Carrier AQUASNAP AIR COOLED CHILLERS WITH COMFORTLINK CONTROLS 30RAP010-060 Operation And Service Manual

Also see for Aquasnap 30RAP010: Installation instructions Start up & operation manual Product data Product data

Carrier AQUASNAP AIR COOLED CHILLERS WITH COMFORTLINK CONTROLS 30RAP010-060 Operation And Service Manual Manual pdf 35 page image

35Cooler 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 contact 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).As stated before, there are certain alarm conditions andOperating Modes that will turn the cooler pump relay ON. Thissequence will describe the normal operation of the pumpcontrol algorithm.When the unit cycles from an “On” state to an “Off” state,the cooler pump output will remain energized for the CoolerPump Shutdown Delay (ConfigurationOPT1PM.DY).This is configurable from 0 to 10 minutes. The factory defaultis 1 minute.NO INTEGRAL PUMP — SINGLE EXTERNAL PUMPCONTROL — With a single external pump, the followingoptions must be configured:• Cooler Pump Control (ConfigurationOPT1CPC) =OFF.• Cooler Pump 1 Enable (ConfigurationOPT1PM1E) = NO.• Cooler Pump 2 Enable (ConfigurationOPT1PM2E) = NO.The maximum load allowed for the Chilled Water PumpStarter is 5 VA sealed, 10 VA inrush at 24 volts. The starter coilis powered from the chiller control system. The starter shouldbe wired between LVT-25 and LVT-21. If equipped, the field-installed chilled water pump starter auxiliary contacts shouldbe connected in series with the chilled water flow switch.The Cooler Pump Relay will be energized when themachine is “On.” The chilled water pump interlock circuitconsists of a chilled water flow switch and a field-installedchilled water pump interlock. If the chilled water pump inter-lock circuit does not close within five (5) minutes of starting,an A200 — Cooler Flow/Interlock Failed to Close at Start-UpAlarm will be generated 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/Interlock Contacts OpenedDuring Normal Operation Alarm will be generated and the ma-chine will stop.NO INTEGRAL PUMP — DUAL EXTERNAL PUMPCONTROL — With two external pumps, the followingoptions must be configured:• Cooler Pump Control (ConfigurationOPT1CPC) =ON.• Cooler Pump 1 Enable (ConfigurationOPT1PM1E) = YES.• Cooler Pump 2 Enable (ConfigurationOPT1PM2E) = YES.The maximum load allowed for the Chilled Water PumpStarters is 5 VA sealed, 10 VA inrush at 24 volts. The startercoil is powered from the chiller control system. The starter forChilled Water Pump 1 should be wired between LVT-25 andLVT-21. The starter for Chilled Water Pump 2 should be wiredbetween LVT-24 and LVT-21. A field-installed chilled waterpump interlock for each pump must be connected to eachpump’s interlock points on the main base board. The chilledwater pump 1 interlock, CWP1, must be connected to MBB-J7-1 and –2. The chilled water pump 2 interlock, CWP2, mustbe connected to MBB-J7-3 and –4. The chilled water pumpinterlock contacts should be rated for dry circuit applicationcapable of handling 5 vdc at 2 mA.SINGLE INTEGRAL PUMP CONTROL — With a singlepump, the following options must be configured:• Cooler Pump Control (ConfigurationOPT1CPC) =ON.• Cooler Pump 1 Enable (ConfigurationOPT1PM1E) = YES.• Cooler Pump 2 Enable (ConfigurationOPT1PM2E) = NO.With a single integral pump, the Cooler Pump Starter willbe energized when the machine is occupied. As part of thefactory-installed package, an auxiliary set of contacts is wiredto the MBB to serve as Chilled Water Pump Interlock. Whenthe mechanical cooling is called for, the pump interlock andflow switch is checked. If the circuits are closed, the machinestarts its capacity routine. If the auxiliary contact interlock doesnot close within 25 seconds of the ON command, a T190 —Cooler Pump 1 Aux Contacts Failed to Close at Start-Up Alertwill be generated and the pump shut down. The unit will notbe allowed to start. If the chilled water flow switch does notclose within one (1) minute, two alarms will be generated. AT192 — Cooler Pump 1 Failed to Provide Flow at Start-UpAlert and an A200 — Cooler Flow/Interlock Failed to Close atStart-Up Alarm will be generated and chiller will not be al-lowed to start.If the chilled water flow switch opens for at least 3 secondsafter initially being closed, a T196 — Flow Lost While Pump 1Running Alert and an A201 — Cooler Flow/Interlock ContactsOpened During Normal Operation Alarm will be generatedand the machine will stop.If the control detects the chilled water pump interlock openfor 25 seconds after initially being closed, a T194 — CoolerPump 1 Contacts Opened During Normal Operation Alert isgenerated and the unit is shut down.If the control detects the chilled water flow switch circuitclosed for at least 5 minutes with the pump output OFF, anA202 — Cooler Pump Interlock Closed When Pump is OffAlarm will be generated and the unit will not be allowed tostart.If the control detects that the chilled water pump auxiliarycontacts are closed for at least 25 seconds while the pump isOFF, a T198 — Cooler Pump 1 Aux Contacts Closed WhilePump Off Alert is generated. The chiller will not be allowed tostart.If the control starts a pump and the wrong interlock circuitcloses for at least 20 seconds, an A189 — Cooler Pump andAux Contact Input Miswire Alarm will be generated. The unitwill be prevented from starting.As part of a pump maintenance routine, the pump can bestarted to maintain lubrication of the pump seal. To utilize thisfunction, Cooler Pmp Periodic Start (ConfigurationOPT1PM.P.S) must be set to YES. This option is set to NO as thefactory default. With this feature enabled, if the pump is not op-erating, it will be started and operated for 2 seconds starting at14:00 hours. If the pump is operating, this routine is skipped. Ifthe pump has failed and an Alarm/Alert condition is active, thepump will not start that day.DUAL INTEGRAL PUMP CONTROL — With a dual inte-gral pump package, the following options must be configured:• Cooler Pump Control (ConfigurationOPT1CPC) =ON.• Cooler Pump 1 Enable (ConfigurationOPT1PM1E) = YES.• Cooler Pump 2 Enable (ConfigurationOPT1PM2E) = YES.Pump Start Selection is a field-configurable choice. CoolerPump Select (ConfigurationOPT1PM.SL) is factorydefaulted to 0 (Automatic). This value can be changed to 1a30-4979