LEGEND

DPT Ð Discharge Pressure Transducer

EXV Ð Electronic Expansion Valve

OPT Ð Oil Pressure Transducer

SPT Ð Suction Pressure Transducer

T Ð Thermistor Number

Fig. 14 Ð Thermistor and Pressure Transducer Locations

Pressure Transducers Ð A single style of pressure transducer is used for both high- and low-pressure sensing on Flotronic™ II chillers. However, this transducer must be calibrated before the unit will operate. On new units, this will have been done at the factory in order to test run the unit. If a transducer or PSIO is replaced in the ®eld, how- ever, the transducer will have to be ®eld calibrated as follows:

1.Disconnect transducer from the system.

2.Hang the transducer in the atmosphere.

3.Press on the HSIO keypad, and Read the pres- sure. Pressures before calibration must be within the range of 6 5 psig. If the pressure is outside the range of 6 5 psig, the HSIO display will read ---. If this is the case, replace the transducer or PSIO or check for a wir- ing error. If the value of the atmospheric pressure is greater than 5 psig or less than ±5 psig, the transducer will be considered out of range and will not calibrate.

4. Press on the HSIO keypad. This automatically ap-

plies the proper correction factor to all future inputs from the transducer.

Three pressure transducers are mounted on each lead com- pressor: 2 low-pressure transducers to monitor compressor suction pressure and oil pressure, and a high-pressure trans- ducer to monitor compressor discharge pressure (see Fig. 17 for exact locations on compressor). Each transducer is supplied with 5 vdc power from a recti®er which changes 24 vac to 5 vdc.

TROUBLESHOOTING Ð If transducer is suspected of be- ing faulty, ®rst check supply voltage to transducer. Supply voltage should be 5 vdc ± .2 v. If supply voltage is correct, compare pressure reading displayed on keypad and display module against pressure shown on a calibrated pressure gage. If the 2 pressure readings are not reasonably close, replace pressure transducer.

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Carrier 30GN040-420 operating instructions Thermistor and Pressure Transducer Locations
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30GN040-420 specifications

The Carrier 30GN040-420 is a well-regarded model within the industry of chillers, designed to deliver efficient cooling solutions for a variety of commercial applications. Its compact design and advanced technology make it an ideal choice for businesses looking to optimize their HVAC systems.

One of the standout features of the Carrier 30GN series is its flexibility. This chiller model is available in a range of capacities, specifically from 40 to 420 tons, allowing for customized solutions based on specific cooling demands. Such versatility enables this unit to cater to a broad array of installations, from small commercial spaces to larger industrial facilities.

The Carrier 30GN040-420 utilizes a scroll compressor design, known for its reliability and efficiency. The scroll technology allows for a reduction in the number of moving parts, resulting in lower maintenance costs and increased durability. Additionally, the unit operates with environmentally friendly refrigerants such as R-410A, promoting sustainability without compromising performance.

Energy efficiency is another significant aspect of this model. The 30GN series is designed to provide high energy efficiency ratios (EER), which translates to lower operational costs for users over the lifespan of the unit. This is particularly beneficial in an era where energy costs are consistently rising.

The advanced controls found within the Carrier 30GN040-420 further enhance its performance and ease of use. The unit is equipped with a microprocessor-based control system that allows for precise temperature management while providing valuable diagnostic information. This feature not only improves the overall reliability of the system but also facilitates proactive maintenance, reducing the risk of unscheduled downtime.

Moreover, the design of the Carrier 30GN040-420 emphasizes quiet operation, making it suitable for environments where noise levels must be minimized. This characteristic is critical for applications in hospitals, schools, or office buildings, where a peaceful atmosphere is essential.

In summary, the Carrier 30GN040-420 chiller provides a robust solution for businesses requiring dependable and efficient cooling. Its features, including flexible capacity options, reliable scroll compressors, energy-efficient performance, advanced controls, and quiet operation, position it as a top choice for various commercial and industrial applications. As technology continues to evolve, models such as the 30GN series remain at the forefront, meeting the demands of modern HVAC needs while ensuring sustainability and efficiency.
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