Unit Part (Catalog) And Serial Number; Memory Protection - Lennox ComfortSense 7500 Installation And Setup Manual

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Unit Part (Catalog) & Serial Numbers
A label on the back of the thermostat is visible
through an opening in the back of base plate. This
identifies the Lennox Catalog Number, Part
Number and Serial Number. Separate the base
plate from the thermostat to see additional
manufacturing information.

Memory Protection

The thermostat stores all the information
concerning its programming (state, mode,
program information, last temperature measured)
in a nonvolatile memory.
This function avoids the loss of the state of the
thermostat when a power-down occurs. The only
thing that might be lost is the clock and date
information, however, a super capacitor will
Yes De-Energized
No De-Energized
- Energized
remember clock / date information for as long as it
has a charge (approximately 24 hours). When
power down occurs (due to a power outage) the
thermostat is able to shut off heat relays (Y1, Y2,
W1, W2) when in heating mode and W1 and W2
when in cooling mode. The O and B relay will
maintain their last state. When power is restored
the thermostat will be in heat /cool mode so either
mode can run to re-satisfy the temperature
setting. Day and time (schedules) may be off due
to battery loss
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