TM 10-4320-303-132.5.5.4 OperationofHypochlorinationUnit:Model1955-1. (Continued)Figure 2-47. Stroke Adjust Thimble Operation.NOTEStroke adjust thimble is marked to measure revolutions. Turning thimble from 0 to 10 equalsone 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. Onecomplete 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 toescape 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 barrelscale (2).(4) Tighten top hose connection (Figure 2-48, 2) on feeder (1).NOTEThirty minute contact time is required to obtain an accurate chlorine residualas 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)2-82
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