Honeywell Home THX9321 Prestige 2.0 Manual page 13

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.
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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 com-
plete.
R
C
MCR34688
CR2032
+
UP
MCR38035
®
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 com-
plete.
THX9321 Installation
THERMOSTAT WIRED DIRECTLY TO THE HVAC
EQUIPMENT OR ZONE PANEL
1. Refer to "THX9321 Thermostat Wiring Diagrams"
beginning on page 140.
2. Snap thermostat onto wallplate after wiring is com-
plete.
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 ther-
mostat.
2. Snap thermostat onto wallplate after wiring is com-
plete.
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 separate 24 volt transformer (not provided) to
power the thermostat.
2. Snap thermostat onto wallplate after wiring is com-
plete.
NOTE: When the THX9321 thermostat is used with a
TrueZONE Wireless Adapter, the relays in the ther-
mostat do not function.
Fig. 20. Inserting wires in thermostat terminal screws
13
®
IAQ WITH EIM
(THX9421).
68-0311—08