Carrier Air Conditioner specifications Refrigerant Circuit, Field Wiring

Page 67

Consult application data section in the Product Data litera- ture and job design requirements to determine flow rate re- quirements for a particular installation.

Table 36 — Nominal and Minimum Cooler

Fluid Flow Rates

UNIT SIZE

 

NOMINAL

MINIMUM

 

FLOW RATE

30GTN,R

 

FLOW RATE*

 

(See Notes)

AND 30GUN,R

 

 

 

 

Gpm

L/s

Gpm

L/s

 

 

040

 

86

5.43

36.8

2.32

045

 

101

6.37

37.7

2.38

050

 

123

7.76

37.7

2.38

060

 

151

9.53

47.5

3.00

070

 

173

10.91

47.5

3.00

080,230B

 

192

12.11

66.7

4.20

090,245B

 

216

13.62

59.5

3.75

100,255B,270B

 

240

15.14

84.1

5.30

110,290B,315B

 

264

16.65

84.1

5.30

130

 

300

18.9

110

6.9

150,230A-255A

 

348

21.9

110

6.9

170,270A,330A/B,

 

384

24.2

120

7.5

360B (50 Hz)

 

 

 

 

 

 

190,290A,360A/B (60 Hz),

 

432

27.2

120

7.5

360A (50 Hz), 390B

 

 

 

 

 

 

210,315A,390A,420A/B

 

480

30.2

148

9.3

LEGEND

 

 

 

 

ARI — Air Conditioning and Refrigeration Institute

Gpm — Gallons per minute (U.S.)

L/s — Liters per second

N— Liters per kW

V — Gallons per ton

*Nominal flow rates required at ARI conditions are 44 F (6.7 C) leaving-fluid temperature, 54 F (12.2 C) entering-fluid temperature, 95 F(35 C) ambient. Fouling factor is .00001 ft2 ⋅ hr ⋅ F/Btu (.000018 m2 ⋅ K/W).

NOTES:

1.Minimum flow based on 1.0 fps (0.30 m/s) velocity in cooler without special cooler baffling.

2.Minimum Loop Volumes:

Gallons = V x ARI Cap. in tons

Liters = N x ARI Cap. in kW

APPLICATION

V

N

Normal Air Conditioning

3

3.25

Process Type Cooling

6 to 10

6.5 to 10.8

Low Ambient Unit Operation

6 to 10

6.5 to 10.8

Operation Sequence — During unit off cycle, crank- case heaters are energized. If ambient temperature is below 36 F (2 C), cooler heaters (if equipped) are energized.

The unit is started by putting the ENABLE/OFF/REMOTE CONTACT switch in ENABLE or REMOTE position. When the unit receives a call for cooling (either from the internal control or CCN network command or remote contact closure), the unit stages up in capacity to maintain the cooler fluid set point. The first compressor starts 11/2 to 3 minutes after the call for cooling.

The lead circuit can be specifically designated or randomly selected by the controls, depending on how the unit is field configured (for 040-070 sizes, Circuit A leads unless an accessory unloader is installed on Circuit B). A field configura- tion is also available to determine if the unit should stage up both circuits equally or load one circuit completely before bringing on the other.

When the lead circuit compressor starts, the unit starts with a pumpout routine. On units with the electronic expansion valve (EXV), compressor starts and continues to run with the EXV at minimum position for 10 seconds to purge the refriger- ant lines and cooler of refrigerant. The EXV then moves to 23% and the compressor superheat control routine takes over, modulating the valve to feed refrigerant into the cooler.

On units with thermostatic expansion valve (TXV) (30GTN,R and 30GUN,R 040,045 units with brine option), head pressure control is based on set point control. When the lead compressor starts, the liquid line solenoid valve (LLSV) is

kept closed for 15 seconds by a time delay relay. The micropro- cessor stages fans to maintain the set point temperature speci- fied by the controller. There is no pumpout sequence during shutdown of TXV controlled chillers.

On all other units (EXV units), the head pressure is con- trolled by fan cycling. The desired head pressure set point is entered, and is controlled by EXV position or saturated con- densing temperature measurement (T3 and T4). For proper op- eration, maintain set point of 113 F (45 C) as shipped from fac- tory. The default head pressure control method is set point con- trol. The head pressure control can also be set to EXV control or a combination of the 2 methods between circuits.

For all units, if temperature reset is being used, the unit con- trols to a higher leaving-fluid temperature as the building load reduces. If demand limit is used, the unit may temporarily be unable to maintain the desired leaving-fluid temperature be- cause of imposed power limitations.

On EXV units, when the occupied period ends, or when the building load drops low enough, the lag compressors shut down. The lead compressors continue to run as the EXV clos- es, and until the conditions of pumpout are satisfied. If a fault condition is signaled requiring immediate shutdown, pumpout is omitted.

Loading sequence for compressors is shown in Tables 5A and 5B.

