Bird Technologies 8630B Series - Manual (Page 25)

Installation
9
3. Pour approximately 4 pints (2.0 Liters) of coolant in the unit.
4. 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. Do not run the pump too long, as partially dry operation may
damage its mechanism.
Note: A convenientt method is to watch the coolant level through
the reservoir filler. Stop the pump when the coolant level
approaches the bottom of the tank.
5. Repeat filling in the above manner twice more, with about 3 pints
(1.5 liters) each time, or until the fluid remains steady at the
proper level. The unit should be full to a level of about 2-7/8 inches
(73 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.
6. Run the unit for about five minutes to remove any trapped air in
the system.
7. 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 . The electrical performance of the load is affected by
impurities or other chemical additives in the cooling liquid. Therefore,
the cooling liquid should be distilled water, with pure industrial grade
ethylene glycol added if required, and should be kept clean at all times.
Introducing contaminates from unsuitable coolant liquids could coat
the cooling system components, particularly the resistor surface. This
would unfavorably 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, with an improper water supply. If the coolant system has been
contaminated, flush it out according to the instructions in the
Maintenance Chapter.
Blower Fan The fan is wired direct to the ac line input and will always operate
along with the pump when the ac line power is turned on.
DC Resistance Before the unit is put into operation, check the DC resistance. Refer
to the Maintenance chapter for complete details and instructions.