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■ This thermostat is 24V AC powered and requires connection to both sides of the transformer for proper operation. It also
requires four charged “AA” ENERGIZER
®
brand batteries or equivalent alkaline batteries as a back-up source of power
should the 24V AC circuit be interrupted temporarily due to a power outage. The battery back-up will maintain all program
information during power outage.
■ 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.
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HELPFUL PROGRAMMING TIPS
SYSTEM
■ 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.
■ 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.
Symptom Remedy
Heat turns on instead of cool and Check wiring and system specifications.
vice versa.
Thermostat turns on and off too much. Increase temperature differential setting. (See “PROGRAMMING.”)
Display is indicating “LO BATT.” Replace back-up batteries soon. Be sure battery installation is correct.
(See “REPLACING THE BACK-UP BATTERIES.”)
Thermostat beeps once per minute Back-up batteries low. Change batteries immediately. (See "REPLACING
and "LO BATT" is indicated in display. THE BACK-UP BATTERIES".)
LCD display is blank. Replace batteries to control system. (See "REPLACING THE BACK-UP
BATTERIES".)
Thermostat does not change when SYSTEM button is in OFF or is in AUTO (changeover) position.
the
∨
or
∧
buttons are pressed.
Thermostat beeps and does not allow Autochangeover "deadband" conflict (See "SELECTING AUTO
temperature changes when
∨
or
∧
CHANGEOVER".) or thermostat is locked.
buttons are pressed.
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