NOTES:

1.Values are for a 2° F pressure drop at 125 F (51.7 C) saturated discharge tem- perature, 120 F (48.9 C) saturated condensing temperature, and 105 F (40.6 C) liquid refrigerant temperature.

2.Size each circuit separately.

Fig. 9 Ð R-134a Liquid Line Sizing, 30HXA Units

Table 3 Ð Liquid Line 2 F (1.1 C) Drop in

Saturated Temperature Example

SATURATED

 

PRESSURE

 

 

 

LIQUID

 

 

 

 

 

 

TEMP

R-134a

 

R-22

F

 

C

Psig

kPa

Psig

 

kPa

100

 

37.7

124.3

857

195.9

 

1351

98

 

36.7

120.1

828

190.2

 

1311

D PRESSURE

4.2

29

5.7

 

40

 

 

 

 

 

 

 

 

Discharge lines should be looped above the compressors to avoid having charge ¯owing back to the oil separator and compressor during unit shutdown. Wrap back-pressure valve when brazing discharge line to avoid damaging the valve.

It is recommended that ®eld-supplied pressure relief valves be installed in each discharge line. Most local codes require that the relief valves be vented directly to the outdoors. The vent must not be smaller than the relief valve outlet, and the pressure setting should be 320 psig (2205 kPa).

Run a ®eld-supplied 1¤4-in. (6.4 mm) copper line between the back-pressure valve on the oil separator (bottom pres- sure vessel) to the ®tting on the refrigerant line entering the economizer port of the compressor to measure oil pressure differential. See Fig. 11. The back-pressure valve and the ®t- ting on the refrigerant line have a 1¤4-in. ¯are ®tting for mak- ing this connection. The ¯are nut is ®eld supplied.

IMPORTANT: There is a Schrader-type ®tting in each of the two 1¤4-in. ®ttings. These Schrader-type ®ttings MUST BE REMOVED before running the line.

The 30HXA units are shipped from the factory with a hold- ing charge of R-134a. Before opening the refrigerant sys- tem, relieve system pressure and recover system refrigerant through the charging valve on the cooler.

30HXC CONDENSER CONNECTIONS Ð The inlet fluid connection is always the lower of the 2 condenser con- nections. It is recommended that a screen strainer with a minimum of 20 mesh be installed ahead of the condenser inlet to prevent debris from damaging the internal condenser tubes.

The outlet water connection is the upper connection of the 2 connections. The condenser has weld couplings to connect ®eld-supplied piping. Plan the piping arrangement in accordance with good piping practices and so that the pip- ing does not cross in front of the condenser head. Use ¯ex- ible connections on the condenser piping to reduce vibration transmission. Offset the piping to permit condenser head re- moval for maintenance purposes. Install pipe hangers where needed. Make sure no weight or stress is placed on the water nozzle.

12

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Carrier HXC076-186, 30HXA Saturated Pressure Liquid Temp, 134a Psig KPa 100 37.7 124.3 857 195.9, 36.7 120.1 828 190.2
Page 11 Page 13

30HXA, HXC076-186 specifications

The Carrier 30HXA and 30HXC series is a notable line of chillers designed for commercial applications, providing advanced cooling solutions for various buildings and infrastructures. These models are known for their reliability and efficiency, making them a preferred choice for building managers and facilities engineers.

One of the key features of the Carrier 30HXA and 30HXC series is their use of high-efficiency, variable-speed scroll compressors. This technology allows the chillers to adjust their cooling output based on the actual demand, resulting in significant energy savings, especially during periods of partial load. This responsiveness not only leads to lower operational costs but also reduces wear and tear on the equipment, extending its lifespan.

Another critical aspect of these chillers is their eco-friendly refrigerant options. The 30HXA and 30HXC models utilize R-410A refrigerant, which has a lower environmental impact compared to traditional refrigerants. This commitment to sustainability aligns with modern regulations and climate goals, making these chillers an environmentally responsible choice.

Both series offer a wide range of cooling capacities, from 76,000 to 186,000 BTU/h, catering to various commercial needs. The compact design and modular configurations of these chillers allow for easy installation and integration into existing systems, facilitating retrofits and upgrades without significant disruption.

The 30HXA and 30HXC chillers also feature advanced controls that enhance their operational efficiency. The integrated controls allow for easy monitoring and adjustments, enabling users to optimize performance and minimize energy consumption. Additionally, they can easily interface with building management systems (BMS), providing real-time data and improved operational insights.

Durability is another hallmark of the Carrier 30HXA and 30HXC series. Built with corrosion-resistant materials and designed to withstand harsh weather conditions, these chillers ensure reliable performance in various environments. The robust construction further enhances their longevity, providing consistent cooling solutions for years.

In summary, the Carrier 30HXA and 30HXC series chillers offer advanced technology, eco-friendly refrigerants, energy efficiency through variable-speed compressors, and durable construction. These features come together to provide a reliable and effective cooling solution for a wide range of commercial applications, ensuring comfort and performance while supporting sustainability goals.
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