a.With the oil shut off, remove the 1/8 in. NPT threaded pipe plug located on the lower rear side of the oil pump, refer to Figure 22. Attach a pressure gage, capable of measuring pressure in pounds per square inch gage, PSIG, in this opening, on the discharge side, of the oil pump.

NOTICE: It may be necessary to remove the oil pump to attach the plumbing required to connect a pressure gage to the pump.

b.Turn on the fuel oil and cause the appliance to activate the heating section by answering a “call for heat”.

NOTICE: It may be necessary to bleed air from the oil line before the burner can be fired.

c.Allow the heating section to operate for 10 to 15 minutes.

d.Note the oil pressure at the pump.

e.To adjust the pressure, use a common screwdriver to turn in the pressure adjustment screw, located on the upper front of the oil pump body.

f.Allow the fuel flow rate to stabilize for a moment. Recheck the oil pressure.

g.If required, repeat the oil pressure adjustment again.

h.When the input rate adjustment has been completed, shut off the fuel oil to the appliance. Remove the pressure gage. Reinstall the pipe plug using a thread compound resistant to the action of LP gases and fuel oil.

To insure the combustion air supply is adequate, it is now necessary to repeat the steps in the previous Initial Burner Adjustment section of this manual.

4. Setting Supply Air Temperature Rise:

: To avoid injury from moving parts or electrical shock, shut off the power to the appliance before removing supply air blower compartment door and servicing this appliance.

All OH6 & OH8 models are designed and wired at the factory for a blower speed during heating that should result in an approximate temperature rise of 65°F. The temperature rise through the heating section, for any given blower speed, may vary depending on a number of factors. A few of these factors are variations in, the actual resistance of the duct system to airflow at any time, the return air temperatures, and the fuel oil heating value.

Also, fouling of the heat exchanger surfaces will reduce temperature rise. In general, a lower temperature rise through the heating section will result in higher heating efficiency.

Temperature rise = supply air temperature - return air temperature.

After 15 to 20 minutes of continuous operation, the temperature rise through the furnace must fall within a range of 50° to 80° F. If the outlet or supply duct temperature is too high, check to make sure the return air filter is clean, the return air registers are free from obstruction, the outlet registers are properly adjusted and clear, and the supply and return air ducts are open. The circulating air blower is not moving enough air if the supply air temperature is still too high. Before proceeding further, turn off the power supply to the appliance and remove the vestibule cover. The speed of the blower must be increased by changing the switch setting on the control board, please refer to Figure 18.

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Thermo Products OH8FA119DV5R, OH8FA119D60R, OH6FA072D48N, OH6FA072DV4N, OH6FX072DV4R, OH8FA119DV5B, OH8FA119D60B operation manual
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OH8FA119D60B, OH8FA119DV5B, OH6FX072DV4R, OH6FA072DV4N, OH6FA072D48N specifications

Thermo Products has established a reputation for delivering high-quality heating solutions tailored for various applications. Among their standout offerings are the OH8FA119DV5R, OH8FA119D60R, OH6FA072D48B, OH6FA072D48N, and OH6FA072DV4N models. These units are engineered with precision and incorporate advanced technologies to deliver reliable performance in residential and commercial settings.

One of the main features of these models is their energy efficiency. They utilize modern heat exchanger designs, which allow for maximum heat transfer while minimizing energy consumption. This not only helps in reducing utility bills but also supports sustainable practices by lowering the carbon footprint. Many systems are also equipped with variable-speed motors, providing precise airflow control, which enhances comfort while operating quietly.

In addition to their energy efficiency, these units incorporate smart technology that allows for seamless integration into home automation systems. This feature enables users to monitor and control their heating systems remotely through mobile apps, making it convenient to adjust settings for optimal comfort. The smart thermostats associated with these models often feature learning capabilities, which adapt to users' habits to optimize heating schedules further.

Durability is another standout characteristic of the OH8FA and OH6FA series. Built with robust materials, these heaters are designed to withstand the rigors of daily use. Many units come with extended warranties, reflecting the manufacturer's confidence in their longevity. Furthermore, corrosion-resistant components ensure that the units maintain their performance over time, even in challenging environments.

Safety is also a key consideration in these products. Equipped with multiple safety features, including overheat protection and flame sensors, users can rest assured their heating systems operate without risk. Additionally, these models often include advanced diagnostics, making troubleshooting easier and enhancing user experience.

In summary, Thermo Products' OH8FA119DV5R, OH8FA119D60R, OH6FA072D48B, OH6FA072D48N, and OH6FA072DV4N represent a blend of efficiency, technology, durability, and safety in heating solutions. Whether for a cozy home or a large commercial space, these models offer versatile options to meet diverse heating needs while prioritizing energy conservation and user convenience. As the demand for efficient heating continues to rise, Thermo Products remains a leader in providing innovative solutions that cater to modern heating requirements.
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