SRL Service Manual
Revision 00
July 2007
Page 38 of 56
10. Alarms & Warnings
10.1 Alarm & Warning List
Code # Description Type Delay Action
HP
1 High Pressure Alarm None Stops Dryer.
LP
2 Low Pressure Alarm 2 min Stops Dryer.
Ld
4 Low Dewpoint (B1) Alarm 3 min Stops Dryer.
Ht
9 High Discharge Temperature (B3) Alarm None Stops Dryer.
Lt
10 Low Evaporation Temperature (B2) Alarm 1 min Stops Dryer.
CP
11 Compressor Protection Alarm None Stops Dryer.
PdE
12 Parameter Data Error Alarm None Stops Dryer.
Hd
3 High Dewpoint Temperature (B1) Warning Note 1 Trips common alarm.
drE
5 Drain Error Warning None Changes to Timed Mode
dSE
7 Dewpoint Sensor Error (B1) Warning None Trips common alarm.
rSE
8 Evaporator Temp Sensor Error (B2) Warning None Trips common alarm.
Sr
6 Service Required Warning None Trips common alarm.
The control board is provided with an alarm relay with NO/NC contacts. The relay is normally
energized once the controller is powered in order to provide an alarm indication when a fault happens
or when power is disconnected.
When the controller gets a signal to indicate an alarm or warning, it cuts power to the alarm relays,
turns on the “Warning” light, and displaying the alarm code on the digital display. Each alarm/warning
is identified with a number which is used to pass the information through the serial port.
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