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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 in-
formation.
Memory Protection
The thermostat stores all the information concerning
its programming (state, mode, program information,
last temperature measured) in a nonvolatile mem-
ory.
This function avoids the loss of the state of the ther-
mostat when a power-down occurs. The only thing
that might be lost is the clock and date information,
however, a super capacitor will remember clock /
date information for as long as it has a charge (ap-
proximately 24 hours). When power down occurs
(due to a power outage) the thermostat is able to
shut off heat relays (Y1, Y2, Y3, W1, W2) when
in heating mode and W1 and W2 when in cooling
mode. The O and B relay will maintain its last state
when selected. When power is restored the thermo-
stat 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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