Bryant 551C, 551B installation instructions EconoMi$er IV Input/Output Logic, Inputs Outputs

Page 59

Table 36—Perfect Humidity™ Adaptive Dehumidification System Subcooling Mode Service Analysis

PROBLEM

CAUSE

 

REMEDY

Subcooling Mode (Liquid Reheat)

No power to control transformer from

Check power source and evaporator-fan relay. Ensure all

Will Not Energize.

evaporator-fan motor.

wire connections are tight.

 

No power from control transformer to liquid line

1.

Fuse open; check fuse. Ensure continuity of wiring.

 

solenoid valve.

2.

Low-pressure switch open. Cycle unit off and allow

 

 

 

low-pressure switch to reset. Replace switch if it will

 

 

 

not close.

 

 

3. Transformer bad; check transformer.

 

Liquid line solenoid valve will not operate.

1.

Solenoid coil defective; replace.

 

 

2.

Solenoid valve stuck open; replace.

 

Liquid line solenoid valve will not open.

Valve is stuck closed; replace valve.

Low System Capacity.

Low refrigerant charge or frosted evaporator coil.

1.

Check charge amount. Charge per Fig. 53---56.

 

 

2.

Evaporator coil frosted; check and replace low-pres-

 

 

 

sure switch if necessary.

Loss of Compressor Superheat

Thermostatic expansion valve (TXV).

1.

Check TXV bulb mounting, and secure tightly to suc-

Conditions with Subcooling/Reheat

 

2.

tion line.

Dehumidification Coil Energized.

 

Replace TXV if stuck open or closed.

Table 37—Perfect Humidity™ Adaptive Dehumidification System Hot Gas Reheat Mode Service Analysis

PROBLEM

CAUSE

 

REMEDY

Reheat Mode Will Not Energize.

No power to control transformer from

Check power source and evaporator-fan relay. Ensure all

 

evaporator-fan motor.

wire connections are tight.

 

No power from control transformer to hot gas

1.

Fuse open; check fuse. Ensure continuity of wiring.

 

line solenoid valve

2.

Low-pressure switch open. Cycle unit off and allow

 

 

 

low-pressure switch to reset. Replace switch if it will

 

 

 

not close.

 

 

3. Transformer bad; check transformer.

 

Hot gas line solenoid valve will not operate.

1.

Solenoid coil defective; replace.

 

 

2.

Solenoid valve stuck closed; replace.

 

Low refrigerant charge or frosted evaporator coil.

1.

Check charge amount. Charge per Fig. 53---56.

 

 

2.

Evaporator coil frosted; check and replace low-pres-

 

 

 

sure switch if necessary.

Loss of Compressor Superheat

Thermostatic expansion valve (TXV).

1.

Check TXV bulb mounting, and secure tightly to suc-

Conditions with Subcooling/Reheat

 

2.

tion line.

Dehumidification Coil Energized.

 

Replace TXV if stuck open or closed.

Excessive Superheat.

Liquid line solenoid valve will not operate.

Valve is stuck, replace valve.

 

Hot gas line solenoid valve will not close.

Valve is stuck; replace valve.

551B,C

Table 38—EconoMi$er IV Input/Output Logic

 

INPUTS

 

 

 

 

 

OUTPUTS

 

Demand Control

Enthalpy*

 

 

 

Compressor

N Terminal†

Outdoor

Return

Y1

Y2

Stage

Stage

Occupied

Unoccupied

Ventilation (DCV)

 

 

1

2

Damper

 

 

 

 

 

Below set

High

Low

On

On

On

On

Minimum position

Closed

(DCV LED Off)

(Free Cooling LED Off)

 

 

 

 

 

 

 

 

On

Off

On

Off

 

 

 

 

 

Off

Off

Off

Off

 

 

 

Low

High

On

On

On

Off

Modulating** (between min.

Modulating** (between

 

(Free Cooling LED On)

 

 

 

 

 

position and full-open)

closed and full-open)

 

 

On

Off

Off

Off

 

 

 

Off

Off

Off

Off

Minimum position

Closed

Above set

High

Low

On

On

On

On

Modulating†† (between min.

Modulating†† (between

(DCV LED On)

(Free Cooling LED Off)

 

 

 

 

 

position and DCV maximum)

closed and DCV

 

On

Off

On

Off

 

 

 

 

 

 

 

 

maximum)

 

 

 

Off

Off

Off

Off

 

 

 

 

 

 

 

Low

High

On

On

On

Off

Modulating***

Modulating†††

 

(Free Cooling LED On)

 

 

 

 

 

 

 

 

 

On

Off

Off

Off

 

 

 

 

 

Off

Off

Off

Off

 

 

*For single enthalpy control, the module compares outdoor enthalpy to the ABCD set point.

†Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied). **Modulation is based on the supply-air sensor signal.

