Rola-Chem RC554X ORP Digital Controller - Manual (Page 5)

Rola-Chem Digital Controller PN 554237 02/17/2014 Page: 5 of 12
3.0 Description and Specifications
3.1 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.