Lennox International Inc. 51M37 - Manual (Page 50)

Page 4
505067M 7/13/05
HOLD − Using Temperature Hold Modes
When HOLD is displayed at the HOME screen, the ther-
mostat is in a temperature hold condition. This means that
the temperature program data is ignored and the thermo-
stat functions much like a non−programmable thermostat.
Adjusting Temperature Setpoint in Hold Mode
The temperature setpoint represents the desired tempera-
ture of the space around the thermostat. The default heat
setpoint in hold mode is 70°F; the default cool setpoint in
hold mode is 78°F.
To adjust the setpoint, press the UP or DOWN (
YB) arrow
buttons (see figure 8); the existing setpoint is displayed to
the right of the actual room temperature. Each button
press adjusts the setpoint up or down by 1 degree.
Heat
Prog
Fan
Settings
Cool
Day/Time
Hold
Enter
Hold Temperature Mode
Figure 8
(DOOR
OPEN)
Auto
Copy
(Outside)
70
i0:30
80
78
After the desired setpoint is reached, the HOME screen
will reappear after about 15 seconds.
Permanent Hold Mode
At any time the program is running, from the HOME
screen, set a permanent hold (program override) by press-
ing the HOLD button (see figure 8). The thermostat now
functions much like a non−programmable thermostat. Use
the Up/Down arrow buttons to adjust the hold setpoint. To
return to the program, press HOLD again.
Temporary (2-Hour) Hold
At any time the program is running, from the HOME
screen, set a temporary 2-hour hold by pressing the Up/
Down arrow buttons until the desired setpoint is displayed;
HOLD" flashes (see figure 9). This overrides the program
for 2 hours from the last button press, then returns to the
program.
While in Temporary Hold, press HOLD once to switch to
Permanent Hold (HOLD displays solid; PROG not dis-
played); press HOLD again to return to the program
(PROG displays; HOLD not displayed).
Heat
Prog
Fan
Settings
Cool
Day/Time
Hold
Enter
Temporary Hold Temperature Mode
Figure 9
(DOOR
OPEN)
Auto
Copy
(Outside)
68
i0:30
72
70
PROG − Thermostat Programming
The 51M38 thermostat can be programmed to perform a
set of both heating and cooling events for each day of the
week. Each day can be programmed for 4 unique events
per day, and each day can be different from any other day.
To Set Program Events and Temperatures
Figure 10 gives an example of how up to 7 different pro-
grams can be set. Programs A and C reflect the desired
warmth while the home IS occupied (72°); B allows less
heating while the home is NOT occupied; D reflects a cool
sleeping temperature.
NOTE − The example in figure 10 shows heat setpoints; a
similar program may be set for cool setpoints.
Figure 10
Program Example
6AM NOON 6PM MID 6AM
NIGHT
A
B
D
A
B D
A
B D
A
B D
A
B
C
D
A B
C
D
A
B
C
D
C
C
C
C
SATURDAY PROGRAM: 72°
68°
64°
SUNDAY PROGRAM: 72°
68°
64°
FRIDAY PROGRAM: 72°
68°
64°
THURSDAY PROGRAM: 72°
68°
64°
WEDNESDAY PROGRAM: 72°
68°
64°
TUESDAY PROGRAM: 72°
68°
64°
MONDAY PROGRAM: 72°
68°
64°
NOTE − Pressing the ENTER button during the following
programming steps, saves and exits to the HOME screen.
To program events and temperatures, perform the follow-
ing steps.