Lennox International Inc 51M37 operation manual 530, I030, Heat/Cool Mode Disabled Cooling Demand

Page 29

HEAT − Using the Heat Mode

Enabling and Disabling Heat Mode

The thermostat must be in the heat mode to control the heating equipment. Press the HEAT button to enable or disable HEAT mode. If the thermostat is in cool or off mode, pressing the HEAT button enables the heat mode (indicated by HEAT in the lower right corner − see figure 4).

 

 

Turn Heat ON/OFF

 

 

 

Heat

Cool

 

 

 

Prog

Auto

 

 

5:30

 

 

 

82

Copy Day/Time

 

 

 

 

 

70

66

Fan

Hold

(DOOR

 

 

 

 

 

 

OPEN)

 

 

Settings Enter

 

 

 

 

(Outside)

 

Figure 4

COOL − Using the Cool Mode

Enabling and Disabling Cool Mode

Use the COOL button to enable or disable cool mode as desired. If the thermostat is in heat or off mode, cool mode is enabled when the COOL button is pressed. This is indi- cated by COOL on the right side of the display (see figure 8).

 

 

Turn Cool ON/OFF

 

 

 

Heat

Cool

 

 

 

Prog

Auto

 

 

i0:30

 

 

 

70

Copy Day/Time

 

 

 

 

 

75

66

Fan

Hold

(DOOR

 

 

 

 

 

 

OPEN)

 

 

Settings Enter

 

 

 

 

(Outside)

 

Figure 7

If the thermostat is in heat mode, heat mode is disabled when the HEAT button is pressed. This is indicated by OFF near the right side of the display as shown in figure 5.

If the thermostat is in cool mode, pressing the COOL but- ton disables cool mode (indicated by OFF in the SYSTEM box − see figure 5).

Heat/Cool Mode

 

Disabled

 

Cooling Demand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ROOM

 

 

 

OFF

 

 

Set the thermostat to cool mode to control the cooling

75

 

75

 

 

 

 

 

°

 

HEAT SETPOINT

 

equipment. Then, if the room temperature is higher than

 

 

 

°

 

 

 

 

 

 

 

 

 

 

the temperature setpoint, as shown in figure 7, the thermo-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

stat detects a cooling demand and will activate the cooling

 

 

 

 

 

 

 

 

Figure 5

 

 

 

 

 

equipment to satisfy the demand.

 

 

 

 

Heating Demand

 

 

 

 

 

 

 

Cooling operation is indicated by flashing nowflake"

Set the thermostat to heat mode to control the heating

icons on the right side of the display. When the actual tem-

equipment. Then, if the room temperature is lower than the

perature drops below the temperature setpoint, the snow-

temperature setpoint, as shown in figure 6, the thermostat

flake icons will disappear. This indicates that the cooling

detects a heating demand and will activate the heating

demand has been satisfied and that the cooling equipment

equipment to satisfy the demand.

 

 

 

 

has been turned off.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If your system supports 2−stage cooling (as does the

Heating Demand

 

 

 

 

 

 

 

 

51M39 thermostat), you may notice various cooling levels

ROOM

 

 

 

 

 

 

 

75

 

 

 

 

being delivered during a demand. Also, if a small cooling

72

°

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEAT SETPOINT

 

demand is present, "Lo" will be displayed in the SYSTEM

 

 

 

 

°

HEAT

 

 

box. However, if a large cooling demand is present, "Hi" will

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

be displayed in the lower right corner (shown in figure 8).

 

 

 

 

 

 

 

 

Figure 6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating operation is indicated by a flame icon in the lower

 

Cooling Demand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

right corner. When the actual temperature rises above the

 

 

 

 

COOL SETPOINT

 

 

 

 

FAN

 

76

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

temperature setpoint, the flame icon will disappear. This

 

 

 

 

 

 

 

 

 

AUTO

 

°

 

 

 

indicates that the heating demand has been satisfied and

 

 

 

 

 

 

COOL

 

 

that the heating equipment has been turned off.

 

 

 

 

 

 

 

 

 

If your system supports 2−stage heating (as does the

 

ROOM

 

 

 

 

 

 

°

 

HEAT SETPOINT

 

 

 

51M39 thermostat), you may notice various heating levels

 

Lo

 

 

 

 

 

 

 

 

 

80

 

 

68

°

 

being delivered during a demand.

