Lennox International Inc AIR HANDLERS, CBWMV Troubleshooting Heating Sequence of Operation

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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: Heating Sequence of Operation

CONDITIONS:

Power On

Normal Operation LED: Steady Flash

Thermostat (S1) Calls for Heat

YES

Fixed blower−ON delay (45−second) complete

NO

Check for 24 Volts Between W and C at A52 Terminal Strip

Blower Operates at the Heating Speed Selected by HEAT Jumper and ADJUST Jumper Positions on the BDC3 Control (A52)

YES

CFM Light on A52 Indicates Blower

Speed Selection with 100CFM / Blink

YES

Thermostat (S1) Demand Satisfied

YES

30 Second Blower Off Delay (Fixed) Complete

YES

Demand for Heat Satisfied

NO

Check for 24 Volts Between Pins 3 and 2 on J49

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Contents Introduction Table of ContentsShipping & Packing List Cbwmv Unit Dimensions − inches mm TOP ViewCbwmv Unit Optional Accessories GeneralCbwmv Unit Parts Arrangement Cbwmv Unit Parts DescriptionInstallation − Setting Equipment Cbwmv Unit Service ClearancesRequirements ApplicationReturn Air Plenum Duct SystemCbwmv Multi−Positional Unit Return Air Opening Guidelines Leveling Bolt Installation Removing the Bottom PanelHorizontal Applications Unit Suspended in Attic or CrawlspaceElectrical Filter Assembly & FiltersPlumbing Removeable Jumpers Electrostatic Discharge ESD Precautions And ProceduresField Wiring Application Jumper Settings See figure Accessory Field Wiring K212 Accessory Relay Field Wiring K212Accessory Field Wiring TB66 & TB67 Indoor Blower SpeedsTypical Cbwmv Wiring BDC3 Variable Blower Control Board Blower Speed AdjustmentsFreezestat Operation Jumper Settings Factory Blower Speed Tap SettingsCBWMV−24B−040 Blower Performance CBWMV−36B−070 Blower PerformanceCBWMV−36C−090 Blower Performance CBWMV−60C−100 Blower PerformanceAir Bleed Valve Location Initial Air PurgingCBWMV−60C−120 Blower Performance System Adjustments Annual ServiceService Filters 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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