circulating blower remain energized. If the thermostat signals a requirement for second−stage heat (W2), the ignition control initiates high heat operation.

When a signal for second stage heat is received by the ignition control, the control energizes the second−stage gas valve and high−speed combustion air inducer until the demand is satisfied.

If a first−stage heat demand continues after the second−stage heat demand has been satisfied, the ignition control immediately de−energizes the second−stage gas valve. The combustion air inducer is held in high speed operation for an additional 1 second after the second−stage gas valve is de−energized. First−stage heat operation (first−stage gas valve and low−speed combustion air inducer) continues until heating demand is satisfied.

When the heating demand is satisfied, the control immediately de−energizes the gas valve. The combustion air inducer remains energized for a 30−second post−purge period. The circulating air blower operates for 90 seconds after the gas valve is de−energized.

Blower Delay − Heating

In the heating mode, the circulating air blower operation is

delayed for 30 seconds after the flame is established. The blower continues to operate for 90 seconds after the gas valve is de−energized.

NOTE − With the proper thermostat and subbase, continuous blower operation is possible by closing the R to G circuit.

Unit Controls

Blower Control (A54)

15GCSX units are equipped with a variable speed motor which is controlled by a blower control. Blower control settings and operation are given on page 12.

Ignition Control (A3)

The 15GCSX unit includes an ignition control which controls the combustion air inducer, gas valve and spark electrode. It receives signals from the main and auxiliary limit switches, the roll out switch, the pressure switch and the flame sensor. LED codes and flash rates are given on page 17. The ignition control is shown in figure 14.

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Lennox International Inc Gas Packaged Units Unit Controls, Blower Delay − Heating, Blower Control A54, Ignition Control A3
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Gas Packaged Units, 15GCSX specifications

Lennox International Inc. is a leading name in the HVAC industry, renowned for its innovative and energy-efficient products. Among its featured offerings are the 15GCSX Gas Packaged Units, specifically designed to provide reliable heating and cooling performance for residential and light commercial applications.

The 15GCSX models stand out with their impressive efficiency ratings, achieving up to 14 SEER (Seasonal Energy Efficiency Ratio) for cooling and 81% AFUE (Annual Fuel Utilization Efficiency) for heating. This ensures that users can enjoy a comfortable indoor environment while also managing energy costs, making them an environmentally friendly choice.

One of the key features of the 15GCSX is its compact design, allowing for easy installation in tight spaces. This is particularly beneficial for urban settings where space can be at a premium. The unit’s all-in-one design integrates both heating and cooling capabilities, eliminating the need for separate systems and simplifying maintenance.

The 15GCSX Gas Packaged Units utilize advanced technologies to optimize performance. Equipped with Lennox’s proprietary iComfort technology, these units can connect to smart thermostats, allowing users to monitor and adjust settings remotely. This innovation enhances energy savings and provides users with full control over their indoor climate, contributing to enhanced comfort levels.

In terms of durability, the 15GCSX models feature a robust construction, complete with weather-resistant cabinet materials designed to withstand the elements. The unit’s stainless steel heat exchanger is built for longevity and efficiency, further enhancing the overall reliability of the system.

Noise reduction is another critical consideration in the design of the 15GCSX units. They come equipped with a specially designed, quiet-running fan and compressor that help to minimize operational sound levels, ensuring a peaceful indoor environment during use.

In conclusion, the Lennox 15GCSX Gas Packaged Units represent a high-quality solution for efficient heating and cooling needs. With their combination of advanced technology, energy efficiency, compact design, and durability, these units are an excellent choice for homeowners and businesses seeking reliable climate control. The integration of smart features and silent operation further solidifies their position as a preferred option in the HVAC market.
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