Bryant 577D----A Pre-Start-Up, Unit Start-Upand Troubleshooting, A. LED Description, 577D-- --A

577D-- -- A

PRE-START-UP

!WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK AND ENVIRONMENTAL HAZARD

Failure to follow this warning could result in personal injury or death and/or property damage.

1.Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system.

2.Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured.

3.Do not remove compressor terminal cover until all electrical sources are disconnected and tagged.

4.Relieve and recover all refrigerant from system before touching or disturbing anything inside terminal box if refrigerant leak is suspected around compressor terminals.

5.Never attempt to repair soldered connection while refrigerant system is under pressure.

6.Do not use torch to remove any component. System contains oil and refrigerant under pressure.

7.To remove a component, wear protective goggles and proceed as follows:

a.Shut off gas supply to unit.

b.Shut off electrical power to unit and install lockout tag.

c.Relieve and reclaim all refrigerant from system using both high- and low-pressure ports.

d.Cut component connecting tubing with tubing cutter and remove component from unit.

e.Carefully unsweat remaining tubing stubs when necessary. Oil can ignite when exposed to flame.

Use the Start-Up Checklist supplied at the end of this book and proceed as follows to inspect and prepare the unit for initial start-up:

1.Remove all access panels. (See Fig. 24.)

2.Read and follow instructions on all DANGER, WARNING, CAUTION, and INFORMATION labels attached to, or shipped with unit.

3.Make the following inspections:

a.Inspect for shipping and handling damages, such as broken lines, loose parts, disconnected wires, etc.

b.Inspect for oil at all refrigerant tubing connections and on unit base. Detecting oil generally indicates a refrigerant leak. Leak test all refrigerant tubing connections using electronic leak detector, or liquid-soap solution. If a refrigerant leak is detected, see following Check for Refrigerant Leaks section.

c.Inspect all field- and factory-wiring connections. Be sure that connections are completed and tight.

d.Ensure wires do not touch refrigerant tubing or sharp sheet metal edges.

e.Inspect coil fins. If damaged during shipping and handling, carefully straighten fins with a fin comb.

4.Verify the following conditions:

a.Make sure gas line is free of air. Before lighting the unit for the first time, perform the following tasks with the gas valve in the OFF position.

NOTE: If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended that the ground

joint union be loosened, and the supply line be allowed to purge until the odor of gas is detected. Never purge gas lines into a combustion chamber. Immediately upon detection of gas odor, retighten the union. Allow 5 minutes to elapse, then light unit.

b.Make sure that condenser-fan blade is correctly positioned in fan orifice. Top 1/3 of condenser fan blade should be within fan orifice venturi.

c.Ensure fan hub is positioned correctly with respect to motor housing (See Fig. 27).

d.Make sure that air filter(s) is in place.

e.Make sure that condensate drain trap is filled with water to ensure proper drainage.

f.Make sure that all tools and miscellaneous loose parts have been removed.

5.Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.

6.Each unit system has two Schrader-type ports, one low-side Schrader fitting located on the suction line, and one high-side Schrader fitting located on the compressor discharge line. Be sure that caps on the ports are tight.

START-UP

Unit Start-Up and Troubleshooting

NOTE: Always check high- and low-voltage supply to the unit components. Check the integrity of the plug receptacle connections and unit wiring harness prior to assuming a component failure.

A. LED Description

LEDs built into Evolution control boards provide installer or service person information concerning operation and/or fault condition of the unit controls and ECM motor. This information is also available at the system UI in text with basic troubleshooting instructions. Careful use of information displayed will reduce the need for extensive manual troubleshooting.

Both the furnace and heat pump (HP)/air conditioner (AC) boards have an amber LED and a green LED. On the HP/AC board, these are located near the System Communications connector (ABCD) (lower right corner of the HP/AC board as installed in the unit). On the furnace board, these are located at the upper right side, adjacent to the fuse, above the terminal block. The amber LED is the System Status LED, labeled STATUS. The green LED, labeled COMM, is used as an indicator of system communications status (See Fig. 15 and 18).

Status Codes will be displayed on the STATUS LED using the following protocol:

1.The number of short flashes indicates first digit of code.

2.The number of long flashes indicates second digit of code.

3.A short flash is 0.25 seconds on. A long flash is 1 second on.

4.The time between flashes is 0.25 seconds.

5.The time between last short flash and first long flash is 1 second.

6.The LEDs will be off for 2.5 seconds before repeating code.

7.If multiple status codes are active concurrently, the highest priority status code is displayed.

B.Control Start-Up and System Communications Troubleshooting

On power up, green COMM LEDs will be turned off until successful system communications are established (this should happen within 10 seconds). Once communications with UI are successful, both COMM LEDs will be lit and held on. At the same time, amber STATUS LEDs will be lit and held continuously on until a request for operating mode is received. The STATUS LED will be on any time unit is in idle mode.

If, at any time, communications are not successful for a period exceeding 2 minutes, the Evolution control will only allow

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