Gas Connection

When connecting gas supply, the length of the run from the meter must be considered in determining the pipe size. A line pressure of 7" w.c. (1.74 kPa) for natural gas should be maintained when sizing piping. A line pressure of 13” w.c. (3.23 kPa) should be maintained for liquefied petroleum (LP) gas. 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. For correct sizing of piping, refer to the (American) National Fuel Gas Code ANSI Z223.1 or (Canada) CSA-B149 Installation Code or consult the utility having jurisdiction.

A drip leg should be installed in the vertical pipe run to the unit. In some localities, codes may require that a manual main shutoff valve and union (furnished by installer) be installed external to the unit. Union must be of the ground joint type. A drip leg should be readily accessible to permit cleaning and emptying. See figure 9. Leave a minimum of 4" (102mm) clearance between electric box and drip leg.

A 1/8" NPT plugged tap shall be installed immediately upstream of the gas supply connection to the heater.

Leak Check

After gas piping is completed, carefully check all piping connections, (field and factory), for gas leaks. Use a soap solution or other preferred means.

CAUTION - DO NOT use matches, candles, flame or other sources of ignition to check for gas leaks.

IMPORTANT - The heater and its individual shut off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.45kPa).

The appliance must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve during any pressure testing of the gas supply system at test pressures equal to or less than 1/2 psig (3.45kPa). See figure 10.

NOTE - In case emergency shutdown is required, shut down main gas valve and disconnect main power to unit. These devices should be properly labeled by the installer.

GAS SUPPLY TO UNIT HEATER

NOTE - Compounds used on threaded joints of gas piping must be resistant to the actions of liquefied petroleum gases.

GAS SUPPLY CONNECTION

MANUAL

MAIN SHUT-OFF VALVE (Furnished by Installer)

GROUND

JOINT UNION

1/8 NPT

PLUGGED TAP

GAS FLOW

DRIP LEG

FIGURE 9

MANUAL MAIN SHUT-OFF VALVE WILL NOT HOLD NORMAL TEST PRESSURE

CAP

UNIT HEATER

FIGURE 10

ISOLATE GAS VALVE

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Lennox International Inc TUA100S, TUA125S Gas Connection, Leak Check, GAS Supply to Unit Heater GAS Supply Connection
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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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