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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Carrier 30HK040-060, 30HW018-040, 30HL050 specifications Capacity Control Steps Ð 30HK, HL Standard Units
Page 30 Page 32

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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