Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual

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Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual Manual pdf 24 page image

24which should be blinking whenever power is on. Check LENconnections for potential communication errors at the board J3and/or J4 connectors. Communication between modules isaccomplished by a 3-wire sensor bus. These 3 wires run inparallel from module to module. The J4 connector on the MBBprovides both power and communication directly to themarquee display only.YELLOW LED — The MBB has one yellow LED. TheCarrier Comfort Network (CCN) LED will blink during timesof network communication.Table 4 — Thermistor Designations (MBB)Table 5A — Status Inputs (MBB)Table 5B — Status Inputs (CXB)Table 6A — Output Relays (MBB)Table 6B — Output Relays (CXB)Carrier Comfort Network ® (CCN) Interface —The 30RAP chiller units can be connected to the CCN ifdesired. The communication bus wiring is a shielded,3-conductor cable with drain wire and is supplied and installedin the field. See Table 7. The system elements are connected tothe communication bus in a daisy chain arrangement. Thepositive pin of each system element communication connectormust be wired to the positive pins of the system elements oneither side of it. This is also required for the negative andsignal ground pins of each system element. Wiring connectionsfor CCN should be made at LVT. Consult the CCN Contrac-tor’s Manual for further information. Refer to Fig. 14.NOTE: Conductors and drain wire must be 20 AWG (Ameri-can Wire Gage) minimum stranded, tinned copper. Individualconductors must be insulated with PVC, PVC/nylon, vinyl,Teflon*, or polyethylene. An aluminum/polyester 100% foilshield and an outer jacket of PVC, PVC/nylon, chrome vinyl,or Teflon with a minimum operating temperature range of–20 C to 60 C is required. Wire manufactured by Alpha (2413or 5463), American (A22503), Belden (8772), or Columbia(02525) meets the above mentioned requirements.It is important when connecting to a CCN communicationbus that a color coding scheme be used for the entire networkto simplify the installation. It is recommended that red be usedfor the signal positive, black for the signal negative, and whitefor the signal ground. Use a similar scheme for cables contain-ing different colored wires.At each system element, the shields of its communicationbus cables must be tied together. If the communication bus isentirely within one building, the resulting continuous shieldmust be connected to a ground at one point only. If the commu-nication bus cable exits from one building and enters another,the shields must be connected to grounds at the lightningsuppressor in each building where the cable enters or exits thebuilding (one point per building only). To connect the unit tothe network:1. Turn off power to the control box.2. Cut the CCN wire and strip the ends of the red (+), white(ground), and black (–) conductors. (Substitute appropri-ate colors for different colored cables.)3. Connect the red wire to (+) terminal on LVT of the plug,the white wire to COM terminal, and the black wire to the(–) terminal.4. The RJ14 CCN connector on LVT can also be used, but isonly intended for temporary connection (for example, alaptop computer running Service Tool).THERMISTORPINCONNECTIONPOINTTHERMISTOR INPUTLWT J8-13,14 (MBB) Cooler Leaving FluidTemperatureEWT J8-11,12 (MBB) Cooler Entering FluidTemperatureRGTA J8-1,2 (MBB) Circuit A Return GasTemperatureRGTB J8-3,4 (MBB) Circuit B (035-150 only)Return Gas TemperatureOAT J8-7,8 (MBB) Outdoor-Air TemperatureSensorSPT/DLWTJ8-5,6 (MBB)LVT-22,23Accessory Remote SpaceTemperature Sensor orDual LWT SensorDTT J6-1,2 (AUX) Discharge TemperatureThermistorSTATUS SWITCH PIN CONNECTION POINTChilled Water Pump 1 J7-1,2Chilled Water Pump 2 J7-3,4Remote On/Off LVT-13,14Cooler Flow Switch J7-9,10Compressor Fault Signal, A1 J9-11,12Compressor Fault Signal, A2 J9-5,6Compressor Fault Signal, B1 J9-8,9Compressor Fault Signal, B2 J9-2,3STATUS SWITCH PIN CONNECTION POINTCompressor Fault Signal, A3(080,090,115,130,150) J5-11,12Compressor Fault Signal, B3 J5-8,9RELAYNO. DESCRIPTIONK1Energize Compressor A1 (010-050, 070-150)Energize Compressor A1 and Condenser Fan Contac-tor 3 (055,060)K2 Energize Compressor A2 (all but 010, 015 60 Hz)K3 Energize Chilled Water Pump 1 OutputK4 Energize Chilled Water Pump 2 OutputK5Energize Compressor B1 (035-050, 070-150)Energize Compressor B1 and Condenser Fan Contac-tor 3 (055,060)K6 Energize Compressor B2 (035-150)K7 Alarm RelayK8 Cooler/Pump Heater (010-060), Energize CondenserFan Contactor 3 (070-150)K9 Energize Condenser Fan Contactor 1 (018-150)K10 Energize Condenser Fan Contactor 2 (018-150)K11 Minimum Load Valve (010-060)RELAYNO. DESCRIPTIONK1 Energize Compressor Fan Contactor 4K2 Crankcase Heater Relay Output, Circuit AK3 Cooler / Pump HeaterK4 Crankcase Heater Relay Output, Circuit BK5 Energize Compressor B3K6 Energize Compressor A3 (080,090,115,130,150)IMPORTANT: A shorted CCN bus cable will prevent someroutines from running and may prevent the unit from start-ing. If abnormal conditions occur, unplug the connector. Ifconditions return to normal, check the CCN connector andcable. Run new cable if necessary. A short in one section ofthe bus can cause problems with all system elements on thebus.* Registered trademark of Dupont.