Honeywell YRTH7500D1009 Operation Manual - Page 21
Battery replacement
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UPC - 085267257244
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Battery replacement RTH7400/RTH7500 Series Grasp thermostat and pull to remove from wallplate M28103 Batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. Install fresh batteries immediately when the LO BATT warning begins flashing. The warning flashes about 30 days before batteries are depleted. Even if the warning does not appear, you should replace batteries once a year, or before leaving home for more than a month. Insert 2 fresh AA alkaline batteries MCR28101 19 69-2744ES-01
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RTH7400/RTH7500 Series
19
69-2744ES—01
MCR28101
M28103
Battery replacement
Batteries are optional (to provide backup power) if
your thermostat was wired to run on AC power when
installed.
Install fresh batteries immediately when the
LO BATT
warning begins flashing. The warning flashes about 30
days before batteries are depleted.
Even if the warning does not appear, you should replace
batteries once a year, or before leaving home for more
than a month.
Grasp thermostat and pull to
remove from wallplate
Insert 2 fresh AA alkaline batteries