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Automatic Purge Filtration
The Automatic Purge Filtration feature may be invoked if the soil sensor detects excessive soils. This
can occur during selected wash or rinse functions. APF mode provides one or more purges of excess
soils trapped in the soil accumulator at specified intervals in a cycle.
1. The APF mode operates for a total of 10 seconds while the wash pump continues to wash.
The accumulator screen will be cleaned from jets on the underside of the lower spray arm. (1)
2. During the first five seconds, the drain pump (2) turns on and the fill valve is activated. This
purges the soiled water from the accumulator and begins to add fresh water.
APF Function
First Five Seconds
1
3b
3a
APF Function
Last Five Seconds
3. For the remaining five seconds, the drain pump is turned off, (3a) but the fill valve remains
activated to bring wash water back to the proper level. (3b)
NOTE 2 – APF ENABLED INTERVALS
The APF (
Automatic Purge Filtration) wash system allows the control to continuously filter and flush
food soil out of the pump during “APF enabled” intervals scattered throughout each cycle and do it
without interrupting the cycle. The control monitors the pressure switch (soil sensor) input during each
of the APF enabled intervals in the cycle (see time chart). Whenever a pressure switch trip is detected
in one of these APF intervals, the control executes a 10-second “APF purge” to clear the pump of
soils. These APF purges occur in parallel with the cycle and do not interrupt or affect the timing of
other functions (like washing) in the interval. Each APF purge consists of 5 seconds of Fill and Drain
followed immediately by 5 seconds of Fill by itself. If an APF purge is executed during a heated wash
interval, the heater must be turned off during the first 5-second Fill and Drain portion of each purge,
but cycle timing is not affected and the heater turns back on midway through the purge.
Multiple APF purges can occur within each APF interval of the cycle but are limited by certain fre-
quency and quantity limits:
• APF purges must be spaced at least 60 seconds apart within any given APF interval (the
pressure switch will be ignored prior to 60 seconds).
• The maximum number of APF purges allowed within a given APF interval is specified on the
time chart in that interval (the pressure switch will be ignored for the duration of an APF
interval once the maximum APF limit for that interval has been exceeded). In interval 33, the
limit is “1” for 120F thermal holds and “3” for all other thermal hold setpoint temperatures.
Note: Models without pressure switches (soil sensors) never get sensor trips and thus never execute
APF purges. (See Model Specifics Table to identify models without pressure switches).
NOTE 3 – WATER HEATING THERMAL HOLD INTERVALS
During water heating thermal holds (intervals 40, 33, & 15), cycle timing is interrupted and the dish-
washer continues washing while it heats the water to the setpoint temperatures specified on the time
chart for each version of the cycle. The Water Heating and Sensing indicators are turned on and the
cycle time displayed by models with numeric displays is frozen during thermal hold intervals (see
notes 5, 6, & 7). The dishwasher will hold in this suspended, water heating mode until the water
reaches the temperature specified for the thermal hold or a maximum default time limit for the thermal
hold (below) expires. At the conclusion of the thermal hold, the control resumes normal operation and
timing and proceeds to the next interval.
The default maximum time limits for all the thermal hold intervals are as follows (in minutes):
Pre-Wash Main Wash Final Rinse (Final Rinse with Sani Rinse)
Anti-bacteria/Cookware 30 35 50 (50)
Pots & Pans/Heavy 30 35 30 (50)
Normal — 45 40 (60)
China — 45 30 ( — )
(Quick Clean Up/Time Saver and Quick Rinse/Rinse Only cycles have no thermal hold intervals)
NOTE 4 – THERMALLY CAPPED INTERVALS
Interval 34 is a heated wash interval thermally capped at 150F/66C. Interval 10 is only heated for the
Quick Clean Up/Time Saver cycle and is thermally capped in that situation at 150F/66C. Anytime the
thermal cap temperature is exceeded during one of these intervals, the heater will turn off, but the
dishwasher will continue washing for the duration of the interval.