Bird Technologies 8640B Series - Manual (Page 36)

Maintenance
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6. Remove the inner flow tube [9] and ground cap assembly [10].
Check them for broken pieces.
7. Under clear running water, thoroughly wash the inside of the
conductor assemblies, load housing, and water chamber.
8. Replace the ground cap assembly and the inner flow tube.
Resistor
Replacement
1. Insert the new resistor [1] into the resistor fitting of the center
conductor assembly [15] to test its tightness.
2. The resistor should be snug but should not have to be forced into
the fitting. If the resistor is too loose, press the fitting fingers
together slightly and try the resistor again. Continue closing the
ends of the resistor fitting until a snug fit is obtained.
3. Bottom the resistor in the fitting.
4. Insert the resistor and the center conductor assembly into the
load housing.
5. Replace the outer conductor assembly [12] and screw it into place.
6. Stand the load on its end with the RF connector down.
7. Replace the ground cap assembly onto the exposed end of the
resistor. Make sure that it seats on the load housing.
8. If the inner flow tube [9] is separated from the water chamber
assembly [3], place it inside the resistor and lower until it reaches
the resistor fitting. Gently twist the flow tube until it seats in the
bottom of the resistor fitting.
9. Check that the O-Ring [8] is on the inner flow tube next to the
resistor and the resistor sleeve [7] is right behind it. Make sure
the counterbore faces the O-Ring and the resistor.
10. Replace the water chamber [3], gently rocking and twisting the
chamber to achieve a flat seat on the outer housing.
NOTE: If the water chamber does not fit properly make sure that
the inner flow tube is properly placed.
11. Tighten the water chamber screws [6].
12. Check the dc resistance between the inner and outer conductors;
it should be about 50 ohms. Record this measurement as the new
baseline reading.
13. Install the load on the heat exchanger. Connect the hoses and fill
with coolant.