Lennox International Inc 51M37 operation manual I0i4, Removing and Installing Thermostat

Page 16

Service Indicator

When abnormal equipment operation is detected, the SERVICE indicator will flash on the screen (see figure 17). This indicates that the equipment requires service from a qualified service technician.

Service Indicator Flashing

MO TU

WE

TH

FR SA

SU

FILTER

 

 

 

 

 

 

I0:i4

 

SERVICE

AM

 

FAN

PM

 

 

 

 

ON

 

 

 

 

 

PROG

 

 

 

 

AUTO

ROOM

 

 

 

SYSTEM

 

°

 

 

 

COOL

 

 

 

 

OFF

79

 

 

 

 

 

 

HEAT

 

 

 

 

 

Figure 17

Thermostat RESET

Under some abnormal conditions, it may be necessary to the thermostat to its default condition. Such a RE-

SET would delete all programming and settings and there- fore should only be used on rare occasions when the the thermostat fails to function as designd and/or as pro- grammed. Such an instance can occur as a result of a pow- er surge or similar electrical disturbance (e.g. after an elec- trical storm or power outage). The RESET button can be used to recover from this situation.

CAUTION

When the RESET button is pressed, ALL settings re- vert back to the defaults, including the default pro- gram (see tables 2 and 3).

The RESET button is an unlabeled, recessed button lo- cated behind the door on the right−hand side of the thermo- stat, below the SETTINGS button (see figure 3). Use a pa- per clip or small pencil to press the RESET button; ALL thermostat settings will be reset to the defaults listed in the Default Thermostat Settings section.

Removing and Installing Thermostat

The thermostat hinges on tabs on the top of the subbase; no tool is needed to remove the thermostat from the sub- base. Pivot the bottom of the thermostat outward (releas- ing the snaps), then lift up to remove.

To install it, first position the top tilted toward the wall brack- et and align it until you feel the tabs and slots engage; then, while the top is in place, pivot the bottom toward the wall until the thermostat snaps into place.

Default Thermostat Settings

Default thermostat settings are in table 2 and the default program is shown in table 3.

Table 2

Default Thermostat Settings

Mode

Heat (Permanent Hold

 

Mode)

 

 

Setpoint

70°F (or 21°C)

 

 

Fan

Auto

 

 

Filter Reminder

OFF

 

 

Maintenance Reminder

OFF

 

 

Equipment Protection

Reset Back to Zero

Timers

 

 

 

Table 3

Default Program Settings

 

 

Temperature

Temperature

Programs

Time

(Heat)

(Cool)

 

 

 

 

Weekday − A

6:00am

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekday − B

8:00am

62_F / 17°C

85_F / 29°C

 

 

 

 

Weekday − C

6:00pm

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekday − D

10:00pm

62_F / 17°C

82_F / 28°C

 

 

 

 

Weekend − A

6:00am

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekend − B

8:00am

62_F / 17°C

85_F / 29°C

 

 

 

 

Weekend − C

6:00pm

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekend − D

10:00pm

62_F / 17°C

82_F / 28°C

 

 

 

 

Weekday

Monday, Tuesday, Wednesday,

 

Thursday, Friday

 

 

 

 

Weekend

Saturday, Sunday

 

 

 

 

 

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505049M 5/1/05

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Contents 51M37 Merit Series Buttons, Backlight, Timers & Settings DAY/TIME − Setting the Day and TimeThermostat Buttons Home ScreenHeat − Using the Heat Mode FANCool − Using the Cool Mode Enabling and Disabling Cool ModeCool Mode Disabled Turn Cool ON/OFFI036 FAN PM I036 FANSettings − Filter/Maintenance Reminders FAN − Controlling the Fan OperationSettings − Balance Point Service IndicatorThermostat Reset Removing/Installing ThermostatDefault Thermostat Settings Technical SpecificationsSmart Setback Recovery via DIP switch #6 Equipment Protection TimersOver−Temperature Protection Maintenance ReminderCooling Demands Thermostat Output TableHeating Demands 51M35 Merit Series 51M35 Merit Series Thermostat505049M 5/1/05 Heat − Using the Heat Mode Cool − Using the Cool Mode Enabling and Disabling Heat ModeHeat/Cool Mode Disabled Turn Heat ON/OFFHold − Using Temperature Hold Modes 1st press Removing and Installing Thermostat I0i451M35 Terminal Designations Thermostat Outputs Gas Heat, Auto FanGas Heat, Continuous Fan Electric Heat, Auto Fan51M34 Merit Series 51M34 Merit Series Thermostat505048M 5/1/05 51M34 Series 5/2 I036 FAN OFF I0i4 51M34 Terminal Designations Heat Demand Cool Demand No Demand 51M39 Merit Series 51M39 Merit Series ThermostatI026 530 Heat/Cool Mode Disabled Cooling DemandI030 Auto − Using the Autochangeover Mode Copy a Programmed Day to An other Day Displaying Outside Temperature Check Outside TemperatureFilter Maintenance Indicators Service Indicator FlashingDefault Program Settings Time & Temp Indoor Temperature Measurement Range Outdoor Temperature Measurement RangeAutochangeover Deadband Selection via DIP switch #7 51M39 Terminal DesignationsThermal-mechanical switch opens W1 and W2 at 93F+/−6F Page 51M42 Merit Series Thermostat 51M42 Merit Series−Day Programmable Thermostat 505069M 07/05 Large Heat Heating Demand FAN Auto MID Reminder Settings Display Using Fan on I026 Default Program Settings − Time & Temp With Electric Backup no outdoor sensorTechnical Specifications 51M42 Terminal Designations 51M38 Merit Series 51M38 Merit Series ThermostatY/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.

A standout feature of the 51M37 is its intelligent control system, which allows for more precise management of airflow and temperature. This technology can adapt to specific environmental conditions and consumption patterns, optimizing performance and providing substantial cost savings on energy bills. The integration of smart technology aligns with modern demands for energy efficiency and control, making the 51M37 a vital component in achieving higher energy ratings for HVAC systems.

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.

Another characteristic worth noting is the user-friendly installation process, allowing HVAC technicians to install the 51M37 with relative ease. This not only reduces labor costs but also ensures that the system can commence operation quickly without extensive downtime.

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.
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