Refrigerant Circuit

LEAK TESTING — Units are shipped with complete operat- ing charge of refrigerant R-22 for 30GTN,R and R-134a for 30GUN,R (see Physical Data tables supplied in the chiller’s installation instructions) and should be under sufficient pres- sure to conduct a leak test. If there is no pressure in the system, introduce enough nitrogen to search for the leak. Repair the leak using good refrigeration practices. After leaks are repaired, system must be evacuated and dehydrated.

REFRIGERANT CHARGE (Refer to Physical Data tables supplied in the chiller’s installation instructions) — Immedi- ately ahead of filter drier in each circuit is a factory-installed liquid line service valve. Each valve has a 1/4-in. Schrader con- nection for charging liquid refrigerant.

Charging with Unit Off and Evacuated — Close liquid line service valve before charging. Weigh in charge shown on unit nameplate (also in Physical Data tables supplied in the chiller’s installation instructions). Open liquid line service valve; start unit and allow it to run several minutes fully loaded. Check for a clear sight glass. Be sure clear condition is liquid and not vapor.

Charging with Unit Running — If charge is to be added while unit is operating, all condenser fans and compressors must be operating. It may be necessary to block condenser coils at low ambient temperatures to raise condensing pressure to approxi- mately 280 psig (1931 kPa) to turn all condenser fans on. Do not totally block a coil to do this. Partially block all coils in uni- form pattern. Charge each circuit until sight glass shows clear liquid, then weigh in amount over a clear sight glass as listed in Physical data tables supplied in chiller’s installation instructions.

IMPORTANT: When adjusting refrigerant charge, circu- late fluid through cooler continuously to prevent freez- ing and possible damage to the cooler. Do not overcharge, and never charge liquid into low-pressure side of system.

FIELD WIRING

Field wiring is shown in Fig. 36-41.

67

Page 66 Page 68
Image 67
Page 66 Page 68
Contents Contents Safety ConsiderationsGeneral ContentsIntroduction Unit Nominal Section a Section B 30GTN,R Tons Unit 30GTN,R Major System ComponentsUnit Sizes and Modular Combinations 30GTN,R Unit Sizes and Modular Combinations 30GUN,RCarrier Comfort Network CCN Interface Control Module CommunicationThermistor Designations Output Relay Status SwitchesPage 24 V Control Schematic, Unit Sizes 24 V Control Schematic, Unit Sizes 080-110, 230B-315B CCN LEN Data Communication Port Main Base Board 040-110 130-210 Operating DataThermistor T3 and T4 Locations Compressor Thermistor Locations T7 and T8 Columbia D6451 Manhattan M13402 M64430 Quabik 6130 Regular Wiring Plenum Wiring Alpha 1895 AmericanManufacturer Belden 8205Compressor Protection Control System Module Sizes Stepper Motor 12 VDC CEPL130351 Approx Part Load Data Percent Displacement, Standard UnitsDisplacement Compressors 30GUN,R255A 60 Hz 110, 290B390B 50 Hz 330A/B360B 50 Hz 390B 60 HzB1† A1,B1 A1†,A2,B1 A1*,B1†,B2 Unloaded compressor Two unloaders, both unloaded 190, 290A, 360A/B 170, 270AA1*,B1*,B2 150-210 Required Hardware for Additional UnloadersPumpout Head Pressure ControlFAN Arrangement FAN Relay Normal Control PowerScrolling Marquee Display Service Test See Both main powerGEN.O Test ModesVers Run Status Mode and Sub-Mode DirectorySUB-MODE Keypad Range Item Expansion Comment Entry View StrtSUB-MODE Keypad Range Item Expansion Comment Entry Test Service Test Mode and Sub-Mode DirectoryOuts Pressure Mode and Sub-Mode Directory Temperature Mode and Sub-Mode DirectorySet Point Mode and Sub-Mode Directory Crct Inputs Mode and Sub-Mode DirectoryReading and Changing Chilled Fluid Set Point SUB-MODE Keypad Range Item Expansion Comment Entry GEN.IConfiguration Mode and Sub-Mode Directory Outputs Mode and Sub-Mode DirectorySUB-MODE Keypad Range Item Expansion Comment Entry GEN.O EMM OPT1OPT2 CCNRset 240SUB-MODE Keypad Display Item Expansion Comment Entry Rset Example of Temperature Reset Return Fluid ConfigurationExample of Configuring Dual Chiller Control Slave Chiller Example of Configuring Dual Chiller Control Master ChillerSUB-MODE Keypad Entry Display Item Expansion Comment Rset SUB-MODE Keypad Entry Item Expansion Comment Range Time Example of Compressor Lead/Lag ConfigurationTime Clock Mode and Sub-Mode Directory SUB-MODE Keypad Display Item Expansion Comment Entry OPT2Operating Mode and Sub-Mode Directory Setting an Occupied Time ScheduleOperating Modes Mode no Item Expansion DescriptionExample of Reading and Clearing Alarms Alarms Mode and Sub-Mode DirectoryEntry Expansion Configuring Temperature ResetMode Keypad SUB-MODE ConfigurationRED LED Entry Expansion Configuration DLS2 Configuring Demand LimitTo 20 mA Demand Limiting TroubleshootingPage T051 Alarm and Alert CodesLCW By Control Method Cause Code Alert GENERATED?EWT FSMT173 T153T155 T170T206 T203T204 T205Compressor OIL Required ServiceElectronic Components Oil ChargeCooler Thermistor Locations Components for Part Number Plugging PlugsCooler Head Bolt Tightening Sequence Typical Tube Sheet Condenser CoilsDimension FAN Type Condenser Fan Adjustment Hz Low Noise Fan Option UnitsRefrigerant Feed Components Each circuit has Printed Circuit Board ConnectorThermistors Temperature Sensors Drop B 5K Thermistor Temperature F vs Resistance/VoltageDrop a 5K Thermistor Temperature C vs Resistance/Voltage Temp Voltage Resistance Drop 200,510 30GUN,R Units Pressure Switch Settings Psig kPaSwitch Cutout CUT-IN 30GTN,R UnitsSystem Check PRE-START-UPSTART-UP and Operation Temperature Limits for Standard UnitsTemperature Maximum Ambient Temperature 125Refrigerant Circuit Field WiringNominal and Minimum Cooler Fluid Flow Rates CWP ALMHgbps Energy Management Module EMM Wiring Compressor Expansion Board CXB Accessory Wiring Description Status Default Point Unit Configuration SettingsOPTIONS1 Options Configuration Description Status Default Units PointAlarmdef Alarm Definition Table OPTIONS2 Options ConfigurationAppendix a CCN Tables Brodefs Broadcast POC Definition Table Resetcon Temperature Reset and Demand LimitDescription Status Units Point Forceable Aunit General Unit ParametersCircaan Circuit a Analog Parameters Circadio Circuit a Discrete ParametersCircbdio Circuit B Discrete Parameters Circban Circuit B Analog ParametersOptions Unit Parameters Description Status Units Point StrthourCurrmods Description Status Units Point DefaultsLine Description Point CSM/FSM Equipment Table Type 621H, BlockDescription Status Point Cooler Fluid Pressure Drop Curves 30GUN,GUR040-110 Appendix B Fluid Drop Pressure CurvesCooler Fluid Pressure Drop Curves 30GUN,GUR130-210 Appendix B Fluid Drop Pressure CurvesCooler Pressure Drop KEY Appendix B Fluid Drop Pressure Curves Cooler Fluid Pressure Drop Curves 30GUN,GUR230B-315B Cooler Fluid Pressure Drop Curves 30GTN,GTR040-110 Cooler Fluid Pressure Drop Curves 30GTN,GTR130-210 Appendix B Fluid Drop Pressure Curves Module B 30GTN,GTR230,245 Module B 30GTN,GTR255,290,315 Call for Free Catalog Service TrainingRemove and use for job file Preliminary Information START-UP Checklist for Comfortlink Chiller SystemsEquipment Chiller Model no Preliminary Equipment Check Check box if complete UnitStart-Up System Fluid Volume in Loop Type SystemUnit Start-Up Baud Description Status Units Value CtrlCcna CcnbSlct Heating Cooling Setpoint Select CND.P RMT.A All Units

