Carrier 48/50PD05 manual Compressor Operation, Indoor Fan Operation

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48/50PD

(Configuration→CCN→SCH.O→OV.SP) is set to YES. The length of the override period is determined by the

Timed Override Hours setting (Configuration→CCN→SCH.O→OV>EX).

Compressor Operation

The 48/50 PD units use a Copeland Digital Scroll Compressor that can vary the refrigerant capacity between 100 and 15%. This is accomplished by a mechanism in the compressor that separates the two scroll spirals which stops the pumping of the refrigerant gas. This mechanism is operated by the differential pressure between the suction and discharge of the compressor. The pressure to operate the unloading mechanism is controlled by a small solenoid situated in a refrigerant line between the top of the compressor and the suction line. When the solenoid is energized the compressor is unloaded. The solenoid coil is controlled by the Copeland Digital Scroll Controller (DSC) that operates on a 1 to 5V signal from the ComfortLink Auxiliary Board (AUX1) and converts this into a Pulse Width Modulated (PWM) signal to the solenoid valve. The pulse width modulated signal is an on and off signal that repeats every 15 seconds with the off time portion of the 15 seconds representing the % loading of the compressor.

The Compressor Capacity (Outputs→COOL→CAPC) can be monitored on the ComfortLink Scrolling Marquee Display. The Compressor Capacity value is determined by a Proportional, Integral, Derivative (PID) algorithm that controls the Supply Air Temperature (Temperatures→AIR.T→SAT) to the Supply Air Control Point (Run Status→COOL→SA.CP).

The Compressor Minimum Capacity (Configuration→COOL→MIN.C) is configured at the factory to 70%. This is the minimum compressor capacity that gives the highest SEER rating for a 48 series unit with the highest gas heat option and no economizer per AHRI standard 210/240. Since the AHRI rating standard does not account for energy savings that can be realized by displacement ventilation air distribution system and extending economizer cooling operation at higher supply air temperature set points, a complete energy analysis should be conducted before changing the Compressor Minimum Capacity (Configuration→COOL→MIN.C) setting to determine the energy savings at a lower Compressor Minimum Capacity (Configuration→COOL→MIN.C) setting.

Indoor Fan Operation

The indoor fan is controlled by the Indoor Fan VFD Power Relay (Outputs→FANS→IDF) on the MBB (main base board) control, which then operates the indoor fan contactor (IFC). On the 48/50PD units the Indoor Fan VFD Power Relay (Outputs→FANS→IDF) is always on so that power is supplied to the VFD electronic boards. This prevents the formation of condensation on the VFD electronic boards and provides power to the remote VFD display so that error codes and VFD configuration parameters can be verified.

The 48/50PD unit controls require an accurate supply duct CFM at the unit design point where the indoor fan will run at the Supply Fan Maximum Speed (Configuration→UNIT→FS.MX). The Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) is used for operation of the economizer and power exhaust. The supply duct CFM is configured by the Indoor Fan Max Speed CFM (Configuration→ECON→IDF.C). Default values for Indoor Fan Max Speed CFM (Configuration→ECON→IDF.C) are at 400 CFM per ton or 1600 CFM for the 05 size and 2000 CFM for the 06 size. It is preferred to use the supply duct CFM from an air balance report to configure the Indoor Fan Max Speed CFM (Configuration→ECON→IDF.C). If an air balance report is not available then use the fan tables supplied in this book to

determine Fan Max Speed CFM (Configuration→ECON→IDF.C). When using the fan tables to

determine Fan Max Speed CFM (Configuration→ECON→IDF.C) set Economizer Position Test

(Service Test→INDP→ECON) to 0 (Economizer Damper Closed) and Indoor Fan Speed Test (Service Tes→FANS→F.SPD) equal to (Configuration→UNIT→FS.MX). Measure the supply to return duct static pressure difference and indoor fan RPM. Make correction to static pressure for all options installed in the unit per the accessory pressure drop table. Determine Indoor Fan Max Speed CFM (Configuration→ECON→IDF.C) on the fan table where the corrected static pressure and RPM cross.

