Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting

Also see for AQUASNAP 30MPA: User manual Operation and service manual Installation instructions

Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting Manual pdf 27 page image

27ALARM EQUIPMENT PRIORITY — The ComfortVIEWsoftware uses the equipment priority value to determine theorder in which to sort alarms that have the same level. A prior-ity of 0 is the highest and would appear first when sorted. Apriority of 7 would appear last when sorted. For example, iftwo units send out identical alarms, the unit with the higher pri-ority would be listed first. The default is 4. The CCN pointEQP_TYPE is the variable and can be changed when usingComfortVIEW software or Network Service Tool only. Thisvariable cannot be changed with the scrolling marquee or Nav-igator display.COMMUNICATION FAILURE RETRY TIME —This variable specifies the amount of time that will be allowedto elapse between alarm retries. Retries occur when an alarm isnot acknowledged by a network alarm acknowledger, whichmay be either ComfortVIEW software or TeLink. If acknowl-edgement is not received, the alarm will be re-transmitted afterthe number of minutes specified in this decision. The factorydefault for this item is 10 minutes with a range of 1 to 254 min-utes. The CCN Point RETRY_TM is the variable and can bechanged with ComfortVIEW software or Network ServiceTool only. This variable cannot be changed with the scrollingmarquee or Navigator display.RE-ALARM TIME — This variable specifies the amount oftime that will be allowed to elapse between re-alarms. A re-alarm occurs when the conditions that caused the initial alarmcontinue to persist for the number of minutes specified in thisdecision. Re-alarming will continue to occur at the specifiedinterval until the condition causing the alarm is corrected. Todisable this feature, set the variable to 255. The factory defaultis 30 minutes with a range of 1 to 254. The CCN Point RE-ALARM is the variable and can be changed with Comfort-VIEW software or Network Service Tool only. This variablecannot be changed with the scrolling marquee or Navigatordisplay.ALARM SYSTEM NAME — This variable specifies thesystem element name that will appear in the alarms generatedby the unit control. The name can be up to 8 alphanumericcharacters long and should be unique to the unit. The factorydefault is SPLIT. The CCN point ALRM_NAM is the variableand can be changed with ComfortVIEW software or NetworkService Tool only. This variable cannot be changed with thescrolling marquee or Navigator display.Cooler Pump Sequence of Operation — At any-time the unit is in an ON status, as defined by the one of thefollowing conditions, the cooler pump relay will be enabled.1. The Enable-Off-Remote Switch in ENABLE,(CTRL=0).2. Enable-Off-Remote Switch in REMOTE with aStart-Stop remote control closure (CTRL=0).3. An Occupied Time Period from an Occupancy Schedulein combination with items 1 or 2 (CTRL=2).4. A CCN Start-Stop Command to Start in combinationwith items 1 or 2 (CTRL=3).Certain alarm conditions and Operating Modes will turn thecooler pump relay ON. This sequence will describe the normaloperation of the pump control algorithm.When the unit cycles from an ON state to an OFF state, thecooler pump output will remain energized for the Cooler PumpShutdown Delay (ConfigurationOPT1PM.DY). The de-lay is configurable from 0 to 10 minutes. The factory default is1 minute. If the pump output was deenergized during the tran-sition period, the pump output will not be energized.The Cooler Pump Relay will be energized when the ma-chine is ON. The chilled water pump interlock circuit consistsof a chilled water flow switch and a field-installed chilled waterpump interlock. If the chilled water pump interlock circuit doesnot close within five (5) minutes of starting, an A200 - CoolerFlow/Interlock failed to close at Start-Up alarm1 will be gener-ated and chiller will not be allowed to start.If the chilled water pump interlock or chilled water flowswitch opens for at least three (3) seconds after initially beingclosed, an A201 - Cooler Flow 1 Interlock Contacts OpenedDuring Normal Operation alarm will be generated and the ma-chine will stop.Condenser Pump/Condenser Fan Output Con-trol — The main base board (MBB) has the capability tocontrol either a condenser fan output or a condenser pump out-put depending on the unit configuration.If the unit is configured for ConfigurationUNITTYPE = 2 (air cooled), then the output will be off aslong as capacity is equal to 0 and will be energized 5 secondsbefore a compressor is started and remain energized untilcapacity is 0 again.If the unit is configured for ConfigurationUNITTYPE = 3 (water cooled), then the output will be usedfor condenser pump control and additional configuration is re-quired. To enable the condenser pump control, use Configura-tionOPT1D.PM.E. The pump can be configured for nopump control (0), on when occupied (1), and on whencapacity is greater than 0 (2).Configuring and Operating Dual Chiller Con-trol — The dual chiller routine is available for the control oftwo units supplying chilled fluid on a common loop. Thiscontrol algorithm is designed for parallel fluid flow arrangementonly. One chiller must be configured as the master chiller, theother as the slave. An additional leaving fluid temperaturethermistor (Dual Chiller LWT) must be installed as shown inFig. 17 and 18 and connected to the master chiller. Refer to Sen-sors section, page 15, for wiring. The CCN communication busmust be connected between the two chillers. Connections can bemade to the CCN screw terminals on LVT. Refer to CarrierComfort Network® Interface section, page 13, for wiring infor-mation. Configuration examples are shown in Tables 25 and 26.Refer to Table 25 for dual chiller configuration. In thisexample the master chiller will be configured at address 1 andthe slave chiller at address 2. The master and slave chillersmust reside on the same CCN bus (ConfigurationCCNCCNB) but cannot have the same CCN address (Configu-rationCCNCCNA). Both master and slave chillers musthave Lead/Lag Chiller Enable (ConfigurationRSETLLEN) configured to ENBL. Master/Slave Select (Config-urationRSETMSSL) must be configured to MAST forthe master chiller and SLVE for the slave. Also in this example,the master chiller will be configured to use Lead/Lag BalanceSelect (ConfigurationRSETLLBL) and Lead/Lag Bal-ance Delta (ConfigurationRSETLLBD) to even out thechiller run-times weekly. The Lag Start Delay (Configura-tionRSETLLDY) feature will be set to 10 minutes. Thiswill prevent the lag chiller from starting until the lead chillerhas been at 100% capacity for the length of the delay time. Par-allel configuration (ConfigurationRSETPARA) canonly be configured to YES. The variables LLBL, LLBD andLLDY are not used by the slave chiller.Dual chiller start/stop control is determined by configura-tion of Control Method (ConfigurationOPT2CTRL) ofthe Master chiller. The Slave chiller should always be config-ured for CTRL=0 (Switch). If the chillers are to be controlledby Remote Controls, both Master and Slave chillers should beenabled together. Two separate relays or one relay withtwo sets of contacts may control the chillers. The Enable/Off/Remote Control switch should be in the Remote Controlposition on both the Master and Slave chillers. The Enable/Off/Remote Control switch should be in the Enable position forCTRL=2 (Occupancy) or CTRL=3 (CCN Control).