Bryant 551B Units With Power Exhaust, Service Cleaning, Evaporator Coil, Condenser Coils

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Table 29 — Perfect Humidity™ Dehumidification System Sequence of Operation

and System Response — Dual Compressor Units

THERMOSTAT

ECONOMIZER FUNCTION

 

 

551B UNIT OPERATION

 

 

 

 

INPUT

 

 

First Stage

 

 

Second Stage

 

 

 

 

 

 

 

 

 

H

Y1

Y2

OAT < Economizer

Economizer

Compressor

Subcooling

Hot Gas

Compressor

Subcooling

 

Hot Gas

 

 

 

Set Point

 

1

Mode

Reheat Mode

2

Mode

 

Reheat Mode

Off

—

—

 

 

Unit Operates Under Normal Sequence of Operation

 

 

 

On

On

On

No

Off

On

Yes

No

On

Yes

 

No

On

On

Off

No

Off

On

Yes

No

On

No

 

Yes

On

On

On

Yes

On

On

Yes

No

On

No

 

Yes

On

On

Off

Yes

On

On

No

Yes

On

No

 

Yes

On

Off

Off

No

Off

On

No

Yes

On

No

 

Yes

 

LEGEND

 

 

 

 

 

 

 

 

 

OAT

— Outdoor Air Temperature

 

 

 

 

 

 

 

 

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

 

 

 

 

 

F. Units With Power Exhaust

When the outdoor-air damper is modulated open, the two end switches located in the actuator are tripped. The factory settings are: switch no. 1 will close at 30% outdoor air; switch no. 2 will close at 70% outdoor-air. Both switches are field adjustable. As the outdoor-air damper opens, switch no. 1 closes, energizing a double-pole relay that starts fan no. 1. As the outdoor-air damper continues to open, switch no. 2 will close, energizing a double-pole relay that starts fan no.

2.When the outdoor-air damper closes to a point below the fan start points (30% fan no. 1, 70% fan no. 2), the respective fan will be deenergized.

SERVICE

CAUTION: When servicing unit, shut off all elec- trical power to unit to avoid shock hazard or injury from rotating parts.

I. CLEANING

Inspect unit interior at the beginning of each heating and cooling season or as operating conditions require.

A. Evaporator Coil

1.Turn unit power off and install lockout tag. Remove evaporator coil access panel.

2.If EconoMi$er IV or accessory two-position damper is installed, remove economizer or two-position damper by disconnecting EconoMi$er IV plug and removing mounting screws.

3.Slide filters out of unit.

4.Clean coil using a commercial coil cleaner or dish- washer detergent in a pressurized spray canister. Wash both sides of coil and flush with clean water. For best results, back-flush toward return-air section to remove foreign material.

5.Flush condensate pan after completion.

6.Reinstall economizer or two-position damper and filters.

7.Reconnect wiring.

8.Replace access panels.

B. Condenser Coils

Inspect coils monthly. Clean condenser coils annually, and as required by location and outdoor-air conditions.

Clean 2-row coils as follows:

1.Turn off unit power and install lockout tag.

2.Remove top panel screws on condenser end of unit.

3.Remove condenser coil corner post. See Fig. 43. To hold top panel open, place coil corner post between top panel and center post. See Fig. 44.

4.Remove device holding coil sections together at return end of condenser coil. Carefully separate the outer coil section 3 to 4 in. from the inner coil section. See Fig. 45.

5.Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner.

6.Secure the sections together. Reposition the coil sec- tions, and remove the coil corner post from between the top panel and center post. Install the coil corner post and coil center post, and replace all screws.

Fig. 43 — Cleaning Condenser Coil

Fig. 44 — Propping Up Top Panel

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Contents Safety Considerations ContentsInstallation Provide Unit SupportPositioning III. Install Condensate Drain Line and External TrapIV. RIG and Place Unit Roof Curb Details Operating WeightBase Unit Dimensions Unit 551B Physical DataMake Electrical Connections Field Power SupplyIFC NECFLA MCA Mocp LRA Hacr Electrical DataVoltage Comp no Electric Heater †Used to determine minimum disconnect per NEC Electric Heater UsageHeat Anticipator Settings Field Control WiringVI. Adjust FACTORY-INSTALLED Options A. Disconnect Switch Perfect Humidity Dehumidification SystemAccessory Field-Installed Humidistat Optional EconoMi$er Convenience OutletManual Outdoor-Air Damper Hood Box Removal EconoMi$er IV Standard SensorsOutdoor-Air Hood Construction EconoMi$er IV Sensor Usage EconoMi$er IV Control ModesEconoMi$er IV Controller Potentiometer LED Locations Enthalpy Changeover Set Points Page Ppm CO2 Sensor Standard SettingsUnit Heater Required Config VII. Adjust EVAPORATOR-FAN SpeedMinimum Required Airflow Exceptions UrationEvaporator-Fan Motor Data Standard Motor Fan Rpm at Motor Pulley Setting* Standard Motor/DriveFan Rpm at Motor Pulley Setting* High-Static Motor/Drive Accessory/FIOP Electric Heaters Static Pressure in. wg Accessory/FIOP EconoMi$er IV Static Pressure* in. wgEvaporator-Fan Motor Data High-Static Motors General FAN Performance NotesAirflow 866 697 1088 756 1324 832 690 1051 750 1285901 703 1125 762 1365 974 716 1204 774 1449506 629 625 688 745 489 386866 502 4241656 15671748 1844805 695 953 749 1100 799 1249 748 684 891 738 1034 789 1177865 707 760 1170 809 1323929 718 1086 771 1244 820 1401 865 707 1018 760 1170 809 13231665 1873668 1116 726 654 1040 713683 1197 739 697 1281 753596 629 802 694 1021 465 4021252 471 421882 684 1125 746 1378 823 674 1059 737 1306944 695 1194 756 1453 1009 705 1266 766 1533467 614 594 681 728 462 348868 474 3812821 27162293 996 2501 1038 2713 29301677 808 1876 855 2081 710 1482723 1577 1775 820 19781582 796 1777 1492 784 16831677 808 1876 1877781 1445 614 929 673628 997 685 791 1525VI. Refrigerant Service Ports Internal WiringPRE-START-UP START-UP Unit PreparationXI. Safety Relief Heating if Accessory Heater is InstalledIX. Cooling XII. Ventilation Continuous FANPerfect Humidity System Normal Design Cooling Operation Service Cleaning Units With Power ExhaustEvaporator Coil Condenser CoilsIV. BELT/PULLEY Adjustment III. CONDENSER-FAN Adjustment FIGECONOMI$ER IV Adjustment II. LubricationCooling Charging Charts, Standard 551B090 Unit Cooling Charging Charts, Standard 551B120 Unit VII. Replacement Parts Problem Cause Remedy Troubleshooting Unit TroubleshootingCooling Troubleshooting Reheat Mode Will Not Energize Subcooling Mode Liquid ReheatWill Not Energize Low System CapacityII. ECONOMI$ER IV Troubleshooting EconoMi$er IV Input/Output Logic EconoMi$er IV Troubleshooting CompletionInputs Outputs Demand Control EnthalpyIndex Operating sequence Cooling EconoMi$er HeatingPage Temperatures START-UP ChecklistPreliminary Information 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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