THX9321/9421 Prestige
®
IAQ and RF EIM
3
69-2490—03
MCR29241
MCR32386
Install thermostat
1
•
THX9421:
Mount the thermostat and wire to C and R terminals of the
Equipment Interface Module (EIM), or to a separate 24 volt transformer (not
provided).
•
THX9321:
Install and wire as above if using EIM. If not, see pages 13-15.
See pages 10-17 for detailed wiring guidelines
MCR32387
MCR32389
R
C
Y
Y2
G
L
W
O/
B
W2
AUX1
W3
AUX2
Strip 1/4” insulation, then insert wires as shown.
Install Equipment Interface Module (if used)
2
[If no EIM is used, skip to Section 3.]
Use screws & anchors as appropriate for the mounting surface. Mount the EIM
near the HVAC equipment, or on the equipment itself.
MCR32388
NOTE: If you install more than one thermostat and
EIM, the EIMs must be at least 2 feet apart.
If installing a
discharge/return air sensor
, it must
be located between the IAQ equipment and the
heating/cooling equipment. The sensors must be
in air that is mixed well (away from a-coil/heat
exchanger). See page 7.
When used with the EIM, the relays in the thermostat do not function.
69-2490_B.indd 3
7/13/2011 1:41:48 PM
