Carrier 30GN040-420 operating instructions Typical Stoppage Faults and Reset Types

Page 48

Unit Shutoff Ð To shut unit off, move LOCAL/ENABLE- STOP-CCN switch to STOP position. Any refrigeration cir- cuit operating at this time continues to complete the pum- pout cycle. Lag compressors stop immediately, and lead compressors run to complete pumpout.

Complete Unit Stoppage Ð Complete unit stoppage can be caused by any of the following conditions:

1.

Cooling load satis®ed

2.

Remote on/off contacts open

3.

Programmed schedule

4.

Emergency stop command from CCN

5.

General power failure

6.

Blown fuse in control power feed disconnect

7.

Open control circuit fuse

If stoppage occurs more than once as a result of any of the above safety devices, determine and correct the cause before attempting another restart.

Restart Procedure Ð After cause for stoppage has been corrected, restart is either automatic or manual, depending on fault. Manual reset requires that LOCAL/ENABLE- STOP-CCN switch be moved to STOP position, then back to original operating position. Some typical fault conditions are described in Table 15. For a complete list of fault con- ditions, codes, and reset type, see Table 16.

Table 15 Ð Typical Stoppage Faults and Reset Types

8.

LOCAL/ENABLE-STOP-CCN switch moved to STOP

 

position

9.

Freeze protection trip

10.

Low ¯ow protection trip

11. Open contacts in chilled water ¯ow switch (optional)

12.

Open contacts in any auxiliary interlock. Terminals that

 

are jumpered from factory are in series with control switch.

 

Opening the circuit between these terminals places unit

 

in stop mode, similar to moving the control switch to

 

STOP position. Unit cannot start if these contacts are

 

open. If they open while unit is running, unit pumps down

Chilled Fluid, Low Flow Chilled Fluid, Low Temperature

Chilled Fluid Pump Interlock

Control Circuit Fuse Blown

High-Pressure Switch Open

Low Refrigerant Pressure

Low Oil Pressure

Discharge Gas Thermostat Open

Manual reset

Auto reset ®rst time, manual if repeated in same day

Manual reset

Unit restarts automatically when power is restored

Manual reset

Auto reset ®rst time, then manual if within same day

Manual reset Manual reset

 

and stops.

13.

Cooler entering or leaving ¯uid thermistor failure

14.

Low transducer supply voltage

15.

Loss of communications between processor module and

 

other control modules

16.

Low refrigerant pressure

17.

Off-to-on delay is in effect.

Single Circuit Stoppage Ð Single circuit stoppage can be caused by the following:

1.Low oil pressure in lead compressor

2.Open contacts in lead compressor high-pressure switch

3.Low refrigerant pressure

4.Thermistor failure

5.Transducer failure

6.Ground fault in lead compressor indicator (indicator is ®eld-supplied on 040-060, 070 [60 Hz], and 080-110 and associated modular units)

7.High suction superheat

8.Low suction superheat

9.Lead compressor circuit breaker trip. Stoppage of one circuit by a safety device action does not affect other circuit. When a safety device trips on a lead compres- sor, circuit is shut down immediately and EXV closes.

10.Ground fault for any circuit compressor (130-210 and associated modular units).

Lag Compressor Stoppage Ð Lag compressor stop- page can be caused by the following:

1.Open contacts in high-pressure switch

2.Compressor ground fault (indicator is ®eld-supplied on 040-060, 070 [60 Hz], and 080-110 and associated modu- lar units)

3.Compressor circuit breaker trip

4.Not required to run to meet cooling load requirement

POWER FAILURE EXTERNAL TO THE UNIT Ð Unit restarts automatically when power is restored.

Alarms and Alerts Ð These are warnings of abnormal or fault conditions, and may cause either one circuit or the whole unit to shut down. They are assigned code numbers as described below. These code numbers are displayed

on the HSIO when the subfunction is entered. A

fault that affects one one circuit of the chiller will generate an alert, and a fault that affects the entire unit will generate an alarm.

Following is a detailed description of each alarm and alert code error and possible cause. Manual reset is accomplished by moving LOCAL/ENABLE-STOP-CCN Switch to STOP position, then back to LOCAL or CCN position. See Table 16 for listing of each alarm and alert code.

