Bird Technologies 8327-300 User Manual

Page 16

Vent Plug

WARNING

The vent plug must be used at all times when the unit is in operation or cooling. Failure to

do this could result in damage to the equipment and endanger the operator’s safety. Be

sure to check this plug.

Before placing the attenuator into service, the solid shipping plug, P/N 2450-049,
must be removed and replaced by the spring loaded vent plug, P/N 2450-094. The
vent hole for these plugs is located at the top left hand side near the front. The two
plugs are linked together by a short length of bead chain. The shipping plug should
be placed back in the vent hole whenever the attenuator is to be shipped. Be careful
not to lose the O-Ring seal. Refer to figures 2 and 3.

Thermoswitch

As an optional item, the attenuator can be provided with a thermoswitch assembly,
P/N 2450-056. When the thermoswitch is installed, it prevents possible damage from
accidental power overloading from the transmitter or equipment malfunction. The
thermoswitch is normally closed and opens at a maximum safe temperature. Since
the thermoswitch is connected in series with the transmitter interlock, it cuts off
transmitter power if the coolant temperature exceeds this value. The assembly
consists of:

s Thermoswitch body - P/N 2450-040
s Coupling Jack - P/N 2450-018

If the thermoswitch is to be field installed, proceed as follows:

1. Replace the vent plug with the shipping plug.

2. Stand the unit on its back end with the input connector end up.

Note: In this position there is no danger of the coolant pouring out through the
socket plug hole.

3. Remove the socket plug located just above the connector on the front

face of the radiator. Use a 9/16 hex wrench. Refer to figure 1.

4. Replace the plug with the thermoswitch. Use an acceptable pipe

sealing compound sparingly on

only the external threads of the

thermoswitch.

Note: Do not contaminate the coolant with pipe sealing compound.

5. Check the unit for coolant leaks.

O-ring seal

Figure 2

Shipping Plug

O-Ring Seal

Figure 3

Vent Plug

Bird Model 8327-300 Attenuator