Carrier Air Conditioner specifications Stepper Motor 12 VDC

Page 16

Electronic Expansion Valve (EXV) (See Fig. 15) — Standard units are equipped with a bottom seal EXV. This device eliminates the use of the liquid line solenoid pumpdown at unit shutdown. An O-ring has been added to bot- tom of orifice assembly to complete a seal in the valve on shut- down. This is not a mechanical shut-off. When service is required, use the liquid line service valve to pump down the system.

High pressure refrigerant enters bottom of valve where it passes through a group of machined slots in side of orifice as- sembly. As refrigerant passes through the orifice, it drops in pressure. To control flow of refrigerant, the sleeve slides up and down along orifice assembly, modulating the size of orifice. The sleeve is moved by a linear stepper motor that moves in in- crements controlled directly by the processor. As stepper motor rotates, the motion is translated into linear movement of lead screw. There are 1500 discrete steps with this combination. The valve orifice begins to be exposed at 320 steps. Since there is not a tight seal with the orifice and the sleeve, the minimum po- sition for operation is 120 steps.

STEPPER

MOTOR (12 VDC)

ORIFICE ASSEMBLY (INSIDE PISTON SLEEVE)

LEAD SCREW

PISTON SLEEVE

Two thermistors are used to determine suction superheat. One thermistor is located in the cooler and the other is located in the cylinder end of the compressor after refrigerant has passed over the motor. The difference between the 2 ther- mistors is the suction superheat. These machines are set up to provide approximately 5 to 7 F (2.8 to 3.9 C) superheat leaving the cooler. Motor cooling accounts for approximately 22 F (12.2 C) on 30GTN,R units and 16 F (8.9 C) on 30GUN,R units, resulting in a superheat entering compressor cylinders of approximately 29 F (16.1 C) for 30GTN,R units and 23 F (12.8 C) for 30GUN,R units.

Because the valves are controlled by the EXV module, it is possible to track the position of the valve. Valve position can be used to control head pressure and system refrigerant charge.

During initial start-up, the EXV module will drive each valve fully closed. After initialization period, valve position is controlled by the EXV module and the MBB.

The EXV is used to limit the maximum cooler saturated suction temperature to 55 F (12.8 C). This makes it possible for the chiller to start at high cooler fluid temperatures without overloading the compressor.

Energy Management Module (Fig. 16) — This factory-installed option or field-installed accessory is used for the following types of temperature reset, demand limit, and/or ice features:

•4 to 20 mA leaving fluid temperature reset (requires field-supplied 4 to 20 mA generator)

•4 to 20 mA cooling set point reset (requires field- supplied 4 to 20 mA generator)

•Discrete inputs for 2-step demand limit (requires field- supplied dry contacts capable of handling a 5 vdc, 1 to 20 mA load)

•4 to 20 mA demand limit (requires field-supplied 4 to 20 mA generator)

•Discrete input for Ice Done switch (requires field- supplied dry contacts capable of handling a 5 vdc, 1 to 20 mA load)

See Demand Limit and Temperature Reset sections on pages 46 and 43 for further details.

Capacity Control — The control system cycles com- pressors, unloaders, and hot gas bypass solenoids to maintain the user-configured leaving chilled fluid temperature set point. Entering fluid temperature is used by the Main Base Board (MBB) to determine the temperature drop across the cooler and is used in determining the optimum time to add or subtract ca- pacity stages. The chilled fluid temperature set point can be au- tomatically reset by the return temperature reset or space and outdoor-air temperature reset features. It can also be reset from

Fig. 15 — Electronic Expansion Valve (EXV)

an external 4 to 20 mA signal (requires Energy Management Module FIOP/accessory).

With the automatic lead-lag feature in the unit, the control determines which circuit will start first, A or B. At the first call for cooling, the lead compressor crankcase heater will be deen- ergized, a condenser fan will start, and the compressor will start unloaded.

NOTE: The automatic lead-lag feature is only operative when an even number of unloaders is present. The 040-070 units require an accessory unloader to be installed on the B1 com- pressor for the lead-lag feature to be in effect.

If the circuit has been off for 15 minutes, and the unit is a TXV unit, liquid line solenoid will remain closed during start- up of each circuit for 15 seconds while the cooler and suction lines are purged of any liquid refrigerant. For units with EXVs, the lead compressor will be signaled to start. The EXV will re- main at minimum position for 10 seconds before it is allowed to modulate.

After the purge period, the EXV will begin to meter the re- frigerant, or the liquid line solenoid will open allowing the TXV to meter the refrigerant to the cooler. If the off-time is less than 15 minutes, the EXV will be opened as soon as the com- pressor starts.

The EXVs will open gradually to provide a controlled start- up to prevent liquid flood-back to the compressor. During start- up, the oil pressure switch is bypassed for 2 minutes to allow for the transient changes during start-up. As additional stages of compression are required, the processor control will add them. See Tables 5A and 5B.

If a circuit is to be stopped, the control will first start to close the EXV or close the liquid line solenoid valve.

For units with TXVs, the lag compressor(s) will be shut down and the lead compressor will continue to operate for 10 seconds to purge the cooler of any refrigerant.

For units with EXVs, the lag compressor(s) will be shut down and the lead compressor will continue to run. After the lag compressor(s) has shut down, the EXV is signaled to close. The lead compressor will remain on for 10 seconds after the EXV is closed.

