Carrier 30HK040-060, 30HW018-040, 30HL050 Capacity Control Steps Ð 30HK, HL Standard Units

Page 31

Once the compressor is shut off, the control system pre- vents the compressor from restarting within 5 minutes of when it was last shut down. Once this period has elapsed and the leaving ¯uid temperature rises above the set point, the com- pressor will start within 5 seconds.

If the unit is equipped with ®eld-installed hot gas bypass, the hot gas bypass valve opens only when stage 1 is active.

If the unit trips out on high pressure, low pressure, ground current (accessory), or low oil pressure, the control module locks the unit off and must be manually reset (turn the ON- OFF switch to OFF and then back to ON). If the unit trips out on low ¯uid temperature, chilled ¯uid ¯ow switch, or chilled ¯uid pump switch, it restarts automatically when the condition is corrected.

30HW UNITS Ð Close the compressor circuit breaker and move ON-OFF switch to the ON position. The switch should light up. In approximately 3 seconds, the compressor starts unloading. For 2 minutes the low-pressure switch is bypassed and the unloaders are energized (compressor un- loads when compressor unloader solenoid is energized). At end of 2-minute bypass period, the low-pressure switch ac- tivates the control circuit and the temperature controller regu- lates the capacity steps based on leaving cooler ¯uid tem- perature, set point and deadband settings on the temperature controller.

If system load drops to the point where the unit is fully unloaded and the ¯uid temperature is below the lower dead- band limit, the compressor shuts off and is not able to restart until the 5-minute anti-short cycle has expired. If during nor- mal operation, the ¯uid temperature rises above the upper deadband limit, the temperature controller adds a step of ca- pacity (assuming a step is left to be added).

On condenserless units (30HWA), or on ¯uid-cooled units (30HWB,C, and S) equipped with the accessory oil safety switch, the control module provides a 2-minute bypass of the oil safety switch.

If the unit is equipped with hot gas bypass option, the hot gas bypass valve closes before unloaders are deactivated.

If the unit trips out on high pressure, ground current (ac- cessory), or low oil pressure, the control module locks the unit off and must be manually reset (by turning the ON-OFF switch to OFF, then back to ON). If the unit trips out on low pressure, low ¯uid temperature, the chilled ¯uid ¯ow switch, or the chilled ¯uid pump switch, it restarts automatically when the condition is corrected.

Table 10 Ð Capacity Control Steps Ð 30HK, HL Standard Units

 

 

TRANSFER SWITCH COMPRESSOR

TRANSFER SWITCH COMPRESSOR

UNIT

CONTROL

 

NO. 1 POSITION*

 

 

NO. 2 POSITION*

 

STEPS

%

 

Operating Cylinder

 

%

 

Operating Cylinder

 

 

 

 

 

 

 

 

Disp.

Total

 

Ckt 1

 

Ckt 2

Disp.

Total

 

Ckt 1

 

Ckt 2

 

1

25

2

 

2

 

Ð

25

2

 

Ð

 

2

30HK040

2

50

4

 

2

 

2

50

4

 

2

 

2

3

75

6

 

4

 

2

75

6

 

2

 

4

 

 

 

 

 

 

4

100

8

 

4

 

4

100

8

 

4

 

4

 

1

40

4

 

4

 

Ð

20

2

 

Ð

 

2

30HK,HL050

2

60

6

 

4

 

2

60

6

 

4

 

2

3

80

8

 

6

 

2

80

8

 

4

 

4

 

 

 

 

 

 

4

100

10

 

6

 

4

100

10

 

6

 

4

 

1

33

4

 

4

 

Ð

33

4

 

Ð

 

4

30HK,HL060

2

66

8

 

4

 

4

66

8

 

4

 

4

3

88

10

 

6

 

4

88

10

 

4

 

6

 

 

 

 

 

 

4

100

12

 

6

 

6

100

12

 

6

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEGEND

Ckt Ð Circuit

Disp. Ð Displacement

*Manually operated.

NOTE: Circuits are designated from left to right when viewed from front of unit.

31

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Contents Contents Installation, Start-Up Service InstructionsGeneral Safety Considerations30HW Units InstallationRig and Place Unit Place the UnitSAE TOP ViewLeft Side View UnitTOP View Front View Right Side View 30HL050,060 CondenserlessRear View Left Side View 30HWB 30HWB018-040 Fluid Cooled30HWC,S Left Side View Front View30HWA,B 30HWC,S Weight Distribution AT Each Mounting HOLE, 60 HZ UnitsWeight Distribution AT Each Mounting HOLE, 50 HZ Units Location of Mounting HolesCooler HWBHWC,S CompressorRefrigerant 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 EndsCooler Pressure Drop Ð 30HK, HL Units Minimum Cooler and Condenser Flow Rates Minimum Loop VolumeUnit Size Cooler Condenser Minimum Cooler Loop VOLUME² Cooler Pressure Drop Ð 30HW UnitsCondenser Pressure Drop Ð Page LRA MTA Ð Electrical Data Ð 30HK, HWB, HWC, HWS Fluid-Cooled UnitsUnit Size ICFÐ Electrical Data Ð 30HL and HWA Condenserless Units GCS Field Accessory WiringCWP DLSTOR COMEquip GNDHPS PRIHGS SECNeut PRE-START-UPInitial Check Electric Shock HazardCheck Refrigerant Charge Deadband SettingTypical Deadband Requirements To ADD OIL START-UP and OperationOperating Limitations Check Refrigerant Feed ComponentsCrankcase Heater Pressure Relief Valve SettingsCompressor and Unit Protective Devices Check Unit SafetiesFactory 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 StepsSteps Cylinders ServiceCapacity Control Steps Ð 30HW Standard Units Unit Capacity Control OperatingThermistor Thermistor REPLACEMENT, 30HK, HL UnitsTemperature Resistance Ohms Ð Sensor Temperature F vs ResistanceÐ Sensor Temperature C vs Resistance Components for Part Number Plugging Servicing Cooler 30HK,HL onlyTightening Cooler Head Bolts Plugs and TubesChilled 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 LeaksUnits Rated MIN. Pressure Drop = Unit Start-UpFluid Entering Cooler Fluid Leaving CoolerBook 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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