Bird Technologies 8329-300 - Manual (Page 30)

4. Install the four screws that were pre-
viously removed.
Coolant
The level of the dielectric coolant should remain constant in
the unit after prolonged usage under normal operating con-
ditions. As shipped, the coolant is at a factory determined
level, and should be about 3-1/4" (82.5mm) below the surface
of the thermoswitch hole, with the unit in a vertical posi-
tion. However, loss of up to 10% of the full tank capacity
should not impair the operating efficiency of the attenuator.
The coolant should be a light yellow color. If it is dark and
not a light yellow, it may be contaminated and should be re-
placed. Occasionally inspect around the clamping band at
the input end for possible coolant leakage. Tighten the
clamping screw if necessary, and make certain the O-Ring
seal is in good condition; i.e., soft and pliable and free from
surface cracks.
Adding
Coolant
Add coolant through the pipe plug hole (thermoswitch hole)
until it reaches the proper level, about 3-1/4 inches below
the surface of the hole. Do not overfill the unit beyond the
recommended level.
Replacing
Coolant
To replace all of the coolant use the following procedure:
1. Remove the rear (output) connector.
2. Replace the vent plug with the ship-
ping plug.
3. Carefully raise the unit by its front
handle and foot until it is tipped up on
its back.
4. Position the load on the bench top so
that the entire rear connector assem-
bly, minus the connector, projects over
the edge of the bench. Brace it verti-
cally in this position so that it will not
topple over.
5. Place a clean container for liquid just
under the rear connector assembly to
receive the coolant. The volume of the
coolant is 2.9 gallons (11 liters), so the
container must be at least a three gal-
lon size, and preferably five gallons.
Bird Model 8329-300 Tenuline Attenuator
20