Causes

4, Action: Established flame fails

Response:

•Burner motor is de-energized and oil primary con- trol goes into recycle mode,

•If the fan off delay is longer than the recycle timing, the heat fan continues to run through the next trial for ignition.

5.Action: Limit Switch Opens Response:

•Oil primary control shut off the burner.

•Circulating fan is energized immediately at cool speed.

•A15 control board opens oil primary control T-3T connections,

•Circulating fan runs as long as limit stays open,

6, Action: Limit Switch Closes

Response: If there is a heat demand, A15 control board energizes oil primary control, initiating burner light off.

Burner failure or improper operation can result from a num- ber of different causes. Often the cause can be pinpointed by observing the different types of failure or by the process of elimination. The following troubleshooting charts list some failures, causes and a sequence of steps to isolate the point of failure. Check the simplest and most obvious items before progressing to other items.

Source

Thermostat

Safety

Overloads

Power

Thermostat

CAD Cell

Primary Control

Procedure

Check thermostat settings.

Check burner motor, primary safety control, & auxiliary limit switch.

Check furnace disconnect switch & main disconnect.

Touch jumper wire across thermostat terminals on

primary control. If burner starts, then fault is in the thermostat circuit.

Disconnect the flame detector wires at the

primary control. If the burner starts, fault is in the detector circuit.

Place trouble light between the black and white leads.

No light indicates that no power is going to the control.

Place trouble light between the orange and white leads. No light indicates faulty control.

Thermostat in OFF or

COOL

Thermostat is set too low

Burner motor overload tripped

Primary control tripped on safety

Auxiliary limit switch tripped on safety

Open switch

Blown fuse or tripped circuit breaker

Broken or loose thermostat wires

Loose thermostat screw connection

Dirty thermostat contacts

Thermostat not level

Faulty thermostat

Flame detector leads are shorted

Flame detector exposed to light

short circuit in the flame detector

Primary or auxiliary control switch is open

Open circuit between disconnect switch and limit control

Low line voltage or power failure

Defective internal control circuit

Correction

Switch to HEAT.

Turn thermostat to higher temperature.

Push reset button pump motor.

Reset primary control.

Reset auxiliary limit.

Close switch.

Replace fuse or reset circuit breaker.

Repair or replace wires.

Tighten connection.

Clean contacts.

Level thermostat.

Replace thermostat.

Separate leads.

Seal off false source of light.

Replace detector.

Check adjustment. Set the maximum setting.

Jumper terminals; if burner starts, switch is faulty, replace control.

Trace wiring and repair or replace it.

Call the power company.

Replace the control.

table continued on next page

Page 19

O23V SERIES

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.

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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.