Rola-Chem RC554XXP Dual ORP/pH Digital Controller - Manual (Page 5)

Rola-Chem Digital Controller PN 554326 02/17/2014 Page: 5 of 20
3.0 Description and Specifications
3.1 General Description
The controller is a microprocessor-based chemical automation system, which continuously
monitors and maintains the pH balance and sanitizer level in a swimming pool or spa.
The pH and sanitizer level (ORP) are displayed using sun-bright seven-segment light emitting
diodes. The pH and ORP levels are continuously monitored and displayed on the controller’s
front panel. The ORP/pH controller has been designed to be user friendly. One MODE button
and six SET buttons allow the operator to easily set parameters.
The pH display range is 6.8 to 8.2 with a .1 unit resolution. The pH set point is adjustable
from 7.0 to 8.0 in .1 pH steps, with a factory default set point of 7.4 pH. During a pH feed
cycle, the pH feed lamp will blink when pH chemicals are being feed and illuminate
continuously during the feed delay portion of the feed cycle. The pH Alert lamp will illuminate
when the pH reading is higher or lower than the high and low pH Alert set points and prevent
the feeding of pH chemicals.
The sanitizer (ORP) display range is 0 to 995 mV with a 5 mV display resolution. The ORP1
set point is adjustable from 400 to 900 mV, with default set point of 650 mV. The ORP2 set
point is adjustable from 400 to 890 mV, with default set point of 640 mV. The ORP2 will be
10mV or more below the ORP1.
During an ORP feed cycle, the ORP1or ORP2 feed lamp will blink when sanitizer chemicals
are being feed and illuminate continuously during the feed delay portion of the feed cycle.
The ORP Alert lamp will illuminate when the ORP reading is higher or lower than the high and
low ORP Alert set points and prevent the feeding of sanitizer chemicals.
A manual feed cycle for pH or ORP can be started by pressing the Mode button (placing the
controller in stand-by mode for either pH, ORP1 or ORP2) and then pressing the Feed Once
button.
The feed cycle is a timed based ‘feed then delay’ system. The controller has a series of fixed
feed times (0.6 to 900 sec.) with associated delays as well as a constant feed mode. A feed
cycle consists of a feed time plus a delay time. Example, a 30 second feed time followed by
a five-minute delay would have a 5½ minute feed cycle. The chemical feeder dispenses
chemical only during the feed time portion of the cycle and then waits for a delay period to
allow for chemical to dispense throughout the swimming pool or spa.
The controller incorporates an internal non-volatile memory in which all factory default
settings as well as field-modified settings are stored. The internal memory is not affected by
power interruption and requires no backup battery. Acid/base, pH/ORP interlock, function
control and lockout switches are located behind the terminal block access panel.
The pH and ORP outputs are capable of handling 3.15 amps each at 120 Volt AC. The relay
outputs are fused and transient protected. An internal terminal strip is provided for field wiring
of the controller. The internal step-down transformer has a class-two energy limiting rating to
provide for electrical safety.