Carrier 48/50PD05 manual Heating Troubleshooting, Variable Frequency Drive VFD Troubleshooting

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Heating Troubleshooting

Use the unit Scrolling Marquee display or a CCN device to view the heating status display and the heating diagnostic display (see Appendix A) for information on the heating operation. Check the current alarms and alarm history for any heating alarm codes and correct any causes. (See Table 12.) Verify any unique control configurations per installed site requirements or accessories. If alarms conditions are corrected and cleared, operation of the heat stages and indoor fan may be verified by using the Service Test mode. (See Table 5.)

Phase Reversal Protection

If the control senses an incorrect phase relationship, the relay (K1) will be de-energized (opening its contact). If the phase relationship is correct, the relay will be energized. The control has a self-bypass function after a pre-set time. If the control determines that the three phases stay in a correct relationship for 10 consecutive minutes, the relay will stay energized regardless of the phase sequence of three inputs as long as 24-vac control voltage is applied. This self-bypass function will be reset if all three phases are restored in a phase loss event.

48/50PD

Gas Heat (48PD Units Only)

See Table 12 for general gas heating service analysis. See Fig. 9 for service analysis of the IGC board logic. Check the status LED on the IGC board for any flashing alarm codes and correct any causes. (See Table 13.)

Electric Heat (50PD Units Only)

See Table 14 for electric heating service analysis.

Variable Frequency Drive (VFD) Troubleshooting

The VFD must be in “Auto” mode and when commanding it to 100% the voltage signal should be 10vdc across AI1 and AIGND. Verify all parameters are correct to factory defaults. See Appendix B for parameters and additional troubleshooting.

Phase Loss Protection

The phase loss protection option will monitor the three-phase electrical system to provide phase reversal and phase loss protection.

Phase Loss Protection

If the reverse rotation board senses any one of the three phase inputs has no AC voltage, the relay will be de-energized (opening its contact). This protection is always active as long as 24-vac control voltage is applied, and is not affected by the self by-pass function of the phase sequence monitoring function. However, in the event of phase loss, the relay will be re-energized only if all three phases are restored and the three phases are in the correct sequence.

A red LED is provided to indicate the function of the board. See the table below.

LED STATUS

FUNCTION

On Continuously

Relay contact closed (normal operation).

Blinking

Relay contact open (phase loss or phase

reversal has occurred) --- No power will be

 

supplied to the control system.

Off

24 vac control power not present (off).

Table 12 — Gas Heating Service Analysis

 

 

 

 

 

PROBLEM

CAUSE

REMEDY

Burners Will Not Ignite.

Unit is not configured for heat.

Check heating configurations using ComfortLinkt Scrolling

 

 

 

 

Marquee.

 

 

 

Active alarm.

Check active alarms using ComfortLinkt Scrolling Marquee and

 

 

 

 

the IGC alert flash codes.

 

 

 

No power to unit.

Check power supply, fuses, wiring, and circuit breakers.

 

 

 

No power to IGC.

Check fuses and plugs.

 

 

 

Heaters off due to time guard to prevent short

Check active alarms using ComfortLinkt Scrolling Marquee and

 

 

 

cycling.

the IGC alert flash codes.

 

 

 

Occupancy schedule set point not calling for

Check using ComfortLinkt Scrolling Marquee.

 

 

 

Heating.

 

 

 

 

No gas at main burners.

Check gas line for air and purge as necessary. After purging gas

 

 

 

 

line of air, allow gas to dissipate for at least 5 minutes before

 

 

 

 

attempting to re---light unit.

 

 

 

Water in gas line.

Drain water and install drip.

Inadequate Heating.

Dirty air filters.

Replace air filters.

 

 

 

Gas input too low.

Check gas pressure at manifold. Refer to gas valve adjustment in

 

 

 

 

the Service section.

 

 

 

Occupancy schedule set point set too low.

Check setpoints and adjust if necessary.

 

 

 

Unit undersized for load.

Decrease load or increase of size of unit.

 

 

 

Restricted or low airflow.

Remove restriction, verify proper fan speed operation, and check

 

 

 

 

SAT compared to the SAT heating limits.

 

 

 

Too much outdoor air.

Check economizer position and configuration. Adjust minimum

 

 

 

 

position if needed using ComfortLink Scrolling Marquee. Verify

 

 

 

 

proper fan speed operation.

 

 

 

Limit switch cycles main burners.

Check rotation of blower and temperature rise of unit. Adjust as

 

 

 

 

needed.

Poor Flame

 

Incomplete combustion (lack of combustion air)

Check all screws around flue outlets and burner compartment.

Characteristics.

results in: Aldehyde odors, CO, sooting flame, or

Tighten as necessary.

