Bryant 551B installation instructions II. ECONOMI$ER IV Troubleshooting

Page 48

II. ECONOMI$ER IV TROUBLESHOOTING

See Table 33 for EconoMi$er IV logic.

A functional view of the EconoMi$er IV is shown in Fig. 54. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is avail- able from Bryant to help with EconoMi$er IV training and troubleshooting.

A. 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 potenti- ometers 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.

B. 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.

C.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.

D. 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 con- tacts 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.

E.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 mid- point. 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.

F.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.

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Contents Contents Safety ConsiderationsInstallation Provide Unit SupportIII. Install Condensate Drain Line and External Trap IV. RIG and Place UnitPositioning Roof Curb Details Weight OperatingBase Unit Dimensions Physical Data Unit 551BField Power Supply Make Electrical ConnectionsIFC NECElectrical Data FLA MCA Mocp LRA HacrVoltage Comp no Electric Heater Electric Heater Usage †Used to determine minimum disconnect per NECField Control Wiring Heat Anticipator SettingsVI. Adjust FACTORY-INSTALLED Options A. Disconnect Switch Perfect Humidity Dehumidification SystemAccessory Field-Installed Humidistat Convenience Outlet Manual Outdoor-Air DamperOptional EconoMi$er EconoMi$er IV Standard Sensors Hood Box RemovalOutdoor-Air Hood Construction EconoMi$er IV Control Modes EconoMi$er IV Sensor UsageEconoMi$er IV Controller Potentiometer LED Locations Enthalpy Changeover Set Points Page CO2 Sensor Standard Settings PpmVII. Adjust EVAPORATOR-FAN Speed Unit Heater Required ConfigMinimum Required Airflow Exceptions UrationFan Rpm at Motor Pulley Setting* Standard Motor/Drive Fan Rpm at Motor Pulley Setting* High-Static Motor/DriveEvaporator-Fan Motor Data Standard Motor Accessory/FIOP EconoMi$er IV Static Pressure* in. wg Accessory/FIOP Electric Heaters Static Pressure in. wgEvaporator-Fan Motor Data High-Static Motors General FAN Performance NotesAirflow 832 690 1051 750 1285 866 697 1088 756 1324901 703 1125 762 1365 974 716 1204 774 1449489 386 506 629 625 688 745866 502 4241567 16561748 1844748 684 891 738 1034 789 1177 805 695 953 749 1100 799 1249865 707 760 1170 809 1323865 707 1018 760 1170 809 1323 929 718 1086 771 1244 820 14011665 1873654 1040 713 668 1116 726683 1197 739 697 1281 753465 402 596 629 802 694 10211252 471 421823 674 1059 737 1306 882 684 1125 746 1378944 695 1194 756 1453 1009 705 1266 766 1533462 348 467 614 594 681 728868 474 3812716 28212293 996 2501 1038 2713 2930710 1482 1677 808 1876 855 2081723 1577 1775 820 19781492 784 1683 1582 796 17771677 808 1876 1877614 929 673 781 1445628 997 685 791 1525Internal Wiring VI. Refrigerant Service PortsPRE-START-UP START-UP Unit PreparationHeating if Accessory Heater is Installed XI. Safety ReliefIX. Cooling XII. Ventilation Continuous FANPerfect Humidity System Normal Design Cooling Operation Units With Power Exhaust Service CleaningEvaporator Coil Condenser CoilsIII. CONDENSER-FAN Adjustment FIG IV. BELT/PULLEY AdjustmentECONOMI$ER IV Adjustment II. LubricationCooling Charging Charts, Standard 551B090 Unit Cooling Charging Charts, Standard 551B120 Unit VII. Replacement Parts Troubleshooting Unit Troubleshooting Cooling TroubleshootingProblem Cause Remedy Subcooling Mode Liquid Reheat Reheat Mode Will Not EnergizeWill Not Energize Low System CapacityII. ECONOMI$ER IV Troubleshooting EconoMi$er IV Troubleshooting Completion EconoMi$er IV Input/Output LogicInputs Outputs Demand Control EnthalpyOperating sequence Cooling EconoMi$er Heating IndexPage START-UP Checklist TemperaturesPreliminary Information III. START-UP Electrical
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551B specifications

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