Carrier AQUAFORCE 30XA080-500 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AQUAFORCE 30XA080: Installation instructions Controls, start-up, operation, service and troubleshooting instructions Installation instructions Product data

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Carrier AQUAFORCE 30XA080-500 Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 71 page image

71No additional capacity will be added until the circuit’s su-perheat is greater than 18° F (10° C). The control will look forother circuits to add capacity if additional steps of capacity arerequired. This mode will terminate once the affected circuit’ssuperheat is greater than 18° F (10° C).If this condition is encountered, see Possible Causes forAlarms P.11, P.12 and P.13 on page 98.Sensors — The electronic control uses up to 17 thermistorsto sense temperatures and up to 12 transducers to sensepressure for controlling chiller operation. These sensors areoutlined below.THERMISTORS (Tables 46-47B) — Thermistors that aremonitoring the chiller’s operation include: Cooler EnteringWater, Cooler Leaving Water, Dual Chiller Leaving Water,Compressor Suction Gas Temperature, Compressor DischargeGas Temperature, Economizer Temperature, Compressor MotorTemperature, and Outdoor Air Temperature Thermistors. Thesethermistors are 5 kat 77 F (25 C) and are identical in tempera-ture versus resistance. The Space Temperature Thermistor is10 k at 77 F (25 C) and has a different temperature vs.resistance.Cooler Leaving Water Sensor — On all sizes, this thermistoris installed in a friction fit well in the leaving water nozzle ofthe cooler. See Fig. 42 and 43.Cooler Entering Water Sensor — On all sizes, this thermistoris factory-installed in a friction fit well in the entering waternozzle of the cooler.Suction Gas Temperature — On all sizes, this thermistor isfactory-installed in a friction fit well located on the compressorof each circuit. There is one thermistor for each circuit.Compressor Discharge Gas Temperature — On all sizes, thisthermistor is factory-installed in a friction fit well located in thedischarge end of the compressor for the circuit. There is onethermistor for each circuit.Economizer Temperature — On all sizes except 080 and 082,this thermistor is factory-installed in a friction fit well locatedin the economizer line for the circuit. There is one thermistorfor each circuit.Compressor Motor Temperature — On all sizes, this therm-istor is embedded in the motor windings. There are two therm-istors in each compressor. One spare is provided.Outdoor Air Temperature — This sensor is factory-installedto the back of the control box.Remote Space Temperature — This sensor (part no.33ZCT55SPT) is a field-installed accessory mounted in the in-door space and is used for water temperature reset. The sensorshould be installed as a wall-mounted thermostat would be (inthe conditioned space where it will not be subjected to either acooling or heating source or direct exposure to sunlight, and 4to 5 ft above the floor).Space temperature sensor wires are to be connected toterminals in the unit main control box. See Fig. 44. The spacetemperature sensor includes a terminal block (SEN) and a RJ11female connector. The RJ11 connector is used access intothe Carrier Comfort Network® (CCN) at the sensor.To connect the space temperature sensor (see Fig. 44):1. Using a 20 AWG twisted pair conductor cable rated forthe application, connect one wire of the twisted pair toone SEN terminal and connect the other wire to the otherSEN terminal located under the cover of the spacetemperature sensor.2. Connect the other ends of the wires to terminals 7 and 8on TB6 located in the unit control box.Units on the CCN can be monitored from the space at thesensor through the RJ11 connector, if desired. To wire the RJ11connector into the CCN:1. Cut the CCN wire and strip ends of the red (+), white(ground), and black (–) conductors. (If another wire colorscheme is used, strip ends of appropriate wires.)2. Insert and secure the red (+) wire to terminal 5 of thespace temperature sensor terminal block.3. Insert and secure the white (ground) wire to terminal 4 ofthe space temperature sensor.4. Insert and secure the black (–) wire to terminal 2 of thespace temperature sensor.5. Connect the other end of the communication bus cable tothe remainder of the CCN communication bus.NOTE: The Energy Management Module (EMM) is requiredfor this accessory.TRANSDUCERS — There are four pressure transducers percircuit, and two different types of transducers: low pressure(green connector) and high pressure (black connector).Low Pressure Type: Suction Pressure Transducer (SPT), Econ-omizer Pressure Transducer (EPT).High Pressure Type: Discharge Pressure Transducer (DPT),Oil Pressure Transducer (OPT). See Fig. 45A and 45B fortransducer locations.Table 46 — Thermistor Identification*SGTA and SGTB for 30XA080,082 units are connected to the EXVA board.IMPORTANT: The cable selected for the RJ11connector wiring MUST be identical to the CCNcommunication bus wire used for the entire network.Refer to Table 14 for acceptable wiring.THERMISTOR ID DESCRIPTION RESISTANCE AT 77 F (25 C) CONNECTION POINTEWT Entering Water Thermistor 5k  MBB-J6-CH2LWT Leaving Water Thermistor 5k  MBB-J6-CH1OAT Outdoor Air Thermistor 5k  MBB-J6-CH4SGTA* Circuit A Suction Gas Thermistor 5k  EXVA-J3-THASGTB* Circuit B Suction Gas Thermistor 5k  EXVB-J3-THASGTC Circuit C Suction Gas Thermistor 5k  EXVC-J3-THADGTA Circuit A Discharge Gas Thermistor 5k  CPM-A-J9-CH02DGTB Circuit B Discharge Gas Thermistor 5k  CPM-B-J9-CH02DGTC Circuit C Discharge Gas Thermistor 5k  CPM-C-J9-CH02ECTA Circuit A Economizer Thermistor 5k  EXVA-J3-THBECTB Circuit B Economizer Thermistor 5k  EXVB-J3-THBECTB Circuit C Economizer Thermistor 5k  EXVC-J3-THBDUAL Dual Chiller LWT Thermistor 5k  MBB-J6-CH3CAMT Circuit A Motor Temperature 5k  CPM-A-J9-CH01CBMT Circuit B Motor Temperature 5k  CPM-B-J9-CH01CCMT Circuit C Motor Temperature 5k  CPM-C-J9-CH01SPT Space Temperature Thermistor 10k  EMM-J6-CH2