Bryant 551B, 551C installation instructions Adjust Factory-Installed Options

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Step 6 —Adjust Factory-Installed Options

Perfect Humidity™ Adaptive Dehumidification

System

Perfect Humidity system operation can be controlled by field installation of a Bryant-approved humidistat. (See Fig. 13.)

NOTE: A light commercial Thermidistat™ device (Fig. 14) can be used instead of the humidistat if desired. The Thermidistat device includes a thermostat and a humidistat. The humidistat is normally used in applications where a temperature sensor is already provided.

551B,C

% RELATIVE HUMIDITY

C06358

Fig. 13 ---Accessory Field-Installed Humidistat

C06359

Fig. 14 ---Light Commercial Thermidistat Device

To install the humidistat:

1.Route humidistat cable through hole provided in unit control box.

2.Some models may be equipped with a raceway built into the corner post on the left side of control box (See Fig. 12.) This raceway provides the required clearance between high-voltage and low voltage wiring. For models without a raceway, ensure to provide the NEC required clearance between high-voltage and low-voltage wiring.

3.Use a wire nut to connect humidistat cable into low- voltage wiring as shown in Fig. 15.

To install Thermidistat device:

1.Route Thermidistat cable through hole provided in unit control box.

2.Some models may be equipped with a raceway built into the corner post on the left side of control box (See Fig. 12.) This raceway provides the required clearance between high-voltage and low voltage wiring. For models without a raceway, ensure to provide the NEC required clearance between high-voltage and low-voltage wiring.

3.A field-supplied relay must be installed between the thermidistat and the Perfect Humidity circuit (recommended relay: HN61KK324). (See Fig. 16.) The relay coil is connected between the DEHUM output and C (common) of the unit. The relay controls the Perfect Humidity solenoid valve and must be wired between the Perfect Humidity fuse and the low-pressure switch. Refer to the installation instructions included with the Bryant Light Commercial Thermidistat device for more information.

Disconnect Switch

The optional disconnect switch is non-fused. The switch has the capability of being locked in place for safety purposes.

Manual Outdoor Damper

The outdoor-air hood and screen are attached to the basepan at the bottom of the unit for shipping.

Assembly:

1.Determine quantity of ventilation required for building. Record amount for use in Step 8.

2.Remove and save outdoor air opening panel and screws. (See Fig. 17.)

3.Remove evaporator coil access panel. Separate hood and screen from basepan by removing the 4 screws securing them. Save all screws.

4.Replace evaporator coil access panel.

5.Place hood on front of outdoor air opening panel. See Fig. 18 for hood details. Secure top of hood with the 4 screws removed in Step 3. (See Fig. 19.)

6.Remove and save 6 screws (3 on each side) from sides of the manual outdoor-air damper.

7.Align screw holes on hood with screw holes on side of manual outdoor-air damper. (See Fig. 18 and 19.) Secure hood with 6 screws from Step 6.

8.Adjust minimum position setting of the damper blade by adjusting the manual outdoor-air adjustment screws on the front of the damper blade. (See Fig. 17.) Slide blade vertically until it is in the appropriate position determined by Fig. 20. Tighten screws.

9.Remove and save screws currently on sides of hood. Insert screen. Secure screen to hood using the screws. (See Fig. 19.)

Convenience Outlet

An optional convenience outlet provides power for rooftop use. For maintenance personnel safety, the convenience outlet power is off when the unit disconnect is off. Adjacent unit outlets may be used for service tools.

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Contents Installation Instructions Field Fabricate Ductwork Install External Trap for Condensate DrainProvide Unit Support 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 Heat Anticipator Settings Field Power SupplyField Control Wiring 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 Temperature F Supply Air Temperature SAT SensorSupply Air Sensor Temperature Resistance Values 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 ControlMinimum Position Control Exhaust Set Point AdjustmentIndoor Air Quality IAQ Sensor Input Damper MovementOutside Air Temperature Changeover Set Points Return Air Temperature or Enthalpy Sensor Mounting LocationCO2 Sensor Configuration EconoMi$er IV ControlDehumidification of Fresh Air with DCV Control Adjust Evaporator-Fan SpeedCO2Sensor Standard Settings Belt Drive MotorsUnit Motor Pulley Turns Open Evaporator-Fan Motor Data Standard Motor Evaporator-Fan Motor Data High-Static Motors024, 036 060 74/84 072 Evaporator-Fan Motor EfficiencyMotor 551B Efficiency Airflow957 522 1000 598 173 718 267 Rpm Bhp Watts 900 566 142 690 228879 9031400 737 355 842 481 932 610 Rpm Bhp Watts 1200 666 252 778 361 873 476 956 5941300 701 809 418 902 540 983 665 875 551 962 6891700 866 478 966 608 Rpm Bhp Watts 1500 790 353 897 471 991 6001600 828 412 931 536 1022 670 1800 905 551 1001 6871495 1858 1700 1462 20671472 1761 1600 1463 1766 1520 1964 18002400 1145 1174 1223 1346 1296 1526 2200 1063 929 1147 1089 1224 1256 1295 14312300 1104 1046 1185 1212 1260 1386 2500 1185 1311 1262 14902000 984 727 1078 892 Rpm Bhp Watts 1800 907 558 1006 708 1092 8601900 945 638 1042 796 2100 1024 823 1115 9972300 1103 1044 1189 1234 1266 1425 2100 1024 823 1115 997 1195 1173 1268 13502200 1063 929 1152 1111 1230 1294 2400 1143 1168 1227 13671100 612 195 735 Rpm Bhp Watts 900 554 134 6811000 583 163 707 9191400 706 324 Rpm Bhp Watts 1200 643 233 762 3441300 674 276 1500 738 379719 Rpm Bhp Watts 1500 724 295 837 402 937 524 1028 6601600 757 343 866 455 962 580 1700 790 398 894 514 988 6431508 1957 1900 1474 1797 17001490 1873 1800 1467 1839 1527 2050 2000Rpm Bhp Watts 1500 1188 970 1261 1143 2400 1033 970 1115 1120 1192 1279 1264 14482500 1069 1084 1149 1239 1223 1403 1293 1576 1600 1208 1033 12792600 1097 1169 1181 1356 1257 1546 2400 1026 945 1115 1118 1195 1295 1268 14762500 1061 1053 1148 1233 1226 1416 1297 1604 2700 1132 1294 1214 1487 1289 1684Unit Preparation Internal WiringRefrigerant Service Ports Return-Air FiltersHeating Safety ReliefCooling Ventilation Continuous FanCleaning Evaporator CoilLubrication Refrigerant Charge Condenser-Fan AdjustmentEconoMi$er IV Adjustment 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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