Thermostat Output Table - Lennox 51M34 5/2 Operation Manual

5/2 day programmable thermostat

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Maintenance Reminder

Settings of Off, 6 or 12 (months of chronological time) are

available. When programmed time has elapsed, a mainte-

nance indicator MAINT" is displayed.

Service Reminder

The SERVICE indicator is displayed only under the follow-

ing conditions:

if the thermostat Y1 terminal has been activated with

24VAC for at least 5 minutes, AND the L terminal is

shorted to the R terminal;

if the thermostat Y1 terminal has been activated with

24VAC for at least 5 minutes, AND the L terminal is

shorted to the C terminal.

Power Loss/Recovery

Thermostat memory is retained for a minimum of 24 hours

during a power loss (includes retention of program infor-

mation, HOLD status, programmed temperature setpoint,

heat/cool and fan mode settings, filter reminder status,

maintenance reminder status, and equipment protection

timers). After 24 hours of power loss, programmed settings

will be lost and replaced with default settings.

IMPORTANT

Power must be applied for at least six consecutive

hours prior to a power loss in order for memory to

be retained for the specified time.

LCD Backlight

Activated for 30 seconds when any button is pressed.

NOTE − During an electrical storm or similar disturbance,

the backlight may activate for a few seconds. This is nor-

mal and will no longer occur after the electrical disturbance

has passed.

505048M 08/07

Thermostat Operating Conditions

35°F to 105°F, 5% to 90% RH

Thermostat Storage Conditions

−40°F to 185°F, 5% to 95% RH