Table 13 — Operating Limits — 50PCH,PCV Units

OPERATING LIMITS

COOLING (F)

HEATING (F)

AIR LIMITS

 

 

Min. Ambient Air – db

45

39

Rated Ambient Air – db

80.6

68

Max. Ambient Air – db

110

85

Min. Entering Air – db/wb

50

40

Rated Entering Air – db/wb

80.6/66.2

68

Max. Entering Air – db/wb

110/83

80

WATER LIMITS

 

 

Min. Entering Water

30

20

Normal Entering Water

50-110

30-70

Max. Entering Water

120

90

Normal Water Flow

2.5-3.0 gpm per ton

LEGEND

 

 

db — Dry Bulb wb — Wet Bulb

Scroll Compressor Rotation — It is important to be certain compressor is rotating in the proper direction. To determine whether or not compressor is rotating in the prop- er direction:

1.Connect service gages to suction and discharge pressure fittings.

2.Energize the compressor.

3.The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

1.Turn off power to the unit. Install disconnect tag.

2.Reverse any two of the unit power leads.

3.Reapply power to the unit and verify pressures are correct.

The suction and discharge pressure levels should now move to their normal start-up levels.

When the compressor is rotating in the wrong direction, the unit makes more noise and does not provide cooling.

After a few minutes of reverse operation, the scroll com- pressor internal overload protection will open, thus activating the unit lockout. This requires a manual reset. To reset, turn the thermostat on and then off.

NOTE: There is a 5-minute time delay before the compressor will start.

Unit Start-Up Cooling Mode

1.Adjust the unit thermostat to the warmest position. Slowly reduce the thermostat position until the compres- sor activates.

2.Check for cool air delivery at unit grille a few minutes after the unit has begun to operate.

3.Verify that the compressor is on and that the water flow rate is correct by measuring pressure drop through the heat exchanger using P/T plugs. See Table 14. Check the elevation and cleanliness of the condensate lines; any dripping could be a sign of a blocked line. Be sure the condensate trap includes a water seal.

4.Check the temperature of both supply and discharge wa- ter. Compare to Tables 15-25. If temperature is within range, proceed. If temperature is outside the range, check the cooling refrigerant pressures in Tables 15-25.

5.Check air temperature drop across the coil when com- pressor is operating. Air temperature drop should be between 15 and 25 F.

Table 14 — Water Temperature Change

Through Heat Exchanger

 

COOLING

HEATING

WATER FLOW RATE (GPM)

RISE (F)

DROP (F)

 

Min

Max

Min

Max

For Closed Loop: Ground Source or

9

12

4

8

Cooling/Boiler Systems at 3 gpm/ton

 

 

 

 

For Open Loop: Ground Water Systems at

20

26

10

17

1.5 gpm/ton

 

 

 

 

26

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Carrier Unit Start-Up Cooling Mode, Operating Limits 50PCH,PCV Units, Water Temperature Change Through Heat Exchanger
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50PCH specifications

The Carrier 50PCH is a cutting-edge series of air-cooled chillers designed to deliver exceptional cooling performance in a wide range of commercial applications. Engineered with efficiency and reliability in mind, the 50PCH stands out for its innovative technologies and robust construction, making it a preferred choice for facility managers and HVAC professionals.

One of the main features of the Carrier 50PCH is its advanced scroll compressor technology. This system consists of high-efficiency scroll compressors that optimize energy consumption while maintaining consistent cooling output. The incorporation of variable speed technology enables the chillers to adapt to fluctuating load demands, resulting in significant energy savings and reduced operational costs.

The 50PCH chillers also boast a high energy efficiency ratio (EER) and coefficient of performance (COP), ensuring compliance with stringent energy regulations and standards. They are designed with eco-friendly refrigerants, which contribute to lower greenhouse gas emissions, making them an environmentally responsible choice for modern buildings.

In addition to its energy-efficient operation, the 50PCH series is equipped with advanced controls that allow for seamless integration into building management systems. The intuitive interface facilitates monitoring and adjustment of set points, ensuring optimal comfort conditions. Furthermore, the chillers come with extensive diagnostic capabilities, enabling proactive maintenance and reducing the risk of unexpected downtime.

The robust construction of the 50PCH series enhances durability and reliability. With an all-weather aluminum cabinet, these chillers are designed to withstand harsh environmental conditions, ensuring long-term performance. The units undergo rigorous testing to meet high industry standards for quality and reliability.

Another distinguishing characteristic of the Carrier 50PCH is its whisper-quiet operation. Engineered for low sound levels, these chillers minimize noise pollution in sensitive environments, such as hospitals, schools, or residential areas.

In summary, the Carrier 50PCH series combines exceptional performance, energy efficiency, and innovative technology in a robust and reliable package. It highlights the best in modern HVAC design, making it an ideal solution for a wide array of climate control needs in commercial and institutional settings. With its advanced features and commitment to sustainability, the 50PCH is undoubtedly a leader in the air-cooled chiller market.
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