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 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.

	Hold Temperature Mode
		Heat	Cool
	i0:30	Prog	Auto
	78	Copy Day/Time
80	70	Fan	Hold	(DOOR
				OPEN)
		Settings Enter
			(Outside)

Figure 8

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;

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).

Temporary Hold Temperature Mode
		Heat	Cool
	i0:30	Prog	Auto
	70	Copy Day/Time
72	68	Fan	Hold	(DOOR
				OPEN)
		Settings Enter
			(Outside)

Figure 9

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.

Program Example

MONDAY PROGRAM: 72°
68°	A		C
		B	D
64°

TUESDAY PROGRAM: 72°
68°	A	C
64°	B	D
WEDNESDAY PROGRAM: 72°
68°	A	C
64°	B	D

THURSDAY PROGRAM: 72°
68°	A		C
64°		B	D

FRIDAY PROGRAM: 72°
68°	A		C
64°		B	D

SATURDAY PROGRAM: 72°			A			C
68°					B
64°							D
SUNDAY PROGRAM: 72°
		A				C
68°
					B
							D
64°
	6AM			NOON 6PM		MID		6AM
						NIGHT

Figure 10

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.

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505067M 7/13/05