LEGEND

 

CB

Ð Circuit Breaker

 

CGF

Ð

Ground Fault Module

 

COMM

Ð Communications Bus

 

CR

Ð Compressor Contactor Relay

 

DSIO

Ð

Relay Module (Low Voltage)

*And associated modular units.

HPS

Ð

High-Pressure Switch

 

LV

Ð

Low Voltage

 

PL

Ð

Plug

 

SNB

Ð

Snubber

 

TB

Ð

Terminal Block

 

TRAN

Ð

Transformer

 

U

Ð Unloader

 

Fig. 11C Ð 24-V Safety Circuit Wiring (130-210 and Associated Modular Units)

Loss of communication can be attributed to a grounded transformer with a secondary voltage of 21 vac supplying the PSIO, DSIO-LV, or 4 IN/4 OUT; the 12.5-vac trans- former supplying the DSIO-EXV module, or the 24-vac trans- former supplying PS1 for the transformers. These transformers should not be grounded, or serious damage to controls can result. Check to be sure the transformers are not grounded.

Code 36 Low refrigerant pressure, Circuit A (alert) Code 37 Low refrigerant pressure, Circuit B (alert)

If suction pressure transducer senses a pressure below set point for more than 5 minutes at start-up or more than 2 minutes during normal operation, affected circuit shuts down without going through the pumpout process. Reset is auto- matic when pressure reaches 10 psig above set point if there have been no previous occurrences of this fault on the same day. If this is a repeat occurrence on same day, then reset is manual, with LOCAL/ENABLE-STOP-CCN switch. Fac- tory con®gured set point is 27 psig for standard chillers and 12 psig for brine chillers.

Possible causes of fault are low refrigerant charge, faulty EXV, plugged ®lter drier, or faulty transducer.

Code 38 Failure to pump out, Circuit A (alert) Code 39 Failure to pump out, Circuit B (alert)

The pumpout process is terminated when saturated suc- tion temperature is 10° F (5.6° C) below temperature at be- ginning of pumpout, or 10° F (5.6° C) below leaving water temperature or reaches a saturated suction temperature of ±15 F (±26 C). If appropriate saturated suction temperature is not met within 3 minutes (on 2 consecutive tries), circuit shuts down without pumpout. Reset is manual with LOCAL/ ENABLE-STOP-CCN switch, and start-up follows normal sequence.

Possible causes for this alarm are a bad thermistor or trans- ducer or a faulty expansion valve.

Code 40 Low oil pressure, Circuit A (alert) Code 41 Low oil pressure, Circuit B (alert)

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Carrier 30GN040-420 operating instructions Cgf
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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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