Carrier 48HJ004---007 Unit Troubleshooting, Economi$er IV Troubleshooting, Single enthalpy

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TROUBLESHOOTING

Step 1 —Unit Troubleshooting

Refer to Tables 35-39 for unit troubleshooting details.

Step 2 —Economi$er IV Troubleshooting

See Table 40 for EconoMi$er IV logic.

A functional view of the EconoMi$er IV is shown in Fig. 69. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available from Carrier 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.

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.

48HE,HJ

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Contents Electrical Shock Hazard Installation InstructionsAlternate Unit Support FIRE, Explosion HazardRoof Curb 48HE,HJ Positioning Install Flue HoodProperty Damage Hazard 48HJ Unit Operating Dimensions Weight48HE 48HJ004-007 Base Unit Dimensions 48HE003-006 Base Unit Dimensions Heat anticipator settings Field power supplyField control wiring Nominal Capacity Physical Data 48HJHJE HJD Physical Data 48HE HEE HED Power Wiring Connections 48HE003---006 Electrical Data 48HEElectrical Data 48HJ 38.2 242 208/230---3---60 187 254 12.4 Convenience outlet AssemblyHUMIDI-MIZERADAPTIVE Dehumidification System Manual outdoor damperTypical Humidi-MiZer t Adaptive Dehumidification System Enthalpy Sensors and Control Install the Supply Air Temperature SAT SensorOutdoor Air Temperature Sensor OAT Install the Indoor Air Quality CO2 SensorPremierLink Controller PremierLinkSensor UsagePremierLinktController Installed EconoMi$er IV Component Locations Return Air Enthalphy SensorECONOMI$ER IV Standard Sensors Outdoor Air Temperature OAT SensorECONOMI$ER IV Control Modes RUN EconoMi$er IV WiringIndoor Air Quality IAQ Sensor Input Exhaust Set Point AdjustmentDifferential Enthalphy Control Damper Movement Minimum Position ControlThermostats Demand Controlled Ventilation DCV Enthalpy Changeover Set PointsBelt drive motors Adjust Evaporator-Fan SpeedDehumidification of Fresh Air with DCV Control Belt Drive Motor Mounting CO2Sensor Standard SettingsEvaporator-Fan Motor Data High-Static Motors 48HJ Fan Rpm at Motor Pulley Setting With High-Static MotorAccessory static pressure Evaporator-Fan Motor Data Standard MotorAirflow 48HJ Outdoor Sound Power Total Unit48HE Outdoor Sound Power Total Unit Unit ARI Octave Bands Rating1300 Rpm Bhp1100 1200Rpm Bhp Watts 1700 Rpm Bhp WattsWatts Rpm Bhp 1200 16001642 2333 1704 Rpm Bhp Watts 15002800 Watts Rpm Bhp 18002600 2700Bhp 600 Bhp Watts Rpm2700 2800 2900 3000 Watts Rpm Bhp 900 Bhp Watts 900Watts Rpm Bhp Watts 1700 1800 1900 20001900 2000 2100 2200 2300 2400 2500 800 350 904 438 999 535 1087 640 1169 753 913 569 1250 1500 1750 2000 2250 2500 2750 3000 Gas Piping Internal WiringRefrigerant Service Ports Unit PreparationHeating CoolingMain Burners Heating units without economizer Safety ReliefVentilation Continuous Fan Operating Sequence Cooling units without economizerRoutine 3 OAT DX Cooling Temperature Control ExampleNormal Design Operation Subcooling ModeUnits with HUMIDI-MIZERADAPTIVE Dehumidification System One-Row Coils CleaningEvaporator Coil Condenser coilLubrication Compressor Condenser-Fan AdjustmentHigh Pressure Switch FiltersHUMIDI-MIZERSYSTEM Charging Cooling Charging Chart Standard 48HJ006 To USE Cooling Charging CHART, Standard Unit Combustion-Air Blower Flue Gas PassagewaysBurner Ignition Limit SwitchLED Error Code Description Removal and Replacement of GAS Train SeeLOW Heat Replacement PartsOFM Economi$er IV troubleshooting completion Unit TroubleshootingEconomi$er IV Troubleshooting Dcv demand controlled ventilation and power exhaustLED OFF LED Error Code Service AnalysisSymptom Cause Remedy Component Damage HazardProblem Cause Remedy Heating Service AnalysisCooling Service Analysis Inputs Outputs EconoMi$er IV Input/Output LogicSTART-UP Checklist

48HJ004---007, 48HE003---006 specifications

Carrier has long been a trusted name in the HVAC industry, and its models 48HJ004---007 and 48HE003---006 continue that legacy, offering efficient, reliable climate control solutions. These models are designed for different applications, ensuring optimal performance in a variety of environments.

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