Lennox International Inc TUA100S Burners, Flue Passageway and Flue Box, Combustion Air Blower

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SERVICE

CAUTION - Turn off gas and electrical power to unit before performing any maintenance or service operations on this unit. Remember to follow lighting instructions when putting unit back into operation after service or maintenance.

Burners

1- Periodically examine burner flames for proper appearance during the heating season.

2- Before each heating season examine the burners for any deposits or blockage that may have occurred.

3- Clean burners as follows:

a-Turn off both electrical and gas supplies to unit. b-Disconnect gas supply piping, high tension and sensor leads. Remove gas manifold. Remove burner tray.

c-Clean burners as necessary. Make sure that burner heads line up properly to ensure flame crossover. Check spark gap on electrode and adjust if required. The gap should be between 0.110 inch and 0.140 inch (2.79mm to 3.56mm). The gap may be checked with appropriately sized twist drills or feeler gauges.

d-Reinstall burner tray, gas manifold, high tension and sensor leads. Reconnect gas supply piping. e-Restore electrical power and gas supply. Follow lighting instructions to light unit. Check burner flame.

Flue Passageway and Flue Box

The flue passages and flue box should be inspected and cleaned prior to each heating season. The sequence of operation should be as follows:

1- Turn off both electrical and gas supply to unit.

2- Disconnect combustion air blower wiring.

3- Remove screws securing flue box to unit. Remove flue box. If necessary, remove blower assembly from flue box. Clean flue box with wire brush.

4- Remove turbulator retention bracket and turbulators. Clean turbulators with wire brush.

5- Remove burners as described in section “Burners" section.

6- Clean tubes with a wire brush.

7- Reassemble unit. The combustion air and flue box gaskets should also be replaced during reassembly.

8- Restore electrical power and gas supply. Follow lighting instructions to light unit. Check operation of unit.

Combustion Air Blower

Under normal operating conditions, the combustion air blower should be checked and cleaned prior to the heating season with the power supply disconnected. Use a small brush to clean blower wheel.

Electrical

1- Check all wiring for loose connections.

2- Check for correct voltage at unit (unit operating). 3- Check amperage draw.

Flue and Air Inlet

Check all vent and air inlet joints for tightness. Ensure that connections are sealed and that there are no blockages.

Failure to Operate

If unit fails to operate check the following: 1- Is thermostat calling for heat?

2- Is main disconnect closed?

3- Is there a breaker tripped or a fuse blown?

4- Is gas turned on at meter?

5- Is manual shutoff valve open?

6- Is unit ignition system in lock out? If unit locks out again, call service technician to inspect unit.

7- Is combustion air inducer proving switch closed? Obstructed flue will cause unit to shut off at combustion air inducer proving switch. Check flue passage and outlet.

Repair Parts

When ordering repair parts include the complete unit model number listed on the unit rating plate. For example: TUA045SNAF1.

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Contents Table Of Contents TUA*SN,LA,SF45, 60, and 75 Unit Dimensions 125 Unit Dimensions Unit ClearancesRequirements CSA in Canada ShippingRequirements CSA in the USA Unit Heater Installation Combustion and Ventilation AirVenting and Combustion Air Inlet Horizontal Venting-Commercial Vent and AIR Intake Termination on Single Wall VentHorizontal Venting General Condensate Drain Through TEE Pipe and Drain Loop GeneralRecommendations Requirements Recommendations and Requirements. In areasCondensate Drain Through Vent Termination Horizontal Venting Residential Installation Vertical Vent RequirementsHorizontal Venting-Residential Two Pipes Horizontal Vent RequirementsRemoval Of Unit From Common Vent Horizontal Venting Concentric Vent InstallationHorizontal Venting Concentric Kit Residential Line Voltage Field Wiring Electrical ConnectionsGAS Supply to Unit Heater GAS Supply Connection Gas ConnectionLeak Check Unit Start-Up Operation for Honeywell VR8205 Series Gas Valve FigureWhite Rodgers 36E GAS Valve Robertshaw 2000DER GAS ValveTo light the burners manually Attempt to light the burners manuallyTo Turn Off Gas To Unit Heating Sequence of OperationIgnition Control LED Optional Gas Conversion KitLouver Vane Adjustment Combustion Air Inducer Proving SwitchFlame Rollout Switch Limit ControlGas Flow Rate Ft.3/Hr Gas FlowLP/PROPANE GAS Manifold Pressures in.wg. kPa Repair Parts BurnersFlue Passageway and Flue Box Combustion Air BlowerTUA45/60/75/100/125SN,LA,SF

TUA45S, T-CLASS TM SEPARATED COMBUSTION UNIT HEATERS, TUA75S, TUA100S, TUA60S specifications

Lennox International Inc. stands out as a leader in the heating and cooling industry, and its T-Class™ Separated Combustion Unit Heaters, including models such as TUA60S, TUA100S, TUA125S, and TUA45S, epitomize innovation and efficiency. These unit heaters are engineered to provide reliable warmth in commercial and industrial environments, ensuring comfort and productivity even in the coldest conditions.

One of the most significant features of the T-Class™ heaters is their separated combustion design. This technology allows the heater to draw air for combustion from outside the building, which means that interior air remains untouched and is not used for heating. This design not only improves indoor air quality but also enhances energy efficiency by minimizing heat loss.

The TUA60S, with a heating capacity of 60,000 BTUs, is ideal for smaller spaces, while the TUA100S provides a robust 100,000 BTUs, making it suitable for medium-sized areas. For larger installations, the TUA125S delivers a powerful 125,000 BTUs, ensuring even the most expansive environments remain comfortably warm. Lastly, the TUA45S is perfect for smaller facilities or specific zones requiring efficient heating solutions.

These heaters are equipped with advanced technology such as modulating burners that adjust the heat output based on the current temperature needs, leading to energy savings and reduced operational costs. The T-Class™ units are designed with reliable components, ensuring longevity and reducing maintenance requirements. Additionally, the exterior reflects a modern and durable finish, ensuring they withstand the rigors of industrial settings.

Installation is straightforward thanks to their flexible configurations, allowing for both vertical and horizontal venting options. This adaptability makes them suitable for various applications, from warehouses to manufacturing plants.

In terms of safety, Lennox emphasizes top-tier mechanisms, including built-in safety limits and high-temperature shutoff features to prevent overheating. Furthermore, their models are compliant with industry regulations, reflecting Lennox International's commitment to safety and environmental stewardship.

In conclusion, Lennox International Inc.’s T-Class™ Separated Combustion Unit Heaters, including the TUA60S, TUA100S, TUA125S, and TUA45S, offer a blend of efficiency, reliability, and advanced technology. These heaters are suitable for a variety of commercial and industrial applications, ensuring optimal comfort while prioritizing safety and energy savings.
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