IM 25.055AC UA (C/6-01)
AUTOMATIC CHLORINATOR - 3000LB/24HR
23
the pump is off. In this manner, the gas feeder is prevented from delivering
gas to the point of application unless the pump is operating.
3.2.6 Preparation for Winter Shut-Down
If the gas feeder is to be shut down for an extended period during freezing
weather, the following procedure must be followed:
a. Operate the injector with the gas supply turned off at the supply con-
tainer valve(s) until the supply vacuum gauge reads 100 inches of
water, then turn off the vacuum regulator. Continue injector opera-
tion for at least three minutes to remove all gas from the machine.
b. Shut off the water supply and drain the line to the injector.
c. Drain the solution discharge line and prevent any water flow into the
line.
d. Drain any water in the injector.
NOTE: If the control module is to be removed for storage, seal the gas
inlet fitting and all gas lines with rubber stoppers to prevent the
entrance of atmospheric moisture during the storage period. If a
pump is used, follow the pump manufacturer instructions for ex-
tended shutdown.
3.3 Theory of Operation
USF/W&T Gas Feeders and accessories are designed to control and indi-
cate the rate of flow of chlorine, to provide a simple means of manually
setting the feed rate at any value within the range of the machine, to mix
the gas with water, and to deliver the resultant solution to the point of
application. This equipment operates in response to an external electrical
signal, but a simple release mechanism permits the operator to assume
manual control at any time (see Dwg. 40.300.170.010).
In the gas feeder described in this manual, the function of the injector is to
produce a vacuum to draw gas from the control module and to mix this gas
with the water flowing through the injector. A diaphragm check is built into
the injector to prevent a back flow of water into the control module if the
injector water supply is shut off with pressure on the injector discharge or
if the injector discharge line is restricted. Proper operation of the injector
is dependent on the inlet pressure being sufficiently higher than the dis-
charge pressure. In the control module, the differential regulating valve
throttles the injector vacuum to maintain a constant drop across the V-
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