Filling the coolant reservoir, Blower fans – Bird Technologies 8650B Series User Manual
Page 22
Bird 8650 Series Moduload RF Load Resistor
10
Filling the Coolant Reservoir
Note:
The Bird 8650R has a coolant capacity of about 17 quarts
(16.1 liters).
1. Ensure the drain plug is in place and that the hose connections are correct
and properly tightened.
2. Remove the filler cap located on the unit’s top.
3. Add about 6 quarts (5.7 liters) of coolant.
4. Replace the filler cap.
5. Turn on the motor, for only a few seconds, to pull the liquid into the
system and draw the coolant level down to the bottom of the tank.
Note:
Do not run the pump too long, as partially dry operation
may damage its mechanism.
Note:
A convent method is to watch the coolant level through the
reservoir filler. Stop the pump when the coolant level approaches the
bottom of the tank.
6. Repeat Steps 1 to 5 twice more, with about 5.5 quarts (5.2 liters) each
time, or until the fluid remains steady at the proper level.
Note:
The unit should be full to a level of about 4-5/8 inches (117
mm) below the top face of the filler tube opening, or to the high mark on
the gauge. Add coolant if necessary to bring to the required level.
7. Run the unit for about five minutes to remove any trapped air in the system.
8. Recheck the fluid level before applying RF power.
Note:
The filler plug is equipped with a breather vent to relieve
internal pressure caused by the heated coolant. It is normally closed,
but is set to open at 2 lb/in
2
.
Introducing contaminates from unsuitable coolant liquids could coat the cool-
ing system components, particularly the resistor surface. This would unfavor-
ably affect the thermal performance and VSWR of the load. When this is
suspected always check the VSWR. General scale accumulation is not likely
unless the load resistor is used outside the unit and with an improper water
supply. If the coolant system has been contaminated, flush it out. See “Flush-
Blower Fans
The fans are wired direct to the AC line and, when activated, operate along with
the pump.In addition to the basic function of producing the required air flow
through the radiators, this ventilation also aids in cooling the pump/motor unit.
CAUTION
Operation without sufficient coolant can damage the unit.