Bird Technologies 8630B Series - Manual (Page 5)

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CAUTION
Before any RF operation of the load is attempted, the transmitter
interlock and ac line attachment to the equipment must be made. First
attach the transmitter interlock connections to the two binding posts on
the front panel and then connect the power cable.
CAUTION
The 115 V or 230 Vac line may be connected, but the ac power must not
be turned on unless coolant is in the system and filled to the correct
level. Damage to the pump will result otherwise.
CAUTION
Operation without sufficient coolant can damage the unit.
CAUTION
Do not use any sealant, leak-stopping material, or automotive antifreeze
in the coolant. Use only distilled water and pure ethylene glycol.
CAUTION
Do not attempt to alter the flow switch setting or disturb the coolant pump.
CAUTION
Do not operate the load without connecting the interlock. Even
momentary application of power to the load while the cooling
circulation is off, or possibly functioning improperly, will cause almost
immediate destruction of the resistor element.
CAUTION
Do not apply more than the rated RF power to the load. Excessive RF
power will damage the load resistor.
CAUTION
Do not block air flow. Air enters the housing through the circular fan
openings and exhausts through the grille opposite.
CAUTION
Do not disconnect the line power first. Even a momentary application of
RF power to the load while the cooling circulation is off will cause
almost immediate destruction of the resistor element.