SRC Service Manual
Revision 02
Aug 2007
Every 100 cycles (Parameter D7 – Extended Cycle Interval), the microprocessor goes through an
extended cycle, keeping the drain open for 10 seconds (Parameter D6 –Drain Close Delay [Extended
Cycle]) after the level Sensor stops sending a signal. This allows the drain to periodically clean itself.
If the drain has been open for 30 seconds and the Level Sensor still senses liquid (Parameter D8 –
Drain Alarm Setting), the dryer goes into alarm. “drE” flashes on the display, and the microprocessor
automatically changes to timed operation in accordance with the interval and duration settings in User
Parameters D1 & D2. When the Level Sensor stops sensing liquid, the microprocessor will
automatically change back to zero air loss operation.
If desired the user can force the drain on the SRC-400 through 1000 to always operate in timed mode
or they can deactivate drain control completely*. This is achieved by adjusting Parameter D3 – Drain
Operating Mode. See Section 8.4 for details on this parameter.
* In this case, the solenoid valve must be removed and a separate self controlling condensate drain installed.
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