IM 25.055AC UA (C/6-01)
AUTOMATIC CHLORINATOR - 3000LB/24HR
37
b. With the injector still operating, turn off the gas at the supply con-
tainer valve. In a few moments the vacuum gauge should indicate 100
inches of water and the indicator on the front of the vacuum regulator
should move to the EMPTY position. After initially rising, the rota-
meter float will sink lower and lower in the tube until finally it is
resting on the bottom stop. Decrease the feed rate if necessary to
prevent the float from bouncing violently and damaging the glass tube.
An incorrect vacuum reading indicates either inadequate injector
vacuum or an air leak into the system. Failure of the float to settle
down indicates an air leak somewhere upstream of the rotameter.
c. When the vacuum level is 100 inches of water and the rotameter float
has settled down, turn off the injector operating water. A rapid de-
crease in vacuum indicates an air leak somewhere in the system.
d. If the system is equipped with automatic switchover units, operate
the gas feeder with only one unit turned on. Turn on the second unit
and then close the supply container valve on the container originally
feeding. The vacuum level will momentarily increase and then de-
crease and the gray knob on the front of the second unit should be
observed to snap down as it assumes the feeding function. Repeat the
procedure reversing which container is turned on first to check that
the opposite one will also pull in automatically. If either unit does not
switch on automatically, refer to the vacuum regulator instruction
book.
e. Close the supply container valve(s). Shut off the injector and let nor-
mal backpressure remain. Remove the tubing from the gas inlet con-
nection at the injector. Note if any water drips from the end of the
disconnected tubing (there should be none) and leave the tubing dis-
connected for approximately 10 minutes. Note if any water appears
at the outer end of the connection fitting on the injector. If any water
is seen, service the injector back check.
f. With the injector shut off and the supply container valve closed, turn
the vacuum regulator off. Remove the tubing from its connection on
the unit. Check for leaks per paragraph 4.1.1, Checking for Leaks, to
verify that the unit shuts off tightly (no white vapors). A slight trace of
vapor at the moment of disconnection may be ignored but any con-
tinuing vapor formation is an indication of gas passing the valve seat.
If continuing vapor formation is observed, service the unit stem and
seat parts.
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