Rola-Chem Digital Controller PN 554326 02/17/2014 Page: 16 of 20
8.0 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 access panel. See section 3.3. The default for switches #1 and #2
is the ON position. The default for switches #3 and #4 is the OFF position. NSF certification of this
automated controller requires the feed mode limit (switch #2) to remain in the ON position.
Control Switch Description
ORP/pH interlock
#1 OFF ORP chemical feeding is independent of pH feeding and range.
#1 ON ORP chemical feed only when pH is within limits.
ORP will not feed when pH chemical is feeding.
Feed mode limit -Timed feed Mode (Time set on front panel)
#2 OFF There is no consecutive feed limit.
#2 ON The pH & 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.
The number of consecutive feed cycles is 20 to 100 (default is 20)
and can be independently set for both pH and ORP.
Setting consecutive feed cycle limit to OFF voids NSF certification.
To adjust the time out 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) Set FEED TIME to OFF
4) Press FEED ONCE to select the feed count
5) Press FEEDTIME and return the time to the desired cycle
Feed mode limit -Continuous feed Mode (Time set to 'con' on front panel)
#2 OFF There is no consecutive feed limit.
#2 ON The pH & 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.
The time out period can be set from 20 to 180 minutes (default is 20)
and can be independently set for both pH and ORP.
Setting consecutive feed time limit to OFF voids NSF certification.
To adjust the time out 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 default feed time
Acid/Base pH chemical feed
#3 OFF Unit set to feed acid chemical when pH is over set-point
#3 ON Unit set to feed base chemical when pH is under set-point
Keypad Lockout
#4 OFF Key pad operable to set controller parameters
#4 ON Key pad operable only for pH calibration. Other parameters stay at
settings established prior to moving dip switch #4
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