Carrier 30GN040-420 operating instructions Example 3 Ð Using Test Function, Reset Set Points

Page 38

Keypad entry allows the operator to make the

following checks by using :

·LID display check. Proper display is 8.8.8.8.8.8.8.8.

·Operation of alarm relay.

·Operation of condenser fans.

·Operation of chilled ¯uid pump.

·Operation of liquid line solenoids.

·Operation of the hot gas bypass relays.

·Operation of EXVs. To drive EXV fully open, enter

(100% open). To drive EXV fully closed, en-

ter (0% open).

·Operation of each remote alarm.

·Operation of Motormaster signals.

Keypad entry accesses the compressor and compressor unloader operational tests.

During compressor operational tests, compressor starts and runs for 10 seconds. Compressor service valves must be open. Energize crankcase heaters 24 hours prior to performing compressor tests.

Since test function checks only certain outputs, it is good practice to also check all inputs and outputs accessible

through the status function. These are located at

,

, and

(see Table 9). If keypad is not used

for 10 minutes, unit automatically leaves test function and resumes rotating display. See Example 3.

Example 3 Ð Using Test Function

KEYPAD

DISPLAY

COMMENTS

 

ENTRY

RESPONSE

 

 

 

 

 

 

 

COMP

Factory/®eld test of compressors

 

 

 

subfunction of test function

 

 

CPA 1

OFF

Circuit A, Compressor 1A test

 

 

CPA 1

ON

Pressing ENTR starts the test:

 

 

 

 

when the compressor should be running

 

 

 

the display shows CPA1 on

 

 

CPA 1

OFF

If the test is allowed to time out (10 sec-

 

 

 

onds) the display will show CPA1 off

 

CPA 2

OFF

Pressing the down arrow key advances the

 

 

 

system to Circuit A, compressor 2 test

 

 

 

 

NOTE: Once a compressor has been run using the

function,

it is not allowed to run again for 30 seconds.

accesses the transducer calibration subfunction.

All transducers must be calibrated in order for the unit to operate. Refer to Pressure Transducers section on page 60 for calibration procedure.

HISTORY FUNCTION Ð Pressing and dis-

plays total unit run time, total run time for each circuit, and total run time for each compressor.

Pressing and displays total unit starts, the total starts for each circuit, and total starts for each com-

pressor. Pressing

and

displays the last 10 alarms

along with a description of each alarm.

SET POINT FUNCTION Ð Set points are entered through the keypad. Set points can be changed within the upper and lower limits, which are ®xed. The ranges are listed below.

Chilled Fluid Set Point

Water:

38 to 86 F (3.3 to 30 C)

Medium Brine:

14 to 86 F (±10 to 30 C)

Pulldown Set Point

0.2 to 2.0 F (0.11 to 1.1 C)/min.

Reset Set Points

Maximum Reset Range:

±30° to 30° F (±17° to 17° C)

External Temperature Reset ±40 to 240 F (±40 to 118 C)

Chiller Fluid DT: 0° to 15° F (0° to 8° C)

External Signal Reset 4 to 20 mA

Demand Limit Set Points

Switch Input:

Step 1 Ð 0 to 100% Capacity Reduction

Step 2 Ð 0 to 100% Capacity Reduction

External Signal:

Maximum Demand Limit 4 to 20 mA

Minimum Demand Limit 4 to 20 mA

Loadshed Demand Delta: 0 to 60%

Maximum Loadshed Time: 0 to 120 min.

Set points are grouped in subfunctions as follows:

Subfunction displays chiller ¯uid set points.

a.The ®rst value shown is the occupied chilled ¯uid set point.

b.The next value displayed depends on how the sched- ule function has been programmed. (See pages 44- 47.) If dual set point has been selected, the next set

point after has been pressed is the second chilled ¯uid set point. If single set point or inactive sched-

ule

has been

selected in

the

schedule

function,

then

when

is pressed,

the

display

shows the

head pressure set points, one for each circuit. These are utilized only if the set point controlled method of

head pressure control is selected in .

c. The ®nal value displayed when the is pressed

is the cooling ramp loading rate. This is the maximum rate at which the leaving chilled ¯uid is allowed to drop, and can be ®eld set from 0.2 to 2.0 F (.11° to 1.1° C)/minute. This value is not displayed unless the function is enabled (see Adjustable Field Con®gura- tions on page 44).

Reading and Changing Set Points Ð Example 4 shows how to read and change the chilled ¯uid set point. Other set points can be changed by following the same procedure. Refer to Table 9 for the sequence of display of set points in each sub- function.

