Lennox International Inc 15GCSX, Gas Packaged Units installation instructions Blower Control A54

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Blower Control (A54)

BLOWER CONTROL (A54)

16−PIN PLUG

(BOARD TO MOTOR)

DIAGNOSTIC

LED

ADJUST

SELECTOR PINS

(Setting affects both heating and cooling modes)

HEATING SPEED SELECTOR PINS

COOLING SPEED SELECTOR PINS

Figure 12

!WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.

15GCSX units are equipped with a variable speed motor that is capable of maintaining a specified CFM throughout the external static range. A particular CFM can be obtained by positioning jumpers (COOL, HEAT, and ADJUST) on the blower control. The HEAT and COOL jumpers are labeled A, B, C and D. Each of the numbers corresponds with an air volume (CFM) setting. The ADJUST jumper is labeled Test, −, +, and Norm. The + and − pin settings are used to add or subtract a percentage of the CFM selected. The Test jumper is used to operate the motor in the test mode. See figure 12.

Factory settings for the blower speed jumpers are given in the wiring diagram in figure 11. Figure 12 shows the blower control. Use tables 4, 5 and 6 to determine the correct air volume for operation in heat and cool mode.

The CFM LED located on the blower control flashes one time per 100 cfm to indicate selected blower speed. For example, if the unit is operating at 1000 CFM, CFM LED will flash 10 times. If the CFM is 1150, CFM LED will flash 11 full times plus one fast or half flash.

At times the light may appear to flicker or glow. This takes place when the control is communicating with the motor between cycles. This is normal operation.

Read through the jumper settings section before adjusting the jumper to obtain the appropriate blower speed.

To change jumper positions, gently pull the jumper off the pins and place it on the desired set of pins. The following section outlines the different jumper selections available and conditions associated with each one. Refer to figure 12.

After the CFM for each application has been determined, the jumper settings must be adjusted to reflect those given in tables 4, 5 and 6. From the tables, determine which row most closely matches the desired CFM. Once a specific row has been chosen (+, NORMAL, or −), CFM volumes from other rows cannot be used. Below are descriptions of the jumper selections.

The variable speed motor slowly ramps up to and down from the selected air flow during both cooling and heating demand. This minimizes noise and eliminates the initial blast of air when the blower is initially energized.

ADJUST

The ADJUST pins allow the motor to run at normal speed, approximately 15 percent higher, or approximately 15 percent lower than normal speed. Tables 4, 5 and 6 give three rows (+, NORMAL, and −) with their respective CFM volumes. Notice that the normal adjustment setting for heat speed position C in table 4 is 900 CFM. The + adjustment setting for that position is 1035 CFM and for the − adjustment setting is 765 CFM. After the adjustment setting has been determined, choose the remaining speed settings from those offered in the table in that row.

The TEST pin is available to bypass the blower control and run the motor at approximately 70 percent to make sure that the motor is operational. This is used mainly in troubleshooting. The G terminal must be energized for the motor to run.

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Contents Table of Contents Retain These Instructions For Future Reference15GCSX Unit Dimensions − inches mm LbsShipping & Packing List Safety Information GeneralParts Arrangement Location Selection Service Clearances − Inches Millimeters Rigging & Setting UnitAccessory Lift Kit ClearancesExisting Common Vent Systems Vent Hood InstallationVent Hood Installation Page Typical Condensate Drain Condensate DrainFilters Removing Supply and Return Supply & Return Duct ConnectionsUnit Filter Size Air Opening CoversGas Supply and Piping Gas Piping and Electrical Conduit AccessCompressors Gas Heat Application DataIsolate Gas Valve To Pressure Test Drip Leg InstallationPressure Test Gas Piping Gas piping recommendationsElectrical 208/230 Line Voltage WiringHeat Anticipator Setting Thermostat15GCSX Series Gas Packaged Units Typical Wiring Diagram Blower Control A54 Blower Control A54Cool Cooling Start−Up Honeywell VR8205 Series Gas Valve Heating Start−UpNormal Operating Pressures High Altitude Information Checking and Adjusting Gas InputPost Start−up Check List Gas Heating Sequence of OperationBlower Control A54 Blower Delay − HeatingUnit Controls Ignition Control A3Ignition Control Pressure SwitchRollout Switch Ignition Control LED CodesSystem Operation Monitor Lsom Comfort Alert Code Auto−Reset FunctionCondenser Fan Clearances System Operation Monitor A132System Operation Monitor LED Troubleshooting Codes Maintenance Planned ServiceRepair Parts & Accessories
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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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