Bryant 551C, 551B installation instructions Unit Troubleshooting, Economi$er IV Troubleshooting

Page 57

TROUBLESHOOTING

Unit Troubleshooting

Refer to Tables 35-37 for unit troubleshooting details.

Economi$er IV Troubleshooting

See Table 38 for EconoMi$er IV logic.

A functional view of the EconoMi$er IV is shown in Fig. 61. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available from your Bryant distributor to help with EconoMi$er IV training and troubleshooting.

EconoMi$er IV Preparation

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

NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm resistor, and a 5.6 kilo-ohm resistor which are not supplied with the EconoMi$er IV.

IMPORTANT: Be sure to record the positions of all potentiometers before starting troubleshooting.

1.Disconnect power at TR and TR1. All LEDs should be off. Exhaust fan contacts should be open.

2.Disconnect device at P and P1.

3.Jumper P to P1.

4.Disconnect wires at T and T1. Place 5.6 kilo-ohm resistor across T and T1.

5.Jumper TR to 1.

6.Jumper TR to N.

7.If connected, remove sensor from terminals SO and +. Connect 1.2 kilo-ohm 4074EJM checkout resistor across terminals SO and +.

8.Put 620-ohm resistor across terminals SR and +.

9.Set minimum position, DCV set point, and exhaust potentiometers fully CCW (counterclockwise).

10.Set DCV maximum position potentiometer fully CW (clockwise).

11.Set enthalpy potentiometer to D.

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

Differential Enthalpy

To check differential enthalpy:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Place 620-ohm resistor across SO and +.

3.Place 1.2 kilo-ohm resistor across SR and +. The Free Cool LED should be lit.

4.Remove 620-ohm resistor across SO and +. The Free Cool LED should turn off.

5.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

Single Enthalpy

To check single enthalpy:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Set the enthalpy potentiometer to A (fully CCW). The Free Cool LED should be lit.

3.Set the enthalpy potentiometer to D (fully CW). The Free Cool LED should turn off.

4.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

DCV (Demand Controlled Ventilation) and Power Exhaust

To check DCV and Power Exhaust:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Ensure terminals AQ and AQ1 are open. The LED for both DCV and Exhaust should be off. The actuator should be fully closed.

3.Connect a 9-v battery to AQ (positive node) and AQ1 (negative node). The LED for both DCV and Exhaust should turn on. The actuator should drive to between 90 and 95% open.

4.Turn the Exhaust potentiometer CW until the Exhaust LED turns off. The LED should turn off when the potentiometer is approximately 90%. The actuator should remain in position.

5.Turn the DCV set point potentiometer CW until the DCV LED turns off. The DCV LED should turn off when the potentiometer is approximately 9 v. The actuator should drive fully closed.

6.Turn the DCV and Exhaust potentiometers CCW until the Exhaust LED turns on. The exhaust contacts will close 30 to 120 seconds after the Exhaust LED turns on.

7.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

DCV Minimum and Maximum Position

To check the DCV minimum and maximum position:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Connect a 9-v battery to AQ (positive node) and AQ1 (negative node). The DCV LED should turn on. The actuator should drive to between 90 and 95% open.

3.Turn the DCV Maximum Position potentiometer to midpoint. The actuator should drive to between 20 and 80% open.

4.Turn the DCV Maximum Position potentiometer to fully CCW. The actuator should drive fully closed.

5.Turn the Minimum Position potentiometer to midpoint. The actuator should drive to between 20 and 80% open.

6.Turn the Minimum Position Potentiometer fully CW. The actuator should drive fully open.

7.Remove the jumper from TR and N. The actuator should drive fully closed.

8.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

Supply-Air Input

To check supply-air input:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Set the Enthalpy potentiometer to A. The Free Cool LED turns on. The actuator should drive to between 20 and 80% open.

3.Remove the 5.6 kilo-ohm resistor and jumper T to T1. The actuator should drive fully open.

4.Remove the jumper across T and T1. The actuator should drive fully closed.

