Bryant 551B, 551C EconoMi$er IV Troubleshooting Completion, Cooling Service Analysis

Page 58

EconoMi$er IV Troubleshooting Completion

This procedure is used to return the EconoMi$er IV to operation. No troubleshooting or testing is done by performing the following procedure.

1.Disconnect power at TR and TR1.

2.Set enthalpy potentiometer to previous setting.

3.Set DCV maximum position potentiometer to previous setting.

4.Set minimum position, DCV set point, and exhaust potentiometers to previous settings.

5.Remove 620-ohm resistor from terminals SR and +.

6.Remove 1.2 kilo-ohm checkout resistor from terminals SO and +. If used, reconnect sensor from terminals SO and +.

7.Remove jumper from TR to N.

8.Remove jumper from TR to 1.

9.Remove 5.6 kilo-ohm resistor from T and T1. Reconnect wires at T and T1.

10.Remove jumper from P to P1. Reconnect device at P and P1.

11.Apply power (24 vac) to terminals TR and TR1.

551B,C

Table 35—Cooling Service Analysis

 

 

 

PROBLEM

CAUSE

REMEDY

Compressor and Condenser Fan

Power failure.

Call power company.

Will Not Start.

 

 

Fuse blown or circuit breaker tripped.

Replace fuse or reset circuit breaker.

 

Defective thermostat, contactor, transformer, or

Replace component.

 

control relay.

 

 

Insufficient line voltage.

Determine cause and correct.

 

Incorrect or faulty wiring.

Check wiring diagram and rewire correctly.

 

Thermostat setting too high.

Lower thermostat setting below room temperature.

Compressor Will Not Start

Faulty wiring or loose connections in compres-

Check wiring and repair or replace.

But Condenser Fan Runs.

sor circuit.

 

 

Compressor motor burned out, seized, or in-

Determine cause. Replace compressor.

 

ternal overload open.

 

 

Defective run/start capacitor, overload, start

Determine cause and replace.

 

relay.

 

 

One leg of 3-phase power dead.

Replace fuse or reset circuit breaker. Determine

 

 

cause.

Compressor Cycles (Other Than

Refrigerant overcharge or undercharge.

Recover refrigerant, evacuate system, and recharge

Normally Satisfying Thermostat).

 

to nameplate.

 

Defective compressor.

Replace and determine cause.

 

Insufficient line voltage.

Determine cause and correct.

 

Blocked condenser.

Determine cause and correct.

 

Defective run/start capacitor, overload, or start

Determine cause and replace.

 

relay.

 

 

Defective thermostat.

Replace thermostat.

 

Faulty condenser-fan motor or capacitor.

Replace.

 

Restriction in refrigerant system.

Locate restriction and remove.

Compressor Operates Continuously.

Dirty air filter.

Replace filter.

 

Unit undersized for load.

Decrease load or increase unit size.

 

Thermostat set too low.

Reset thermostat.

 

Low refrigerant charge.

Locate leak, repair, and recharge.

 

Leaking valves in compressor.

Replace compressor.

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

Condenser coil dirty or restricted.

Clean coil or remove restriction.

Excessive Head Pressure.

Dirty air filter.

Replace filter.

 

Dirty condenser coil.

Clean coil.

 

Refrigerant overcharged.

Recover excess refrigerant.

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

Condenser air restricted or air short-cycling.

Determine cause and correct.

Head Pressure Too Low.

Low refrigerant charge.

Check for leaks, repair, and recharge.

 

Compressor valves leaking.

Replace compressor.

 

Restriction in liquid tube.

Remove restriction.

Excessive Suction Pressure.

High heat load.

Check for source and eliminate.

 

Compressor valves leaking.

Replace compressor.

 

Refrigerant overcharged.

Recover excess refrigerant.

Suction Pressure Too Low.

Dirty air filter.

Replace filter.

 

Low refrigerant charge.

Check for leaks, repair, and recharge.

 

Metering device or low side restricted.

Remove source of restriction.

 

Insufficient evaporator airflow.

Increase air quantity. Check filter and replace if neces-

 

 

sary.

 

Temperature too low in conditioned area.

Reset thermostat.

 

Outdoor ambient below 25 F.

Install low-ambient kit.

Evaporator Fan Will Not Shut Off.

Time off delay not finished.

Wait for 30-second off delay.

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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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