Thermo Products OH6FA072DV4B, OH6FA072D48B Draft Regulators, Duct WORK/AIR Conditioning

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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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Contents OH6FA072DV4B OH6FA072DV4RSafety Section Table of Contents Section Beginning NON-COMBUSTIBLE Material II. General Instructions Read Before Start of InstallationCombustible Material From Rear FLUE/VENTSide Wall Venting Application Order Information Venting Rotation of Front Flue ElbowDraft Regulators Duct WORK/AIR ConditioningFilters Mounted External to Furnace Limit Position and Location Limit location for OH6FA072DBurner Installation Burner insertion illustration Top viewBurner Specifications and Applications OH6FA072D**BHeat Exchanger Cleaning Instructions Clean-out plug removalIII. Users Information Section Inspection AreasStarting the Burner Filter Cleaning and Location Location of the air filter on the typical highboy furnaceCustomer APPENDIX-A Replacement Parts List APPENDIX-B Wiring Diagrams
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OH6FA072D48R, OH6FA072DV4B, OH6FA072DV4R, OH6FA072D48B 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.

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