††Modulation is based on the DCV signal.

***Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV) or fully open (sup- ply-air signal).

†††Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully open (supply-air sig- nal).

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Contents Installation Instructions Rig and Place Unit Install External Trap for Condensate DrainProvide Unit Support Field Fabricate DuctworkRoof Curb Details Unit Leveling Tolerances 551B Unit Operating Dimensions Weight551C 551B 036-072 Base Unit Dimensions 551C 024-060 Base Unit Dimensions Make Electrical Connections Field Power SupplyField Control Wiring Heat Anticipator SettingsBase Unit 551B Physical Data 551BBase Unit 551C Physical Data 551CPower Wiring Connections FLA MCA LRA Type Outlet Electrical Data-551CPerf ect Voltage FLA Crheater 008,009 23.4 30.1 40.8 FLA MCA LRA Electrical Data-551B414 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 EconoMi$er IV Component Locations Optional EconoMi$er Outdoor-Air Damper Position SettingOutdoor-Air Damper With Hood Attached Outdoor Air Lockout Sensor Supply Air Temperature SAT SensorSupply Air Sensor Temperature Resistance Values Temperature FDifferential Dry Bulb Control EconoMi$er IV Control Modes Outdoor Dry Bulb ChangeoverEconoMi$er IV Sensor Usage Differential Enthalphy Control Outdoor Enthalpy ChangeoverDamper Movement Exhaust Set Point AdjustmentIndoor Air Quality IAQ Sensor Input Minimum Position ControlReturn Air Temperature or Enthalpy Sensor Mounting Location Outside Air Temperature Changeover Set PointsEconoMi$er IV Control CO2 Sensor ConfigurationBelt Drive Motors Adjust Evaporator-Fan SpeedCO2Sensor Standard Settings Dehumidification of Fresh Air with DCV ControlUnit Motor Pulley Turns Open Evaporator-Fan Motor Data High-Static Motors Evaporator-Fan Motor Data Standard MotorAirflow Evaporator-Fan Motor EfficiencyMotor 551B Efficiency 024, 036 060 74/84 072903 Rpm Bhp Watts 900 566 142 690 228879 957 522 1000 598 173 718 267875 551 962 689 Rpm Bhp Watts 1200 666 252 778 361 873 476 956 5941300 701 809 418 902 540 983 665 1400 737 355 842 481 932 6101800 905 551 1001 687 Rpm Bhp Watts 1500 790 353 897 471 991 6001600 828 412 931 536 1022 670 1700 866 478 966 6081463 1766 1520 1964 1800 1462 20671472 1761 1600 1495 1858 17002500 1185 1311 1262 1490 2200 1063 929 1147 1089 1224 1256 1295 14312300 1104 1046 1185 1212 1260 1386 2400 1145 1174 1223 1346 1296 15262100 1024 823 1115 997 Rpm Bhp Watts 1800 907 558 1006 708 1092 8601900 945 638 1042 796 2000 984 727 1078 8922400 1143 1168 1227 1367 2100 1024 823 1115 997 1195 1173 1268 13502200 1063 929 1152 1111 1230 1294 2300 1103 1044 1189 1234 1266 1425919 Rpm Bhp Watts 900 554 134 6811000 583 163 707 1100 612 195 7351500 738 379 Rpm Bhp Watts 1200 643 233 762 3441300 674 276 1400 706 3241700 790 398 894 514 988 643 Rpm Bhp Watts 1500 724 295 837 402 937 524 1028 6601600 757 343 866 455 962 580 7191467 1839 1527 2050 2000 1474 1797 17001490 1873 1800 1508 1957 19001600 1208 1033 1279 2400 1033 970 1115 1120 1192 1279 1264 14482500 1069 1084 1149 1239 1223 1403 1293 1576 Rpm Bhp Watts 1500 1188 970 1261 11432700 1132 1294 1214 1487 1289 1684 2400 1026 945 1115 1118 1195 1295 1268 14762500 1061 1053 1148 1233 1226 1416 1297 1604 2600 1097 1169 1181 1356 1257 1546Return-Air Filters Internal WiringRefrigerant Service Ports Unit PreparationVentilation Continuous Fan Safety ReliefCooling HeatingEvaporator Coil CleaningLubrication No Charge Condenser-Fan AdjustmentEconoMi$er IV Adjustment Refrigerant ChargeCooling Charging Chart Standard 551B Replacement Parts 551C 3 TON Charging Chart 551C 5 TON Charging Chart Economi$er IV Troubleshooting Unit TroubleshootingProblem Cause Remedy EconoMi$er IV Troubleshooting CompletionCooling Service Analysis Inputs Outputs EconoMi$er IV Input/Output LogicEconoMi$er IV Functional View Catalog No. II551B---C---36---1 Preliminary Information
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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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