ROLA-CHEM
®
Digital Controller PN 554135 07/11/19 Page: 20 of 24
8. Appendix
8.1 Dip switch settings
The controller has dip switches to control functions/options that are not accessible on the front panel. These
dip switches are located inside the power panel access cover. Slide switch right for ON or left for OFF. See
section 4.3.
Switch #1 OPR/pH interlock
#1 OFF - ORP chemical feeding is independent of pH feeding and range.
#1 ON factory setting - ORP chemical feeds only when pH is within set limits. ORP chemical will not feed when pH
chemical is feeding.
Switch #2 Consecutive Feed Alert Limit
Setting consecutive feed alert limit to OFF voids NSF certification. If limit is set too high, overfeeding
may occur.
Timed feed Mode
(Feed time set to a value other than “con” or “off” on Controller front panel)
#2 OFF – There is no consecutive feed limit.
#2 ON factory setting – The pH and ORP chemical feeder outputs go through a preset number of consecutive feed
cycles before feeders are disabled. If preset count is reached for either pH or ORP, the respective feeder outputs
will be disabled and its display will flash indicating a Consecutive Feed Alert.
The Consecutive Feed Alert cycle limit can be set from 20 to 100 (default is 40) or ‘off” and can be independently
set for both pH and ORP. The available range and default value on older controllers may vary.
To adjust the Consecutive Feed Alert Limit feature in the 'timed feed mode'
1) Turn off & remove power, then move #2 dip switch to ON.
2) Re-power & press MODE to set it for ORP or pH.
3) Note feed time setting then Set FEED TIME to OFF.
4) Press FEED ONCE button to select the consecutive feed cycle limit.
5) Press FEED TIME to return the feed time to the previous setting.
Continuous feed Mode
(Feed time set to “con” on Controller front panel)
#2 OFF – There is no consecutive feed limit.
#2 ON factory setting - The pH and ORP chemical feeder outputs continuously feed for a preset time before
feeders are disabled. If the preset time period is reached for either pH or ORP, the respective feeder output will be
disabled and its display will flash indicating a Consecutive Feed Alert.
The Consecutive Feed Alert Limit period can be set from 20 to 180 minutes or “off” (default is 40) and can be
independently set for both pH and ORP. The available range and default value on older controllers may vary.
To adjust the Consecutive Feed Alert Limit feature in the 'Continuous feed mode'
1) Turn off & remove power, then move #2 dip switch to ON.
2) Re-power & press MODE to set it for ORP or pH.
3) Set FEED TIME to ‘con’.
4) Press FEED ONCE button to select the continuous feed time limit.
Switch #3 Acid/Base pH chemical feed
#3 OFF factory setting – Unit set to feed acid chemical when pH is over set level.
#3 ON – Unit set to feed base chemical when pH is under set level.
Switch #4 Keypad Lockout
#4 OFF factory setting – Keypad operable to set controller parameters
#4 ON – Keypad operable only for pH calibration. Other parameters stay at settings established prior to moving dip
switch #4 to OFF.
