USER MANUAL
Models SD-820 to SD-1710 with DDS
Rev 04 – October 2005
APPENDIX A
OPERATING SEQUENCE
A-2
TABLE A-1 DRYER STEP SEQUENCE (CONT’D)
STEP
FUNCTION
PROCESS
5
DEPRESSURIZE
LEFT CHAMBER
Keep EV-1R energized.
If in DRYER ON mode:
Energize
EV-2L
opening
left
chamber
dump/exhaust valve.
If in DDS ON mode and dew point is better than
hygrometer set point:
EV-2L does not energize.
When regeneration time has passed, go next step.
6
REPRESSURIZE
LEFT CHAMBER
Keep EV-1R energized.
De-energize EV-2L: close left chamber dump/exhaust
valve.
The repressurization timer begins a countdown of 40
seconds.
Inlet valve remains in current position.
NOTE: The actual timer setting may differ from the previously noted sequence.
Example: A dryer requiring 30 seconds to repressurize the regenerating
chamber will have a regeneration time of 4 minutes and 30 seconds. The
half-cycle time will remain at 5 minutes and full cycle at 10 minutes.
The regeneration and repressurization times shall be adjusted by Sullair
trained personnel only. Changing the factory settings will result in loss
of dew point and/or failure to repressurize before changeover.
Summary of Contents for SD-1050 Series
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