Carrier 30HL050, 30HW018-040, 060 Troubleshooting, Chilled Fluid PROOF-OF-FLOW Switches Open

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Fig. 24 Ð Elliott Tube Plug

HEAD BOLT TIGHTENING SEQUENCE

Fig. 25 Ð Typical Tube Sheet

TROUBLESHOOTING

Complete Unit Stoppage and Restart Ð Pos- sible causes for unit stoppage and reset methods are (also see Table 14):

GENERAL POWER FAILURE Ð After power is restored, restart is automatic through the normal timer cycle.

UNIT ON-OFF SWITCH IS OPEN Ð When the switch is opened, the unit stops immediately. If the switch is closed immediately after it was opened, the unit restarts automati- cally after the 5-minute timer cycle is completed. If the switch is closed after an extended off-period, the unit restarts au- tomatically in approximately 3 seconds.

CONTACTS OF ANY AUXILIARY INTERLOCKS ARE OPEN Ð After the problem has been corrected, restart is automatic after completion of the 5-minute timer cycle.

CHILLED FLUID PROOF-OF-FLOW SWITCH(ES) OPEN

ÐAfter the problem causing the loss of ¯ow has been cor- rected, restart is automatic after completion of the 5-minute timer cycle.

OPEN LOW-PRESSURE SWITCH Ð If a low-pressure switch remains open for more than 2 minutes during unit operation, the compressor(s) shuts down and is locked off. The unit ser- vice light is illuminated. Determine and correct the cause of the failure. The switch automatically resets, but the unit must be manually reset by cycling the unit control power (move the ON-OFF switch to OFF, then to ON). The unit restarts

after completion of the 5-minute timer cycle unless the re- frigerant charge is either very low or lost. If this is the case, determine the cause of the loss of charge, correct the prob- lem, and recharge the unit before restarting.

TEMPERATURE CONTROLLER SHUTS UNIT DOWN ON OUT-OF-RANGE (See Fig. 21) Ð Check the ther- mistor for an open circuit failure. See Tables 12A and 12B for temperature-resistance values. If thermistor is damaged, replace it. If thermistor is not damaged, the unit restarts automatically after completion of the 5-minute timer cycle, and after the leaving cooler chilled ¯uid temperature rises above the upper deadband limit of the temperature controller.

OPEN HIGH-PRESSURE SWITCH(ES) Ð The unit ser- vice light is illuminated. Determine and correct the cause of the failure. The switch(es) automatically resets but the unit must be manually reset by cycling the control power (move ON-OFF switch to OFF, then back to ON). The unit restarts after completion of 5-minute timer cycle.

OPEN COMPRESSOR INTERNAL THERMAL PROTEC- TION (30HW UNITS) Ð This is compressor overtempera- ture protector on 30HW018 units and the discharge gas ther- mostat (DGT) on 30HW025-040 units. The unit service light is illuminated. Determine and correct cause of problem. The switch resets automatically but unit must be reset by cycling the control power (move ON-OFF switch to OFF, then back to ON). The unit restarts after completion of 5-minute timer cycle.

OPEN OIL PRESSURE SWITCH Ð If oil pressure switch(es) opens for more than 2 minutes during unit operation, the unit shuts down and is locked off. The unit service light is illu- minated. Determine and correct cause of failure. Unit must be reset by cycling the control power (move ON-OFF switch to OFF, then back to ON). Unit restarts after completion of 5-minute timer cycle.

OPEN CONTACTS ON COMPRESSOR GROUND- CURRENT SENSOR(S) (Accessory) Ð The light-emitting diode (LED) on the ground current accessory board (located in ®eld control wiring section of control box) is illuminated. See Fig. 17-20. Unit service light is also illuminated. Check the compressor motor windings for a short to ground. Determine and correct cause of the failure. The unit must be reset by cycling the control power (move ON-OFF switch to OFF, then back to ON). Unit restarts after completion of the 5-minute timer cycle.

OPEN 24-V CONTROL CIRCUIT BREAKER(S) Ð De- termine the cause of the failure and correct. Reset circuit breaker(s). Restart is automatic after completion of 5-minute timer cycle.

