Carrier 48HE003---006, 48HJ004---007 installation instructions Cooling Service Analysis

Page 62

48HE,HJ

Table 45—Cooling Service Analysis

PROBLEM

CAUSE

REMEDY

Compressor and Condenser Fan

Power failure.

Call power company.

Will Not Start.

 

 

Fuse blown or circuit breaker tripped.

Replace fuse or reset circuit breaker.

 

Defective thermostat, contactor, transformer, or

Replace component.

 

control relay.

 

 

Insufficient line voltage.

Determine cause and correct.

 

Incorrect or faulty wiring.

Check wiring diagram and rewire correctly.

 

Thermostat setting too high.

Lower thermostat setting below room tempera-

 

 

ture.

Compressor Will Not Start

Faulty wiring or loose connections in compres-

Check wiring and repair or replace.

But Condenser Fan Runs.

sor circuit.

 

 

Compressor motor burned out, seized, or in-

Determine cause. Replace compressor.

 

ternal overload open.

 

 

Defective run/start capacitor, overload, start

Determine cause and replace.

 

relay.

 

 

One leg of 3-phase power dead.

Replace fuse or reset circuit breaker. Determine

 

 

cause.

Compressor Cycles (Other Than

Refrigerant overcharge or undercharge.

Recover refrigerant, evacuate system, and re-

Normally Satisfying Thermostat).

 

charge to nameplate.

 

Defective compressor.

Replace and determine cause.

 

Insufficient line voltage.

Determine cause and correct.

 

Blocked condenser.

Determine cause and correct.

 

Defective run/start capacitor, overload, or start

Determine cause and replace.

 

relay.

 

 

Defective thermostat.

Replace thermostat.

 

Faulty condenser-fan motor or capacitor.

Replace.

 

Restriction in refrigerant system.

Locate restriction and remove.

Compressor Operates Continuously.

Dirty air filter.

Replace filter.

 

Unit undersized for load.

Decrease load or increase unit size.

 

Thermostat set too low.

Reset thermostat.

 

Low refrigerant charge.

Locate leak, repair, and recharge.

 

Leaking valves in compressor.

Replace compressor.

 

Air in system.

Recover refrigerant, evacuate system, and re-

 

 

charge.

 

Condenser coil dirty or restricted.

Clean coil or remove restriction.

Excessive Head Pressure.

Dirty air filter.

Replace filter.

 

Dirty condenser coil.

Clean coil.

 

Refrigerant overcharged.

Recover excess refrigerant.

 

Air in system.

Recover refrigerant, evacuate system, and re-

 

 

charge.

 

Condenser air restricted or air short-cycling.

Determine cause and correct.

Head Pressure Too Low.

Low refrigerant charge.

Check for leaks, repair, and recharge.

 

Compressor valves leaking.

Replace compressor.

 

Restriction in liquid tube.

Remove restriction.

Excessive Suction Pressure.

High heat load.

Check for source and eliminate.

 

Compressor valves leaking.

Replace compressor.

 

Refrigerant overcharged.

Recover excess refrigerant.

Suction Pressure Too Low.

Dirty air filter.

Replace filter.

 

Low refrigerant charge.

Check for leaks, repair, and recharge.

 

Metering device or low side restricted.

Remove source of restriction.

 

Insufficient evaporator airflow.

Increase air quantity. Check filter and replace if

 

 

necessary.

 

Temperature too low in conditioned area.

Reset thermostat.

 

Outdoor ambient below 25 F.

Install low-ambient kit.

Evaporator Fan Will Not Shut Off.

Time off delay not finished.

Wait for 30-second off delay.

