Carrier AquaForce B Series Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AquaForce 30XV140: Controls, start-up, operation, service and troubleshooting instructions

Contents

Carrier AquaForce B Series Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 31 page image

31temperature set point range of 38 to 60°F (3.3 to 15.5°C). Withwater as the selection, the freeze point is fixed at 34°F (1.1°C).Brine or GlycolConfigure the unit Evaporator Fluid Type to Medium Brine orLow Brine for units with brine or glycol added to the chilled waterloop. The Low Brine option will allow for a set point temperaturerange of 14 to 36°F (–10 to 2.2°C).See chart on page 30 for temperature limits for brine options.Before making this selection, confirm suitable antifreeze hasbeen added and is of sufficient concentration to protect theloop. In addition, the Brine Freeze Setpoint (Main MenuConfiguration Menu Service Parameters Brine FreezeSetpoint) must be set for proper freeze protection operation.Set the Brine Freeze Setpoint to the freeze protection providedby the antifreeze concentration. This value will be the freezepoint of the fluid.Evaporator Pump ControlEvaporator pump control is required on all units unless thechilled water pump runs continuously or the chilled water sys-tem contains a suitable antifreeze solution. For units suppliedwith the pump option, this is set up from the factory. The 30XVunits with Greenspeed® Intelligence can be configured for sin-gle or dual external evaporator pump control with the standardcontrols. In addition to the pumps, all wiring including connec-tions to the pump contactor and a feedback circuit from thecontactor must be field supplied. Table 25 summarizes evapo-rator pump configuration parameters. Fig. 30 shows the wiring.PUMP SELECTIONThe Evaporator Pump Sequence mode can be reached by fol-lowing Main Menu Configuration Menu Pump Config-uration. The available settings are:• 0 = No Pump: The evaporator pump will not be controlledby the chiller. This is the default setting.• 1 = One Pump Only, Factory Supplied Pumps: Use for asingle remote pump or for factory supplied pumps. (“1” isalso used for factory supplied pumps.)• 2 = Two Pump Auto: When two pumps are selected in automode, only one pump will be allowed to run at a time andthe control will determine the On/Off state of each pump.The control will start the pumps and automatically alter-nate the operation of the pumps to even the wear on thepumps, based on the hours configured under Pump AutoRotation Delay (Main Menu Configuration MenuPump Configuration Pump Auto Rotation Delay). Ifthe difference between the operating hours of the twopumps exceeds the Pump Auto Rotation Delay, the leadpump will change. If a flow failure is detected, the otherpump will attempt to start.• 3 = Pump #1 Manual: Pump #1 will be the active pump.• 4 = Pump #2 Manual: Pump #2 will be the active pump.Table 25 — Evaporator Pump ConfigurationParametersFig. 30 — Wiring for Evaporator Pump ControlFactory supplied pumps should have this configuration set to 1.There is only one “on” signal to the pumps. The pumps run si-multaneously. Speed is controlled in the pump software andcommunication between the pumps sets the appropriate speedfor each pump.When the Evaporator Pumps Sequence is con-figured, the evaporator pump output will be energized whenthe chiller enters an On state. Proof of flow from the chilledwater flow switch (CWFS) is required for the unit to start me-chanical cooling. The evaporator pump output is also energizedwhen certain alarms are generated. The evaporator pump out-put should be used as an override to the external pump controlif evaporator pump control is not utilized. The evaporatorpump output is energized if a 10001 Evaporator Freeze Protec-tion alarm is generated, which provides additional freeze pro-tection if the system is not protected with a suitable antifreezesolution.If the Master/Slave function is not active for the chiller or if theMaster/Slave function is active and the unit is the lead, thepump will be turned on when the unit is in On, Stopping, orDelay state. In addition, when the unit is turned off the pumpwill continue operating for 20 seconds after the last compressoris turned off. The pump will be turned on when requested bythe evaporator heater function (see the Evaporator Freeze Pro-tection section on page 71).FACTORY-SUPPLIED PUMPSPumps supplied by the factory are piped in a parallel arrangement.These pumps are driven with ECM variable speed motors. All ofthe pumps may run simultaneously. Sensorless control based inthe pump motor is used to determine the speed of each pump. Thechiller control treats the pump assembly as a single pump with re-gard to starting and stopping the pump system. For setup and oper-ating details, see “Factory-Supplied Pumps” on page 336.PERIODIC PUMP QUICK STARTThe control system has the ability to start the pumps periodi-cally to maintain bearing lubrication and seal integrity. Thisfunction will be used when the unit is stopped for a long timeDISPLAY NAME PATH VALUEEvaporatorPumpsSequenceMain MenuConfiguration MenuPump Configuration0 = No Pump (Default)1 = One Pump Only ("1"is also used for factorysupplied pumps.)2 = Two Pumps Auto3 = Pump no. 1 Manual4 = Pump no. 2 ManualPump AutoRotation DelayDefault: 48 hrs.(Range 24 to 3000 hrs.)Pump StickingProtection Default: NoFlow CheckedIf Pump Off Default: Yes