BLOWER OFF DELAY ADJUSTMENT SWITCH

 

G

 

R

 

Y

TEST/TWIN

W

COM

 

24V

 

HUM

24V THERMOSTAT TERMINALS

HUMIDIFIER TERMINAL (24-VAC 0.5 AMP MAX)

LED OPERATION & STATUS LIGHT

SEC-1

3-AMP FUSE COOL

HEAT

HARNESS CONNECTOR

24V TRANSFORMER SEC-2

SPARE 1

BLOWER SPEED

SELECTION TERMINALS

SPARE 2 EAC 1 (BLACK)

 

EAC-ELECTRONIC AIR CLEANER

 

TERMINALS (115-VAC 1.0 AMP MAX)

115-VAC (L1)

EAC 2 (WHITE)

POWER

115-VAC (L2) NEUTRAL

SUPPLY

CONNECTION

 

HOT SURFACE

INDUCER MOTOR

IGNITER

CONNECTOR

CONNECTOR

 

 

A99258

 

Fig. 6ÐFurnace Control

The 24-v circuit contains an automotive-type, 3-amp fuse located on the control. (See Fig. 6.) Any shorts of the 24-v wiring during installation, service, or maintenance will cause this fuse to blow. If fuse replacement is required, use ONLY a 3-amp fuse. The control LED will display status code 24 when fuse needs to be replaced.

With power to the unit disconnected, check all electrical connec- tions for tightness. Tighten all screws on electrical connections. If any smoky or burned connections are found, disassemble the connection, clean all parts, strip wire, and reassemble properly and securely.

Reconnect electrical power to the unit and observe unit through 1 complete operating cycle. Electrical controls are difficult to check without proper instrumentation; if there are any discrepancies in the operating cycle, contact your dealer and request service.

The control in this furnace is equipped with an LED status light to aid in installation, servicing, and troubleshooting. It can be viewed through the sight glass or window on the blower access door. The control indicates status with the LED on continuously, rapid flashing, or a code composed of 2 digits. (The first digit is the number of short flashes, the second is the number of longs flashes.)

For an explanation of status codes, refer to service label located on blower access door, Fig. 8, or the troubleshooting guide.

The control stores 1 status code (the last status code to occur) for a period of 48 hr or until the 115- or 24-v power is interrupted.

NOTE: Look into blower access door sight glass for current LED status BEFORE removing the blower access door. Removing blower access door will open blower access door switch and terminate 115-v power to control, and status code will be erased.

1. To retrieve status code, proceed with the following:

NOTE: NO thermostat signal shall be present at control, and all blower off delays must be completed.

a.Leave 115-v power to furnace turned on.

b.Look into blower access door sight glass for current LED status.

NOTE: Leave blower access panel installed to maintain power to control to view current LED status.

c.Remove control access door.

d.BRIEFLY remove either wire from the main limit switch until LED goes out, then reconnect it.

NOTE: If wire to main limit is disconnected longer than 4 sec, main blower starts, and retrieval request is ignored.

2.When above items have been completed, the following will occur:

a.LED flashes a status code 4 times. Record this status code for further troubleshooting.

b.Inducer motor starts and continues to run the entire component test.

c.Hot surface ignitor is energized for 15 sec, then de- energized.

d.Main blower operates at heating speed for 10 sec, then turns off.

e.Main blower operates at cooling speed for 10 sec, then turns off.

f.Inducer motor stops.

Items a through e above will assist in furnace troubleshooting since all components are functionally operated except the gas valve. This procedure is also referred to as ªComponent Test.º

3.Operate furnace through 1 heat cycle to test for proper operation and check LED status.

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Bryant 393AAV instruction manual ÐFurnace Control, Ð6Ð

393AAV specifications

The Bryant 393AAV is a high-efficiency gas furnace designed to deliver reliable heating performance for residential applications. Crafted for homeowners seeking both comfort and energy savings, this model combines advanced technology with robust features to ensure optimal indoor climate control.

One of the standout characteristics of the Bryant 393AAV is its variable-speed ECM blower motor. This innovative motor allows for smooth and quiet operation while also enhancing energy efficiency. By adjusting its speed based on the heating demands of the home, the unit promotes consistent temperatures and improved airflow, ensuring that every room is evenly heated.

The furnace has an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96.5%, making it one of the most efficient options available. This high AFUE rating signifies that a significant portion of the fuel consumed is converted into usable heat, leading to reduced utility bills and a smaller carbon footprint. The 393AAV’s two-stage gas valve further contributes to its efficiency. By operating at a lower capacity during milder conditions and switching to a higher capacity when temperatures drop, this feature allows homeowners to enjoy a comfortable environment while minimizing energy consumption.

In terms of durability, the Bryant 393AAV is built to last. It features a corrosion-resistant heat exchanger constructed from premium materials to withstand the test of time. Additionally, the furnace is equipped with a reliable ignition system, ensuring safe and efficient startup with each heating cycle. The design includes an insulated cabinet that not only reduces noise levels but also improves energy efficiency by minimizing heat loss.

Installation and maintenance of the Bryant 393AAV are user-friendly. The unit has a compact design that makes it easier to fit into various spaces within the home. Regular maintenance is facilitated through access panels that allow technicians to reach key components with ease, promoting longevity and sustained performance.

In conclusion, the Bryant 393AAV is a modern gas furnace that excels in efficiency, comfort, and reliability. With features like a variable-speed blower motor, high AFUE ratings, and a robust design, homeowners can trust this unit to provide consistent heating while helping to reduce overall energy costs. This furnace is an excellent choice for those looking to invest in a heating solution that aligns with both comfort and sustainability goals.