting wires in thermostat terminal screws
13
®
IAQ WITH EIM
(THX9421).
68-0311—02