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x i Continue manual control and actuate the supernatant transfer(SNT) pump. If the liquor in the clarifier has not had adequate time to settle,nit should not be transferred to the chlorine contact chamber. In this case, the function of the supernatant transfer pump should be checked only momentarily by quickly turning the switch ON, then OFF. Next, the sludge return (SLR) pump should be actuated. This is the last phase of the processing cycle and under manually controlled conditions, the sludge return pump should be allowed to run until clarifier is completely emptied. Then system will return to standby, where the only operation is intermittent aeration controlled by the PC. However, when the liquid level in the aeration chamber is above the standby level switch, power will be supplied to the MLT pumps, thus starting another batch through a time-controlled cycle. D. NORMAL OPERATIONAL CHECKING $ Operation and condition of all components' of the system should be observed through a normal time-controlled cycle once a week` in order to assure troublefree performance. During such a cycle, each component should be checked as follows: 1. Aeration pump: Observe operation of this pump to verify that it is running smoothly and creating a vigorous agitation of liquor in the aeration chamber. If the pump is not performing satisfactorily, it should be removed and serviced in accordance with instructions in the troubleshooting procedure. The air tube should be flushed out with water by directing a water hose into the inlet while the pump is operating. (Not applicable to large systems using external compressors.) 2. Aeration chamber: Visually inspect the disintegrator basket, if installed, for hales. f Remove any nonsoluble objects which may have entered the basket. Check all support brackets, piping and wiring. Wash down the walls when liquid level is low. 3. Mixed liquor transfer pump: Observe operation of this pump to verify that it is running smoothly and delivering the required volume within the time span allowed. if flow rate is insufficient, the PC should be adjusted to increase operating time, or the pump should be removed and serviced�in accordance with instructions in the trouble- shooting procedure. 4. Discharge pump: Observe operation of this pump to verify that it is running smoothly and pumping enough volume to lower, liquid to proper level before shutting off. If necessary, pump should be removed aknd serviced in accordance with instructions in the troubleshooting procedure. This discharge line should be checked for leaks. In the event that this pump is feeding tertiary filters, care should be taken (if manually operating the pump) to ensure that fl ow-controll valve on filter is set in the RUN mode. E, k� 5. Chlorine contact chamber: Visually inspect chlorine feed system and add addi- tional chlorine if necessary. At completion of the effluent discharge cycle, wash down the walls, pumps, and sump while chamber is nearly empty. 6. Chlorine return pump: Some installations do not require this pump. If it is installed, it should be observed in operation to verify that it is running smoothly and delivering the required volume before shutting off. If necessary, the pump should be removed and serviced in accordance with instructions in the troubleshooting procedure. 3