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Contents Controls, Operation, Troubleshooting Tons Unit 30GN Unit Sizes and Modular CombinationsUnit Model Nominal Section a Section B 30GN Control Panel 040-110 Unit Shown Keypad and Display Module Also Called Hsio LOCAL/ENABLE-STOP-CCN Switch Positions and OperationLOCAL/ENABLE StopThermistors Compressor Protection Control Module CpcsThermistor and Transducer Locations Pressure TransducersSteps Ð Capacity Control StepsLoading Sequence a Loading Sequence B Unit Control Ð Capacity Control Steps, 040-070 Ð Capacity Control Steps, 040-070 A1²**, B1² Displacement Compressors Approx 080, 230B 60 HzA1²,B1² A1²**,B1²090, 245B 50 Hz Compressors Displacement090, 245B 60 Hz 100, 255B 270B 60 HzUnit Control Loading Sequence a Loading Sequence B 270B 50 Hz315B 50 Hz 110, 290B315B 60 Hz A1*,A2,B1 A1,A2,B1 A1²²,A2,B1,B2 A1*,A2,B1,B2 130 60 Hz 130 50 Hz 150, 230A, 245AA1,kB1 170, 270A 330A/B 60 Hz330A/B,360B 50 Hz 330A/B, 360B 50 Hz A1,B1 Approx 190, 290A, 360A/B390B 60 Hz A1**,B1210, 315A, 390A 420A/B 60 Hz420A/B 50 Hz Head Pressure Control PumpoutCondenser Fan Sequence FAN Arrangement FAN Numbers FAN Contactor Controlled byFunction USE Keys Keypad and Display Module UsageFunctions and Subfunctions Operative USE KeysAccessing Functions and Subfunctions Keypad DirectorySubfunction Keypad Entry Display Comment Stage TemperatureKeypad Directory Status SET PointInputs Subfunction Keypad Entry Display Comment PressureAnalog OutputsSubfunction Keypad Entry Display Comment Compressors Subfunction Keypad Entry Display CommentSubfunction Keypad Entry Display Comment Outputs Unloaders CPA1Keypad Directory Test Keypad Directory Schedule Service Keypad Directory ServiceConfiguration Subfunction Keypad Entry Display Comment FactoryStarts ALARM/ALERTSubfunction Keypad Entry Display Comment RUN Time HISTORY²²Demand SET Points Reset SET PointsSubfunction Keypad Entry Display Comment SET Points Date and TimeKeypad Display Comments Entry Response Example 1 Ð Reading Alarm CodesExample 2 Ð Reading Current Operating Modes Operational and Mode Display Codes Example 3 Ð Using Test Function Reset Set PointsExample 4 Ð Reading and Changing Chilled Fluid Set Point Example 5A Ð External ResetReset Amounts Measurement Method Input Data DescriptionExample 5C Ð Using Return Fluid Temperature Reset Keypad Display Comments Entry ResponseComm Ð Communications Bus PowerSwitch PWRSUB Keypad Display Comment Service FunctionsPassword LoggedonTo Disable Demand Limit Example 8 Ð Setting Time of Day Day of Week4-20 mA Demand Limiting Adjustable Field Congurations Factory Conguration KeystrokesProgramming Period Example 9 Ð Using the Schedule FunctionKeypad Display Comment Entry Keypad Display Comment Entry Programming PeriodExample 10 Ð Holiday Schedule Function Enter DisplayTypical Stoppage Faults and Reset Types Stop position. Unit cannot start if these contacts areAlarm and Alert Codes LOCAL/ENABLE-STOP-CCNWSM CpcsFSM Dsio COM, CommDGT HPSComm CGF Subfunction. Groups Electronic Expansion Valve EXV EXV Cable Connections to EXV Driver Module, Dsio EXV Thermistor Replacement T1, T2, T7, T8 Temperature Voltage Resistance Drop Ohms Temperature Voltage Resistance Drop Thermistor and Pressure Transducer Locations Thermistor Locations Circuits a and B, Lead Compressor Only Lead Compressor Transducer and Thermistor Locations Module Address Selector Switch Locations Control ModulesAccessory Unloader Installation Installation 4 In/4 Out Module SIOTroubleshooting Standard and Accessory UnloadersPage Hgbpr Ð Or HGBPR-A²Or HGBPR-B COMCWP Ð Chilled Water Fluid Pump Externally PoweredOutdoor-Air Temperature TB Ð Terminal BlockRemote Alarm InterlocksPage Copyright 1995 Carrier Corporation

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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