Carrier 19XRV Start-up, Operation And Maintenance Instructions Manual

Also see for AquaEdge 19XRV series: Start-up and service instructions Installation instructions Start-up, operation and maintenance instructions Start-up and service instructions User manual

Carrier 19XRV Start-up, Operation And Maintenance Instructions Manual Manual pdf 42 page image

TileTOWER FAN RELAY HIGH is turned off when thecondenser pump is off, flow is stopped, or the EVAPORATORREFRIG TEMP is less than the EVAP REF OVERRIDE TEMPand ENTERING CONDENSER WATER is less than 70 F(21.1 C), or the difference between EVAPORATOR PRES-SURE and CONDENSER PRESSURE is less than 28 Psid(193 kPa), and ENTERING CONDENSER WATER tempera-ture is less than TOWER FAN HIGH SETPOINT minus 3 F(-16.1 C).Tile TOWER FAN RELAY LOW and TOWER FAN RELAYHIGH parameters are accessed fiom the STARTUP screen.IMPORTANT: A field-supplied water temperature controlsystem for condenser water should be installed. Tile systemshould maintain the leaving condenser water temperatureat a temperatme that is at least 20 ° F (11 ° C) above fileleaving chilled water temperature.The tower fan relay control is not a substitute for a con-denser water temperature control. When used with a watertemperature control system, the tower fan relay control canbe used to help prevent low condenser water temperatures.Auto. Restart After Power Failure -- Tiais optionmay be enabled or disabled and may be viewed or modifiedon the OPTIONS screen, which is accessed from theEQUIPMENT CONFIGURATION table. If the AUTORESTART OPTION is enabled, the chiller will st:ut up automati-cally after a power failure has occurred, generating one of thefollowing faults: single cycle dropout (if enabled), line cunentimbalance, high line voltage, low line voltage, low DC busvoltage, high DC bus voltage, VFD power on reset, and ICVCpower on reset (alerts 143-148, 165 and 166). With this featureenabled, these faults _u'e treated as alerts instead of alarms, sost_utup proceeds as soon as the condition is rectified. The 15 and1-minute start inhibit timers are ignoled during this type of start-up, and the STARTS IN 12 HOURS counter is not incremented.When power is restored after file power failure and if thecompressor had been running, the oil pump will energizefor one minute before energizing the cooler pump. AUTORESTART will then continue like a normal start-up.If power to the ICVC module has been off for mole than3 hours or the timeclock has been set for the fi_t time, start thecompressor with the slowest TEMP PULLDOWN DEG/MINrate possible in order to minimize oil foaming.Tile oil pump is energized occasionally during the time theoil is being brought up to proper tempemtme in order to elimi-nate refiigemnt that has migrated to the oil sump during thepower failure. The pump turns on for 30 seconds at the end ofevery 30-minute period until the chiller is started.Water/Brine Reset -- Chilled water capacity control isbased on achieving and maintaining a CONTROL POINTtemperatme, which is the sum of the LCWSETPOINTorECWSETPOINT (from the SETPOINT screen) and a Water/BrineReset value, if any. CONTROL POINTis limited to a minimumof 35 F (+1.7 C) for water, or 10 F (-12.2 C) for brine. Tilreetypes of chilled water or brine reset are available and can beviewed or modified on the TEMP_CTL screen, which isaccessed from the EQUIPMENT SERVICE table.Tile ICVC default screen indicates when the chilled waterreset is active. TEMPERATURE RESET on the MAINSTATscreen indicates the amount of reset. Tile CONTROL POINTwill be determined by adding the TEMPERATURE RESET tothe SETPOINT.To activate a reset type, access the TEMP_CTL scleen andinput all configuration information for that reset type. Tilen,input the reset type number (1, 2, or 3) in the SELECT/ENABLE RESET TYPE input line.RESET TYPE 1:4 to 20 mA (1 to 5 vdc) TEMPERATURERESET - Reset Type 1 is "automatic" reset utilizing a 4 to20 mA or 1 to 5 vdc analog input signal provided from anyexternal sensol; controllel: or other device which is appropri-ately configured. Reset Type 1 permits up to _+30° F (_+16.7 ° C)of reset to the chilled water set point. Inputs are wired to terlni-nals J5-3 (-) and J5-4 (+) on the CCM (for 4-20 mA input). Inorder to utilize a 1 to 5 vdc input, a 250 ohln resistor must bewired in series with the + input lead (J5-4). For either inputtype, SW2 DIP switches should be set in the ON (up) position.Inputs equivalent to less than 4 mA result in no reset, andinputs exceeding 20 mA are treated as 20 mA.RESET TYPE 2: REMOTE TEMPERATURE RESET --Reset Type 2 is an automatic chilled water temperature resetbased on a remote temperature sensor input signal. Reset type2 permits _+30 ° F (_+ 16 ° C) of automatic reset to the set pointbased on a temperature sensor wired to the CCM module (seewiring diagrams or certified diawings). The temperature sensormust be wired to terminal J4-13 and J4-14. To configure ResetType 2, enter the temperature of the remote sensor at the pointwhere no temperature reset will occur (REMOTE TEMP ->NO RESET). Next, enter the temperatme at which the fullamount of reset will occur (REMOTE TEMP -> FULLRESET). Then, enter the maximum mnount of reset requiled tooperate the chiller (DEGREES RESET). Reset Type 2 can nowbe activated.RESET TYPE 3 -- Reset Type 3 is an automatic chilled watertemperature reset based on cooler temperature difference.Reset Type 3 adds _+30 ° F (_+ 16° C) based on the temperaturediffelence between the ENTERING CHILLED WATER andLEA VIAl(; CHILLED WATER temperature.To configure Reset Type 3, enter the chilled water tempera-ture difference (the difference between entering and leavingchilled water) at which no temperature reset occurs (CHWDELTA T-> NO RESET). Tills chilled water temperature dif-ference is usually the full design load temperature difference.Next, enter the difference in chilled water temperature at whichthe full amount of reset occurs (CttWDELTA T-> FULL RE-SET). Finally. enter the amount of reset (DEGREES RESET).Reset Type 3 can now be activated.Surge Prevention Algorithm -- This is an operatorconfigumble feature that can determine if lift conditions are toohigh for the compressor and then take corrective action. Lift isdefined as the difference between the plessure at the impellereye and at the impeller discharge. Tile maximum lift a particu-lar impeller wheel can perform varies with the gas flowthrough the impeller and the dialneter of the impellecTile lift capability (surge line) of a v_uiable speed compres-sor shifts upward as speed increases. Consequently. the linewhich serves as the surge prevention threshold is made to shiftupward in a similar fashion as speed is increased. If the operat-ing point goes above the surge prevention line as adjusted forthe current operating speed, then surge prevention actions aretaken. Note that the line constructed fiom SURGE/HGBPDELTA TI, SURGE/HBBP DELTA PI, SURGE/HBBP DEL-TA T2, and SURGE/HBBP DELTA P2 values is applied to thefull speed condition only. These surge characteristics are facto-ry set based on the original selection, with the values printed ona label affixed to the bottom interior face of the control panel.Since operating conditions may affect the surge plevention al-gorithm, some field adjustments may be necessary.A chiller equipped with a VFD can adjust inlet guide posi-tion or compressor speed to avoid surge (if not already atCOMPRESSOR 100% SPEED). Thus, the primary responseto entering the surge prevention region or incurring an actualsurge event (see file Surge Protection section) is to increasecomplessor speed. This moves the compressor's surge line and42