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Contents Contents Installation, Start-Up Service InstructionsGeneral Safety ConsiderationsRig and Place Unit InstallationPlace the Unit 30HW UnitsLeft Side View TOP ViewUnit SAETOP View Front View Right Side View 30HL050,060 CondenserlessRear View Left Side View 30HWB 30HWB018-040 Fluid Cooled30HWC,S Left Side View Front ViewWeight Distribution AT Each Mounting HOLE, 50 HZ Units Weight Distribution AT Each Mounting HOLE, 60 HZ UnitsLocation of Mounting Holes 30HWA,B 30HWC,SHWC,S HWBCompressor CoolerRefrigerant Ð kg Ð Physical Data 30HL, HWA Condenserless Units Ð SI Ð Physical Data 30HL, HWA Condenserless Units Ð EnglishCondenser Connections Factory-Installed Unit Wheels Typical Piping with Fluid-Cooled 30HWB Unit Shown Page Cooler Description Installed Coupling Fastening Grooved Pipe EndsUnit Size Cooler Condenser Minimum Cooler Loop VOLUME² Minimum Cooler and Condenser Flow Rates Minimum Loop VolumeCooler Pressure Drop Ð 30HW Units Cooler Pressure Drop Ð 30HK, HL UnitsCondenser Pressure Drop Ð Page Unit Size Ð Electrical Data Ð 30HK, HWB, HWC, HWS Fluid-Cooled UnitsICF LRA MTAÐ Electrical Data Ð 30HL and HWA Condenserless Units CWP Field Accessory WiringDLS GCSEquip COMGND TORHGS PRISEC HPSInitial Check PRE-START-UPElectric Shock Hazard NeutCheck Refrigerant Charge Deadband SettingTypical Deadband Requirements Operating Limitations START-UP and OperationCheck Refrigerant Feed Components To ADD OILCompressor and Unit Protective Devices Pressure Relief Valve SettingsCheck Unit Safeties Crankcase HeaterFactory Settings, Low-Pressure Switch Fixed Factory Settings, High-Pressure Switch FixedCapacity Control and Operating Sequence Ð Unit OperationFREEZE-UP Protection Capacity Control Steps Ð 30HK, HL Standard Units Transfer Switch Compressor Unit Control No Position StepsCapacity Control Steps Ð 30HW Standard Units ServiceUnit Capacity Control Operating Steps CylindersThermistor Thermistor REPLACEMENT, 30HK, HL UnitsTemperature Resistance Ohms Ð Sensor Temperature F vs ResistanceÐ Sensor Temperature C vs Resistance Tightening Cooler Head Bolts Servicing Cooler 30HK,HL onlyPlugs and Tubes Components for Part Number PluggingChilled Fluid PROOF-OF-FLOW Switches Open TroubleshootingHead Bolt Tightening Sequence Symptoms Cause Remedy TroubleshootingCompressor Call for Free Catalog Service TrainingRemove and use for job le Preliminary Information START-UP Checklist for Chiller SystemsPreliminary Equipment Check YES or no Voltage Imbalance LOCATE, REPAIR, and Report ANY R-22 LeaksFluid Entering Cooler Unit Start-UpFluid Leaving Cooler Units Rated MIN. Pressure Drop =Book Catalog No Form 30H-10SI Pg CL-4 11-98

30HK040-060, 060, 30HL050, 30HW018-040 specifications

The Carrier 30HW018-040, 30HL050, 060, and 30HK040-060 series represents a range of advanced rooftop units designed to meet the diverse heating and cooling needs of commercial buildings. Renowned for their efficiency and performance, these units incorporate cutting-edge technologies to improve operational effectiveness and reduce energy consumption.

One of the standout features of the Carrier 30HW series is its high-efficiency scroll compressors, which are engineered to provide exceptional cooling capacity while minimizing energy usage. These compressors operate quietly and ensure smooth performance across varying loads. Additionally, the units utilize advanced microprocessor controls that enhance system efficiency by enabling precise temperature regulation and optimizing energy consumption based on real-time weather conditions.

Another important aspect of the 30HL series is its ability to provide reliable heating and cooling capabilities even in extreme weather conditions. With robust heat exchangers and a range of variable-speed fans, these units can efficiently circulate air while maintaining optimal indoor comfort levels. Variable-speed technology not only enhances comfort but also improves energy savings, as the system can adjust its output based on occupancy and external temperature fluctuations.

The 30HK series, specifically designed for high-performance applications, features enhanced filtration systems which improve indoor air quality. These systems are capable of accommodating various filter types, ensuring that airborne contaminants are effectively captured. This makes the 30HK a suitable choice for environments where air quality is a priority, such as schools, hospitals, and commercial offices.

Moreover, all units in the 30HW, 30HL, and 30HK series are designed with ease of maintenance in mind. Removable panels and easy access points allow for quick servicing and reduces downtime. The compact design also ensures that installation is straightforward, making them a preferred choice for many contractors.

In summary, Carrier's 30HW018-040, 30HL050, 060, and 30HK040-060 series are integral solutions in the HVAC market, combining energy efficiency, advanced controls, and superior air quality features. These rooftop units are tailored for commercial applications, providing reliable heating and cooling solutions while prioritizing comfort and sustainability. Through continuous innovation, Carrier remains at the forefront of HVAC technology, ensuring that their products meet the evolving demands of the industry.
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