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To mount the thermostat:
1. Install a 2" x 3" outlet box and the wiring
from the NexSys controller.
2. Pull the wiring from the outlet box and
insert it through the mounting bracket.
3. Assemble the mounting bracket to the
outlet box.
4. Connect the 2-wire pigtail from the
thermostat to the wires in the wall and
secure them with wire nuts. Obey wiring
polarity (see Figure 2).
5. Push excess wire into the outlet box.
6. Snap the cover onto the mounting
bracket.
Figure 4 - Mounting the Intelligent Thermostat
Room Sensor Installation - Page 2
Operation
Startup
Once activated, the Intelligent Thermostat
will display "ESUSA" then "Init. . ."
(initializing) on the LCD display window.
After five seconds, the thermostat will
send the current temperature and request
the Home Page parameter to update its
display.
If the thermostat detects a communica-
tions failure, "Com Fail" will display in the
display window for five seconds. "Retry"
will display when the thermostat attempts
to communicate again. Should the
thermostat detect a hardware or EEPROM
error, "Error" displays in the window.
www.johnsoncontrols.com
Installation and Operation - Page
2
Modes
The Intelligent Thermostat has three
operating modes: User, Configuration, and
Balance.
User Mode - In User Mode, the thermo-
stat samples the space temperature and
allows the occupant to adjust the setpoint,
display parameters, and activate the
Override function.
Configuration Mode - A technician
accesses this mode by entering a password
value using the buttons on the thermostat.
In this mode, the thermostat becomes a
basic configuration tool that allows a
technician to view and/or edit the
controller's configuration and all its
operating parameters.
Balance Mode - A technician accesses
this mode by entering a password value
using the buttons on the thermostat. This
mode allows a technician to adjust the
mechanical attributes of the entire VAV
system in order to bring the system into
proper operation.
This thermostat also provides an access
point to connect a PDA or laptop to the
thermostat communications bus. These
devices can then be used to command the
thermostat to Standby mode for one
minute periods.
Repairs and Replacement
Do not make field repairs. Please
contact Johnson Controls at (800) 765-
7773 for replacement and other services.
Johnson Controls, Inc. reserves the
right to update specifications when
appropriate. Information contained in
this document is based on specifica-
tions believed to be correct at the
time of publication.
© 2000 Johnson Controls, Inc.
All rights Reserved.
Literature Part # 24-9869-5 Rev. A
LIT-TD-2006 11/2002
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