Conair MPA, MPW manual Replacing the Freezestat

Page 74

REPLACING THE FREEZESTAT

WARNING: Electrical shock hazard

Before attempting maintenance of any kind, stop the unit and disconnect and lock out the main power supply.

The freezestat unit is a bulb and capillary thermostat. To replace the unit:

1 Shut down the chiller and disconnect the process fluid lines.

 

2

 

Disconnect and lockout the power supply.

 

 

 

Drain the tank

 

 

 

 

 

3

 

 

 

 

 

 

 

 

of all fluid through

 

 

 

 

 

 

 

the drain valve in the

 

 

 

 

 

 

 

base of the tank.

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

Locate the

 

 

 

 

 

 

 

freezestat bulb.

 

 

 

 

 

 

 

The bulb sensor is

 

 

 

 

 

 

 

located on the

 

 

 

 

 

 

 

process piping just

 

 

 

 

 

 

 

Drain valve

 

 

 

 

 

 

after the evaporator.

 

 

 

 

 

 

 

 

Evaporator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remove the insulation around the bulb.

 

5

 

 

 

 

Detach the bulb from the process line.

 

6

 

 

 

 

 

 

 

 

 

7

 

Open the chiller electrical enclosure and locate

 

 

 

the freezestat unit.

 

 

 

 

 

 

 

Disconnect freezestat unit wires from their ter-

 

8

 

 

 

 

minals. Mark the wires so that you can easily reconnect

 

 

 

the new unit to the appropriate terminals..

 

 

 

 

 

 

 

 

9

 

Loosen the screws holding the freezestat unit to

 

 

 

the electrical panel.

 

 

 

 

 

 

 

10

 

Remove the entire freezestat unit.

 

 

 

Threat the bulb and capillary through the raceway.

 

 

 

11

 

Reverse the process to install the new unit. Be

 

 

 

sure to insert the bulb sensor completely into the process

 

 

 

piping well and replace the insulation around the bulb.

6-18

TROUBLESHOOTING

microKool Portable Chillers

UGH004/0999

Page 73 Page 75
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Page 73 Page 75
Contents Page Date Manual Number UGH004/0999 Serial numbers Model numbers Table of Contents IntroductionTroubleshooting Introduction Your Responsibility AS a User Purpose User GuideHOW Guide is Organized Read this SO no ONE Gets Hurt Page Description Typical Applications What is the MicrokoolCHILLER? 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 MicroKool Portable Chillers come fully assembled UnpackingBoxes Install plumbing for process and cooling lines Preparing for InstallationMake sure the installation area provides 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 sealantConnecting Main Power Supply Open the unit’s electrical enclosureTurn on the condenser water supply MPW Testing the InstallationApply power to the unit 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 toSelect a new passcode using Disconnect and lock out main power to the unitOpen the electrical enclosure Set dip switch 3 to on Setpoint adjustment buttonsFollow Steps 1 through 5 Press the RUN button to save the passcodeOpen the electrical 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 deviceTo disable Auto Start Set dip switch 4 to the on positionWhen Auto Start is enabled Connect the host machine to the chiller Apply power to the chiller Enter the passcode, if necessaryActivating SPI Communication Enter the node addressOperation PC-1 Control Features Setpoint displayPC-2 Control Features Pumpdown On/OffTo lower the control panel Positioning Control PanelTo raise and swivel 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 passcodeTo shut down the unit Press Stop Using Pumpdown FeatureStopping the Chiller 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 CondensersTo fill the reservoir Refilling the TankLocate the fill port at Back of the chiller Checking Refrigerant Charge If the charge is low, recharge the systemPress To shut down the chiller Set dip switches 3Performing System Tests Then open the electrical enclosureKEY/DISPLAY Test Press any key to display the first test menus Input TestConnect all inputs to the system Select the Input Test menuSelect the Output Test menu Output TestConnect all outputs to the system Save changes and exit the output menu Select the OM Enable/Disable menuDisabling or Enabling Output Monitors Calibrating Temperature Sensors Release the Setpoint keyWait until the control displays don or bad Exit Calibration ModePress the up key to begin calibrating Press SelectExit the Operating Hours Log Logging Operating HoursIndex through test menus to the operating log Troubleshooting Verify that you have manuals for other equip Before BeginningFEW Words Messages shown on the control panel. TheseHOW to Identify Cause of a ProblemIs the required water flow Supplied to the pumpMotor? Greater than the pump’sIs 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 unitsFreeze Stat Input is open Is there sufficient fluid Is the freezestat settingInstalled correctly? Flow through he evaporaIs 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 motherLocate the pump overload module attached Resetting OverloadsCheck the overload Replacing the Motherboard Remove and discard the old contactor Reverse this procedure to install the new conReplacing Compressor 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
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