Honeywell RTH3100C Operating Manual page 13

B a tte rie s a re o p tio n a l if y o u r th e r­
m o s ta t w a s w ire d fo r A C p o w e r
w h e n in s ta lle d . In stall fre s h b a tte rie s
im m e d ia te ly w h e n th e REPLACE BATT
w a rn in g b e g in s flas h in g .
Even if th e w a rn in g d o e s n o t
a p p e a r, y o u s h o u ld re p la c e b a tte rie s
o n c e a ye a r, o r b e fo re le a vin g h o m e
fo r m o re th a n a m o n th .
B a tte rie s p ro v id e b a c k u p p o w e r
to th e d is p la y d u rin g p o w e r in te r­
ru p tio n s . All s e ttin g s a re p e r m a ­
n e n tly s to re d in m e m o ry , a n d d o n ot
re q u ire b a tte ry p o w er.
RTH3100C