3.Disconnect the gas Hose Assembly from the fitting at the end of the Gas Input Fitting.

4.Remove the fitting screwed into the end of the Gas Input Fitting.

5.Remove the first nut from the Gas Input Fitting.

6.Remove the second nut securing the Gas Input Fit- ting to the Upper Chassis/Gauge Assembly.

7.Pull the fitting from the Upper Chassis/Gauge As- sembly.

7.Reinstall the replacement Plasma or Secondary Gas Input Fitting Assembly by reversing the above pro- cedure.

H.Fuse (F1 and F2) Replacement

1.Open the hinged cover at the Front Panel torch leads connection area.

2.Locate and remove the cap from the fuse holder.

3.Pull the faulty Fuse from the fuse holder.

4.Install the replacement Fuse by reversing the above procedure.

I.Plasma or Secondary Regulator Assembly Replacement

NOTE

Both the Plasma and Secondary Regulator Assem- blies are replaced in the same manner

1.Remove the Top Panel per Section 5.04-B.

2.Carefully remove the input and output gas Hose Assemblies to the Regulator Assembly.

3.On the Upper Ghassis/Gauge Assembly remove the securing nut for the Regulator Assembly.

4.Slide the Regulator Assembly.out of rear of the Upper Ghassis/Gauge Assembly.

5.Remove the fittings from the old Regulator Assem- bly.

6.Reinstall the replacement Regulator Assembly by reversing the above procedure.

J.Control Logic PC Board Assembly Replacement

1.Open the front panel access panel cover at the front of the Power Supply.

2.Fasten the access cover open with string or rubber band.

3.Note where each connector is located on the old Control Logic PC Board.

4.Disconnect the three connectors from the old Con- trol Logic PC Board.

5.Note the orientation of the old Control Logic PC Board.

6.Remove the old Control Logic PC Board.

7.On the new Control Logic PC Board set the switches, SW1 through SW5, the same as the old Control Logic PC Board.

8.Install the replacement Control Logic PC Board by reversing the above procedure.

K.Switching Control PC Board Assembly Replacement

1.Remove the Top and Right Side Panels per Section 5.04-B.

2.Note the orientation of the old Switching Control PC Board.

3.Remove the Switching Control PC Board from the rear of the Upper Chassis/Gauge Panel far enough to disconnect the wiring connections.

4.Note where each connector is located on the Switch- ing Control PC Board.

5.Disconnect the connectors from the Switching Con- trol PC Board.

6.Reconnect the original wiring connectors to the replacement Switching Control PC Board before installing the replacement Switching Control PC Board.

7.Install the replacement Switching Control PC Board by reversing the above procedure.

L.Coolant Check Valve Replacement

1.Remove the Top Panel per Section 5.04-B.

2.Disconnect the Hose Assemblies from the fitting connection at the input end of the Check Valve.

3.Carefully remove the Check Valve and fittings from the TORCH COOLANT SUPPLY fitting.

4.Remove the Fittings from the old Check Valve.

NOTE

The input of the replacement Check Valve should be pointing towards the rear of the unit when in- stalled. The output is designated by a symbol on the side of the part as shown in the following Fig- ure.

REPLACEMENT PROCEDURES

44

Manual 0-2533

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Thermal Comfort 3000 manual Fuse F1 and F2 Replacement, Plasma or Secondary Regulator Assembly Replacement

3000 specifications

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