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4.2 Cooling Tower Start-up
The DC4500 can be programmed for a multitude of tasks for cooling tower applications. Prior to powering
up the DC4500 Conductivity Controller it is recommended that the following PRE-START UP work sheet be
completed to determine required system operating parameters.
1.
Current System Conductivity ________________________________________________
2.
Desired Conductivity Set Point _________________________________________________
3.
Differential (Hysterisis) Range _________________________________________________
4.
Method of Chemical Inhibitor Feed (choose one of the following) _____________________
(1) PULSE TIMER (Flowmeter based input response).
(2) % of TIME (Continuous repeating cycle with pump ON time based on percent of the cycle time.
(3) % of BLEED or BLOWDOWN (Amount of feed is based on a percent of the total bleed/
blowdown time).
(4) LIMIT (Chemical inhibitor feed at the same time as system bleed or blowdown).
The Feed pump can be controlled by either a powered relay output or by direct variable speed control. The
direct power or On/Off mode requires the pump to be connected to the ‘FEED L’ and any ‘AC NEUT’
terminal connection on the pc board. If an LMI ‘7’ or ‘9’ series pump is being used the pump stroking speed
may be directly controlled by the DC4500 pulsed output. The pump 4 pin connector must be wired to the
‘PLS1 +’ and ‘PLS1 -’ terminals on the pc board.
On/Off Pump Control _____________________________________________________
Variable Speed Pump Control _____________________________________________
5.
High Alarm Setting __________________________________________________________
6.
Low Alarm Setting ___________________________________________________________
7.
Flow Switch Alarm activation (Yes/No) ________________________________________
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