SRL Service Manual
Revision 00
July 2007
Page 37 of 56
9.3 Drain Operating Mode (Parameter D3)
Parameter D3 changes the operating mode of the condensate drain. There are 3 settings available for
this parameter:
Capacitive (Zero Air Loss): The drain solenoid valve (output YV3) is controlled by the
level sensor (input ID4) found inside the integrated or external condensate chamber.
This option is on the SRL-325 to 6000 (60hz) or SRL-120 to 1800 (50Hz) ONLY)
Timed: The drain solenoid valve (output YV3) is controlled by the duration and interval
settings in Parameters D1 & D2.
Continuous (Deactivated): For use when customer prefers to install a separate self
controlled external drain. (Signal to open N03 is always activated - even if the dryer is
off.)
Note: Since the SRL-250 has no level sensor, if the “Capacitive” mode was set on this
model, the microprocessor would get no signal to open, and would keep the valve
closed permanently.
Note that when the drain is set to Continuous (Deactivated) Mode, the drain solenoid
valve must be removed and an external self controlled condensate drain must be
installed. The external drain can be powered through the board output NO3 (24V) or
directly from the electrical cabinet.
9.4 Manual Drain Activation
When set in either Capacitive or Timed mode, the drain valve can be manually activated by
pressing the Drain Button. When the button is pressed the solenoid valve coil is energized
for the duration time set in parameter D1. The manual drain activation is always possible no
matter what the dryer status or signal coming from the level sensor.
If you press the Drain Button while the drain is activated by the controller, it will cause the drain valve
to close.
For further information on the Drain LED and Drain Button, please refer to Sections 4.2.4.1 & 4.2.4.2.
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