XIII. Relief Devices, XIV. Control Circuit

B. High-Pressure and Low-Pressure Switches

If either switch trips, or if the compressor overtemperature switch activates, that refrigerant circuit will be automati- cally locked out by the CLO. To reset, manually move the thermostat setting.

C. Freeze Protection Thermostat (FPT)

An FPT is located on the top and bottom of the evaporator coil. They detect frost build-up and turn off the compressor, allowing the coil to clear. Once the frost has melted, the compressor can be reenergized by resetting the compressor lockout.

D. Evaporator Fan Motor Protection

A manual reset, calibrated trip, magnetic circuit breaker protects against overcurrent. Do not bypass connections or increase the size of the breaker to correct trouble. Determine the cause and correct it before resetting the breaker.

E. Condenser-Fan Motor Protection

Each condenser-fan motor is internally protected against overtemperature.

Fuses are also located in the control box and feed power to the condenser fan motors. Always replace blown fuses with the correct size fuse as indicated on the unit fuse label.

XIII. RELIEF DEVICES

All units have relief devices to protect against damage from excessive pressures (i.e., fire). These devices protect the high and low side.

XIV. CONTROL CIRCUIT, 24-V

Each control circuit is protected against overcurrent by a

3.2amp circuit breaker. Breaker can be reset. If it trips, determine cause of trouble before resetting. See Fig. 40-42 for wiring.

SEE DETAIL “C”

XV. REPLACEMENT PARTS

A complete list of replacement parts may be obtained from any Bryant distributor upon request.

XVI. DIAGNOSTIC LEDs

The IGC control board has a LED for diagnostic purposes. The IGC error codes are shown in Table 33.

Table 33 — IGC LED Indications

ERROR CODE	LED INDICATION
Normal Operation	On
Hardware Failure	Off
Fan On/Off Delay Modified	1 Flash
Limit Switch Fault	2 Flashes
Flame Sense Fault	3 Flashes
Five Consecutive Limit Switch Faults	4 Flashes
Ignition Lockout Fault	5 Flashes
Inducer Switch Fault	6 Flashes
Rollout Switch Fault	7 Flashes
Internal Control Fault	8 Flashes
Software Lockout	9 Flashes
LEGEND
IGC — Integrated Gas Unit Controller
LED — Light-Emitting Diode

NOTES:

1.There is a 3-second pause between error code displays.

2.If more than one error code exists, all applicable error codes will be displayed in numerical sequence.

3.Error codes on the IGC will be lost if power to the unit is interrupted.

Fig. 39 — Spark Gap Adjustment

—42—

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.

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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.