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IMPORTANT SAFETY INFORMATION (CONT.)
■ Do not switch system to cool if the temperature is below 50°F (10°C). This can damage the
cooling system and may cause personal injury.
■ This thermostat is 24V AC powered and requires connection to both sides of transformer for
proper operation. It also requires four charged “AA” ENERGIZER
®
brand batteries or
equivalent alkaline batteries as a back-up power source. Should the 24V AC circuit be
interrupted temporarily due to a power outage, the battery back-up will maintain all program
information during power outages.
■ Replace back-up batteries every year or when “LO BATT” indicator appears on the thermostat
display.
■ Use this thermostat only as described in this manual.
■ Make sure the SYSTEM switch is in the HEAT or COOL position before programming.
The thermostat will not allow programming in AUTO or OFF modes. Do not program in
EMER mode.
■ Make sure you set the time of day (note AM/PM indicator) and day of week accurately to
ensure correct operation.
■ The program schedule has a winter (HEAT) and a summer (COOL) program. Both schedules will
use the same time and programmable fan settings, but can have different temperature settings.
If you change the time or programmable fan setting in one program, the opposite program will
change also.
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HELPFUL PROGRAMMING TIPS
SYSTEM
TROUBLESHOOTING
Symptom Remedy
Thermostat does not turn on system. Check wiring. (See “Installation Instructions” included with thermostat.)
Check to see if "OFF" is indicated in display. Select HEAT or COOL mode
by pressing SYSTEM button.
Compressor short cycle protection or power outage safeguards may be in
effect. Press Install/Bypass behind front door to override.
(See "COMPRESSOR PROTECTION.")
Second stage of heat or cool turns on Increase second stage temperature differential setting.
too quickly. (See "PROGRAMMING.")
System turns on as much as two hours Energy Efficient Recovery (EER™) mode is active; thermostat is operating
before the setpoint time. normally. (See "PROGRAMMING- Energy Efficient Recovery.")
Display is indicating "-AC" in time field. This indicates the thermostat has detected that the 24V AC circuit to
which it is attached is not functioning. Check wiring, fuses, and power
source to determine the cause of the problem. The back-up batteries in
this thermostat will maintain the programming until system power can be
restored. (See "24V AC CIRCUIT POWER MONITOR.")
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