Wallace & Tiernan SERIES V-2000, Manual

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WT.025.055.004.UA.IM.0814
MANUAL CHLORINATOR - 3000LB/24HR
EVOQUA W3T109620
4.11.4 Cleaning V-Notch Plug (See Dwg. 25.055.000.052)
The same contaminants seen in the rotameter are in the gas stream flowing
through the V-notch orifice and may also deposit at this point. When the rota-
meter is cleaned, clean the V-notch plug at the same time. If, at any time, float
movement in the rotameter is not proportional to V-notch plug adjustment, as
shown by a sudden marked rise or drop for a small amount of plug adjustment,
the V-notch plug requires cleaning.
a. Turn the knob on the vacuum regulator(s) to OFF. After the supply vacuum
gauge reads 100 inches of water and the rotameter float rests on the bot-
tom stop, shut off the injector water supply.
b. Remove the V-notch assembly completely from the control module.
c. Using running water or a cup full of water and a small, stiff brush (such as
a toothbrush), scrub out the V-notch groove and the shank of the plug.
Do not use a knife, a scraper, or a file to clean out the groove. Dissolving
action and scrubbing are all that is required.
WARNING: DO NOT USE HYDROCARBONS OR ALCOHOLS BECAUSE RESID-
UAL SOLVENT MAY REACT WITH THE GAS. SOLVENTS CAN PRODUCE SERI-
OUS PHYSIOLOGICAL EFFECTS UNLESS USED IN STRICTEST COMPLIANCE
WITH THE SOLVENT MANUFACTURER’S SAFETY RECOMMENDATIONS.
d. Dry the plug with a clean cloth or paper towel.
e. Remove the seal, the clamping screw (36), and the extension chamber.
Clean and inspect the orifice and the O-ring (40) and replace them, if
necessary.
f. Wipe a thin film of Halocarbon grease on the gaskets of the V-notch as-
sembly. Reinstall it in the control module and resume operation.
4.11.5 Cleaning Injector Throat and Tailway
The injector will not operate properly unless all the ports are clear. This point
is easily checked visually after the throat has been removed.
Water containing carbonates, manganese, or iron will frequently leave a deposit
in injector tailways. As this deposit increases in thickness, it can become scaly
or rough and adversely affect pressure recovery or increase backpressure so
that the injector fails to develop adequate operating vacuum. Such deposits are
readily recognizable by their black or reddish color. They may be removed by
immersing the throats in dilute (10%) hydrochloric acid, known commercially
as muriatic acid.
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