STATUS FUNCTION Ð This function shows the rotating display, current status of alarm and alert (diagnostic) codes, capacity stages, operating modes, chilled water set point, all measured system temperatures and pressures, superheat val- ues, pressure switch positions, analog inputs, and switch in- puts. These subfunctions are de®ned on pages 36 and 37.

(Rotating Display)

(Alarms/Alerts) Ð Alarms and alerts are messages that one or more faults have been detected. Each fault is as- signed a code number which is reported with the alarm or alert. See Table 10 for code de®nitions. The codes indicate failures that cause the unit to shut down, terminate an option (such as reset) or result in the use of a default value as set point.

Up to 10 codes can be stored at once. To view them

in sequence, press

to enter the alarm/alert dis-

plays and then press to move to the individual dis-

plays. Press after a code has been displayed. The mean- ing of the code scrolls across the screen. See Example 1.

Example 1 Ð Reading Alarm Codes

KEYPAD

DISPLAY

COMMENTS

ENTRY

RESPONSE

 

 

TUE 12:45

 

 

LOCAL ON

 

 

CLOCK ON

Keypad has not been used for

 

13 MODE

at least 10 minutes. Alternating

 

8 MODE

summary display appears on

 

COOL 1

screen

 

2 ALARMS

 

 

3 MINS

 

 

2 ALARMS

2 alarms/alerts detected

 

RSAL DSB

Reset all alarms/alerts

 

ALARM 9

First alarm/alert code

 

COOLER LEAVING

 

 

FLUID THERMISTOR

Explanation of alarm/alert code

 

FAILURE

 

 

ALARM 42

Second alarm/alert code.

 

Cooler freeze protection

 

 

 

COOLER FREEZE

Explanation of alarm/alert code

 

PROTECTION

 

 

 

 

 

When a diagnostic (alarm or alert) code is stored in the display and the machine automatically resets, the code is de- leted. Codes for safeties which do not automatically reset are not deleted until the problem is corrected and either the machine is switched to STOP position, then back to LOCAL/ ENABLE or CCN position, or by using the keypad and dis- play module.

To reset alarms/alerts using keypad and display module:

KEYPAD

DISPLAY

COMMENTS

ENTRY

RESPONSE

 

 

 

 

 

RSAL DSB

Reset all alarms/alerts

 

function disabled

 

 

 

RSAL ENB

Reset all alarms/alerts

 

function enabled

 

 

 

 

 

(Modes) Ð The operating mode codes are dis- played to indicate the operating status of the unit at a given time. See Table 10.

To enter the MODES subfunction, press

and

press the key to determine if more than one mode ap- plies. See Example 2 to read current mode with expansion.

Example 2 Ð Reading Current Operating Modes

KEYPAD

 

DISPLAY

COMMENTS

ENTRY

RESPONSE

 

 

TUE 15:45

Keypad has not been used for at

 

LOCAL ON

least 10 minutes. Rotating summary

 

CLOCK ON

display appears on screen

 

8 MODE

 

 

COOL 1

 

 

0 ALARMS

 

 

3

MINS

 

 

2

MODES

There are 2 modes currently in effect

 

LOCAL ON

Unit is on by chiller on/off switch

 

8

MODE

Temperature reset is in effect

 

 

 

 

(Stage) Ð This subfunction displays the capac-

ity stage number. See Tables 4A-4C for compressor loading sequence. To enter the STAGE subfunction, press

and press the to display the stage number.

Continue pressing for the following information:

·Number of requested stages.

·Percent of total unit capacity being utilized.

·Percent of each circuit capacity being utilized.

·Percent of total capacity available.

·Percent of capacity available in each circuit.

·Demand limit set point in effect (can be any value be- tween 0% and 100%).

·Status of each compressor relay. When a compressor is on, the number of that compressor is displayed. If a com- pressor is off, a 0 is displayed. For example: In a given circuit, if compressors 1 and 3 are running, and 2 and 4 are not running, 0301 is displayed for that circuit.

·Load/Unload factor for compressors. This factor is an in- dication of when a step of capacity is added or subtracted. Its value can range from slightly less than ±1.0 to slightly more than +1.0. When load/unload factor reaches +1.0, a compressor is added. When the load/unload factor reaches ±1.0, a compressor is subtracted. If compressor unloaders are used, at ±.6 a compressor is unloaded and at +.6, a compressor is loaded up.

36

Page 36
Image 36
Carrier 30GN040-420 operating instructions Example 1 Ð Reading Alarm Codes, Example 2 Ð Reading Current Operating Modes

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.

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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.