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T8600D, T8601D AND T8602D CHRONOTHERM
®
IV DELUXE PROGRAMMABLE THERMOSTATS
68-0164—1
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Table 12. Troubleshooting Information (continued).
Symptom Possible Cause Action
Heating or cooling
come on
momentarily and
shut off
Heat or cool circuit is opening
up or becoming high
impedance.
Add resistor in parallel with load or install interface relay.
System on indicator
(flame=heat,
snowflake=cool) is
displayed, but no
Fan operation set for 0
(conventional heat) when it
should be set for 1 (electric
heat).
Enter Installer Setup number 2 and reconfigure the fan operation.
warm or cool air is
coming from the
registers.
Conventional heating
equipment turns on the fan
when the furnace has
warmed up to a setpoint.
Wait a minute after seeing the on indicator and then check the registers.
Heating or cooling equipment is
not operating.
Verify operation of heating or cooling equipment in self-test.
Outdoor
temperature not
displayed
a
Option not activated. Enter Installer Setup number 24 and set to 1. Thermostat must have OT
terminals and a C7089B1000 installed.
Outdoor
temperature
Outdoor sensor is connected
incorrectly.
Refer to C7089B1000 installation instructions and check wiring between
the thermostat and sensor.
display is incorrect
a
Wrong sensor. Replace sensor with C7089B1000 sensor.
a
Available on select models.
Feature/Function Chronotherm® III Family Chronotherm® IV Family
Programming 5-1-1 day programming 7-day programming
Changeover Automatic or manual changeover models
available
Automatic/manual changeover selectable
Installer configuration Field settings made via screws on the back of
the thermostat
Field settings made through the keyboard
System switching Mechanical switch Keyboard entry
Fan switching Mechanical switch Keyboard entry
Device color Beige or Premier White® color Taupe or Premier White® color
CROSS REFERENCE
All SUPER TRADELINE® Chronotherm® IV thermostats are
different from the existing Chronotherm® III devices as
summarized in Table 13.
Refer to Table 14 for thermostat cross referencing information.
Table 13. Differences Between Chronotherm® III Thermostats and Chronotherm® IV Thermostats.
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