Lennox International Inc 51M32 operation manual Fan Control, Filter Reminder

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Fan Control

The FAN button is located behind the small door on the right-hand side of the thermostat. See figure 3. The FAN button can be used to select either continuous fan mode or auto fan mode.

If continuous fan mode is enabled, the fan will run continu- ously regardless of whether the heating or cooling equip- ment is running. Also, ON will be displayed in the FAN box as shown in figure 9.

Fan ON with Icon

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FAN

ON

SYSTEM

HEAT

Figure 9

If auto fan mode is selected, the fan will only run when the heating or cooling equipment is running. In this case, AUTO will be displayed in the FAN box as shown in figure 10.

Fan AUTO with Icon

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FAN

AUTO

SYSTEM

HEAT

Figure 10

To change from continuous to auto fan mode and vice versa,

press the FAN button. Also note the presence of a fan icon in

the FAN box. This icon indicates that the fan is running.

Filter Reminder

The 51M32 thermostat includes a filter reminder feature. The filter reminder can be set for 1, 3, 6, or 12−month inter- vals. The SETTINGS button, located behind the door on the right−hand side of the thermostat is used to set the filter

reminder interval. See figure 3. Press the SETTINGS but- ton from the HOME screen to display the Filter Reminder Settings screen as shown in figure 11.

Filter Reminder Settings

0 Filter

Figure 11

The default setting for the filter reminder is 0, which dis- ables the function. Use the UP arrow while in the Filter Re- minder Settings screen to select the desired interval be- tween reminders. It may be necessary to press the UP arrow several times to access the desired setting. The HOME screen will reappear about 10 seconds after the ar- row key has been pressed for the final time.

After the programmed interval has elapsed, the FILTER re- minder will be displayed as shown in figure 12. After the fil- ter has been changed, reset the filter reminder by pressing the SETTINGS button for 4 seconds. The screen will blink for a few moments to indicate that the timer has been reset.

Display of Filter Reminder

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FILTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN

 

 

 

AUTO

 

 

 

 

 

 

 

 

 

 

 

 

 

SYSTEM

 

 

HEAT

 

 

Figure 12

 

 

 

 

 

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Contents Table of Contents Initial Thermostat Power-upMeritR Series Thermostat GeneralHeat Mode Enabled Heat Mode DisabledHeating Control Display − Home ScreenAdjusting Temperature Setpoint Enabling and Disabling Cool ModeSetpoint Display and Adjustment Cooling ControlFan Control Filter ReminderService Indicator Thermostat ResetDefault Thermostat Settings Technical SpecificationsThermostat Output Table Controls 51M33 Additional Thermostat Buttons Normal Heat Mode Emergency Heat ModeNormal Heat Mode Enabled Emergency Heat Mode EnabledCooling Control Fan Control Service Indicator Flashing Room Balance Point SettingBalance Point 51M33 Terminal Designations Backup Heat Source SelectionBalance Point Thermostat Output Table Electric Heat Backup − No Outdoor Sensor Gas Heat Backup Dual Fuel − No Outdoor SensorElectric Heat Backup − Outdoor Sensor Attached Gas Heat Backup Dual Fuel − Outdoor Sensor Attached