Bird Technologies 8890-400 Series - Manuale (Pagina 22)

Thermoswitch As an optional item, the dummy load may be provided with
an interlock thermoswitch assembly, P/N 8890-008. When
installed in the radiator, it will prevent possible damage oc-
curring from accidental transmitted power overload or
equipment malfunction. Being normally closed, the ther-
moswitch opens at a maximum safe temperature of +236°C
(+457°F). Connected in series with the transmitted inter-
lock, it cuts off transmitter power if the coolant temperature
exceed this value. The assembly consists of a thermoswitch
body, P/N 8890-005 with a coupling jack, P/N 2450-018 at-
tached.
WARNING
Before placing the unit into operation, remove the
shipping plug at the top of radiator, near front,
substitute with the specially shielded breather plug.
Use a 3/4 inch flat wrench for this purpose - do not
lose the O-Ring Seal.
This vent hole must remain open 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. The use of the vent plug also
protects the filler opening against intrusion of foreign
material while allowing unobstructed venting of the
tank. The shipping plug (with O-Ring seal) should be
put back in place whenever the unit is to be
transported. Be sure to check this plug.
To field install the thermoswitch, follow these instructions:
1. Replace the vent plug with the shipping plug
first, refer to figures 5 and 6 for identification
of plugs.
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Bird Model 8890-400 Series Termaline Wattmeter
O-ring seal
Figure 5
Shipping Plug