SRL Service Manual
Revision 00
July 2007
Page 35 of 56
9. Condensate Drain Operation
9.1 SRL-250
The SRL-250 has a solenoid valve (coil YV3) that is controlled as a timed drain by the microprocessor
on the dryer. The user can adjust the operation of the drain by changing User Parameters D1
(Duration) and D2 (Interval) on the dryers control panel. See Section 7.3 for further information on
accessing and adjusting User Parameters.
9.2 SRL-325 to 6000
On dryers SRL-325 through 6000 the solenoid valve can be also
controlled as a zero air loss drain by the microprocessor. Factory
Parameters D4 through D8 control the operation to ensure zero air loss
operation. These parameters are locked and cannot be viewed or
adjusted.
Condensate collects in the Condensate Chamber (3.1.4). The Level Sensor (3.1.6) continuously
monitors the level of condensate, closing the contacts and sending a signal to the microprocessor
(digital input ID4) when it senses liquid.
The microprocessor opens the solenoid drain valve (coil YV3) when it gets a signal from the Level
Sensor continuously for 30 seconds (Parameter D4 – Drain Open Delay).
The condensate is then discharged from the Condensate Chamber through the solenoid drain valve
under pressure.
The microprocessor closes the solenoid drain valve when it stops getting a signal from the level
Sensor continuously for 5 seconds (Parameter D5 – Drain Close Delay).
(Continued on following page…)
Parameters Units Min Max Default
D4 Drain Open Delay* sec 0 900 60
D5 Drain Close Delay (Normal Cycle)* sec 0 120 5
D6 Drain Close Delay (Extended Cycle)* sec 0 300 10
D7 Extended Cycle Interval* - 0 900 100
D8 Drain Alarm Setting* sec 10 900 30
Parameters Units Min Max Default
D1 Drain Duration (Time open) sec 1 60 5
D2 Drain Interval (Time closed) sec 1 900 120
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