The cooler ¯uid inlet and outlet connections are grooved- end. On 30HW units, the ¯uid enters at the top connection and leaves at the bottom connection. Procedures for making the grooved-end connections are the same as for the 30HWB condensers. See 30HWB Condenser section on page 16 for more details.

Run the pump for 10 minutes, then clean the strainer be- fore starting the unit.

A cooler ¯ow switch must be ®eld-installed on all units. This should be a differential pressure switch that is installed between the cooler ¯uid inlet and outlet. The switch should be set to open when the cooler ¯uid ¯ow drops below the values shown in Table 3. Use the cooler water pressure drop curves (Fig. 16) to determine correct setting for each unit size. Use Carrier accessory ¯ow switch, part number 30HW900003. See Table 3 for Minimum Flow rates and loop volumes.

See Step 6 Ð Make Electrical Connections section on page 19 for ¯ow switch wiring details.

30HK, HL Units Ð The thermistor used for sensing ¯uid temperature is factory-installed in the cooler leaving ¯uid line.

30HW Units Ð The thermistor used for sensing the ¯uid temperature is inside the cooler leaving-water cavity.

COOLER PRESSURE DROP Ð 30HW UNITS

Table 3 Ð Minimum Cooler and Condenser Flow

Rates Minimum Loop Volume

UNIT SIZE

COOLER

CONDENSER*

MINIMUM COOLER

 

 

 

 

LOOP VOLUME²

 

Gal./Min

L/s

Gal./Min

L/s

Gal.

L

30HK040

56.0

3.5

67

4.23

120

454.2

30HK,HL050

68.0

4.3

76

4.79

148

560.2

30HK,HL060

68.0

4.3

83

5.24

174

658.6

30HW018

22.5

1.4

22.5

1.4

44

167

30HW025

30.0

1.9

30.0

1.9

59

223

30HW028

37.5

2.4

37.5

2.4

76

288

30HW035

45.0

2.8

45.0

2.8

85

322

30HW040

57.0

3.6

57.0

3.6

113

428

LEGEND

ARI Ð Air Conditioning and Refrigeration Institute

NÐ Liters per kW

V Ð Gallons per ton

*30HK, HWB, HWC and HWS only. ²Minimum system ¯uid volumes.

NOTES:

Gallons = V x ARI capacity in tons.

Liters = N x ARI capacity in kW.

APPLICATION

V

N

Normal Air Conditioning

3

3.25

Process Type Cooling

6 to 10

6.5 to 10.8

Low Ambient Operation

6 to 10

6.5 to 10.8

COOLER PRESSURE DROP Ð 30HK, HL UNITS

NOTE: Ft of water = 2.31 x change in psig.

Fig. 16 Ð Cooler and Condenser Water Pressure Drop

17

Page 17
Image 17
Carrier 30HL050, 060 Minimum Cooler and Condenser Flow Rates Minimum Loop Volume, Cooler Pressure Drop Ð 30HW Units

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.