Bryant 581B036--072, 581C024--060 Unit Troubleshooting, Economi$er IV Troubleshooting

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TROUBLESHOOTING

Unit Troubleshooting

Refer to Tables 39-43 for unit troubleshooting details.

Economi$er IV Troubleshooting

See Table 44 for EconoMi$er IV logic.

A functional view of the EconoMi$er IV is shown in Fig. 60. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$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 9v. 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.

581B,C

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Contents Installation Instructions Rig and Place Unit Install External Trap for Condensate DrainProvide Unit Support Field Fabricate DuctworkRoof Curb Details Install Gas Piping Install Flue HoodRoof Curb Alignment 581B 036-072 Base Unit Dimensions 581C 024-060 Base Unit Dimensions Make Electrical Connections Field Power SupplyField Control Wiring Heat Anticipator SettingsBase Unit 581B Physical Data 581BUnit Size 581B Base Unit 581C Physical Data 581CUnit Size 581C Power Wiring Connections 581C024---060 Electrical Data 581CElectrical Data 581B Manual Outdoor Damper Adjust Factory-Installed OptionsAssembly Perfect Humidity Adaptive Dehumidification SystemTypical Perfect Humidity t Adaptive Dehumidification System Outdoor-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$er IV Control ModesOutdoor Dry Bulb Changeover Economi$er IV Sensor UsageEconoMi$er IV Wiring Minimum Position Control Exhaust Set Point AdjustmentThermostats Damper MovementDemand Controlled Ventilation DCV Enthalpy Changeover Set Points Belt Drive Motors Dehumidification of Fresh Air with DCV ControlBelt Drive Motor Mounting CO2Sensor Standard SettingsEvaporator-Fan Motor Data High-Static Motors 581B Fan Rpm at Motor Pulley Setting With High-Static MotorAccessory Static Pressure Evaporator-Fan Motor Data Standard MotorARI Octave Bands Unit Rating 581B Outdoor Sound Power Total Unit581C Outdoor Sound Power Total Unit ARI Octavebands Rating Unit Weighted1300 Rpm Bhp1100 1200Rpm Bhp Watts 1700 Rpm Bhp WattsWatts Rpm Bhp 1200 16001642 2333 1704 Rpm Bhp Watts 15002800 Watts Rpm Bhp 18002600 27002700 2800 2900 3000 Bhp Watts RpmBhp 600 Watts Rpm Bhp Watts 900Watts Rpm Bhp 900 Bhp Watts 1700 1800 1900 20001900 2000 2100 2200 2300 2400 2500 800 350 904 438 999 535 1087 640 1169 753 913 569 913 569 1010 715 Gas Piping Internal WiringRefrigerant Service Ports Unit PreparationCooling Compressor RotationMain Burners Operating Sequence Safety ReliefHeating Ventilation Continuous FanHot Gas Reheat Mode Subcooling ModeHeating Units With Economi$er One-Row Coils CleaningEvaporator Coil Condenser CoilLoss-of-Charge Switch Condenser-Fan AdjustmentEconoMi$er IV Adjustment High Pressure SwitchPerfect Humidity System Charging Low Charge CoolingC06142 Flue Gas Passageways 581C 3 TON Charging Chart 581C 5 TON Charging Chart Combustion-Air Blower Limit SwitchLED Error Code Description Removal and Replacement of Gas Train SeeReplacement Parts OFM Economi$er IV Troubleshooting Unit TroubleshootingLED OFF Economi$er IV Troubleshooting CompletionLED Error Code Service Analysis Symptom Cause RemedyProblem Cause Remedy Heating Service AnalysisCooling Service Analysis Inputs Outputs EconoMi$er IV Input/Output LogicCatalog No. II581B---C---36---1 Preliminary Information
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