Calibrating Temperature Sensors | Conair MPA, MPW guide

CALIBRATING

TEMPERATURE

SENSORS

Special Tools Needed:

❒thermocouple calibrator

The microKool chillers use thermocouples to sense the tem- perature in the return and supply process lines. These thermo- couples should be calibrated annually, or when a new thermo- couple is installed, to ensure correct operation.

The chiller’s Calibration Mode provides zero and span calibra- tion of both the supply and return line thermocouples. You access the Calibration Mode while in Test Mode.

1 Enable Test Mode.

See PERFORMING SYSTEM TESTS.

2 Press any button to display the first test menu. 3 Select the Calibration Mode menu.

Press and hold the Setpoint key for 3 seconds to index to each test menu until the controller indicates “SC.L” in the Actual display.

4

Release the Setpoint key.

You are now in calibration mode. Each press and release of this key will exit the current calibration and start the next calibration. The table below lists the calibrations that will be performed.

	SETPOINT	ACTUAL
CALIBRATION	DISPLAY	DISPLAY
Zero Calibrate Supply Sensor	32° F (0° C)	SC.L

Zero Calibrate Return Sensor	32° F (0° C)	rC.L

Span Calibrate Supply Sensor	510° F (266° C)	SC.H

Span Calibrate Return Sensor	510° F (266° C)	rC.H

5

Using the thermocouple calibrator, apply the appropriate temperature to the control input.

5-12

MAINTENANCE

microKool Portable Chillers

UGH004/0999

Image 54

Conair MPA, MPW manual Calibrating Temperature Sensors, Release the Setpoint key

Contents

Page Date Manual Number UGH004/0999 Serial numbers Model numbers Table of Contents Introduction Troubleshooting 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 Compressors Specifications MPW Water Cooled Psi Pressure Specifications MPA AIR Cooled MPA-5 Freezing Points of Aqueous Ethylene Glycol Solutions Freeze Protection Requirements Installation Unpacking BoxesMicroKool Portable Chillers come fully assembled Preparing for Installation Make sure the installation area providesInstall plumbing for process and cooling lines Remove the shipping pipe plug from the female Connecting Process Water Supply LinesInstall pipe to the rear of the chiller Coat the pipe threads with thread sealant Connecting Main Power Supply Open the unit’s electrical enclosure Turn on the condenser water supply MPW Testing the InstallationApply power to the unit 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 Select a new passcode using Disconnect and lock out main power to the unitOpen the electrical enclosure Set dip switch 3 to on Setpoint adjustment buttons Press 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 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 Set dip switch 4 to the on position When Auto Start is enabledTo disable Auto Start Connect the host machine to the chiller Apply power to the chiller Enter the passcode, if necessaryActivating SPI Communication Enter the node address Operation PC-1 Control Features Setpoint display PC-2 Control Features Pumpdown On/Off To lower the control panel Positioning Control PanelTo raise and swivel 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 To shut down the unit Press Stop Using Pumpdown FeatureStopping the Chiller 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 Refilling the Tank Locate the fill port at Back of the chillerTo fill the reservoir Checking Refrigerant Charge If the charge is low, recharge the system Press To shut down the chiller Set dip switches 3Performing System Tests Then open the electrical enclosure KEY/DISPLAY Test Press any key to display the first test menus Input TestConnect all inputs to the system Select the Input Test menu Output 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 key Wait until the control displays don or bad Exit Calibration ModePress the up key to begin calibrating Press Select Logging Operating Hours Index through test menus to the operating logExit the Operating Hours Log Troubleshooting Verify that you have manuals for other equip Before BeginningFEW Words Messages shown on the control panel. These HOW to Identify Cause of a Problem Is the required water flow Supplied to the pumpMotor? Greater than the pump’s Is the thermocouple Loose? Has one of the main sup Ply wire leads becomeLevel Switch fuse Has the indicated device Disconnected? Compressor All models Shut Down AlarmsRefrigerant pressure is either too low or too high Air-cooled units Freeze Stat Input is open Is there sufficient fluid Is the freezestat settingInstalled correctly? Flow through he evapora Is something wrong with Cable? System Alarms Chiller Will not Power UP On the front panel counterclockwise to open Checking Replacing FusesIf fuses continue to fail Replace the fuse. The fuses are located on the mother Resetting 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, 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