 

 

 

floating flame.

 

 

 

 

Cracked heat exchanger, replace.

 

 

 

 

 

 

 

 

Unit is over---fired, reduce input. Adjust gas line or manifold

 

 

 

 

pressure.

 

 

 

 

Check vent for restriction. Clean as necessary.

 

 

 

 

Check orifice to burner alignment.

Burners Will Not Turn Off.

Unit is in Minimum on---time.

Check using ComfortLinkt Scrolling Marquee and the IGC alert

 

 

 

 

flash codes.

 

 

 

Unit running in Service Test mode.

Check using ComfortLinkt Scrolling Marquee.

 

 

 

Main gas valve stuck.

Turn off gas supply and unit power. Replace gas valve.

LEGEND

 

 

 

IGC

-

Integrated Gas Controller

 

SAT

-

Supply Air Temperature

 

34

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Contents Table of Contents Safety Considerations What to do if you smell gasGeneral Basic Control UsageSystem Pilott and Touch Pilot Devices Scrolling Marquee Mode and Menu Display StructureCCN Tables and Display START-UP Evaporator Fan Power SupplyInternal Wiring Condenser Fans and MotorsControls Quick SET-UP Accessories CCN CommunicationFilter Status Setting an Occupied Time Schedule Weekdays Only for 730 toFan Status TimeclockIndependent Outputs Service TestProgramming Operating Schedules Fan TestThird Party Control Controls OperationUnit Configuration ModesGeneral Operating Sequence Occupancy DeterminationCompressor Operation Indoor Fan OperationEconomizer Operation Outdoor Fan OperationUnoccupied Free Cooling Indoor Air Quality IAQ Cooling Modes Cool Supply Air Set Point For units with Enthalpy Control Ventilation ModeFor all units with Economizers Demand Control VentilationHeating Modes Supply-Air Temperature Sensor SAT Gas Heat Start-UpTemp Comp Strt Cool Factr TCS.C Temperature Compensated StartSetting Up the System Temp Comp Strt Heat Factr TCS.HCarrier Comfort Network Ccnr Configuration Demand LimitRestart Procedure TroubleshootingAlarm Handling Complete Unit StoppageAlarms and Alerts Communication FailuresAlert Code T075 Supply Air Temperature Thermistor Failure Alert Code T073 Outdoor Air Temperature Thermistor FailureAlert Code T074 Space Temperature Thermistor Failure Alarm Code A154 Serial Eeprom Hardware FailureAlarm Code A200 Linkage Timeout Comm Failure Alarm Code T155 Serial Eeprom Storage Failure ErrorAlarm Code A156 Critical Serial Eeprom Storage Fail Error Alarm Code A404 Fire ShutdownAlert Code T415 IAQ Input Out of Range Alert Code T416 OAQ Input Out of RangeComfortLink Alarm Codes Cooling Troubleshooting Digital Scroll Controller DSC Troubleshooting Cooling Service AnalysisFlash Code 4 ⎯ Locked Rotor DSC Red LED Flash CodesEconomizer Troubleshooting Economizer Service AnalysisVariable Frequency Drive VFD Troubleshooting Heating TroubleshootingPhase Loss Protection IGC Service Analysis Logic LED IGC Board LED Alarm CodesElectric Heat Service Analysis FlashRefrigerant Temperatures Thermistor TroubleshootingAir Temperatures Thermistor/Temperature Sensor CheckForcing Inputs and Outputs Transducer TroubleshootingSensor Trim Temp Voltage Resistance Drop Temp Voltage Resistance Temp F Drop Degree C Degree F Pressure Voltage Major System ComponentsGeneral Psig48PD Control Wiring Schematic 50PD Control Wiring Schematic 48/50PD Power Wiring Schematic and Legend Typical Unit Component Arrangement Setting Main Base Board MBBMBB Connections FIL.SCenter of the board. Do not change this setting Economizer Control Board ECBECB Connections RM.OCModulation Board AUX1 CommunicationDigital Scroll Control Board DSC CMP.AVariable Frequency Drive VFD Variable Frequency Drive VFDIntegrated Gas Control IGC Board Integrated Gas Control IGC BoardLow Voltage Terminal Strip TB1Scrolling Marquee Display Accessory Navigatort DisplayField-Installed Accessories Carrier Comfort Network Ccnr InterfaceSpace Temperature Sensor T-58 Space Temperature Sensor AveragingSpace Temperature Sensor Averaging Service Periodic Clean Water Rinse CleaningCoil Maintenance and Cleaning Recommendation Routine Cleaning of Round-Tube Coil SurfacesOutdoor-Air Inlet Screens Condensate Drain PanFilters Main Burner 48PDEvaporator Fan Performance Adjustment Evaporator Fan Service and ReplacementLubrication Variable Frequency Drive VFD Replacement Evaporator Fan Belt Tension AdjustmentCondenser-Fan Adjustment Evacuation Economizer Operation During Power FailureVerify Sensor Performance Refrigerant ChargeAltitude Compensation 48PG03-07 Gas Valve AdjustmentPuronR Refrigerant Elevation Natural GAS PropaneFilter Drier High AltitudeMain Burners Protective DevicesRelief Devices Replacement PartsDiagnostic LEDs Compressor Sound ShieldMode RUN Status Appendix a Local Display and CCN TablesOnly StrtAlrmdisp = CCN Generic = CCNMode Temperatures Mode Service TestMode Pressures Mode SET Points Mode InputsMode Outputs OutputsMode Configuration MRT.H HT.TYHTR MOT.HII.CF IA.CFIA.FN II.FNSPT.T TrimSPT.C SAT.CMode Time Clock CCN only TablesMode Operating Modes EN.LO OK.HTACT.H AQ.DVExpansion Range Units Mode AlarmsExpansion Range Default CCN CCN Point CCN Write TABLE/SUB---TABLE StatusAppendix B VFD Information VFD Terminal DesignationsVFD Configurations VFD Modes Standard Display ModeVFD Operation Start Up with AssistantChanged Parameters Mode Parameters ModeStart-Up Assistant Mode Drive Parameter Backup ModeVFD Diagnostics History VFD MaintenanceCorrecting Alarms Heat Sink101---105 Fault Codes201---206 1002 10001001 1003Maintenance Intervals Alarm CodesMaintenance Interval Control Panel Cleaning Main Fan ReplacementBattery Replacement Fan Performance 48PDE05 Vertical Units Appendix C START-UP DataFan Performance 48PDD05 Vertical Units AirflowFan Performance 48PDD06 Vertical Units Available External Static Pressure in. wg Fan Performance 48PDE06 Vertical UnitsRpm Bhp 1500 CFMFan Performance 48PDE05 Horizontal Units Fan Performance 48PDD05 Horizontal UnitsBhp Rpm Fan Performance 48PDD06 Horizontal Units 1026 1086 1144 1199 1253Fan Performance 48PDE06 Horizontal Units Fan Performance 50PD05 Vertical Units Fan Performance 50PD06 Vertical UnitsFan Performance 50PD05 Horizontal Units Bhp Rpm 1500General Notes for FAN Performance Data Tables Appendix D Additional START-UP Data Control SET Point and Configuration LOG Indicate Unit Settings belowCCN Point Entry 103 104 Unit START-UP Checklist PRE-START-UP106

