Davey Promatic ESC-pH SYSTEM Supplément Au Manuel page 2

Promatic
The ESC-pH system is a combination of a Promatic ESC Salt Water Pool System and
automatic pH Monitor/Controller. Please refer to the ESR/ESC Manual for information on how
to operate the Promatic. This manual covers the pH Control Features of the ESC-pH
system. In the instrument panel the pH Control system controls are located in the dark-
coloured area marked "pH CONTROL". It should be noted that the Promatic operation is
similar to but not exactly the same as the ESC system described in the ESR/ESC manual, for
example a display of the output control setting is not available.
THE DIGITAL DISPLAY
 The digital display is used to provide information on the Promatic output, pH and pH
set point.
 The display will alternately show the chlorinator production and pH
 When the pH Control switch is placed in the SET position the display will show the pH
set point
FEED & pH STATUS LEDs
The pH STATUS LED is used to indicate if the pH is within a range of ±0.3pH of the set point.
If the pH is more than 0.3pH above the set point the LED will flash red/green. If the pH is less
than 0.3pH below the set point the LED will flash red
The FEED STATUS LED is used to indicate the operation of the acid dosing pump:
RED
GREEN
GREEN FLASHING
pH CONTROL
The control switch has three positions:
 RUN
In this position the acid dosing pump will operate according to the value of the
pH set point and measured pH
 SET
This will allow adjustment of the controller set point using adjustment tool. Turn
clockwise to increase the set point. Note that acid pump is off when adjusting set
point
 OFF
Disables the acid dosing pump and control functions
DESCRIPTION OF OPERATION
The pH control has been designed to provide an acid feed in proportion to the difference
between the actual pH and the pH set point. The control also operates on a cycle to allow the
acid being fed to mix with the pool water. The cycle is approximately five minutes duration. If
the pH is 0.3 or more above the set pH at the start of a cycle the acid dosing pump will
operate continuously until the pH falls below the set point plus 0.3pH. When this happens the
amount of time the pump operates each cycle will reduce as the pH gets closer to the set
point. The acid dosing pump will turn off when the set point is reached. The proportional
system is designed to keep pH relatively constant with little or no overshoot (pH falling below
the set point).
Page 2 of 20
ESC-pH
SYSTEM - MANUAL ADDENDUM
ACID PUMP OFF
ACID PUMP AVAILABLE
ACID PUMP IS DOSING
ENGLISH