Bryant 551B II. Lubrication, III. CONDENSER-FAN Adjustment FIG, IV. BELT/PULLEY Adjustment

Page 42

Fig. 45 — Separating Coil Sections

C. Condensate Drain

Check and clean each year at start of cooling season. In win- ter, protect against freeze-up.

D. Filters

Clean or replace at start of each heating and cooling season, or more often if operating conditions require it. Replacement filters must be same dimensions as original filters.

E. Outdoor-Air Inlet Screen

Clean screen with steam or hot water and a mild detergent. Do not use throwaway filters in place of screens.

II. LUBRICATION

A. Compressors

Each compressor is charged with correct amount of oil from the factory.

B. Fan Motor Bearings

Fan motor bearings are permanently lubricated. No further lubrication of condenser-fan or evaporator-fan motors is required.

III.CONDENSER-FAN ADJUSTMENT (FIG. 46)

1.Shut off unit power supply and install lockout tag.

2.Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews.

3.Adjust fan height as shown in Fig. 46.

4.Tighten setscrews and replace condenser-fan assembly.

UNIT VOLTAGE

FAN HEIGHT “A” (in.)

208/230 v

2.75

460 v and 575 v

3.50

Fig. 46 — Condenser-Fan Adjustment

IV. BELT/PULLEY ADJUSTMENT

Inspect once each season or sooner if conditions warrant, verifying that belt tension and pulley alignment are correct. Replace belt if required.

V. ECONOMI$ER IV ADJUSTMENT

Refer to Optional EconoMi$er IV section on page 13.

VI. REFRIGERANT CHARGE

Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Refer to Bryant Standard Service Techniques Manual, Chapter 1, Refrigerants section.

Unit panels must be in place when unit is operating during charging procedure.

A. No Charge

Locate and repair any refrigerant leak. Use standard evacu- ating techniques. After evacuating system, weigh in the specified amount of refrigerant (refer to Table 1).

B. Low Charge Cooling

Use Cooling Charging Charts, Fig. 47-50. Vary refrigerant until the conditions of the appropriate chart are met. Note that charg- ing charts are different from the type normally used. Charts are based on charging the units to the correct superheat for the var- ious operating conditions. Accurate pressure gage and tempera- ture sensing device are required. Connect the pressure gage to the service port on the suction line. Mount the temperature sensing device on the suction line and insulate it so that outdoor ambient temperature does not affect the reading. Indoor-air cfm must be within the normal operating range of the unit.

C. Perfect Humidity™ System Charging

The system charge for units with the Perfect Humidity option is greater than that of the standard unit alone. The charge for units with this option is indicated on the unit nameplate draw- ing. Also refer to Fig. 51-53. To charge systems using the Perfect Humidity dehumidification system, fully evacuate, recover and recharge the system to the nameplate specified charge level.

To check or adjust refrigerant charge on systems using the Perfect Humidity Dehumidification system, charge per Fig. 51-53.

NOTE: When using the charging charts, it is important that only the subcooling/reheat dehumidification coil liquid line solenoid valve be energized. The subcooling/reheat dehumid- ification coil liquid line solenoid valve MUST be energized to use the charging charts and the outdoor motor speed control- ler jumpered to run the fan at full speed.

The charts reference a liquid pressure (psig) and tempera- ture at a point between the condenser coil and the subcooling/reheat dehumidification coil. A tap is provided on the unit to measure liquid pressure entering the subcooling/ reheat dehumidification coil.

IMPORTANT: The subcooling mode charging charts (Fig. 51-53) are to be used ONLY with units having the optional Perfect Humidity dehumidification system. DO NOT use standard charts (Fig. 47-50) for units with Perfect Humid- ity option, and DO NOT use Fig. 51-53 for standard units.

D. To Use Cooling Charging Charts, Standard Units

Take the outdoor ambient temperature and read the suction pressure gage. Refer to appropriate chart to determine what the suction temperature should be. If suction temperature is high, add refrigerant. If suction temperature is low, carefully recover some of the charge. Recheck the suction pressure as charge is adjusted.

