blower and blower motor have been selected to work successfully against the following range of duct system resistance.

Recommended range of duct system resistance for all models: 0.2 to 0.5 in. W. G. external static pressure.

Due to the need to maintain an adequate supply of combustion and ventilation air, the furnace shall not be installed in small room without return air duct system. A duct the full size of the furnace return aid opening shall extend to a location outside the furnace room.

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

NOTICE: Return air grilles and supply registers in the air distribution system should never be obstructed.

The duct system shall be designed for the maximum CFM requirements of the installation whether it is for heating of cooling. Two common rules are as follows: 1.) 400 CFM/ton cooling 2.) 14 CFM/1000 BTU’S heating for 550-850Temp. Rise. The most common location for the A-shaped coil (A style) is shown in Fig. 5.

Fig-5: Furnace with coil cabinet

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.

E. Air Filter Mounted External to Furnace:

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

The filter rack provided with the furnace, refer to Fig. 6, can 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, (3) locator knockouts have been placed at the proper locations on both the left and right side casings. Cut the opening to the O. D. of the knock-outs.

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Thermo Products PHCFA072DV4R operation manual Air Filter Mounted External to Furnace
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PHCFA072DV4R specifications

The Thermo Products PHCFA072DV4R is a cutting-edge heating and cooling solution designed for modern residential and light commercial applications. This unit stands out due to its efficient performance and advanced technology. One of the most remarkable features of the PHCFA072DV4R is its energy efficiency. It boasts a high SEER rating that ensures reduced energy consumption without sacrificing comfort, making it an environmentally friendly choice for homeowners.

This system utilizes an inverter-driven compressor, which allows for variable speed operation. This means that the unit can adjust its output to match the specific heating or cooling needs of a space, providing more consistent temperatures and enhanced comfort. Additionally, this inverter technology minimizes noise levels, making the PHCFA072DV4R a quieter option compared to traditional fixed-speed systems.

Another noteworthy characteristic of the PHCFA072DV4R is its advanced filtration system. It is equipped with high-efficiency filters that effectively capture dust, pollen, and other airborne particles, ensuring improved indoor air quality. For those who suffer from allergies or have respiratory issues, this feature can provide significant relief.

The unit offers a user-friendly interface with a smart thermostat that enables users to control the system remotely. Through a mobile app, homeowners can adjust settings, set schedules, and monitor energy usage from anywhere, which adds a layer of convenience to the overall user experience.

Additionally, the PHCFA072DV4R is built with durability in mind. Its robust construction and high-quality materials ensure long-term reliability, reducing the likelihood of costly repairs. It also comes with a warranty that reflects the manufacturer's confidence in the product's performance.

Overall, the Thermo Products PHCFA072DV4R encapsulates efficiency, comfort, and advanced technology in a single package. Its ability to adapt to varying conditions, combined with features focused on air quality and ease of use, make it a prime choice for anyone looking for a versatile heating and cooling solution. This unit not only meets the demands of today's consumers but also aligns with sustainable practices, making it an ideal addition to any home or business.
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