Bryant 551B Condenser-Fan Adjustment, EconoMi$er IV Adjustment, Refrigerant Charge, No Charge

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Table 34—Perfect Humidity Adaptive Dehumidification System Sequence of Operation and

System Response — Single Compressor Unit (551C 024-060, 551B 036-072)

THERMOSTAT INPUT

ECONOMIZER FUNCTION

 

551B,C UNIT OPERATION

H

Y1

Y2

OAT. < Economizer Set Point

Economizer

Comp. 1

Subcooling Mode

Hot Gas Reheat Mode

Off

—

—

 

Normal Operation

 

On

On

On

No

Off

On

Yes

No

On

On

Off

No

Off

On

Yes

No

On

On

On

Yes

On

On

Yes

No

On

On

Off

Yes

On

On

No

Yes

On

Off

Off

No

Off

On

No

Yes

NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.

LEGEND

OAT --- Outdoor Air Temperature

551B,C

Step 3 —Condenser-Fan Adjustment

Shut off unit power supply. Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews. Adjust fan height as shown in Fig. 50. Tighten setscrews and replace condenser-fan assembly.

 

UNIT

FAN HEIGHT (in.) - A

 

 

024-060 and 072 (208/230 v)

2.75

 

 

072 (460 v)

3.50

 

 

 

 

 

C06138

Fig. 48 ---Condenser-Fan Adjustment

Step 4 —EconoMi$er IV Adjustment

Refer to Optional EconoMi$er IV section.

Step 5 —Refrigerant Charge

Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Refer to HVAC Servicing Procedures literature available at your local distributor and the following procedures.

Unit panels must be in place when unit is operating during charging procedure. Unit must operate a minimum of 10 minutes before checking or adjusting refrigerant charge.

No Charge

Use standard evacuating techniques. After evacuating system to 500 microns, weigh in the specified amount of refrigerant. (Refer to Table 1 and unit information plate.)

Low Charge Cooling

Using Cooling Charging Charts, Fig. 49-52, vary refrigerant until the conditions of the charts are met. Note the charging charts are different from type normally used. Charts are based on charging the units to the correct superheat for the various operating conditions. Accurate pressure gauge and temperature sensing device are required. Connect the pressure gauge 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. An accurate superheat, thermocouple-type or thermistor-type thermometer, and a gauge manifold are required when using the superheat 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.

C06139

Fig. 49 ---Cooling Charging Chart,

Standard 551B 036

Perfect Humidity™ System Charging

The system charge for units with the Perfect Humidity adaptive dehumidification system is greater than that of the standard unit alone. The charge for units with this option is indicated on the unit nameplate drawing. Also refer to Fig. 53-56. To charge systems using the Perfect Humidity adaptive 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 adaptive dehumidification system, charge per Fig. 53-56.

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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 551C Unit Operating Dimensions Weight551B 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 With Hood Attached Outdoor-Air Damper Position SettingEconoMi$er IV Component Locations Optional EconoMi$er Supply Air Temperature SAT Sensor Supply Air Sensor Temperature Resistance ValuesTemperature F Outdoor Air Lockout SensorEconoMi$er IV Sensor Usage EconoMi$er IV Control Modes Outdoor Dry Bulb ChangeoverDifferential 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$er IV TroubleshootingCooling Service Analysis EconoMi$er IV Troubleshooting CompletionProblem 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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