Lennox International Inc 51M37 operation manual Hold − Using Temperature Hold Modes

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 tem- perature setpoint in Hold mode is 70°F.

To adjust the setpoint, press the UP or DOWN (YB) arrow buttons (see figure 9); 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.

Hold Temperature Mode

			Heat	Cool
MO	I0:36 FAN		Prog	Day/Time
PM
AM
		HOLD AUTO
ROOM		SYSTEM
		SETPOINT COOL
72° 68°			Fan	Hold
			Settings Enter

Figure 9

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 9). 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; flashes (see figure 10). This overrides the pro- gram for 2 hours from the last button press, then returns to the program.

Temporary Hold Temperature Mode

		Heat	Cool
MO		Prog	Day/Time
PM I0:36 FAN
AM
PROG B HOLD AUTO
ROOM	SYSTEM
	SETPOINT COOL
72° 68°		Fan	Hold
		Settings	Enter

Figure 10

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).

PROG − Thermostat Programming

The 51M35 thermostat can be programmed to perform a set of either heating or cooling events (but not a combination of heat and cool) for 5 consecutive days using a set of 4 unique events per day. The remaining 2 days can then be set for a different set of 4 unique events per day. Both the consecutive days and the events/temperature are set by the homeowner.

To Change Consecutive Days...

To alter the 5 consecutive days, press and hold the PROG button for 5 seconds. The existing 5 consecutive day peri- od is then displayed (default is MOnday thru FRiday). To change to a different 5-consecutive days, use the Up/ Down arrow buttons. Any 5 consecutive−day span may be selected, for example, in figure 11, Saturday through Wednesday is defined as the 5−day programming (Thurs- day and Friday would constitute the 2−day programming). Press the PROG button when finished.

Change Consecutive days

MO TU WE TH FR SA SU FILTER

Figure 11

To Set Program Events and Temperatures...

Figure 12 gives an example of how the two sets of pro- grams can be set for a normal workweek and weekend. In the 5−day bar graph, note how 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 re- flects a cool sleeping temperature. The 2−day bar graph would support day−long occupancy and, because the first program begins later, a less−demanding time schedule.

5/2 Program Example

5−DAY PROGRAM: A B C D

72°

68°

64°

6AM NOON 6PM MID 6AM NIGHT

2−DAY PROGRAM: A B C D

72°

68°

64°

6AM NOON 6PM MID 6AM NIGHT

Figure 12

NOTE − Pressing ENTER during the following program- ming steps, saves and exits to the HOME screen.

To program events and temperatures, perform the follow- ing steps, once with Cool selected and once with Heat se- lected.

1.Press and release PROG. AM 6:00", period

the 5 consecutive days are displayed; AM 6" flashes.

2.Use the Up/Down arrow buttons to select the desired hour; press PROG when the desired hour is reached.

3.Use the Up/Down arrow buttons to select the desired minute; press PROG.

4.Use the Up/Down arrow buttons to select the desired temperature setpoint; press PROG.

5.Repeat steps 2 through 4 for periods B, C, and D.

6.Repeat steps 1 through 5 for the 2−day program.

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