Bird Technologies SCC8 Series-Manual - Manual (Page 38)

Maintenance
24
Replacing the Resistor
1. Insert the new resistor [1] into the resistor fitting of the center conductor
assembly [15] to test its tightness.
 Note: The resistor should be snug but should not have to be forced
into the fitting. If the resistor is too loose:
a. Press the fitting fingers together slightly
b. Insert the resistor again.
c. Continue closing the ends of the resistor fitting until a snug fit
is obtained.
2. Bottom the resistor in the fitting.
3. Insert the resistor and center conductor assembly into the housing.
4. Replace the outer conductor assembly [12] and screw it into place.
5. Stand the load on its end with the RF connector down.
6. Replace the ground cap assembly onto the exposed end of the resistor.
 Note: Make sue that it seats on the load housing.
7. Do one of the following:
z If the inner flow tube [9] is separated from the water chamber assembly [3]:
a. Place it inside the resistor
b. Lower until it reaches the resistor fitting.
c. Twist, gently, the flow tube until it seats in the bottom of the resis-
tor fitting.
z If the inner flow tube [9] is not separated from the water chamber
assembly [3], procedd to Step 4.
4. 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.
 Note: Make sure the counterbore faces the O-Ring and the resistor.
5. 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.
6. Tighten the water chamber screws [6].
7. Check the DC resistance between the inner and outer conductors; it
should be about 50 ohms.
 Note: Record this measurement as the new baseline reading.
8. Install the resistor assembly on the heat exchanger.
9. Connect the hoses and fill with coolant.
10. Run the pump for five minutes and check for leaks before applying RF
power.