3.Secure lower filter retainer and long section of filter support bracket to unit. See Fig. 22. Leave screws loose on 180 and 240 units.

4.Slide baffle (sizes 180 and 240) behind lower filter retainer and tighten screws.

5.Loosen sheet metal screws for top panel of base unit- located above outdoor-air inlet opening, and remove screws for hood side panels located on the sides of the outdoor-air inlet opening.

6.Match notches in hood top panel with unit top panel screws. Insert hood flange between top panel flange and unit. Tighten screws.

7.Hold hood side panel flanges flat against unit, and install screws removed in Step 5.

Fig. 21 — Seal Strip Location

BAFFLE (180 AND 240 SIZES ONLY)

LOWER FILTER

RETAINER

FILTER SUPPORT

BRACKET

HOOD SIDE

PANELS (2)

HOOD TOP PANEL

BAFFLE

(180 AND

240

ONLY)

LOWER

FILTER

RETAINER

FILTER SUPPORT

BRACKET

HOOD DRAIN PAN

UPPER FILTER RETAINER

NOTE: The outdoor air hood comes with a baffle which is used on sizes 180 and 240 only. Discard baffle for size 155 units.

Fig. 22 — Outdoor-Air Hood Details

8.Insert outdoor-air inlet screens and spacer in channel created by lower filter retainer and filter support bracket.

9.Attach remaining short section of filter support bracket.

A.Enthalpy Control Installation

NOTE: The accessory outdoor-air enthalpy sensor must be installed BEFORE the economizer hoods are installed on the unit or hoods will have to be removed.

1.Remove and discard the factory-installed jumper assembly containing the 800-ohm resistor on the

economizer control module (between terminals SR and +). See Fig. 18.

2.Remove black wire assembly containing the 620-ohm resistor from between economizer control module ter-

minal SO and the outdoor-air thermostat (OAT). Place this wire assembly (containing the 620-ohm resistor)

between economizer control module terminals SR and +, replacing the jumper removed in Step 1. See Fig. 18.

3.Disconnect the blue wire from the OAT.

4.Remove OAT from the outside of the economizer. See Fig. 17.

5.Mount the enthalpy sensor (Fig. 23) to the econo- mizer on the outside of the unit (in the same location from which the OAT was removed) using the 2 screws provided. See Fig. 17.

6.Reconnect the blue wire removed in Step 3 to the enthalpy sensor terminal +.

7.Cut the violet wire provided to desired length and terminate with quick-connect terminal provided. Route the violet wire from the enthalpy sensor termi- nal S, through the snap bushing, and to the econo- mizer control module terminal SO. See Fig. 18.

8.Set changeover set point to the desired location. See Fig. 24.

NOTE: For maximum benefit of outdoor air, set the enthalpy control to the “A” setting. At this setting, when the relative humidity is 50% and the outdoor air is below 74 F, the relay contacts on the sensor will be closed.

9. Reinstall economizer hoods if removed.

IMPORTANT: Be sure all seal strips and RTV sealant are intact. A watertight seal to inside of unit must be maintained.

Fig. 23 — Outdoor-Air and Return-Air

Enthalpy Sensor

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Bryant 581A operation manual Seal Strip Location, Enthalpy Control Installation
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581A specifications

The Bryant 581A is a pivotal model in the realm of heating, ventilation, and air conditioning (HVAC) systems, known for its robust performance and energy efficiency. As part of the Bryant product lineup, the 581A offers a blend of innovative technologies combined with reliable engineering, making it a suitable choice for both residential and light commercial applications.

One of the standout features of the Bryant 581A is its outstanding energy efficiency. With a Seasonal Energy Efficiency Ratio (SEER) rating of up to 16, this model meets Energy Star qualifications, ensuring that homeowners can enjoy lower utility bills while helping to reduce their environmental footprint. The efficiency is further enhanced by the unit’s environmentally friendly refrigerant, which not only improves performance but also aligns with modern sustainability standards.

Another key characteristic of the Bryant 581A is its durable construction. Designed to withstand various weather conditions, the unit features a robust cabinet that protects internal components. This durability not only prolongs the lifespan of the system but also minimizes the need for frequent maintenance or repairs. The coil design is optimized for heat transfer efficiency, enhancing the unit's overall performance in both cooling and heating modes.

In terms of technology, the Bryant 581A incorporates advanced control systems that enable precise temperature regulation. The multi-stage cooling capabilities ensure that the system can adapt to varying temperature demands, providing comfort in all seasons. Additionally, the model is compatible with smart thermostats, allowing homeowners to control their HVAC system remotely via smartphone or other connected devices.

Noise reduction is another aspect where the Bryant 581A excels. Equipped with a variable-speed compressor and sound-dampening features, this model operates quietly, minimizing disruption in residential or office environments. This focus on acoustic comfort makes it an ideal choice for those who value a peaceful living or working space.

Overall, the Bryant 581A represents an excellent balance of efficiency, durability, and modern technology. With features aimed at enhancing user comfort and reducing operational costs, it stands out as a reliable solution in the competitive HVAC market. Whether for new installations or replacements, the Bryant 581A is a testament to the brand’s commitment to quality and innovation in home climate control.
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