IM 25.055AC UA (C/6-01)
AUTOMATIC CHLORINATOR - 3000LB/24HR
41
WARNING: TO AVOID POSSIBLE SEVERE PERSONAL INJURY
OR EQUIP-MENT DAMAGE WHEN USING HYDROCHLORIC
ACID, OBSERVE ALL SAFETY PRECAUTIONS RECOM-
MENDED BY THE ACID MANUFACTURER/SUPPLIER.
If the upstream strainer becomes corroded or perforated and passes a small
pebble or other tramp material, such particles can partially plug the throat
and prevent adequate flow. Water containing suspended silt or sand par-
ticles can erode the opening in the throat. As this opening is enlarged, the
water velocity decreases, thereby decreasing the vacuum developed.
The injector should develop a dynamic vacuum of at least six inches of
mercury at maximum capacity flow rate. At lower gas feed rates it tends
to be higher for the same hydraulic conditions. With the gas completely
shut off, the static vacuum should be about 25 to 28 inches of mercury.
If the gas feeder fails to operate, inadequate vacuum is the most common
reason and the injector is the first place to check. Proceed as described in
Paragraph 4.12.7, Troubleshooting.
4.11.6 Cleaning 3/4" Fixed Throat Injector (Standard) (See Dwg. 25.200.002.010)
The check valve prevents water from the injector from being drawn back
by the vacuum prevailing at shutdown into the control unit and toward the
vacuum regulator during the OFF period.
In continuous or nearly continuous operation, this valve is actuated very
little, and the recommended annual check is principally to ensure cleanli-
ness. In automatic start-stop operation, the check valve can accumulate
thousands of opening and closing cycles in six months or less and wear
becomes a consideration in addition to clean surfaces. For either interval
the procedure is as follows:
• Cleaning Injector Unit Diaphragm Backcheck.
a. Shut off injector operating water.
b. Take steps to prevent water flowing back toward the injector from
the point of application.
c. Unscrew gas line tubing nut and remove tubing.
d. Unscrew injector body union nut (10).
!
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