Shut Down Alarms, All models, Air-cooled units | Conair MPA, MPW

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.

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TROUBLESHOOTING

microKool Portable Chillers

UGH004/0999

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Conair MPA, MPW manual Shut Down Alarms, Refrigerant pressure is either too low or too high, All models, Air-cooled units

Contents

Page Date Manual Number UGH004/0999 Serial numbers Model numbers Table of Contents Introduction Troubleshooting 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 Compressors Specifications MPW Water Cooled Psi Pressure Specifications MPA AIR Cooled MPA-5 Freezing Points of Aqueous Ethylene Glycol Solutions Freeze Protection Requirements Installation 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 sealant Connecting Main Power Supply Open the unit’s electrical enclosure Testing the Installation Apply power to the unitTurn on the condenser water supply MPW Units and check for leaks. If any leaks appear, stop Entering Setpoint Deviation Parameters Initial Setup Dip switch Configuration Changing Temperature Units Open the electrical enclosure Change Dip Switch 1 to Disconnect and lock out main power to the unit Open the electrical enclosure Set dip switch 3 to onSelect a new passcode using Setpoint adjustment buttons Open 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 button Set dip switch 5 to Press the RUN button to save the control point Installing Auto Start Feature Insert the two power leads from the device When 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 address Operation PC-1 Control Features Setpoint display PC-2 Control Features Pumpdown On/Off Positioning Control Panel To raise and swivel the control panelTo lower the control panel To detach the PC-2 control panel Entering a Passcode Press Setpoint to select the parameter you want to change Starting the Chiller Enter the passcode Using Pumpdown Feature Stopping the ChillerTo shut down the unit Press Stop Press Button to turn on Pumpdown Performing AN Auto Tune Insufficient setpoint/process deviation Page Maintenance Preventative Maintenance Schedule Inspect power cords, wires and electrical connections Quarterly every 3 months Cleaning Evaporators Cleaning Condensers Locate the fill port at Back of the chiller Refilling the TankTo fill the reservoir Checking Refrigerant Charge If the charge is low, recharge the system Set dip switches 3 Performing System TestsPress To shut down the chiller Then open the electrical enclosure KEY/DISPLAY Test Input Test Connect all inputs to the systemPress any key to display the first test menus Select the Input Test menu Connect 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 key Exit Calibration Mode Press the up key to begin calibratingWait until the control displays don or bad Press Select Index 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. These HOW to Identify Cause of a Problem Supplied to the pump Motor?Is the required water flow Greater than the pump’s Is 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 units Is the freezestat setting Installed correctly?Freeze Stat Input is open Is there sufficient fluid Flow through he evapora Is 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 mother Check 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, call Appendix A-2 SPI Commands Supported by Conair Microkool SPI Command Pairs SPI Status Words Status, Process Status, Machine Appendix B-4 PARTS/DIAGRAMS PD-2 PD-3 PD-4 PD-5