Bird Technologies 8640B Series - Manual (Page 27)

Bird 8640 Series Moduload RF Load Resistor
16
1. Get a clean container, with a capacity of 3 gal. (11 L), to hold the
old coolant.
2. Remove the filler cap on top of the heat exchanger. This will allow
the coolant to drain faster.
3. Unscrew and remove the drain plug on the rear of the load. Drain
the coolant into the container.
NOTE: If the coolant has no contaminants it may be reused.
4. Replace the drain plug and screw it tightly into place.
5. Remove the filler cap on top of the heat exchanger.
6. Add about 3 quarts (2.9 L) of coolant.
7. Turn the unit on for a few seconds to draw coolant into the system.
8. Repeat steps 6 and 7 twice more, until the the coolant remains
steady at or just below the high mark on the level gauge.
9. Replace the filler cap.
10. Turn the unit on and run it for five minutes to remove any air
trapped in the system.
Coolant Flush
If the coolant is contaminated, for example by pipe sealant or a
broken resistor, the system should be thoroughly flushed. To do this:
1. Fill the unit with clean, potable water.
2. Run the unit for five minutes with no RF power applied.
3. Drain the coolant and discard it.
4. Repeat steps 1 – 3 until the drained liquid is clear.
5. Refill the system with proper coolant (distilled water or a distilled
water/ethylene glycol mixture) as described above.
Repair
Fuse
1. Correct the fuse burnout cause.
2. Use a flat blade screwdriver to lift the tab securing the fuse
drawer, above the ac mains connector.
WARNING
Disconnect the unit from all power sources before servicing.
The unit may be energized from multiple sources.
The potential for electric shock exists.