Code 0 No alarms or alerts exist Codes 1 - 8 Compressor failure

If DSIO-LV or -EXV relay module control relay feedback switch or signal is sensed as open during operation of a com- pressor, microprocessor detects this and stops compressor, energizes alert light, and displays a code of 1, 2, 3, 4, 5, 6, 7, or 8 depending on the compressor. Compressor locks off; to reset, use manual reset method.

If lead compressor in a circuit shuts down, the other com- pressors in the circuit stop and lock off. Only the alert mode for lead compressor is displayed.

The microprocessor is also programmed to indicate com- pressor failure if feedback terminal on DSIO-LV or -EXV J3 terminal strip receives voltage when compressor is not sup- posed to be on.

NOTE: It takes 5 seconds for the control to generate the alarm code and lock out the compressor(s) on compressor failure code(s) 1 through 8.

48

Page 47 Page 49
Image 48
Page 47 Page 49
Contents Controls, Operation, Troubleshooting Unit Sizes and Modular Combinations Unit Model Nominal Section a Section BTons Unit 30GN 30GN Control Panel 040-110 Unit Shown LOCAL/ENABLE-STOP-CCN Switch Positions and Operation LOCAL/ENABLEKeypad and Display Module Also Called Hsio StopCompressor Protection Control Module Cpcs Thermistor and Transducer LocationsThermistors Pressure TransducersÐ Capacity Control Steps Loading Sequence a Loading Sequence B Unit ControlSteps Ð Capacity Control Steps, 040-070 Ð Capacity Control Steps, 040-070 Displacement Compressors Approx 080, 230B 60 Hz A1²,B1²A1²**, B1² A1²**,B1²Compressors Displacement 090, 245B 60 Hz090, 245B 50 Hz 100, 255B 270B 60 HzUnit Control Loading Sequence a Loading Sequence B 270B 50 Hz110, 290B 315B 60 Hz315B 50 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 Approx 190, 290A, 360A/B 390B 60 HzA1,B1 A1**,B1210, 315A, 390A 420A/B 60 Hz420A/B 50 Hz Head Pressure Control PumpoutCondenser Fan Sequence FAN Arrangement FAN Numbers FAN Contactor Controlled byKeypad and Display Module Usage Functions and SubfunctionsFunction USE Keys Operative USE KeysAccessing Functions and Subfunctions Keypad DirectoryTemperature Keypad Directory StatusSubfunction Keypad Entry Display Comment Stage SET PointSubfunction Keypad Entry Display Comment Pressure AnalogInputs OutputsSubfunction Keypad Entry Display Comment Subfunction Keypad Entry Display Comment OutputsSubfunction Keypad Entry Display Comment Compressors Unloaders CPA1Keypad Directory Test Keypad Directory Schedule Keypad Directory Service ConfigurationService Subfunction Keypad Entry Display Comment FactoryALARM/ALERT Subfunction Keypad Entry Display Comment RUN TimeStarts HISTORY²²Reset SET Points Subfunction Keypad Entry Display Comment SET PointsDemand SET Points Date and TimeExample 1 Ð Reading Alarm Codes Example 2 Ð Reading Current Operating ModesKeypad Display Comments Entry Response Operational and Mode Display Codes Example 3 Ð Using Test Function Reset Set PointsExample 5A Ð External Reset Reset AmountsExample 4 Ð Reading and Changing Chilled Fluid Set Point Measurement Method Input Data DescriptionExample 5C Ð Using Return Fluid Temperature Reset Keypad Display Comments Entry ResponsePower SwitchComm Ð Communications Bus PWRService Functions PasswordSUB Keypad Display Comment LoggedonTo Disable Demand Limit Example 8 Ð Setting Time of Day Day of Week4-20 mA Demand Limiting Adjustable Field Congurations Factory Conguration KeystrokesExample 9 Ð Using the Schedule Function Keypad Display Comment EntryProgramming Period 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-CCNCpcs FSMWSM COM, Comm DGTDsio 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 Or HGBPR-A ²Or HGBPR-BHgbpr Ð COMExternally Powered Outdoor-Air TemperatureCWP Ð Chilled Water Fluid Pump 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.
Top Page Image Contents