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“Bleed” menu.
A method for controlling the amount and concentration of make-up water and chemicals introduced into the recirculating
water of a cooling tower system. A oat operated make-up valve controls the addition of make-up water to the tower. As
make-up water is added to the tower a vacuum is produced at an injector valve which draws chemicals from a chemical
holding tank into the make-up water, thereby allowing precise control of the chemical concentration in the make-up liquid.
Further, a bleed valve is provided which is responsive to the vacuum produced at the injector valve and bleeds a portion
of the recirculating water to waste. From “Menu Setup” choose “Bleed” and congure the following parameters:
Setpoint: target value for conductivity.
Dead Band: “MTOWER PLUS” opens bleed valve when reaching setpoint and it leaves valve opens until conductivity value
reaches dead band set value. Choose “-“ before Dead Band value to invert bleed valve working mode.
E.g.: Setpoint is 4000 uS and Dead Band is 500 uS
Time Limit: this option set a time limit within restoring conductivity value. Outreaching this time the “MTOWER PLUS” will
close bleed valve and generate an alarm.
Manual Bleed: this option manually operates bleed valve for set time. Valve operation begins immediately after wheel is
pressed to conrm working time.
To end procedure move cursor on “EXIT” and press wheel to proceed to “Save” request screen. Move wheel on “YES”
to save or “NO” to discard changes.
3500 4000
Bleed ValveOpen
Neutral Zone
Bleed Valve Closed
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