These valves are in the inlet and outlet of the water circulating system and
must, of course, be open during operation of the transmitter. Th ese valves are
closed when removing the No. 228-A Vacuum Tube from its socket.
A strainer is provided in the water line ahead of the vacuum tube water
j acket. Th is strainer, wh ich is accessible by removing the front panel at the
bottom of the Amplifier Unit, should be cleaned at frequent intervals.
The water pump is of a s ingle stage, rotary impeller type, having vanes
that extend into the water channel. The impeller is fastened to
<1
shaft wh ich
revolves in two out-board ball bearings. The vanes attached to the impeller
rotate in very close proximity to the pump casing, thereby causing a wate1· seal
to be formed wh ich increases and Ernintains the pressu re in the wate1· ch annel .
A strainer is installed at the inlet to the pump to prevent foreign material .
which might enter into the piping system during installat ion or thereafter,
from entering the pump channel and damaging the vanes. The wire mesh
strainer basket contained within the strainer casing should be inspected and
cleaned frequently. Access to the strainer basket is obtained by removing the
cover or pl ug from the top of the strainer casing.
The pump is direct-connected to a one-half horse power motor through a
noiseless flexible coupling, both being mounted on the same base.
The radiator is a standard hot-water radiator of 135 square feet of radi
ating surface, consisting of 30 sections, 38 inches h igh, and has an overall
length of 5 feet 7 1/2 inches. The radiator is tapped for 1-inch p i pe, top and bot-
M O T O R
S T U F F I N G
B O X
D I R E C T I O N O F
R O T A T I O N
No. KS-3068
vVater
Pump
( 51 ]
I N L E T
ST R A I N E R
H O U S I N G
