TM 10-4320-303-13
2.5.5.4 Operation of Hypochlorination Unit: Model 1955-1. (Continued)
Figure 2-47. Stroke Adjust Thimble Operation.
NOTE
Stroke adjust thimble is marked to measure revolutions. Turning thimble from 0 to 10 equals
one half revolution. Turning thimble from 0 to 20 equals one complete revolution.
One half revolution of thimble equals one number setting on micrometer barrel scale. One
complete revolution of thimble equals two number settings on micrometer barrel scale.
h. Turn stroke adjust thimble (Figure 2-47, 1) left two and one half revolutions. Stroke adjust thimble (1)
will be set at 5 on micrometer barrel scale (2).
i. If hypochlorite feeder (Figure 2-48, 1) becomes air-bound after startup:
(1) Loosen top hose connection (2) on hypochlorite feeder (1).
(2) Set stroke adjust thimble (Figure 2-47, 1) to 10 on micrometer bar scale (2). This allows air to
escape through small vent (Figure 2-48, 3) in top of pump (4).
(3) When air is vented, set stroke adjust thimble (Figure 2-47, 1) back to 5 on micrometer barrel
scale (2).
(4) Tighten top hose connection (Figure 2-48, 2) on feeder (1).
NOTE
Thirty minute contact time is required to obtain an accurate chlorine residual
as prescribed by TB-MED-577 or by area medical officer.
j. After unit operates for 10 minutes, take chlorine residual test, para 2.5.5.7.
k. If residual reading is high:
(1) Turn stroke adjust thimble (Figure 2-47, 1) setting to 2.5 on micrometer barrel scale (2).
(2) Run unit for 10 minutes and take another residual test, para 2.5.5.7.
(3) If reading remains high, add water to reservoir (Figure 2-48, 5)
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