48/50PD05 specifications

The Carrier 48/50PD05 is a remarkable addition to Carrier's lineup of rooftop units, offering advanced cooling and heating solutions for commercial applications. Designed for medium-sized buildings, this unit is well-suited for both new installations and as a replacement for older systems, thanks to its versatile features and efficient performance.

One of the standout features of the 48/50PD05 is its energy efficiency. It incorporates state-of-the-art technology to achieve high Seasonal Energy Efficiency Ratios (SEER) and EER ratings, reducing operational costs while delivering superior comfort. The unit is also compliant with the latest energy regulations, making it an environmentally friendly choice for building owners concerned about sustainability.

The 48/50PD05 is equipped with a highly efficient scroll compressor, which not only enhances performance but also contributes to quiet operation. This is a significant advantage in commercial spaces where noise levels need to be kept in check for comfort and productivity. Additionally, the unit includes advanced airflow design, ensuring even distribution of conditioned air throughout the space.

Technologically, the Carrier 48/50PD05 features Carrier's Infinity Control system, which allows for precise control of indoor climate. This intelligent control mechanism can be integrated with smart building management systems, enabling users to monitor and manage energy use effectively. Wi-Fi connectivity is also available, providing remote access for real-time adjustments and diagnostics.

Durability is another characteristic of the 48/50PD05. Constructed with high-quality materials, the unit withstands various environmental conditions, ensuring longevity and reliability. Moreover, the modular design facilitates easy maintenance, making service procedures efficient and cost-effective.

In addition to cooling, the Carrier 48/50PD05 offers heating capabilities, often utilizing gas or electric heating options that can be tailored to the specific needs of a building. The unit can also be equipped with integrated economizers, allowing for free cooling during suitable outdoor conditions, further enhancing energy savings.

Overall, the Carrier 48/50PD05 stands out as a high-performance HVAC solution that combines efficiency, technology, and durability. It provides building owners with a versatile tool to ensure comfort while minimizing their environmental footprint. With a strong emphasis on energy savings and advanced control features, this rooftop unit is a smart investment for any commercial property.