Rola-Chem 554200 pH 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 pH balance in a swimming pool or spa.
The pH is displayed using sun-bright light emitting diodes. The pH level is continuously
monitored and displayed on the controller’s front panel. The controller has been
designed to be user friendly. One MODE button and three 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, with a factory default set point of 7.4 . 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 pH
reading is higher or lower than the factory set limits for more than 10 minutes and
prevent the feeding of pH 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 pH 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 554212 6/01/2012 Page: 5 of 12