Carrier AQUASNAP 30RAP010-150 Controls, Start-up, Operation, Service, And Troubleshooting

Also see for AQUASNAP 30RAP010-150: Start up & operation manual Installation instructions Installation instructions Controls, start-up, operation, service, and troubleshooting

Carrier AQUASNAP 30RAP010-150 Controls, Start-up, Operation, Service, And Troubleshooting Manual pdf 24 page image

24Energy Management Module (EMM) — The EMMmodule is available as a factory-installed option or as a field-installed accessory. The EMM module receives 4 to 20 mAinputs for the leaving fluid temperature reset, cooling set pointand demand limit functions. The EMM module also receivesthe switch inputs for the field-installed 2-stage demand limitand ice done functions. The EMM module communicates thestatus of all inputs with the MBB, and the MBB adjusts thecontrol point, capacity limit, and other functions according tothe inputs received.Current Sensor Board (CSB) — The CSB is used tomonitor the status of the compressors by measuring current andproviding an analog input to the main base board (MBB) orcompressor expansion module (CXB).AUX Board (AUX) — The AUX board is used with thedigital scroll option and the low ambient head pressure option.It provides additional inputs and outputs for digital scroll con-trol along with analog outputs to control head pressure controlfan speeds. See Tables 7A and 7B.Expansion Valve Board (EXV) — The EXV boardcommunicates with the MBB and directly controls the expan-sion valves to maintain the correct compressor superheat.Compressor Expansion Board (CXB) — TheCXB board communicates with the MBB and directly controlsadditional compressors, for contactors, cooler/pump heatersand compressor crankcase heater relays for sizes 070-150.Enable/Off/Remote Contact Switch — The Enable/Off/Remote Contact switch (SW1) is a 3-position switch usedto control the chiller. When switched to the Enable position thechiller is under its own control. Move the switch to the Offposition to shut the chiller down. Move the switch to theRemote Contact position and a field-installed dry contact canbe used to start the chiller. The contacts must be capable ofhandling a 24 vac, 50-mA load. In the Enable and RemoteContact (dry contacts closed) positions, the chiller is allowed tooperate and respond to the scheduling configuration, CCNconfiguration and set point data. See Fig. 15.Emergency On/Off Switch — The Emergency On/Offswitch (SW2) should only be used when it is required to shutthe chiller off immediately. Power to the MBB, EMM, andmarquee display is interrupted when this switch is off and alloutputs from these modules will be turned off.Board Addresses — The main base board (MBB) has a3-position instance jumper that must be set to ‘1.’ The elec-tronic expansion valve board (EXV), compressor expansionboard (CXB), and energy management board (EMM) have 4-position DIP switches. All switches are set to ‘On’ for theseboards. The auxiliary board (AUX) has an 8-position DIPswitch. Switches 2, 5, and 7 are set to ‘On.’Control Module CommunicationRED LED — Proper operation of the control boards can bevisually checked by looking at the red status LEDs(light-emitting diodes). When operating correctly, the red statusLEDs should be blinking in unison at a rate of once every2 seconds. If the red LEDs are not blinking in unison, verifythat correct power is being supplied to all modules. Be sure thatthe main base board (MBB) is supplied with the current soft-ware. If necessary, reload current software. If the problem stillpersists, replace the MBB. A red LED that is lit continuously orblinking at a rate of once per second or faster indicates that theboard should be replaced.GREEN LED — The MBB has one green LED. The LocalEquipment Network (LEN) LED should always be blinkingwhenever power is on. All other boards have a LEN LEDwhich should be blinking whenever power is on. Check LENconnections for potential communication errors at the board J3Fig. 14 — CCN Wiring Diagrama30-5381Fig. 15 — Enable/Off/Remote Contact Switch,and Emergency On/Off Switch Locationsa30-4967