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 34 page image

344 TO 20 mA INPUT — Unit operation is based on an external4 to 20 mA signal input to the Energy Management Module(EMM). Refer to page 27.CONFIGURATION SET POINT LIMITS — Table 12 listsconfiguration set point limits.Table 12 — Configuration Set Point LimitsCooling Set Point (4 to 20 mA) — A field suppliedand generated, externally powered 4 to 20 mA signal input tothe Energy Management Module (EMM) can be used to pro-vide the leaving fluid temperature set point. Connect the signalto LVT10,8 (+,–). Figure 22 shows how the 4 to 20 mA signalis linearly calculated on an overall 10 F to 80 F range for fluidtypes (ConfigurationOPT1FLUD) 1 or 2. The set pointwill be limited by the fluid (FLUD) type. Be sure that thechilled water loop is protected at the lowest temperature.Low Sound Mode Operation — All models are fac-tory configured with the Low Sound Mode disabled. In theConfiguration mode under sub-mode OPT2, items for LowSound Mode Select (ConfigurationOPT2LS.MD), LowSound Start Time (ConfigurationOPT2LS.ST), LowSound End Time (ConfigurationOPT2LS.ND) and LowSound Capacity Limit (ConfigurationOPT2LS.LT) arefactory configured so that the chiller always runs as quietly aspossible. This results in operation at increased saturated con-densing temperature. As a result, some models may not be ableto achieve rated efficiency. For chiller operation at rated effi-ciency, disable the low sound mode or adjust the low soundmode start and stop times accordingly or set both times to00:00 for rated efficiency operation 24 hours per day. In addi-tion, the low sound capacity limit can be used to reduce overallchiller capacity, if required, by limiting the maximum to a user-configured percentage.Heating Operation — The chiller can be used for pumpoutputs or optional factory-installed hydronic system operationcan be utilized for heating applications. The heating mode isactivated when the control sees a field-supplied closed switchinput to terminal block LVT-19,20. The control locks out cool-ing when the heat relay input is seen. A field-supplied boiler re-lay connection is made using heat relay and alarm relay con-tacts. Factory-installed ‘BOILER’ connections exist in the con-trol panel near LVT for these applications. Alarms and alertsA189 through A202 are active during heating operation.Service Test — Both main power and control circuitpower must be on.The Service Test function should be used to verify properoperation of condenser fan(s), compressors, minimum loadvalve solenoid (if installed), cooler pump(s), EXVs, and re-mote alarm relay. To use the Service Test mode, the Enable/Off/Remote Contact switch must be in the OFF position. Usethe Service Test Mode and Sub-Mode Directory table in Ap-pendix A to enter the mode and display TEST. Presstwice so that OFF flashes. Enter the password if required. Useeither arrow key to change the TEST value to the ON positionand press . Press and the button to en-ter the OUTS or COMP sub-mode.Test the condenser fans, cooler pump(s) and alarm relay bychanging the item values from OFF to ON. These discreteoutputs are then turned off if there is no keypad activity for10 minutes. Use the arrow keys to select the desired percentagewhen testing expansion valves and Motormaster® V controller.When testing compressors, lead compressor must be startedfirst. All compressor outputs can be turned on, but the controlwill limit the rate by staging one compressor per minute. Com-pressor unloaders and hot gas bypass relays/solenoids (if in-stalled) can be tested with the compressors on or off. The relaysunder the COMP mode will stay on for 10 minutes if there isno keypad activity. Compressors will stay on until they areturned off by the operator. The Service Test mode will remainenabled for as long as there is one or more compressors run-ning. All safeties are monitored during this test and will turn acompressor, circuit or the machine off if required. Any othermode or sub-mode can be accessed, viewed, or changed duringthe TEST mode. The MODE item (Run StatusVIEW) willdisplay “0” as long as the Service mode is enabled. The TESTsub-mode value must be changed back to OFF before the chill-er can be switched to Enable or Remote contact for normaloperation.The pump(s) in the hydronic package come factorypre-wired into the main unit power supply/starter. In order tocheck proper pump rotation, use the Service Test function totest the condenser fans and observe them for proper rotation. Iffans turn correctly, the pumps will rotate correctly. Clockwiserotation of the pump motor cooling fans can also be used to de-termine that pumps are rotating correctly.Use Service Test function to test operation of pumps. Verifythat the flow switch input is made when the pump is running.For dual pump hydronic systems, the control only uses onepump at a time. Consult the Installation Instructions suppliedwith this chiller and use the circuit setter balancing valveinstalled in hydronic package to adjust fluid flow rate.Optional Factory-Installed Hydronic Pack-age — If the chiller has factory-installed chilled fluid pumps,specific steps should be followed for proper operation.Cooler Pump Control — The AquaSnap® 30RAP ma-chines equipped with a factory-installed pump package areconfigured with the Cooler Pump Control (Configura-tionOPT1CPC) = ON.Machines not equipped with a pump package are config-ured with the cooler pump control OFF. It is recommended thatthe machine control the chilled water pump. If not, a 5-minutetime delay is required after command to shut machine down issent before chilled water pump is turned off. This is required tomaintain water flow during shutdown period of the machine.With or without this option enabled, the cooler pump relaywill be energized when the machine enters an ON status (i.e.,On Local, On CCN, On Time). An A207 — Cooler FreezeSET POINT LIMIT COOLER FLUID TYPE (FLUD)1 = WATER 2 = BRINEMinimum 40 F (4.4 C) 14 F (–10.0 C)Maximum 60 F (15.5 C)100 (38)80 (27)60 (15)40 (4.4)20 (-7)0 (-17)90 (32)70 (21)50 (10)30 (-1)10 (-12) (FLUD = 2) MINIMUMSETPOINT 14F (-10C)0 2 4 6 8 10 12 14 16 18 204 to 20 mA Signal to EMMSETPOINT F (C)(FLUD = 1) MINIMUMSETPOINT 38F (3.3C)MAXIMUMSETPOINT70F (21.1C)Fig. 22 — Cooling Set Point (4 to 20 mA)EMM — Energy Management Module a30-5524CAUTIONOperation of pump in wrong direction, even for a fewseconds, can cause irreversible damage to pump impellerand housing. Always verify correct wiring/pump rotationbefore operation.ENTERENTER ESCAPE