SRL Service Manual
Revision 00
July 2007
Page 23 of 56
4.2.1 Inputs
Consists of both analog inputs (J2) and digital inputs (J1 & J3).
Analog Inputs (J2)
J2 1 GND Ground for temperature sensors.
J2 2 B1 Dewpoint Temperature Sensor (B1)
J2 3 B2 Evaporator Temperature Sensor (B2)
J2 4 B3 Compressor Discharge Temperature Sensor (B3)
J2 5 B4 Optional Temperature Sensor
Digital Inputs (J1 & J3)
J1 1 ID5 Low Pressure Switch (LP Alarm)
J1 2 0V Power (Ground)
J1 3 24V Power (24Vac)
J1 5 ID1 High Pressure Switch (HP Alarm)
J1 8 ID2 Compressor Protection (CP Alarm)*
J1 11 ID3 Remote On-Off
J3 1 IDC2 Common (Ground)
J3 2 ID4 Drain Level Sensor**
J3 3 +5V Power Input to Drain Level Sensor**
* SRL-1600 to 6000 (60Hz) and SRL-630 to 1800 (50Hz) only.
** SRL-325 to 6000 (60Hz) and SRL-120 to 1800 (50Hz) only.
4.2.2 Outputs
All outputs are digital.
Digital Outputs (J1 & J3)
J1 4 NO1 Compressor Contactor (KM1) & Liquid Line Solenoid Valve (YV1)
J1 6 C4 Common Alarm
J1 7 NO2 Hot Gas Bypass Solenoid Valve (YV2)
J1 9 NO4 Alarm/Warning (N/O) Contact
J1 10 NO3 Drain Solenoid Valve (YV3)
J1 12 NC4 Alarm/Warning (N/C) Contact
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