20
FEATURES AND ACCESSORIES
Home, Away, Sleep (programmable models only)
This feature provides three button selections which select from three predetermined
pairs of heat and cool setpoints. In programmed versions, one of these three choices
can be selected for any programmed period. To change these settings, a temperature
is first selected and then the key pressed and held, similar to setting stations on a
push--button radio. See Owner’s Manual for details.
Clock (programmable models only)
Without batteries the clock will continue to operate for 8 hours while power is
removed. With batteries, the clock operates until the end of the battery life.
Batteries
Battery operation is available for installations where there is no common (C) wire
available at the thermostat or where operation is to continue while the thermostat is
removed from the wall, usually to facilitate remote (armchair) programming. For
battery operation, install two alkaline AA batteries. The thermostat is designed to
operate up to one year on a set of batteries. A battery indicator on the display warns
when battery replacement is needed. See Homeowners Guide for details. If batteries
are installed and the thermostat is operated from 24VAC power, battery operation
will occur only when 24VAC power is not present. The changeover between
24VAC power and battery power is automatic.
Display Lighting
The display has two levels of lighting, high level and low level. High level lighting
comes on for 10 seconds when the door is opened and/or buttons are being pressed
with 24VAC and with batteries. Low level lighting is only available if the
thermostat is operated from 24VAC. It is not available with batteries. The low level
can be selected (see Option 18) for continuous backlight.