62

Page 61 Page 63
Image 62
Page 61 Page 63
Contents Installation Instructions Electrical Shock HazardAlternate 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 Physical Data 48HJ Nominal CapacityHJE HJD Physical Data 48HE HEE HED Power Wiring Connections Electrical Data 48HE 48HE003---006Electrical Data 48HJ 38.2 242 208/230---3---60 187 254 12.4 Manual outdoor damper AssemblyHUMIDI-MIZERADAPTIVE Dehumidification System Convenience outletTypical Humidi-MiZer t Adaptive Dehumidification System Install the Indoor Air Quality CO2 Sensor Install the Supply Air Temperature SAT SensorOutdoor Air Temperature Sensor OAT Enthalpy Sensors and ControlPremierLinkSensor Usage PremierLink ControllerPremierLinktController Installed Return Air Enthalphy Sensor EconoMi$er IV Component LocationsOutdoor Air Temperature OAT Sensor ECONOMI$ER IV Standard SensorsECONOMI$ER IV Control Modes EconoMi$er IV Wiring RUNIndoor Air Quality IAQ Sensor Input Exhaust Set Point AdjustmentDifferential Enthalphy Control Damper Movement Minimum Position ControlThermostats Enthalpy Changeover Set Points Demand Controlled Ventilation DCVBelt drive motors Adjust Evaporator-Fan SpeedDehumidification of Fresh Air with DCV Control CO2Sensor Standard Settings Belt Drive Motor MountingEvaporator-Fan Motor Data Standard Motor 48HJ Fan Rpm at Motor Pulley Setting With High-Static MotorAccessory static pressure Evaporator-Fan Motor Data High-Static MotorsUnit ARI Octave Bands Rating 48HJ Outdoor Sound Power Total Unit48HE Outdoor Sound Power Total Unit Airflow1200 Rpm Bhp1100 1300Rpm Bhp Watts 1600 Rpm Bhp WattsWatts Rpm Bhp 1200 1700Rpm Bhp Watts 1500 1642 2333 17042700 Watts Rpm Bhp 18002600 2800Bhp 600 Bhp Watts Rpm2700 2800 2900 3000 Watts Rpm Bhp 900 Bhp Watts 900Watts Rpm 1700 1800 1900 2000 Bhp Watts1900 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 Unit Preparation Internal WiringRefrigerant Service Ports Gas PipingHeating CoolingMain Burners Operating Sequence Cooling units without economizer Safety ReliefVentilation Continuous Fan Heating units without economizerDX Cooling Temperature Control Example Routine 3 OATNormal Design Operation Subcooling ModeUnits with HUMIDI-MIZERADAPTIVE Dehumidification System Condenser coil CleaningEvaporator Coil One-Row CoilsFilters Condenser-Fan AdjustmentHigh Pressure Switch Lubrication CompressorHUMIDI-MIZERSYSTEM Charging Cooling Charging Chart Standard 48HJ006 To USE Cooling Charging CHART, Standard Unit Flue Gas Passageways Combustion-Air BlowerRemoval and Replacement of GAS Train See Limit SwitchLED Error Code Description Burner IgnitionReplacement Parts LOW HeatOFM Dcv demand controlled ventilation and power exhaust Unit TroubleshootingEconomi$er IV Troubleshooting Economi$er IV troubleshooting completionComponent Damage Hazard LED Error Code Service AnalysisSymptom Cause Remedy LED OFFHeating Service Analysis Problem Cause RemedyCooling Service Analysis EconoMi$er IV Input/Output Logic Inputs OutputsSTART-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.

The 48HJ series features advanced rooftop units that are ideal for commercial settings. They come equipped with high-efficiency scroll compressors that provide superior cooling and heating capabilities. This series is noted for its compact design, allowing for easy installation on rooftops or other constrained spaces. The units offer variable capacity operation, which enables them to efficiently meet varying heating and cooling demands without unnecessary energy consumption.

One of the standout features of the 48HJ series is its use of advanced microprocessor controls. This technology allows for precise temperature management and system diagnostics, enhancing the ease of operation while ensuring maximum comfort. Additionally, the series supports advanced connectivity options, enabling integration with building management systems. This allows for remote monitoring and control, making it easier for facility managers to keep track of performance and energy usage.

On the other hand, the 48HE series specializes in high-efficiency heating and cooling performance. These units are designed for larger commercial spaces and come with robust features for enhanced durability and efficiency. Like the 48HJ series, the 48HE models utilize scroll compressors and are equipped with a high-efficiency fan setup for improved airflow and reduced noise levels.

The 48HE also includes an innovative heat pump option, which allows the system to reverse the cooling process to provide heating, making it versatile across different seasonal demands. Both series are designed with eco-friendly refrigerants that comply with the latest environmental regulations, ensuring a minimized ecological footprint.

In terms of energy efficiency, both the 48HJ and 48HE series hold impressive SEER and EER ratings, contributing to reduced operational costs over time. The units are also built with durable, corrosion-resistant materials, ensuring longevity and low maintenance needs.

In conclusion, Carrier 48HJ004---007 and 48HE003---006 models are designed with cutting-edge technology, energy efficiency, and flexibility in mind. Their robust features make them ideal choices for commercial applications, providing reliable comfort and operational excellence. Whether for cooling or heating, these systems stand out in performance and sustainability, earning Carrier's reputation as a leader in the HVAC market.
Top Page Image Contents