Rola-Chem 554230 ORP Digital Controller - Manual (Page 5)

2.0 Description and Specifications
2.1 General Description
The controller is a microprocessor-based chemical automation system, which
continuously monitors and maintains the ORP level in a swimming pool or spa.
The ORP is displayed using sun-bright light emitting diodes. The ORP level is
continuously monitored and displayed on the controller’s front panel. The ORP
controller has been designed to be user friendly. One MODE button and two SET
buttons allow the operator to easily set parameters.
The ORP display range is 0 to 995 mV with a 5mV resolution. The ORP set point is
adjustable from 400 to 900, with a factory default set point of 650. During a feed
cycle, the feed lamp will blink when chemicals are being feed and illuminate
continuously during the feed delay portion of the feed cycle. The Alert lamp will
flash when the ORP reading is higher or lower than the factory set limits for more
than 10 minutes and prevent the feeding of ORP chemicals.
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 (con). 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.
Overfeed alert occurs after 120 minutes ‘continuous’ feed and 30 cycles in timed feed
mode. Feeders will be disabled and display will flash (requiring reset).
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.
The ORP power output is capable of handling 5 amps at 120 Volt AC. The relay
output is 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.
NOTE: When automating any body of water, it is essential to size the feeders to
reach desired levels in a relatively short period of time. Generally, automating an
existing body of water with existing feeders will require the output of the feeders be
increased accordingly. If feeders are unable to keep up with demand in a short
period of time, automation becomes ineffective.
Rola-Chem Digital Controller PN 554226 6/01/2012 Page: 5 of 12