 

 

 

 

 

 

 

 

 

 

 

Hi

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE − Heating equipment is activated for at least 3 min-

 

 

 

 

 

 

 

 

 

 

 

 

Figure 8

 

 

 

 

utes if no buttons are pressed during the demand interval.

 

 

 

 

 

 

 

Page 3

51M39 SERIES 5/2

Image 29
Contents 51M37 Merit Series DAY/TIME − Setting the Day and Time Buttons, Backlight, Timers & SettingsThermostat Buttons Home ScreenFAN Heat − Using the Heat ModeEnabling and Disabling Cool Mode Cool − Using the Cool ModeCool Mode Disabled Turn Cool ON/OFFPM I036 FAN I036 FANFAN − Controlling the Fan Operation Settings − Filter/Maintenance RemindersService Indicator Settings − Balance PointThermostat Reset Removing/Installing ThermostatTechnical Specifications Default Thermostat SettingsEquipment Protection Timers Smart Setback Recovery via DIP switch #6Over−Temperature Protection Maintenance ReminderHeating Demands Thermostat Output TableCooling Demands 51M35 Merit Series Thermostat 51M35 Merit Series505049M 5/1/05 Enabling and Disabling Heat Mode Heat − Using the Heat Mode Cool − Using the Cool ModeHeat/Cool Mode Disabled Turn Heat ON/OFFHold − Using Temperature Hold Modes 1st press I0i4 Removing and Installing Thermostat51M35 Terminal Designations Gas Heat, Auto Fan Thermostat OutputsGas Heat, Continuous Fan Electric Heat, Auto Fan51M34 Merit Series Thermostat 51M34 Merit Series505048M 5/1/05 51M34 Series 5/2 I036 FAN OFF I0i4 51M34 Terminal Designations Heat Demand Cool Demand No Demand 51M39 Merit Series Thermostat 51M39 Merit SeriesI026 I030 Heat/Cool Mode Disabled Cooling Demand530 Auto − Using the Autochangeover Mode Copy a Programmed Day to An other Day Check Outside Temperature Displaying Outside TemperatureFilter Maintenance Indicators Service Indicator FlashingDefault Program Settings Time & Temp Outdoor Temperature Measurement Range Indoor Temperature Measurement RangeAutochangeover Deadband Selection via DIP switch #7 51M39 Terminal DesignationsThermal-mechanical switch opens W1 and W2 at 93F+/−6F Page −Day Programmable Thermostat 51M42 Merit Series51M42 Merit Series Thermostat 505069M 07/05 Large Heat Heating Demand FAN Auto MID Reminder Settings Display Using Fan on I026 With Electric Backup no outdoor sensor Default Program Settings − Time & TempTechnical Specifications 51M42 Terminal Designations 51M38 Merit Series Thermostat 51M38 Merit SeriesY/TIME button 51M38 Series 5/2 Hold − Using Temperature Hold Modes Repeat steps a and B for as many days as you Settings Thermostat Output Table 51M38 Terminal Designations

51M37 specifications

Lennox International Inc, a prominent player in the heating, ventilation, and air conditioning (HVAC) market, has made significant strides in innovation and technology in recent years. Among its notable offerings is the Lennox 51M37, a well-engineered component designed to enhance HVAC efficiency and reliability.

The 51M37 is primarily known for its advanced motor technology, incorporating ECM (Electronically Commutated Motor) design, which significantly reduces energy consumption compared to traditional motor systems. This motor type is key to Lennox's commitment to sustainability, as it not only maintains optimal performance but also minimizes the carbon footprint associated with residential and commercial heating and cooling tasks.

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In terms of compatibility, the 51M37 is engineered to work seamlessly with a variety of Lennox heating and cooling units, ensuring versatility for both new installations and retrofits. This compatibility enhances system integration, resulting in improved overall performance.

The construction of the 51M37 emphasizes durability and reliability, featuring high-quality materials that withstand the challenges of constant operation. Its robust design is perfect for diverse environments, ensuring that it functions reliably in both residential settings and commercial applications.

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Overall, Lennox International's 51M37 embodies innovation, efficiency, and reliability in HVAC technology. With its advanced ECM motor, intelligent controls, and durable construction, it stands as a prime example of how modern HVAC solutions can lead to enhanced performance and energy savings. As the industry continues to evolve, products like the 51M37 will play a critical role in shaping the future of heating and cooling, aligning with sustainability goals and meeting the needs of consumers.