EXAMPLE (Fig. 47): Circuit 1

Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 psig Suction Temperature should be . . . . . . . . . . . . . . . . . . 46 F (Suction Temperature may vary ±5° F.)

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Contents Installation ContentsSafety Considerations Provide Unit SupportIII. Install Condensate Drain Line and External Trap IV. RIG and Place UnitPositioning Roof Curb Details Weight OperatingBase Unit Dimensions Physical Data Unit 551BIFC Field Power SupplyMake Electrical Connections NECElectrical Data FLA MCA Mocp LRA HacrVoltage Comp no Electric Heater Electric Heater Usage †Used to determine minimum disconnect per NECVI. Adjust FACTORY-INSTALLED Options A. Disconnect Switch Field Control WiringHeat Anticipator Settings Perfect Humidity Dehumidification SystemAccessory Field-Installed Humidistat Convenience Outlet Manual Outdoor-Air DamperOptional EconoMi$er EconoMi$er IV Standard Sensors Hood Box RemovalOutdoor-Air Hood Construction EconoMi$er IV Control Modes EconoMi$er IV Sensor UsageEconoMi$er IV Controller Potentiometer LED Locations Enthalpy Changeover Set Points Page CO2 Sensor Standard Settings PpmMinimum Required Airflow Exceptions VII. Adjust EVAPORATOR-FAN SpeedUnit Heater Required Config UrationFan Rpm at Motor Pulley Setting* Standard Motor/Drive Fan Rpm at Motor Pulley Setting* High-Static Motor/DriveEvaporator-Fan Motor Data Standard Motor Evaporator-Fan Motor Data High-Static Motors Accessory/FIOP EconoMi$er IV Static Pressure* in. wgAccessory/FIOP Electric Heaters Static Pressure in. wg General FAN Performance NotesAirflow 901 703 1125 762 1365 832 690 1051 750 1285866 697 1088 756 1324 974 716 1204 774 1449866 489 386506 629 625 688 745 502 4241748 15671656 1844865 707 748 684 891 738 1034 789 1177805 695 953 749 1100 799 1249 760 1170 809 13231665 865 707 1018 760 1170 809 1323929 718 1086 771 1244 820 1401 1873683 1197 739 654 1040 713668 1116 726 697 1281 7531252 465 402596 629 802 694 1021 471 421944 695 1194 756 1453 823 674 1059 737 1306882 684 1125 746 1378 1009 705 1266 766 1533868 462 348467 614 594 681 728 474 3812293 996 2501 1038 2713 27162821 2930723 1577 710 14821677 808 1876 855 2081 1775 820 19781677 808 1876 1492 784 16831582 796 1777 1877628 997 685 614 929 673781 1445 791 1525PRE-START-UP Internal WiringVI. Refrigerant Service Ports START-UP Unit PreparationIX. Cooling Heating if Accessory Heater is InstalledXI. Safety Relief XII. Ventilation Continuous FANPerfect Humidity System Normal Design Cooling Operation Evaporator Coil Units With Power ExhaustService Cleaning Condenser CoilsECONOMI$ER IV Adjustment III. CONDENSER-FAN Adjustment FIGIV. BELT/PULLEY Adjustment II. LubricationCooling Charging Charts, Standard 551B090 Unit Cooling Charging Charts, Standard 551B120 Unit VII. Replacement Parts Troubleshooting Unit Troubleshooting Cooling TroubleshootingProblem Cause Remedy Will Not Energize Subcooling Mode Liquid ReheatReheat Mode Will Not Energize Low System CapacityII. ECONOMI$ER IV Troubleshooting Inputs Outputs EconoMi$er IV Troubleshooting CompletionEconoMi$er IV Input/Output Logic Demand Control EnthalpyOperating sequence Cooling EconoMi$er Heating IndexPage Preliminary Information START-UP ChecklistTemperatures III. START-UP Electrical
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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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