During both algorithms (TXV and EXV), all diagnostic conditions will be honored. If a safety trip or alarm condition is detected before pumpdown is complete, the circuit will be shut down.

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Contents Safety Considerations ContentsGeneral ContentsIntroduction Major System Components Unit Sizes and Modular Combinations 30GTN,RUnit Sizes and Modular Combinations 30GUN,R Unit Nominal Section a Section B 30GTN,R Tons Unit 30GTN,RCarrier Comfort Network CCN Interface Control Module CommunicationThermistor Designations Status Switches Output RelayPage 24 V Control Schematic, Unit Sizes 24 V Control Schematic, Unit Sizes 080-110, 230B-315B CCN LEN Data Communication Port Main Base Board Operating Data 040-110 130-210Thermistor T3 and T4 Locations Compressor Thermistor Locations T7 and T8 Regular Wiring Plenum Wiring Alpha 1895 American ManufacturerBelden 8205 Columbia D6451 Manhattan M13402 M64430 Quabik 6130Compressor Protection Control System Module Sizes Stepper Motor 12 VDC CEPL130351 Part Load Data Percent Displacement, Standard Units Displacement Compressors30GUN,R Approx110, 290B 255A 60 Hz330A/B 360B 50 Hz390B 60 Hz 390B 50 HzB1† A1,B1 A1†,A2,B1 A1*,B1†,B2 Unloaded compressor Two unloaders, both unloaded 170, 270A 190, 290A, 360A/BA1*,B1*,B2 Required Hardware for Additional Unloaders 150-210Head Pressure Control PumpoutPower FAN Arrangement FAN Relay Normal ControlService Test See Both main power Scrolling Marquee DisplayModes GEN.O TestRun Status Mode and Sub-Mode Directory SUB-MODE Keypad Range Item Expansion Comment Entry ViewStrt VersSUB-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 Inputs Mode and Sub-Mode Directory Reading and Changing Chilled Fluid Set PointSUB-MODE Keypad Range Item Expansion Comment Entry GEN.I CrctConfiguration Mode and Sub-Mode Directory Outputs Mode and Sub-Mode DirectorySUB-MODE Keypad Range Item Expansion Comment Entry GEN.O OPT1 OPT2CCN EMM240 RsetExample of Temperature Reset Return Fluid Configuration SUB-MODE Keypad Display Item Expansion Comment Entry RsetExample of Configuring Dual Chiller Control Slave Chiller Example of Configuring Dual Chiller Control Master ChillerSUB-MODE Keypad Entry Display Item Expansion Comment Rset Example of Compressor Lead/Lag Configuration Time Clock Mode and Sub-Mode DirectorySUB-MODE Keypad Display Item Expansion Comment Entry OPT2 SUB-MODE Keypad Entry Item Expansion Comment Range TimeSetting an Occupied Time Schedule Operating Mode and Sub-Mode DirectoryMode no Item Expansion Description Operating ModesAlarms Mode and Sub-Mode Directory Example of Reading and Clearing AlarmsConfiguring Temperature Reset Mode Keypad SUB-MODEConfiguration Entry ExpansionRED LED Entry Expansion Configuration Configuring Demand Limit DLS2Troubleshooting To 20 mA Demand LimitingPage Alarm and Alert Codes T051By Control Method Cause Code Alert GENERATED? EWTFSM LCWT153 T155T170 T173T203 T204T205 T206Service Electronic ComponentsOil Charge Compressor OIL RequiredCooler Thermistor Locations Plugs Components for Part Number PluggingCondenser Coils Cooler Head Bolt Tightening Sequence Typical Tube SheetCondenser Fan Adjustment Hz Low Noise Fan Option Units Dimension FAN TypePrinted Circuit Board Connector Refrigerant Feed Components Each circuit hasThermistors 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 Pressure Switch Settings Psig kPa Switch Cutout CUT-IN30GTN,R Units 30GUN,R UnitsPRE-START-UP System CheckTemperature Limits for Standard Units TemperatureMaximum Ambient Temperature 125 START-UP and OperationRefrigerant Circuit Field WiringNominal and Minimum Cooler Fluid Flow Rates CWP ALMHgbps Energy Management Module EMM Wiring Compressor Expansion Board CXB Accessory Wiring Unit Configuration Settings OPTIONS1 Options ConfigurationDescription Status Default Units Point Description Status Default PointAlarmdef Alarm Definition Table OPTIONS2 Options ConfigurationAppendix a CCN Tables Resetcon Temperature Reset and Demand Limit Brodefs Broadcast POC Definition TableAunit General Unit Parameters Circaan Circuit a Analog ParametersCircadio Circuit a Discrete Parameters Description Status Units Point ForceableCircban Circuit B Analog Parameters Circbdio Circuit B Discrete ParametersOptions Unit Parameters Strthour Description Status Units PointDescription Status Units Point Defaults CurrmodsLine Description Point CSM/FSM Equipment Table Type 621H, BlockDescription Status Point Appendix B Fluid Drop Pressure Curves Cooler Fluid Pressure Drop Curves 30GUN,GUR040-110Cooler 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 Service Training Call for Free CatalogRemove and use for job file Preliminary Information START-UP Checklist for Comfortlink Chiller SystemsEquipment Chiller Model no Preliminary Equipment Check Check box if complete System Fluid Volume in Loop Type System UnitStart-UpUnit Start-Up Description Status Units Value Ctrl CcnaCcnb BaudSlct 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.
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