5.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

551B,C

57

Page 56 Page 58
Image 57
Page 56 Page 58
Contents Installation Instructions Provide Unit Support Install External Trap for Condensate DrainField Fabricate Ductwork Rig and Place UnitRoof Curb Details Unit Leveling Tolerances Unit Operating Dimensions Weight 551C551B 551B 036-072 Base Unit Dimensions 551C 024-060 Base Unit Dimensions Field Control Wiring Field Power SupplyHeat Anticipator Settings Make Electrical ConnectionsBase 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 Outdoor-Air Damper Position Setting Outdoor-Air Damper With Hood AttachedEconoMi$er IV Component Locations Optional EconoMi$er Supply Air Sensor Temperature Resistance Values Supply Air Temperature SAT SensorTemperature F Outdoor Air Lockout SensorEconoMi$er IV Control Modes Outdoor Dry Bulb Changeover EconoMi$er IV Sensor UsageDifferential Dry Bulb Control Differential Enthalphy Control Outdoor Enthalpy ChangeoverIndoor Air Quality IAQ Sensor Input Exhaust Set Point AdjustmentMinimum Position Control Damper MovementReturn Air Temperature or Enthalpy Sensor Mounting Location Outside Air Temperature Changeover Set PointsEconoMi$er IV Control CO2 Sensor ConfigurationCO2Sensor Standard Settings Adjust Evaporator-Fan SpeedDehumidification of Fresh Air with DCV Control Belt Drive MotorsUnit Motor Pulley Turns Open Evaporator-Fan Motor Data High-Static Motors Evaporator-Fan Motor Data Standard MotorMotor 551B Efficiency Evaporator-Fan Motor Efficiency024, 036 060 74/84 072 Airflow879 Rpm Bhp Watts 900 566 142 690 228957 522 1000 598 173 718 267 9031300 701 809 418 902 540 983 665 Rpm Bhp Watts 1200 666 252 778 361 873 476 956 5941400 737 355 842 481 932 610 875 551 962 6891600 828 412 931 536 1022 670 Rpm Bhp Watts 1500 790 353 897 471 991 6001700 866 478 966 608 1800 905 551 1001 6871472 1761 1600 1462 20671495 1858 1700 1463 1766 1520 1964 18002300 1104 1046 1185 1212 1260 1386 2200 1063 929 1147 1089 1224 1256 1295 14312400 1145 1174 1223 1346 1296 1526 2500 1185 1311 1262 14901900 945 638 1042 796 Rpm Bhp Watts 1800 907 558 1006 708 1092 8602000 984 727 1078 892 2100 1024 823 1115 9972200 1063 929 1152 1111 1230 1294 2100 1024 823 1115 997 1195 1173 1268 13502300 1103 1044 1189 1234 1266 1425 2400 1143 1168 1227 13671000 583 163 707 Rpm Bhp Watts 900 554 134 6811100 612 195 735 9191300 674 276 Rpm Bhp Watts 1200 643 233 762 3441400 706 324 1500 738 3791600 757 343 866 455 962 580 Rpm Bhp Watts 1500 724 295 837 402 937 524 1028 660719 1700 790 398 894 514 988 6431490 1873 1800 1474 1797 17001508 1957 1900 1467 1839 1527 2050 20002500 1069 1084 1149 1239 1223 1403 1293 1576 2400 1033 970 1115 1120 1192 1279 1264 1448Rpm Bhp Watts 1500 1188 970 1261 1143 1600 1208 1033 12792500 1061 1053 1148 1233 1226 1416 1297 1604 2400 1026 945 1115 1118 1195 1295 1268 14762600 1097 1169 1181 1356 1257 1546 2700 1132 1294 1214 1487 1289 1684Refrigerant Service Ports Internal WiringUnit Preparation Return-Air FiltersCooling Safety ReliefHeating Ventilation Continuous FanEvaporator Coil CleaningLubrication EconoMi$er IV Adjustment Condenser-Fan AdjustmentRefrigerant Charge No ChargeCooling Charging Chart Standard 551B Replacement Parts 551C 3 TON Charging Chart 551C 5 TON Charging Chart Economi$er IV Troubleshooting Unit TroubleshootingEconoMi$er IV Troubleshooting Completion Cooling Service AnalysisProblem Cause Remedy Inputs Outputs EconoMi$er IV Input/Output LogicEconoMi$er IV Functional View Catalog No. II551B---C---36---1 Preliminary Information
Related manuals
Manual 170 pages 34.1 Kb Manual 52 pages 34.7 Kb

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.
Top Page Image Contents