Bryant 551B Unit Preparation, Return-Air Filters, Outdoor-Air Inlet Screens, Compressor Mounting

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551B,C

PRE-START-UP

!WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD

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

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

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

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

4.Relieve all pressure from the system before touching or disturbing anything inside the terminal box if a refrigerant leak is suspected around the compressor terminals. Use accepted methods to recover the refrigerant.

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

6.Do not use a torch to remove any component. The system contains oil and refrigerant under pressure. To remove a component, wear protective goggles and proceed as follows:

a.Shut off electrical power to the unit and tag disconnect.

b.Recover refrigerant to relieve all pressure from the system using both high-pressure and low-pressure ports.

c.Cut component connection tubing with a tubing cutter, and remove the component

from the unit.

d.Carefully unsweat the remaining tubing stubs when necessary. Oil can ignite when exposed to a torch flame.

Proceed as follows to inspect and prepare the unit for initial start-up:

1.Remove all access panels.

2.Read and follow instructions on all 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, or 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, halide torch, or liquid-soap solution.

c.Inspect all field-wiring and factory-wiring connections. Be sure that connections are completed and tight. Be sure that wires are not in contact with refrigerant tubing or sharp edges.

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

4.Verify the following conditions:

a.Make sure that condenser-fan blade are correctly positioned in fan orifice. See Condenser-Fan Adjustment section for more details.

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

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

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

START-UP

Unit Preparation

Make sure that the unit has been installed in accordance with installation instructions and applicable codes.

Return-Air Filters

Make sure the correct filters are installed in the unit (See Table 1). Do not operate the unit without return-air filters.

Outdoor-Air Inlet Screens

Outdoor-air inlet screen(s) must be in place before operating the unit.

Compressor Mounting

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

Internal Wiring

Check all electrical connections in unit control boxes; tighten them as required.

Refrigerant Service Ports

Each unit system has 4 Schrader-type service ports: one on the suction line, one on the liquid line, and 2 on the compressor discharge line. Be sure that caps on the ports are tight.

High Flow Valves

Two high flow refrigerant valves are located on the hot gas tube coming out of the compressor and the suction tubes. Large black plastic caps distinguish these valves with O-rings located inside the caps. No field access to these valves is available at this time. Ensure the plastic caps are in place and tight or the possibility of refrigerant leakage could occur.

Compressor Rotation

On 3-phase units be certain that the compressor is rotating in the proper direction. To determine whether or not compressor is rotating in the proper direction:

1.Connect the service gauges to suction and discharge pressure fittings.

2.Energize the compressor.

3.The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

1.Note that the indoor fan (060 and 072 three-phase units only) is probably also rotating in the wrong direction.

2.Turn off power to the unit and tag disconnect.

3.Reverse any two of the unit power leads.

4.Turn on power to the unit and energize the compressor.

The suction and discharge pressure levels should now move to their normal start-up levels.

NOTE: When the compressor is rotating in the wrong direction, the unit makes more noise and does not provide cooling.

