Lennox International Inc 51M37 I0, Buttons, Backlight, Timers & Settings, Hold, Prog, A B C D

Models: 51M37

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HOLD

Within a few seconds, the HOME screen appears (see fig- ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed.

NOTE − Tables 2 and 3 on page 7 show all system and programming defaults.

HOME Screen

 

HOLD

 

MO

I0:26

 

 

PM

 

PROG

AM

 

 

 

 

A B C D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN ON

 

 

 

 

 

AUTO

 

 

 

 

COOL

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

ROOM

 

AUTO

70°

 

EMG.

 

 

 

HEAT

 

 

 

 

 

 

 

 

 

 

 

 

Figure 2

At this point, the thermostat will be fully functional; its de- fault temperature setpoint (not shown) is 70°F. At this point, if the equipment has been fully powered and if a heat demand were present, the system would begin operating.

NOTE − Temperature scale default is Fahrenheit units but may be reset to show Celsius, if desired. See page 8.

Buttons, Backlight, Timers & Settings

Buttons are located behind the small door on the right− hand side of the thermostat (see figure 3).

I0:26 IMPORTANT

Do NOT begin pressing buttons until after you read the following section describing each button.

A pale blue display backlight illuminates for 30 seconds each time any button is pressed.

When PROG or DAY/TIME button is pressed, a field be- gins flashing, expecting another input. Start making changes within 15 seconds or the HOME screen will re- turn.

Thermostat Buttons

 

Heat

Cool

 

Prog

Auto

 

Copy Day/Time

 

Fan

Hold

(DOOR

 

 

 

 

OPEN)

Settings Enter

 

 

(Outside)

 

Figure 3

When an Arrow, HOLD, HEAT, or COOL button is pressed, SETPOINT and the temperature setting appears for 15 seconds. If desired, start making changes within 15 sec- onds or the HOME screen will return. The backlight will turn off 15 seconds after the HOME screen reappears.

DAY/TIME − Setting the Day and Time

Press the DAY/TIME button and set the CURRENT hour, minute, and day of week as follows:

1.AM12" will flash on the screen. Press the UP/DOWN arrows to change the hour. (

spond to time of day.) Press DAY/TIME OR, if adjust- ing for daylight savings time, pressing the ENTER but- ton stores the single change and exits to the HOME screen, bypassing minutes and day of week.

2.Minutes will flash. Use the UP/DOWN arrow button to display the minutes past the hour. Press DAY/TIME.

3.Day

buttons to display the current day. Day selections are abbreviated as

and Y/TIME.

4.The HOME screen reappears; confirm day and time are correct. This completes day and time setting.

Page 2

505068M 07/05

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Lennox International Inc 51M37 I0, Buttons, Backlight, Timers & Settings, DAY/TIME − Setting the Day and Time, Hold, Prog