Bryant Legacy 677C**C Series Installation Instructions Manual Download Page 17

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When the air temperature at the limit switch drops to the
low--temperature setting of the limit switch, the switch closes and

completes the control circuit. The direct--spark ignition system
cycles and the unit returns to normal heating operation.

Table 5 – LED Indications

STATUS CODE

LED INDICATION

Normal Operation

No Power Hardware Failure

Off

Check fuse, low voltage circuit

1 Flash

Limit Switch Fault

2 Flashes

Flame Sense Fault

3 Flashes

Four Consecutive Limit Switch Faults

4 Flashes

Ignition Lockout Fault

5 Flashes

Pressure Switch Fault

6 Flashes

Rollout Switch Fault

7 Flashes

Internal Control Fault

8 Flashes

Temporary 1 hr auto reset

9 Flashes

NOTES:

1.This code indicates an internal processor fault that will reset itself in one

hr. Fault can be caused by stray RF signals in the structure or nearby. This

is a UL requirement.

2. LED indicates acceptable operation. Do not change ignition control

board.

3. When W is energized the burners will remain on for a minimum of 60 sec.

4. If more than one error mode exists they will be displayed on the LED in

sequence.

Rollout Switch

The function of the rollout switch is to close the main gas valve in
the event of flame rollout. The switch is located above the main

burners. When the temperature at the rollout switch reaches the
maximum allowable temperature, the control circuit trips, closing

the gas valve and stopping gas flow to the burners. The indoor

(evaporator) fan motor (IFM) and induced draft motor continue to
run until switch is reset. The IGC LED will display FAULT CODE

Step 4 — Start--up Cooling and Make Adjust-

ments

Complete the required procedures given in the Pre--Start--Up

section before starting the unit. Do not jumper any safety devices

when operating the unit. Do not operate the compressor when the
outdoor temperature is below 40



F (4.4



C) (unless accessory

low--ambient kit is installed). Do not rapid--cycle the compressor.
Allow 5 minutes between on cycles to prevent compressor damage.

Checking Cooling Control Operation

Start and check the unit for proper cooling control operation as

follows:

1. Place room thermostat SYSTEM switch in OFF position.

Observe that blower motor starts when FAN switch is
placed in ON position and shuts down when FAN switch is
placed in AUTO position.

2. Place SYSTEM switch in COOL position and FAN switch

in AUTO position. Set cooling control below room

temperature. Observe that compressor, condenser fan, and
evaporator blower motors start. Observe that cooling cycle

shuts down when control setting is satisfied. The evaporator
fan will continue to run for 90 sec.

IMPORTANT

Three--phase, scroll compressors units are

direction oriented. Unit must be checked to ensure proper
compressor 3--phase power lead orientation. If not corrected within
5 minutes, the internal protector will shut off the compressor. The
3--phase power leads to the unit must be reversed to correct
rotation. When turning backwards, the difference between
compressor suction and discharge pressures will be near zero.

Checking and Adjusting Refrigerant Charge

The refrigerant system is fully charged with Puron

(R--410A)

refrigerant and is tested and factory sealed. Allow system to operate
a minimum of 15 minutes before checking or adjusting charge.

EXPLOSION HAZARD

Failure to follow this warning could

result in death, serious personal injury,

and/or property damage.
Never use air or gases containing

oxygen for leak testing or operating

refrigerant compressors. Pressurized

mixtures of air or gases containing

oxygen can lead to an explosion.

WARNING

NOTE

: Adjustment of the refrigerant charge is not required unless

the unit is suspected of not having the proper Puron

(R--410A)

charge.

NOTE

Some units have fixed orifice refrigerant metering

devices. There is a different charging procedure for both expansion
devices. Refer to the correct procedure for your unit.
The charging label and the tables shown refer to system

temperatures and pressures in cooling mode only. A refrigerant
charging label is attached to the inside of the compressor access

panel. (See Fig. 17 Subcool chart for units with TXV and
superheat chart for units with fixed orifice.) The chart includes the

required liquid line temperature at given discharge line pressures
and outdoor ambient temperatures.
A superheat chart is attached to the inside of the compressor access

panel for the unit with fixed metering device. Refer to the charging
procedure on the label.
An accurate thermocouple-- or thermistor--type thermometer, and a
gauge manifold are required when using the subcooling charging

method for evaluating the unit charge. Do not use mercury or small

dial--type thermometers because they are not adequate for this type
of measurement.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit damage.
When evaluating the refrigerant charge, an indicated

adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an

abnormal condition exists somewhere in the cooling system,
such as insufficient airflow across either coil or both coils.

CAUTION

Proceed as follows:

1. Remove caps from low-- and high--pressure service fittings.
2. Using hoses with valve core depressors, attach low-- and

high--pressure gauge hoses to low-- and high--pressure
service fittings, respectively.

3. Start unit in Cooling Mode and let unit run until system

pressures stabilize.