Bryant 551B EconoMi$er IV Troubleshooting Completion, EconoMi$er IV Input/Output Logic, Terminal†

Page 49

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.

G.EconoMi$er IV Troubleshooting Completion

This procedure is used to return the EconoMi$er IV to opera- tion. 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 previ- ous 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 termi-

nals SO and +. If used, reconnect sensor from termi- nals 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. Recon- nect 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.

Table 33 — EconoMi$er IV Input/Output Logic

 

INPUTS

 

 

 

 

 

OUTPUTS

 

Demand Control

Enthalpy*

 

 

 

Compressor

N Terminal†

 

 

Y1

Y2

Stage

Stage

Occupied

Unoccupied

Ventilation (DCV)

Outdoor

Return

 

 

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)

 

On

Off

Off

Off

position and full-open)

closed and full-open)

 

 

 

 

 

 

 

 

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)

 

On

Off

On

Off

position and DCV maximum)

closed and DCV

 

 

 

 

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 (supply-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 signal).

Fig. 54 — EconoMi$er IV Functional View

49

Image 49
Contents Safety Considerations ContentsInstallation Provide Unit SupportIV. RIG and Place Unit III. Install Condensate Drain Line and External TrapPositioning 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 Manual Outdoor-Air Damper Convenience OutletOptional EconoMi$er Hood Box Removal EconoMi$er IV Standard SensorsOutdoor-Air Hood Construction EconoMi$er IV Sensor Usage EconoMi$er IV Control ModesEconoMi$er IV Controller Potentiometer LED Locations Enthalpy Changeover Set Points Page Ppm CO2 Sensor Standard SettingsUnit Heater Required Config VII. Adjust EVAPORATOR-FAN SpeedMinimum Required Airflow Exceptions UrationFan Rpm at Motor Pulley Setting* High-Static Motor/Drive Fan Rpm at Motor Pulley Setting* Standard Motor/DriveEvaporator-Fan Motor Data Standard Motor Accessory/FIOP Electric Heaters Static Pressure in. wg Accessory/FIOP EconoMi$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$ER IV Adjustment II. LubricationCooling Charging Charts, Standard 551B090 Unit Cooling Charging Charts, Standard 551B120 Unit VII. Replacement Parts Cooling Troubleshooting Troubleshooting Unit TroubleshootingProblem Cause Remedy Reheat Mode Will Not Energize Subcooling Mode Liquid ReheatWill Not Energize Low System CapacityII. ECONOMI$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

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