Bird Technologies 6730B Series - Manual (Page 18)

heated coolant rises by more than a few pounds above at-
mospheric pressure. By this means, the pressure is re-
lieved while at the same time foreign materials are
prevented from entering the tank and contaminating the
dielectric coolant. When these wattmeters leave the fac-
tory, the vent opening is sealed with a shipping plug
which is attached to the vent plug by a length of beaded
chain. Before putting the unit in operation, be sure to re-
move the shipping plug and replace it with the vent plug.
Retain the shipping plug with its O-Ring for future use
should it become necessary to transport the load again.
Models 6734B030, 6736-030A and 6737-030A utilize a
special low frequency line section, P/N 6734-034, which
can also be ordered as an accessory to Models 6734B,
6736A and 6737A. To mount the 6734-034 in place, first
remove the existing line section. Do this by unscrewing
the dc cable from the voltmeter block. Next remove the
four screws from the corners of the flange that is bolted
to the face of the load portion. If the low frequency line
section is not already equipped with its own “QC” connec-
tor, then remove the connector from the existing line sec-
tion. Do this by loosening the four screws from the
corners of the mounting flange and pull the connector
straight out. Install it on the low frequency line section
by carefully inserting the pin on the back end of the con-
nector into the hole on the face of the line section. Then
press the connector into place. Return the four mounting
screws to fasten the connector in position. Now remount
the line section onto the load and fasten it in place with
its four mounting screws. Finally, reattach the dc cable
from the meter to the voltmeter block.
Installing
the Thermo-
switch
On the Model 6735-300A, an overtemperature
thermoswitch, P/N 2450-056, is available as an accessory.
If ordered as part of the original equipment it is factory
installed. If ordered later it must be field installed; pro-
ceed as follows:
Bird Model 6730B Series Termaline Wattmeter
10