Lennox International Inc AIR HANDLERS Troubleshooting Continuous Fan Sequence of Operation, Yes

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WARNING

WARNING TO SERVICE PERSONS! Electric shock hazard. When electrical power to the internal control box components must be available for troubleshooting, a common practice is to construct a ass" of the door interlock switch. When such a by−pass is in place, a potential shock hazard is present which can cause injury or death. Make sure any door interlock switch by−pass has been removed after troubleshooting is complete and BEFORE attempting any re- pairs to the control box components!

Troubleshooting: Continuous Fan Sequence of Operation

CONDITIONS:

Power On

Normal Operation LED: Steady Flash

Thermostat (S1) Calls for Continuous Fan, G−Only

YES

Blower Operates at the Continuous Fan Speed Selected by COOL Jumper and ADJUST Jumper Positions on the BDC3 Control (A52)

YES

RUN Light on BDC3 Control (A52) illuminates to Indi- cate a Continuous Fan Call

YES

CFM Light on A52 Indicates Blower CFM Selection with 100CFM / Blink

YES

Thermostat (S1) Continuous Fan Demand Satisfied

YES

Blower Off

NO

NO

Check for 24 Volts Between ’G’ and C at A15 Terminal Strip

Check for 24 Volts Between Pins 3 and 15 on J49

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Contents Table of Contents Shipping & Packing ListIntroduction Cbwmv Unit Dimensions − inches mm TOP ViewCbwmv Unit Parts Arrangement Cbwmv Unit Optional AccessoriesGeneral Cbwmv Unit Parts DescriptionRequirements Installation − Setting EquipmentCbwmv Unit Service Clearances ApplicationDuct System Cbwmv Multi−Positional UnitReturn Air Plenum Return Air Opening Guidelines Horizontal Applications Leveling Bolt InstallationRemoving the Bottom Panel Unit Suspended in Attic or CrawlspaceFilter Assembly & Filters PlumbingElectrical Electrostatic Discharge ESD Precautions And Procedures Field Wiring Application Jumper Settings See figureRemoveable Jumpers Accessory Field Wiring TB66 & TB67 Accessory Field Wiring K212Accessory Relay Field Wiring K212 Indoor Blower SpeedsTypical Cbwmv Wiring Blower Speed Adjustments Freezestat OperationBDC3 Variable Blower Control Board Jumper Settings Factory Blower Speed Tap SettingsCBWMV−24B−040 Blower Performance CBWMV−36B−070 Blower PerformanceCBWMV−36C−090 Blower Performance CBWMV−60C−100 Blower PerformanceInitial Air Purging CBWMV−60C−120 Blower PerformanceAir Bleed Valve Location Service Filters System AdjustmentsAnnual Service Repair Parts ListTroubleshooting Continuous Fan Sequence of Operation YESTroubleshooting Cooling Sequence of Operation Troubleshooting Heating Sequence of Operation

CBWMV, AIR HANDLERS specifications

Lennox International Inc is a renowned leader in the heating, ventilation, and air conditioning (HVAC) industry, known for its commitment to innovation and energy efficiency. Among its impressive lineup of products, the CBWMV air handlers stand out as a reliable solution for optimal indoor climate control.

The CBWMV air handler is designed to provide efficient and effective airflow while being easy to install and maintain. One of the key features of the CBWMV model is its variable speed blower motor, which allows for precise control of airflow and temperature. This innovation not only enhances comfort levels within a space but also contributes to significant energy savings. By adjusting the speed of the motor according to the heating or cooling demand, the system operates more efficiently, reducing energy usage by up to 40% compared to conventional systems.

Another important characteristic of the CBWMV air handlers is their compatibility with a range of heating and cooling systems, including heat pumps and gas furnaces. This versatility makes them an ideal choice for residential and commercial applications alike. The unit’s compact design allows for flexible installation options, accommodating various spaces without compromising performance.

The CBWMV series is also engineered to provide superior air quality. With advanced filtration options, these air handlers can effectively remove dust, allergens, and pollutants from the air, promoting a healthier indoor environment. Many models come equipped with a MERV 16 filter, enhancing the filtration capability, and ensuring that occupants breathe cleaner air.

Durability is another hallmark of the CBWMV line. Constructed with high-quality materials, these air handlers can withstand rigorous use and environmental conditions. The units are designed to require minimal maintenance, with features that facilitate easy access for filter changes and routine servicing.

Additionally, the CBWMV series integrates seamlessly with Lennox’s smart technology solutions, allowing users to monitor and control their HVAC systems remotely. The compatibility with home automation systems ensures that users can optimize comfort settings and efficiency with ease.

In conclusion, Lennox International Inc's CBWMV air handlers offer a remarkable blend of efficiency, comfort, and innovative technology. With features that prioritize energy savings, air quality, versatility, and durability, they represent a forward-thinking choice for modern HVAC needs. Whether for residential or commercial use, these air handlers stand as a testament to Lennox's commitment to excellence in indoor climate management.
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