Conair MPA, MPW Shut Down Alarms, Refrigerant pressure is either too low or too high, All models

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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 turns off the compressor, but normal operation resumes after you clear the alarm or the problem corrects itself.

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

Alarm

Possible cause Solution

Refrigerant Pressure

Refrigerant pressure is either too low or too high.

WARNING:

The microKool should be tested and repaired only by qualified techni- cians equipped with the correct tools and trained in the mainte- nance and repair of electrical and refriger- ant systems used in industrial applications.

Low refrigerant pressure:

Is the refrigerant charge low?

Is the liquid refrigerant line restricted?

High refrigerant pressure

Has the water or air flow through the condenser become restricted?

(Continued on next page)

See CHECKING REFRIGERANT

CHARGE. Check for leaks in the refrigerant circuit. Contact a certified refrigerant technician to repair and recharge the sys- tem.

Check for closed valves or a plugged refrigerant line.

❒Verify that the liquid line shut-off valve is open.

❒Verify that the suction valve at the compressor is open.

❒Verify that the expansion valve is working properly.

Check for closed valves and obstructions, contaminants or dirt that may have blocked or restricted condenser efficiency.

All models:

❒Clean the condenser coils. See

CLEANING CONDENSERS.

Air-cooled units:

❒Remove any obstructions to air flow at the condenser air inlet and outlet.

❒Verify that the condenser fans are working. Confirm proper rotation and check for an elec- trical overload.

Water-cooled units:

❒Check for closed valves or plugged water supply lines.

❒Verify that the condenser water supply is working and that incoming water pressure is at least 25 psi.

6-8

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 HOW Guide is Organized Purpose User GuideYour Responsibility AS a User Read this SO no ONE Gets Hurt Page Description CHILLER? What is the MicrokoolTypical 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 Boxes UnpackingMicroKool Portable Chillers come fully assembled Make sure the installation area provides Preparing for InstallationInstall 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 buttonsOpen the electrical Press the RUN button to save the passcodeFollow 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 deviceWhen Auto Start is enabled Set dip switch 4 to the on positionTo 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 CondensersLocate the fill port at Back of the chiller Refilling the TankTo 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 menuConnect all outputs to the system Output TestSelect the Output Test menu Disabling or Enabling Output Monitors Select the OM Enable/Disable menuSave 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 SelectIndex through test menus to the operating log Logging Operating HoursExit 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 motherCheck the overload Resetting OverloadsLocate the pump overload module attached Replacing the Motherboard Replacing Compressor Contactor Reverse this procedure to install the new conRemove 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