Backup Control; Replacing A Thermostat - Honeywell Home THX9321 Prestige 2.0 Manual

Calibration - Indoor Sensor
The C7189U1005 Wall Mount Temperature Sensor is
calibrated at the factory and cannot be recalibrated in the
field.
Table 12. C7189U1005 Sensor Resistance at
Room Temperature.
Room
Temperature
Ohms of
°F °C Resistance
40 4.4 22537
42 5.6 21516
44 6.7 20546
46 7.8 19626
48 8.9 18754
50 10.0 17926
52 11.1 17136
54 12.2 16387
56 13.3 15675
58 14.4 14999
60 15.6 14356
62 16.7 13743
64 17.8 13161
66 18.9 12607
68 20.0 12081
70 21.1 11578

BACKUP CONTROL

This section explains when backup control is used. For
example, if batteries in the wireless indoor sensors are
depleted.
If the Thermostat is Part of the
Temperature Average
1. The thermostat controls the system using the
remaining sensors that are part of the temperature
average.
2. If there are no remote indoor sensors remaining, the
thermostat controls the system using its internal
sensor.
3. If the internal thermostat sensor is not available and
a Return Air Sensor is connected, the Backup Control
in the EIM is used. The backup control maintains 55
°F in heat, 85 °F in cool and operates the fan continu-
ously to sense and control temperature.
Room
Temperature
Ohms of
°F °C Resistance
72 22.2 11100
74 23.3 10644
76 24.4 10210
78 25.6 9795
80 26.7 9398
82 27.8 9020
84 28.9 8659
86 30.0 8315
88 31.1 7986
90 32.2 7672
92 33.3 7372
94 34.4 7086
96 35.6 6813
98 36.7 6551
100 37.8 6301
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®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
If the Thermostat is NOT Part of the
Temperature Average
1. The thermostat controls the system using the
remaining sensors that are part of the temperature
average.
2. If there are no remote indoor sensors remaining and
a Return Air Sensor is connected, the Backup Control
in the EIM is used. The backup control maintains 55
°F in heat, 85 °F in cool and operates the fan continu-
ously to sense and control temperature.

REPLACING A THERMOSTAT

When you replace a thermostat, you must reset the
RedLINK accessories before connecting them to the new
thermostat.
Follow the instructions below:
At the Equipment Interface Module (EIM)
1. Press and hold the CONNECT button on the EIM until
the CONNECTED LED glows amber (hold for about
10 seconds).
2. Follow the prompts on the screen to connect the new
thermostat to the EIM. See page 10.
At the Portable Comfort Control
1. Press and hold the blank space (or arrow) in the lower
right hand corner of the screen until the display
changes (hold for about 4 seconds).
2. Press REMOVE, then YES to disconnect from the old
thermostats.
3. To reconnect the thermostat, go to "Linking
RedLINK™ Accessories" beginning on page 16.
At the Indoor Sensor, RedLINK Internet
Gateway, Entry/Exit Remote, Vent-Filter
Boost Remote or TrueSTEAM Wireless
Adapter
1. Press and hold the CONNECT button on the acces-
sory until the status light glows amber (hold for about
10 seconds).
2. To reconnect the thermostat, go to "Linking
RedLINK™ Accessories" beginning on page 16.
133
®
IAQ WITH EIM
Press and hold
the blank space
(or arrow may be
present)
Fig. 321.
68-0311—08