Air Conditioner specifications

Carrier Air Conditioners have long been synonymous with reliability and innovation in climate control. Founded by Willis Carrier, the inventor of modern air conditioning, the brand has continuously set industry standards through state-of-the-art technologies and features designed to enhance indoor comfort.

One of the standout features of Carrier air conditioners is their energy efficiency. Many models are equipped with advanced inverter technology, allowing the compressor to adjust its speed based on the cooling demand. This results in decreased energy consumption, which not only reduces utility bills but also lessens the environmental impact. Recognizing the importance of sustainable practices, Carrier has integrated eco-friendly refrigerants into their systems, further promoting energy-efficient operations.

Carrier also emphasizes user comfort through its variable speed systems. These systems maintain consistent temperatures while minimizing temperature fluctuations, ensuring an even distribution of cool air throughout the home. Additionally, many Carrier models come with advanced air filtration systems, designed to capture allergens, dust, and other particulates, thereby improving indoor air quality.

The smart technology featured in Carrier air conditioners plays a key role in modern convenience. Many units are compatible with smart home systems, allowing users to control settings remotely via smartphones or voice-activated devices. With features like programmable thermostats, users can easily set cooling schedules to match their lifestyle, ensuring comfort while maximizing energy savings.

Durability and noise reduction are also central to the Carrier brand. Many models are designed with sound-dampening features, making them some of the quietest units on the market. This is particularly advantageous for residential use, where noise can disrupt daily activities and sleep.

In terms of design, Carrier air conditioners come in various styles and capacities to suit a wide range of spaces, from compact apartment units to large central systems for sprawling homes. Their extensive warranty and service offerings further reinforce Carrier’s commitment to customer satisfaction.

In conclusion, Carrier air conditioners represent a perfect blend of cutting-edge technology, energy efficiency, and user comfort. Their emphasis on sustainability and smart features positions them as a leading choice for homeowners seeking reliable and innovative climate control solutions. Whether for cooling a small room or an entire house, Carrier remains a trusted name in air conditioning.
Top Page Image Contents