INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-820 / SD-1710
REV 1 – AUGUST 03,.2001
Page 17
SECTION 3
3.2.3 Operating sequence (DDS option) – (Continued)
STEP 4 RIGHT CHAMBER DRYING.
- De-energize solenoid EV-1L
- Energize solenoid EV-1R.
- Inlet valve positioned for right chamber drying.
- When 3 seconds have passed, go to STEP 5
STEP 5 LEFT CHAMBER DEPRESSURIZATION.
- Keep energized EV-1R
If not in DDS mode:
- Energize EV-2L opening right chamber dump/exhaust valve.
If in DDS mode and dewpoint is better than hygrometer setpoint:
- EV-2R does not energize.
When regeneration time has passed, go to STEP 6
STEP 6 LEFT CHAMBER REPRESSURIZATION.
- Keep energized EV-1R.
- De–energize EV-2L closing left chamber dump/exhaust valve.
- The repress timer begins a countdown of 45 seconds (See note 1)
- Inlet valve remains in current position.
NOTE 1: EV-3 and repress valves could be used if dryer operating at pressure
above 125 PSI (G) and / or dryer operating on a timing cycle other than
10 minute cycle. Refer to the specification sheet in this manual or to the
flow schematic supplied with the dryer.
NOTE 2: If power failure occurs to the dryer or unit is turned off, both exhaust valves
will close. The inlet valve will remain in its position.
NOTE 3: The actual timer setting may differ from the previously noted sequence.
Example: A dryer requiring 30 seconds to re-pressurize 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.
NOTE 4: The regeneration and re-pressurization times should be adjusted by
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trained personnel only. Changing the factory settings will result in
loss of dew point and/or failure to re-pressurize before changeover.
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