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Contents Installation Instructions Install External Trap for Condensate Drain Provide Unit SupportField Fabricate Ductwork Rig and Place UnitRoof Curb Details Unit Leveling Tolerances Unit Operating Dimensions Weight 551C551B 551B 036-072 Base Unit Dimensions 551C 024-060 Base Unit Dimensions Field Power Supply Field Control WiringHeat Anticipator Settings Make Electrical ConnectionsPhysical Data 551B Base Unit 551BPhysical Data 551C Base Unit 551CPower Wiring Connections Electrical Data-551C FLA MCA LRA Type OutletPerf ect Voltage FLA Crheater 008,009 23.4 30.1 40.8 Electrical Data-551B FLA MCA LRA414 508 Ton 004+005 19.9 24.3 55.2 76.3 86.9 168 34.9 173 002 13.6 A00 or Adjust Factory-Installed Options Typical Perfect Humidity t Adaptive Dehumidification System Outdoor-Air Damper Position Setting Outdoor-Air Damper With Hood AttachedEconoMi$er IV Component Locations Optional EconoMi$er Supply Air Temperature SAT Sensor Supply Air Sensor Temperature Resistance ValuesTemperature F Outdoor Air Lockout SensorEconoMi$er IV Control Modes Outdoor Dry Bulb Changeover EconoMi$er IV Sensor UsageDifferential Dry Bulb Control Outdoor Enthalpy Changeover Differential Enthalphy ControlExhaust Set Point Adjustment Indoor Air Quality IAQ Sensor InputMinimum Position Control Damper MovementOutside Air Temperature Changeover Set Points Return Air Temperature or Enthalpy Sensor Mounting LocationCO2 Sensor Configuration EconoMi$er IV ControlAdjust Evaporator-Fan Speed CO2Sensor Standard SettingsDehumidification of Fresh Air with DCV Control Belt Drive MotorsUnit Motor Pulley Turns Open Evaporator-Fan Motor Data Standard Motor Evaporator-Fan Motor Data High-Static MotorsEvaporator-Fan Motor Efficiency Motor 551B Efficiency024, 036 060 74/84 072 AirflowRpm Bhp Watts 900 566 142 690 228 879957 522 1000 598 173 718 267 903Rpm Bhp Watts 1200 666 252 778 361 873 476 956 594 1300 701 809 418 902 540 983 6651400 737 355 842 481 932 610 875 551 962 689Rpm Bhp Watts 1500 790 353 897 471 991 600 1600 828 412 931 536 1022 6701700 866 478 966 608 1800 905 551 1001 6871462 2067 1472 1761 16001495 1858 1700 1463 1766 1520 1964 18002200 1063 929 1147 1089 1224 1256 1295 1431 2300 1104 1046 1185 1212 1260 13862400 1145 1174 1223 1346 1296 1526 2500 1185 1311 1262 1490Rpm Bhp Watts 1800 907 558 1006 708 1092 860 1900 945 638 1042 7962000 984 727 1078 892 2100 1024 823 1115 9972100 1024 823 1115 997 1195 1173 1268 1350 2200 1063 929 1152 1111 1230 12942300 1103 1044 1189 1234 1266 1425 2400 1143 1168 1227 1367Rpm Bhp Watts 900 554 134 681 1000 583 163 7071100 612 195 735 919Rpm Bhp Watts 1200 643 233 762 344 1300 674 2761400 706 324 1500 738 379Rpm Bhp Watts 1500 724 295 837 402 937 524 1028 660 1600 757 343 866 455 962 580719 1700 790 398 894 514 988 6431474 1797 1700 1490 1873 18001508 1957 1900 1467 1839 1527 2050 20002400 1033 970 1115 1120 1192 1279 1264 1448 2500 1069 1084 1149 1239 1223 1403 1293 1576Rpm Bhp Watts 1500 1188 970 1261 1143 1600 1208 1033 12792400 1026 945 1115 1118 1195 1295 1268 1476 2500 1061 1053 1148 1233 1226 1416 1297 16042600 1097 1169 1181 1356 1257 1546 2700 1132 1294 1214 1487 1289 1684Internal Wiring Refrigerant Service PortsUnit Preparation Return-Air FiltersSafety Relief CoolingHeating Ventilation Continuous FanCleaning Evaporator CoilLubrication Condenser-Fan Adjustment EconoMi$er IV AdjustmentRefrigerant Charge No ChargeCooling Charging Chart Standard 551B Replacement Parts 551C 3 TON Charging Chart 551C 5 TON Charging Chart Unit Troubleshooting Economi$er IV TroubleshootingEconoMi$er IV Troubleshooting Completion Cooling Service AnalysisProblem Cause Remedy EconoMi$er IV Input/Output Logic Inputs OutputsEconoMi$er IV Functional View Preliminary Information Catalog No. II551B---C---36---1
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551C, 551B specifications

The Bryant 551B and 551C are two highly efficient air conditioning units designed to provide optimal comfort in residential settings. Known for their reliability and performance, these models are part of Bryant's esteemed line of heating and cooling solutions.

One of the standout features of the Bryant 551B is its two-stage cooling system, which allows for better humidity control and increased comfort. This ensures that homeowners can enjoy consistent temperatures while reducing energy consumption. The unit operates quietly, thanks to its noise-reducing technology, making it an ideal choice for bedrooms and living spaces.

On the other hand, the Bryant 551C builds upon this foundation with its variable-speed compressor. This technology allows the unit to adjust its cooling output according to the specific needs of the home. This results in seamless operation and even greater energy efficiency. Both models also incorporate Bryant's advanced control capabilities, which allow users to monitor and adjust settings remotely via smart devices, adding a layer of convenience and modernity to home climate control.

With an emphasis on durability, both the 551B and 551C feature a galvanized steel cabinet that protects against weather-related damage. The powder coat finish further enhances their resistance to rust and corrosion, ensuring a long lifespan and minimal maintenance.

Another significant characteristic of these units is their excellent Seasonal Energy Efficiency Ratio (SEER) ratings. The 551B boasts a SEER rating of up to 16, while the 551C takes it even further with ratings exceeding 20. This efficiency not only translates to lower energy bills for homeowners but also contributes to a reduced carbon footprint, making these units environmentally friendly options.

Both models are also designed to operate with eco-friendly refrigerants, aligning with modern energy standards and regulations aimed at reducing greenhouse gas emissions.

In summary, the Bryant 551B and 551C are exemplary choices for homeowners looking for reliable, efficient, and high-performing air conditioning solutions. With features such as two-stage and variable-speed compressors, advanced smart technology, and robust construction, these models stand out in the competitive HVAC market. They promise a comfortable indoor environment along with significant energy savings, making them a wise investment for the future.
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