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Caustic transfer pump 1. Make sure the air shut-off valve is operates and the caustic wide open to allow the air flow to circulates,but caustic the 3-way air solenoid valve.Check feeds without responding F/R/L unit for air leaks and to the pH ranges. malfunctions. 2 . If the F/R/L unit is OK and there is no air leaking. Check the 3-way air valves and caustic feeding valves for leaks and damage. Replace if necessary. pH ranges from 0 to 6 1. Turn the caustic feeding valve #2 in pH 02 adjust. tank, switch on the electrical panel to the the caustic transfer pump "MAN" position to energizes the 3-way operates and circulates air solenoid valve #2 . but no caustic feeding. 2 . If there is no caustic feeding,check the 3-way air solenoid valve. If 3-way air solenoid valve is OK,check the caustic feeding valve and ball valve. Replace the valve if necessary. 3 . If the caustic is feeding,check the electrical power from the pH monitor #2 on the electrical panel to the 3- way air solenoid valve. Rewire if necessary. Caustic in 500 gallon 1. Check the electrical power and poly tank is empty, electrical wiring from the but the alarm fails. electrical panel to the Kari float switch. 2 . If the electrical power and electrical wiring are OK, replace Kari float switch. ACID FEED PROBLEMS Kari float switch in 1. Turn the acid metering pump #1 equalization tank switch on the electrical panel to the energizes one of the "MAN" position to energize the pump. self priming centrifugal 2 . If the acid metering pump #1 is pumps.pH ranges from 11 operating OK,check the electrical to 14 in pH #1 adjust. power from the pH monitor #1 on the tank, but the acid electrical panel to the pump. metering pump is not 3 . If the acid metering pump #1 is not operating. operating OK,check the electrical power from the electrical panel to the pump. 4 . If the electrical power is OK, replace the pump.