Carrier AQUASNAP MPW015-045 Operation And Service Manual

Also see for AQUASNAP 30MPA: User manual Installation instructions Controls, start-up, operation, service, and troubleshooting

24may be entered for systems with brine solutions, but this valueshould be set according to the freeze protection level of thebrine mixture. Failure to properly set this brine freeze point val-ue may permanently damage the brazed plate heat exchanger.The control will initiate Mode 7 (Circuit A) to indicate a cir-cuit’s capacity is limited and that eventually the circuit mayshut down.Operation of Machine Based on ControlMethod and Cooling Set Point Selection Set-tings — Machine On/Off control is determined by theconfiguration of the Control Method (ConfigurationOPT2CTRL) and Cooling Set Point Select(ConfigurationSLCTCLSP) variables. All units are fac-tory configured with Cooling Set Point Select set to 0 (singleset point). With the control method set to 0, simply switchingthe Enable/Off/Remote Contact switch to the Enable orRemote Contact position (external contacts closed) will put thechiller in an occupied state. The control mode (RunStatusVIEWSTAT) will be 1 (OFF LOCAL) when theswitch is Off and will be 5 (ON LOCAL) when in the Enableposition or Remote Contact position with external contactsclosed.Two other control methods are available for Machine On/Off control:OCCUPANCY SCHEDULE (ConfigurationOPT2CTRL = 1) — The main base board will use the operatingschedules as defined under the Time Clock mode in the scroll-ing marquee display. These schedules are identical. The sched-ule number must be set to 1 for local schedule.The schedule number can be set anywhere from 65 to 99for operation under a CCN global schedule. The Enable/Off/Remote Contact must be in the Enable or Remote Contact posi-tion. The control mode (Run StatusVIEWSTAT) will be1 when the switch is Off. The control mode will be 3 when theEnable/Off/Remote Contact switch input is On and the time ofday is during an unoccupied period. Similarly, the controlmode will be 7 when the time of day is during an occupiedperiod.CCN SCHEDULE (ConfigurationOPT2CTRL =2) — An external CCN device such as Chillervisor SystemManager controls the On/Off state of the machine. This CCNdevice forces the variable ‘CHIL_S_S’ between Start/Stop tocontrol the chiller. The control mode (Run StatusVIEWSTAT) will be 1 when the switch is Off. The con-trol mode will be 2 when the Enable/Off/Remote Contactswitch input is On and the CHIL_S_S variable is ‘Stop.’Similarly, the control mode will be 6 when the CHIL_S_S vari-able is ‘Start.’Table 20 illustrates how the control method and cooling setpoint select variables direct the operation of the chiller and theset point to which it controls. The illustration also shows theON/OFF state of the machine for the given combinations.Cooling Set Point SelectSINGLE — Unit operation is based on Cooling Set Point 1(Set PointsCOOLCSP.1).DUAL SWITCH — Unit operation is based on Cooling SetPoint 1 (Set PointsCOOLCSP.1) when the Dual SetPoint switch contacts are open and Cooling Set Point 2 (SetPointsCOOLCSP.2) when they are closed.DUAL CCN OCCUPIED — Unit operation is based onCooling Set Point 1 (Set PointsCOOLCSP.1) during theOccupied mode and Cooling Set Point 2 (SetPointsCOOLCSP.2) during the Unoccupied mode asconfigured under the local occupancy schedule accessible onlyfrom CCN. Schedule Number in Table SCHEDOVR (See Ap-pendix B) must be configured to 1. If the Schedule Number isset to 0, the unit will operate in a continuous 24-hr Occupiedmode. Control method must be configured to 0 (switch). SeeTable 20.4 TO 20 mA INPUT — Unit operation is based on an external4 to 20 mA signal input to the Energy Management Module(EMM).Cooler Pump Control — The AquaSnap® 30MP ma-chines are configured with the Cooler Pump Control (Configu-rationOPT1CPC) = ON.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 24 and TB3-1. If equipped, the field-in-stalled chilled water pump starter auxiliary contacts should beconnected in series with the chilled water flow switch betweenLVT 16 and LVT 17.Ice Mode — When Ice Mode is enabled Cooling SetpointSelect must be set to Dual Switch, Dual 7 day or Dual CCNOccupied and the Energy Management Module (EMM) mustbe installed. Unit operation is based on Cooling Setpoint 1(CSP.1) during the Occupied mode, Ice Setpoint (CSP.3) dur-ing the Unoccupied mode with the Ice Done contacts open andCooling Setpoint 2 (CSP.2) during the Unoccupied mode withthe Ice Done contacts closed. These 3 set points can be utilizedto develop your specific control strategy.Service Test (See Table 4) — Both main power andcontrol circuit power must be on.The Service Test function should be used to verify properoperation of condenser output, compressors, minimum loadvalve solenoid (if installed), cooler pump, and remote alarm re-lay. To use the Service Test mode, the Enable/Off/Remote Con-tact switch must be in the OFF position. Use the display keysand Table 4 to enter the mode and display TEST. Presstwice so that OFF flashes. Enter the password if re-quired. Use either arrow key to change the TEST value to theON position and press . Press and thebutton to enter the OUTS or COMP sub-mode.Table 20 — Control Methods and Cooling Set Points*Dual set point switch input used. CSP1 used when switch input is open. CSP2 used when switch input is closed.†Cooling set point determined from 4 to 20 mA input to energy management module (EMM) to terminals TB6-3,5.ENTERENTER ESCAPECONTROLTYPE(CTRL)OCCUPANCYSTATECOOLING SET POINT SELECT (CLSP)0(single)1(dual, switch)2(dual, occ)3(4 to 20 mA)0 (switch) Occupied ON,CSP1 ON* ON,CSP1 ON†Unoccupied ON,CSP1 ON* ON,CSP2 ON2 (Occupancy) Occupied ON,CSP1 ON* Illegal ON†Unoccupied OFF OFF Illegal OFF3 (CCN) Occupied ON,CSP1 ON* ON,CSP1 ON†Unoccupied ON,CSP1 ON* ON,CSP2 ON†