The supply fan speed range is configured by the Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) and the Supply Fan Minimum Speed (Configuration→UNIT→FS.MN). These configuration values are in units of % speed referenced to a 2 to 10VDC signal to the VFD AI1 input with 2VDC representing 0% speed and 10VDC representing 100% speed or 0 to 60HZ VFD frequency output to the motor.

The Supply Fan Minimum Speed (Configuration→UNIT→FS.MN) can be user configured between 10 and 70%. The Supply Fan Minimum Speed default value is 70%, this provides the greatest energy efficiency rating for a unit without an economizer in a mixed air type duct application.

The Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) can be configured between 80 and 100%. The Supply Fan Maximum Speed default value is 100%. Set the indoor fan pulley to the application design point CFM for heating and cooling at 100% fan speed so that the CFM is not lower than the minimum CFM allowed in the product data. If the exact CFM can not be set by the half turn pulley settings then

adjust the Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) to fine tune the CFM to the application requirements. The Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) RPM must now produce supply CFM that is not lower that the minimum CFM allowed in the product data for heating and cooling.

The indoor fan may operate during cooling with compressors mode, free cooling with outdoor air mode, heating mode, or for ventilation with outdoor air mode.

The indoor fan operation can be affected by the following:

SFan On When Occupied (Configuration→UNIT→OC.FN) S IAQ Analog Fan Config (Configuration→AIR.Q→IA.FN) S IAQ Switch Fan Config (Configuration→AIR.Q→II.FN) S Fan Status Switch (Configuration→UNIT→FN.SW)

When the unit is in occupied or unoccupied cooling mode the supply fan will modulate to maintain the space temperature sensor set point between the configured Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) and the Supply Fan Minimum Speed (Configuration→UNIT→FS.MN).

When the 40PD or 50 PD unit is in occupied or unoccupied heating mode (gas heat or electric heat mode) the indoor fan will operate at the Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) setting.

For 48PD gas heating units, the IGC control fan output is also monitored by the MBB control. This can result in additional modifications of fan delays or other operation due to safety functions of the IGC control.

When the PD unit is in free cooling mode the indoor fan will modulate to maintain The Occupied Cool Set Point (Setpoints→OCSP), the Unoccupied Cool Set Point

(Setpoints→UCSP), Occupied Heat Set Point (Setpoints→OHSP), or the Unoccupied Heat Set Point

(Setpoints→UHSP).

When the PD unit is in ventilation mode and Fan On When Occupied (Configuration→UNIT→OC.FN) the indoor fan will

operate at the Vent Mode Fan Speed (Configuration→UNIT→FS.VM). Vent Mode Fan Speed

(Configuration→UNIT→FS.VM) factory default is 50% and can be user configured between 40 and 100%.

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Contents Table of Contents Safety Considerations What to do if you smell gasGeneral Basic Control UsageCCN Tables and Display Scrolling Marquee Mode and Menu Display StructureSystem Pilott and Touch Pilot Devices 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 OperationUnoccupied Free Cooling Outdoor Fan OperationEconomizer Operation 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 AnalysisPhase Loss Protection Heating TroubleshootingVariable Frequency Drive VFD Troubleshooting IGC Service Analysis Logic LED IGC Board LED Alarm CodesElectric Heat Service Analysis FlashRefrigerant Temperatures Thermistor TroubleshootingAir Temperatures Thermistor/Temperature Sensor CheckSensor Trim Transducer TroubleshootingForcing Inputs and Outputs 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 48PDLubrication Evaporator Fan Service and ReplacementEvaporator Fan Performance Adjustment Condenser-Fan Adjustment Evaporator Fan Belt Tension AdjustmentVariable Frequency Drive VFD Replacement 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 Pressures Mode Service TestMode Temperatures 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 Sink201---206 Fault Codes101---105 1002 10001001 1003Maintenance Interval Alarm CodesMaintenance Intervals Battery Replacement Main Fan ReplacementControl Panel Cleaning 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 CFMBhp Rpm Fan Performance 48PDD05 Horizontal UnitsFan Performance 48PDE05 Horizontal Units 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.
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