Lennox International Inc TUA125S Limit Control, Louver Vane Adjustment, Flame Rollout Switch

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High Altitude
Units may be fired at full input up to 2000 ft. (610m) above sea level. Above 2000 ft. (610m), manifold pressure must be reduced by 4 percent for each 1000 feet above sea level or as specified by local authority having jurisdiction. Adjust pressure regulator to pressure shown in table 6 for natural gas and table 7 for LP/propane gas. The combustion air blower proving switch is factory set. No adjustment is necessary.
Gas Pressure
Check gas line pressure with unit firing at maximum rate. A minimum of 5.0" w.c. for natural gas or 10.4" w.c. for LP/propane gas should be maintained for proper unit operation. After line pressure has been checked and adjusted, check manifold pressure. Correct manifold pressure is shown on the unit rating plate. See figures 11, 12 and 13 for gas pressure adjustment screw location. A natural gas to LP/propane gas changeover kit is required to convert unit. Refer to installation instructions provided with changeover kit for conversion procedure.

ADJUSTMENTS

Limit Control

The limit control switch is factory set and not field adjustable.

Louver Vane Adjustment

Rotate louver vanes to direct airflow upward, downward, straight, or any combination of these directions.

Combustion Air Inducer Proving Switch

This combustion air inducer proving switch checks for proper combustion air inducer operation before allowing an ignition trial. The switch is factory set and no field adjustment is necessary.

Flame Rollout Switch

The flame rollout switch(es) on 45, 60 or 75 units are located on the burner box top, behind the ignition control board. The flame rollout switch on 100 or 125 units is located on the manifold bracket above the top burner. This normally closed switch opens on a temperature rise. Check for adequate combustion air and proper venting before manually resetting switch.

TABLE 6

NATURAL GAS MANIFOLD PRESSURES - in.wg. (kPa)

ALTITUDE FT. (M)

MODEL

0-2000

2001-3000

3001-4000

4001-5000

5001-6000

6001-7000

7001-8000

8001-9000

9001-10000

(0-610)

(610-914)

(915-1219)

(1220-1524)

(1524-1829)

(1829-2134)

(2134-2438)

(2439-2743)

(2744-3048)

 

TUA045SN

3.5 (0.87)*

2.7 (0.67)

2.5 (0.62)

2.2 (0.55)

2.0 (0.50)

1.8 (0.45)

1.6 (0.40)

1.4 (0.35)

1.3 (0.32)

TUA060SN

3.5 (0.87)*

2.7 (0.67)

2.5 (0.62)

2.2 (0.55)

2.0 (0.50)

1.8 (0.45)

1.6 (0.40)

1.4 (0.35)

1.3 (0.32)

TUA075SN

3.5 (0.87)*

2.7 (0.67)

2.5 (0.62)

2.2 (0.55)

2.0 (0.50)

1.8 (0.45)

1.6 (0.40)

1.4 (0.35)

1.3 (0.32)

TUA100SN

3.5 (0.87)*

2.7 (0.67)

2.5 (0.62)

2.2 (0.55)

2.0 (0.50)

1.8 (0.45)

1.6 (0.40)

1.4 (0.35)

1.3 (0.32)

TUA125SN

3.5 (0.87)*

2.7 (0.67)

2.5 (0.62)

2.2 (0.55)

2.0 (0.50)

1.8 (0.45)

1.6 (0.40)

1.4 (0.35)

1.3 (0.32)

*No adjustment required.

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Contents Table Of Contents TUA*SN,LA,SF45, 60, and 75 Unit Dimensions 125 Unit Dimensions Unit ClearancesShipping Requirements CSA in the USARequirements CSA in Canada Unit Heater Installation Combustion and Ventilation AirVenting and Combustion Air Inlet Vent and AIR Intake Termination on Single Wall Vent Horizontal Venting GeneralHorizontal Venting-Commercial Recommendations Requirements Condensate Drain Through TEE Pipe and Drain LoopGeneral Recommendations and Requirements. In areasCondensate Drain Through Vent Termination Horizontal Venting Residential Installation Vertical Vent RequirementsHorizontal Venting-Residential Two Pipes Horizontal Vent RequirementsHorizontal Venting Concentric Vent Installation Horizontal Venting Concentric Kit ResidentialRemoval Of Unit From Common Vent Line Voltage Field Wiring Electrical ConnectionsGas Connection Leak CheckGAS Supply to Unit Heater GAS Supply Connection Unit Start-Up Operation for Honeywell VR8205 Series Gas Valve FigureTo light the burners manually White Rodgers 36E GAS ValveRobertshaw 2000DER GAS Valve Attempt to light the burners manuallyIgnition Control LED To Turn Off Gas To UnitHeating Sequence of Operation Optional Gas Conversion KitFlame Rollout Switch Louver Vane AdjustmentCombustion Air Inducer Proving Switch Limit ControlGas Flow LP/PROPANE GAS Manifold Pressures in.wg. kPaGas Flow Rate Ft.3/Hr Flue Passageway and Flue Box Repair PartsBurners 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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