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Bird Technologies 8329-300 User Manual

Page 19

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Thermo-

switch

As an optional item, the attenuator can be provided with a

thermoswitch assembly (P/N 8329-028). When the ther-

moswitch is installed, it prevents possible damage from acci-

dental power overloading from the transmitter or

equipment malfunction. The thermoswitch is normally

closed and opens at a maximum safe temperature of +200°C
(+392°F). Since the thermoswitch is connected in series with
the transmitter interlock, it cuts off the transmitter power if

the coolant temperature exceeds this value. The assembly

consists of:

s

Thermoswitch body - P/N 8329-027

s

Coupling Jack - P/N 2450-018

If the thermoswitch is to be field installed, proceed as fol-

lows:

1. Replace the vent plug with the ship-

ping 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.

9

Operating Instructions

O-ring seal

Figure 2

Shipping Plug

O-Ring Seal

Figure 3

Vent Plug