Conair MPA, MPW Supplied to the pump, Motor?, Is the required water flow, Greater than the pump’s

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SHUT DOWN ALARMS

The chiller has detected a problem that could lead to equipment damage or personal injury if it is not corrected.

◆The Alarm LED lights and the STOP/RUN LED flashes red.

◆The chiller automatically shuts down.

◆The control displays a red LED or alarm code indicating the source of the problem.

Alarm

Possible cause Solution

Pump

The pump motor overload has tripped. The contact is open.

Is the correct voltage	Supply voltage should match
supplied to the pump	the rating on the pump name
motor?	plate. If voltage is correct,
	check wiring connections.
Is the required water flow	❒ Review pump sizing
greater than the pump’s	for the application.
capacity?	❒ Decrease the water flow
	from the process.

WARNING:

Only qualified electri- cal service personnel should examine and correct problems that require opening the unit's electrical enclosure or checking electrical current to diagnose the cause of a problem.

Is the motor overload faulty or set incorrectly?

Is the pump working properly?

Disconnect the power and open the electrical enclosure. Verify that the overload is set to trip at the proper amperage, which should not exceed the FLA. Manually trip and reset the overload. If the problem contin- ues, replace the overload. See

RESETTING AND REPLACING OVERLOADS.

Replace the pump if supply voltage, wiring and overload settings are correct, but the pump continues to draw exces- sive current.

Hi SAF

The actual tempera- ture of water supplied to the process is 100° F, or has exceeded 75° F for more than 30 minutes.

Is the refrigerant charge low?

Is the unloader valve stuck open?

Did the compressor fail?

See CHECKING REFRIGERANT

CHARGE. If the charge is low, contact a certified refrigeration technician to recharge.

See CHECKING THE UNLOADER

VALVE. If the valve is stuck open,

contact a certified refrigeration technician to repair.

Check compressor electrical connections. Replace the com- pressor, if it has failed.

6-4

TROUBLESHOOTING

microKool Portable Chillers

UGH004/0999

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Contents Page Date Manual Number UGH004/0999 Serial numbers Model numbers Table of Contents IntroductionTroubleshooting Introduction Purpose User Guide HOW Guide is OrganizedYour Responsibility AS a User Read this SO no ONE Gets Hurt Page Description What is the Microkool CHILLER?Typical Applications HOW IT Works Water Cooled HOW IT Works AIR Cooled Features High Efficiency CompressorsSpecifications MPW Water Cooled Psi PressureSpecifications MPA AIR Cooled MPA-5Freezing Points of Aqueous Ethylene Glycol Solutions Freeze Protection RequirementsInstallation Unpacking BoxesMicroKool Portable Chillers come fully assembled Preparing for Installation Make sure the installation area providesInstall plumbing for process and cooling lines Connecting Process Water Supply Lines Install pipe to the rear of the chillerRemove the shipping pipe plug from the female Coat the pipe threads with thread sealantConnecting Main Power Supply Open the unit’s electrical enclosureTesting the Installation Apply power to the unitTurn on the condenser water supply MPW Units and check for leaks. If any leaks appear, stopEntering Setpoint Deviation Parameters Initial Setup Dip switch ConfigurationChanging Temperature Units Open the electrical enclosure Change Dip Switch 1 toDisconnect and lock out main power to the unit Open the electrical enclosure Set dip switch 3 to onSelect a new passcode using Setpoint adjustment buttonsPress the RUN button to save the passcode Open the electricalFollow Steps 1 through 5 Selecting Temperature Control Point Select a new control point using the Display buttonSet dip switch 5 to Press the RUN button to save the control pointInstalling Auto Start Feature Insert the two power leads from the deviceSet dip switch 4 to the on position When Auto Start is enabledTo disable Auto Start Apply power to the chiller Enter the passcode, if necessary Activating SPI CommunicationConnect the host machine to the chiller Enter the node addressOperation PC-1 Control Features Setpoint displayPC-2 Control Features Pumpdown On/OffPositioning Control Panel To raise and swivel the control panelTo lower the control panel To detach the PC-2 control panelEntering a Passcode Press Setpoint to select the parameter you want to changeStarting the Chiller Enter the passcodeUsing Pumpdown Feature Stopping the ChillerTo shut down the unit Press Stop Press Button to turn on PumpdownPerforming AN Auto Tune Insufficient setpoint/process deviation Page Maintenance Preventative Maintenance Schedule Inspect power cords, wires and electrical connections Quarterly every 3 monthsCleaning Evaporators Cleaning CondensersRefilling the Tank Locate the fill port at Back of the chillerTo fill the reservoir Checking Refrigerant Charge If the charge is low, recharge the systemSet dip switches 3 Performing System TestsPress To shut down the chiller Then open the electrical enclosureKEY/DISPLAY Test Input Test Connect all inputs to the systemPress any key to display the first test menus Select the Input Test menuOutput Test Connect all outputs to the systemSelect the Output Test menu Select the OM Enable/Disable menu Disabling or Enabling Output MonitorsSave changes and exit the output menu Calibrating Temperature Sensors Release the Setpoint keyExit Calibration Mode Press the up key to begin calibratingWait until the control displays don or bad Press SelectLogging Operating Hours Index through test menus to the operating logExit the Operating Hours Log Troubleshooting Before Beginning FEW WordsVerify that you have manuals for other equip Messages shown on the control panel. TheseHOW to Identify Cause of a ProblemSupplied to the pump Motor?Is the required water flow Greater than the pump’sIs the thermocouple Loose?Ply wire leads become Level Switch fuse Has the indicated deviceHas one of the main sup Disconnected?Compressor Shut Down Alarms Refrigerant pressure is either too low or too highAll models Air-cooled unitsIs the freezestat setting Installed correctly?Freeze Stat Input is open Is there sufficient fluid Flow through he evaporaIs something wrong with Cable?System Alarms Chiller Will not Power UP Checking Replacing Fuses If fuses continue to failOn the front panel counterclockwise to open Replace the fuse. The fuses are located on the motherResetting Overloads Check the overloadLocate the pump overload module attached Replacing the Motherboard Reverse this procedure to install the new con Replacing Compressor ContactorRemove and discard the old contactor Checking Unloader Valve Replacing the Freezestat WE’RE Here to Help From outside the United States, callAppendix A-2 SPI Commands Supported by Conair Microkool SPI Command PairsSPI Status Words Status, ProcessStatus, Machine Appendix B-4 PARTS/DIAGRAMS PD-2 PD-3 PD-4 PD-5