All installations and services must be performed by qualified service personnel.

B. DRAFT REGULATORS:

A draft regulator is supplied with the furnace and should be installed according to the regulator manufacturers recommendations. With the burner operating, use a draft gauge to adjust the regulator to the proper setting. (refer to the instructions enclosed with draft regulator to adjust to the proper setting). When the burner air supply and draft are properly adjusted, the overfire draft should be a negative (-).01" to (-).02" WC 1, as measured at the 5/16" overfire air tap (See Fig. 8). This tap is provided in the upper burner mounting plate. To measure the flue draft, punch a small hole in the vent connector pipe as close to the furnace as possible and always before the draft regulator.

Note: 1. Draft overfire may be positive for high fire applications but not to exceed (+).02" WC.

C. DUCT WORK/AIR CONDITIONING:

If the furnace is used in connection with summer air conditioning (cooling), the furnace should be installed parallel with or on the upstream side of the evaporator coil to avoid condensation in the furnace heat exchanger. If the cooling unit is installed with a parallel flow arrangement, dampers or other means used to control flow of air should be provided to prevent chilled air from entering the furnace. If such a damper is manually operated, it must be equipped with a means to prevent operation of either unit, unless the damper is in the full heat or cool position.

The duct system should again follow the current design standard of Air Conditioning Contractors of America (ACCA) or ASHRAE Fundamentals volume.The most common location for the A-shaped coil (A style) is shown in Fig. 2.

Fig 2: Acceptable locations for the air conditioner evaporator coil.

NOTICE: The minimum coil pan clearance for a sectional or drum type heat exchanger is three inches unless specified otherwise by the individual coil manufacturer.

D. FILTERS MOUNTED EXTERNAL TO FURNACE

On highboy furnaces, it is necessary to cut the return air opening in the side or rear casing, depending upon the needs of the specific installation.

The filter rack provided with the furnace, refer to Fig. 5, will serve as a template to scribe a mark for the return air opening on the casing. Place the filter rack on a side casing approximately one inch up from the bottom of the furnace and centered from side to side. Place the securing flange against the casing when locating the return air opening. For your convenience, (4) locator knock-outs have been placed at the proper locations on both the left and right side casings.

PLEASE NOTE: While scribing the return air opening, the filter rack can be held in position by tape or similar temporary means.

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Thermo Products OH65FA072D48B Draft Regulators, Duct WORK/AIR Conditioning, Filters Mounted External to Furnace
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OH65FA072D48R, OH65FA072D48B, OH65FA072DV4B, OH65FA072DV4R specifications

The Thermo Products OH65FA072DV4B, OH65FA072D48B, OH65FA072D48R, and OH65FA072DV4R series represent a significant advancement in the realm of heating and cooling systems. Designed for efficiency and reliability, these models are engineered to meet the diverse needs of residential and commercial applications.

One of the standout features across these models is their energy efficiency. Utilizing advanced heat pump technology, these units offer optimal heating and cooling performance while minimizing energy consumption. This is particularly beneficial in today’s environmentally conscious market, where reducing energy usage not only lowers utility bills but also lessens the overall carbon footprint.

The OH65FA series incorporates a variable-speed compressor, which plays a critical role in enhancing system performance. This technology allows the units to adjust their output according to the heating or cooling demand. As a result, the system operates more quietly and with greater energy efficiency, maintaining a comfortable indoor climate without unnecessary energy expenditure.

Another notable characteristic of these models is their robust construction. Built with high-quality materials, they are designed to withstand various environmental conditions, ensuring reliability and longevity. The units are also equipped with corrosion-resistant coatings, which provide additional durability, especially in coastal or humid areas.

Additionally, the OH65FA series features a user-friendly interface, allowing for easy temperature adjustments and programmable settings. Homeowners can customize their heating and cooling schedules, which not only provides comfort but also contributes to further energy savings.

In terms of installation, these units are designed with flexibility in mind. They can be easily integrated into existing systems or installed as standalone units. Their compact design means they occupy minimal space while still delivering powerful performance.

Finally, safety features are paramount in the design of the OH65FA series. Each unit includes built-in safeguards such as over-temperature protection and system diagnostics, ensuring safe operation at all times. This focus on safety, combined with advanced technology and energy efficiency, makes the Thermo Products OH65FA072DV4B, OH65FA072D48B, OH65FA072D48R, and OH65FA072DV4R series an ideal choice for anyone seeking reliable and efficient climate control solutions.
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