Lennox International Inc 51M37 operation manual I026

Page 43

 

 

Reminders

PROG

MO

I0:26

AM

A B C D

 

HOLD PM

To adjust the balance point up or down, press the Up/Down arrow buttons to the right of the display screen. The bal- ance point setting increases by 1°F each time the Up but- ton is pressed and decreases by 1°F each time the Down button is pressed. After the desired balance point setting is

FAN ON

AUTO

FILTER SERVICE

MAINTENANCE

ROOM

76°

COOL

OFF

AUTO

EMG.

HEAT

Filter &

Maintenance

Indicators

reached, the HOME screen will reappear after about 15 seconds.

NOTE − The balance point feature allows the outdoor tem- perature to rise or fall 3°F above or below the balance point. This prevents excessive cycling of the equipment when the outdoor temperature is near the balance point. For example, if the balance point is 40°F and the actual

FAN ON

AUTO

FILTER SERVICE

MAINTENANCE

ROOM

76°

COOL

OFF

AUTO

EMG.

HEAT

Service

Indicator

Flashing

outdoor temperature is 35°F, the outdoor temperature must rise to 43°F before equipment adjustment occurs. Conversely, if the balance point is 40°F and the actual out- door temperature is 45°F, the outdoor temperature must drop to 37°F before equipment adjustment occurs.

Service Indicator

When abnormal equipment operation is detected, the

Figure 19

After the filter has been changed or maintenance per- formed, reset the reminder by pressing the SETTINGS button for 4 seconds at the corresponding reminder set- tings screen. The screen will blink for a few moments to in- dicate that the timer has been reset.

SETTINGS − Balance Point

NOTE − The balance point is only available with the out- door sensor.

When the outdoor sensor (X2658) is connected to the 51M42 thermostat, balance point adjustment is available. The balance point feature allows the measured outdoor temperature to govern operation of the heat pump and backup heat source.

Press the SETTINGS button three times to access the Bal- ance Point Settings screen (see figure 20).

Balance Point Setting

SETPOINT

6p 55°

Figure 20

The balance point can be set at any temperature between 1°F and 55°F (−17°C to 13°C). A balance point setting of zero disables the balance point function (in this case, the thermostat behaves as if no outdoor sensor is attached). The default balance point setting is 55°F.

SERVICE indicator will flash on the screen (see figure 19 on page 7). This indicates that the equipment requires service from a qualified service technician.

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 designed 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 ther- mostat, below the SETTINGS button (see figure 3). Use a paper 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/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 replace it, first position the top tilted toward the wall bracket 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.

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51M42 SERIES 5/2

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Contents 51M37 Merit Series Home Screen Buttons, Backlight, Timers & SettingsDAY/TIME − Setting the Day and Time Thermostat ButtonsFAN Heat − Using the Heat ModeTurn Cool ON/OFF Cool − Using the Cool ModeEnabling and Disabling Cool Mode Cool Mode DisabledPM I036 FAN I036 FANFAN − Controlling the Fan Operation Settings − Filter/Maintenance RemindersRemoving/Installing Thermostat Settings − Balance PointService Indicator Thermostat ResetTechnical Specifications Default Thermostat SettingsMaintenance Reminder Smart Setback Recovery via DIP switch #6Equipment Protection Timers Over−Temperature ProtectionCooling Demands Thermostat Output TableHeating Demands 51M35 Merit Series Thermostat 51M35 Merit Series505049M 5/1/05 Turn Heat ON/OFF Heat − Using the Heat Mode Cool − Using the Cool ModeEnabling and Disabling Heat Mode Heat/Cool Mode DisabledHold − Using Temperature Hold Modes 1st press I0i4 Removing and Installing Thermostat51M35 Terminal Designations Electric Heat, Auto Fan Thermostat OutputsGas Heat, Auto Fan Gas Heat, Continuous 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 530 Heat/Cool Mode Disabled Cooling DemandI030 Auto − Using the Autochangeover Mode Copy a Programmed Day to An other Day Service Indicator Flashing Displaying Outside TemperatureCheck Outside Temperature Filter Maintenance IndicatorsDefault Program Settings Time & Temp 51M39 Terminal Designations Indoor Temperature Measurement RangeOutdoor Temperature Measurement Range Autochangeover Deadband Selection via DIP switch #7Thermal-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 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.

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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