15. The L37 and L39 blower must be assembled (the L33 blower is pre-assembled) and then installed into unit.

(See Fig. 3 for L33 or Fig. 4 & 5 for L37 and L39). Assemble legs to blower with (4) 5/16-18 X 5/8 hex head self tapping machine screws, (4 per side).

16.The motor (3/4 HP for L37 or 1HP for L-39) must be mounted to the motor mounting plate then mounted to the mounting plate support angles on the furnace base, (Refer to Fig. 4).

Notice: The motor provided is a dual voltage 230/115V motor. Ensure motor is wired for your application.

17.Install filter rack (12) into clips on rear side casings and rear separator making certain rack engages all clips on separator and side casings. (See Fig. 1).

18.Install one trim ring with gasket (20) over flue on inside of top rear panel then install top rear panel (18) with the other trim ring (20) on outside of the top rear panel. (See Fig.1)

19.Set rear bottom panel (16), access door (17), top rear panel (18) and top rear section (19) in place. Align factory drilled holes and metal screw panels in place. Assemble door handles on door. Make certain door can be readily removed and replaced. (See Fig. 1).

20.Install top front section (13) and top front panel (14) then fasten with hex head sheet metal screws.

(See Fig. 1).

21.Assemble door handles on door and install front access door (15). Make certain door can be readily removed and replaced. (See Fig. 1).

22.Fasten the external wire harness to the right side casing of the furnace in the pre punched holes provided. Use the machine screws and nuts provided to fasten the 4 X 4 junction box with the attached 60" greenfield (for fan & limit switch) to the front of the right side casing. Fasten the remaining box to the rear of the right side casing in the pre punched holes with the screws provided. Fasten the shortest piece of greenfield with the straight connector through the side casing into the rear box. The 90° connector is then used to connect to the blower motor. Fasten the remaining mid sized greenfield through the front junction box. The free end of this greenfield piece is to attach to the burner motor. Consult the oil service manual for wiring schematics to wire the external harness.

23.After properly positioning the chamber for burner insertion depth, (face of burner head recessed ¼ inch back from inside chamber wall) carefully place loose fill insulation in front of chamber to above burner tube.

24.Follow instructions in the furnace installation manual for burner installation and burner set-up.

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Thermo Products L33-37-39 manual
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L33-37-39 specifications

Thermo Products L33-37-39 stands out as a top-notch line of heating and cooling solutions designed for both residential and commercial applications. This series is renowned for its advanced technologies that not only enhance performance but also promote energy efficiency, ensuring that users can enjoy temperature control without incurring hefty energy bills.

At the heart of the L33-37-39 series is the cutting-edge inverter technology that enables the units to adjust their cooling or heating output according to the specific requirements of the space. This leads to a significant reduction in energy consumption while maintaining a consistent and comfortable indoor environment. The inverter technology allows the system to operate at varying speeds rather than simply on or off, thus minimizing energy wastage and enhancing comfort levels.

One of the main features of the L33-37-39 series is its eco-friendly refrigerant, which is compliant with the latest environmental regulations. By utilizing this refrigerant, the units not only meet stringent environmental standards but also help in reducing the overall carbon footprint. This makes them a responsible choice for environmentally conscious consumers.

The design of the L33-37-39 units incorporates a user-friendly interface that simplifies operation and maintenance. With programmable settings, users can easily adjust the temperature to suit their preferences throughout different times of the day, achieving optimal comfort. Furthermore, many units in this series come with smart technology capabilities, allowing for remote control via smartphone applications. This feature empowers users to manage their heating and cooling systems conveniently, whether at home or away.

In terms of durability, the L33-37-39 units are constructed using high-quality materials that ensure longevity and resilience. The outdoor units are designed to withstand harsh weather conditions, while the indoor components are built for efficient airflow and low noise operation, providing a serene indoor environment.

Overall, Thermo Products L33-37-39 offers a comprehensive solution embodying efficiency, comfort, and eco-friendliness, making them ideal for anyone looking to enhance their indoor climate control systems. With their innovative technology and user-centric design, these units are equipped to meet a variety of heating and cooling needs, catering to both residential and commercial users.
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