SourceProcedure

Burner Motor Motor does not come up to speed and trips out on overload. Turn off power and rotate blower wheel by hand to check for binding or excessive drag.

Causes

Correction

 

Low line voltage

Check voltage

at power source.

 

Correct cause of voltage drop or the

 

call power company.

Pump or blower overloading motor

Correct

cause

of overloading.

Faulty motor

Replace

motor.

 

Source

Poor Fire

Flame Detector

Procedure

After burner fires,

immediately jumper across flame detector terminals at

the primary control.

If burner continues to run, this may be due to poor fire. Inspect fire.

If fire is good, fault is in the flame detector.

Check detector circuit.

Causes

Unbalanced fire

Too much air - -lean short fire

Too little air - - long dirty fire

Excessive draft

Too little draft or restriction

Dirty cad cell face

Faulty cad cell - exceeds 15000 hms Loose or defective cad cell wires

Correction

Replace nozzle

Reduce combustion air - check combustion.

Increase combustion air - check combustion.

Adjust barometric damper for correct draft.

Correct draft or remove restriction.

Clean cad cell face.

Replace cad cell.

Secure connections or replace cad cell holder and wire leads.

Primary Control olf burner locks out on

safety, fault is in the pri- mary control.

SourceProcedure

Thermostat Check thermostat.

Limit Control Connect voltmeter between line voltage connections to primary control (black & white leads). If burner cycles due to power interruption, it is cycling on limit.

Primary control circuit defective

Causes

Heat anticipator set too low

Vibration at thermostat

Thermostat in the path of a warm air draft

Dirty furnace air filters

Blower running too slow

Blower motor seized or burned out

Blower bearings seized

Blower wheel dirty

Blower wheel in backward

Wrong motor rotation

Restrictions in return or supply air system

Adjustable limit control set too low

Replace primary control.

Correction

Correct heat anticipator setting.

Correct source of vibration.

Shield thermostat from draft or relocate.

Clean or replace filter.

Increase blower speed to maintain proper temp. rise.

Check for high static pressure.

Check HEAT selector pin per wiring diagram (figure 18, page 16).

Replace motor.

Replace bearings and shaft.

Clean blower wheel.

Reverse blower wheel.

Replace with properly rotating wheel.

Correct cause of restriction.

Reset limit to maximum stop setting.

table continued on next page

Page 21

O23V SERIES

Page 21
Image 21
Lennox International Inc O23V-120, O23V5-140, O23V5-154, O23V-70, O23V4-120, O23V-105 SourceProcedure, Causes Correction

O23V2-90, O23V-90, O23V4-105, O23V5-154, O23V3-70 specifications

Lennox International Inc. is a leading provider of innovative climate control solutions, widely recognized for its high-quality heating, ventilation, and air conditioning (HVAC) systems. Among its varied product line, the O23 series exemplifies Lennox's commitment to energy efficiency, performance, and user-friendly technology.

The O23V2-90, O23V3-120, O23V3-90, O23V4-105, and O23V2-70 are advanced models of the O23 series, designed specifically for residential settings. Each model offers unique specifications tailored to meet diverse customer needs.

These units are equipped with cutting-edge inverter technology, which allows for precise control of air temperature and flow. By adjusting the compressor speed, these systems optimize energy consumption while maintaining comfort. This variable-speed operation minimizes energy waste and significantly reduces utility bills, a key advantage for homeowners seeking efficient solutions.

The O23V3-120 stands out for its high cooling and heating capacities, making it ideal for larger homes or commercial spaces. Meanwhile, the O23V2-70 model is designed for smaller applications, ensuring that even modest-sized spaces can benefit from Lennox quality. Each model also features robust insulation and construction, enhancing durability and performance over time.

Incorporating smart technology, these units come with Wi-Fi connectivity, empowering users to manage their home’s temperature remotely through a smartphone app. The integration with smart home systems further enhances the user experience, providing convenience and efficiency right at your fingertips.

Quiet operation is another hallmark of the O23 series. Each model is engineered to reduce sound levels, ensuring that comfort does not compromise peace within the home.

Additionally, these units are designed with environmentally-friendly refrigerants, aligning with global sustainability efforts. This focus on eco-conscious technology not only adheres to regulatory standards but also appeals to environmentally-aware consumers.

Overall, Lennox O23 series models showcase a blend of advanced technology, efficient performance, and user-friendly features, embodying the brand’s commitment to excellence in climate control solutions. For homeowners and businesses alike, investing in these models translates to greater comfort, cost savings, and a reduced ecological footprint.