Section 2 – SR-2 Hardware Description
Interface Board LED Functions
The LED is illuminated when the associated circuit is
energized.
LED # Function
LED3 K2 Preheat Circuit
LED4 K4 Damper Circuit
LED5 K3 High Speed Circuit
LED6 K1 Run Relay Circuit
LED7 K5 Diesel/Electric Relay
LED 8 Pilot Solenoid Circuit
LED 9 Liquid Line Solenoid Circuit
LED10 Hot Gas Bypass Valve Circuit
LED11 Spare Output 1 Circuit
LED17 Loader Valve 1
LED18 Loader Valve 2
LED19 Liquid Injection Valve Circuit
LED20 Water Valve
LED21 Status – Flashes once per second
when the microprocessor is powered
and operating normally. Flashes
several time per second when flash
loading. Is on without flashing during
reboot and when under test.
LED22 K8 Electric Circuit
LED23 K9 On/Off Circuit
LED24 K6 Fuel Solenoid Pull-In Circuit
LED25 K7 Starter Circuit
LED26 Future Use
Smart FET Outputs
A Smart FET is a self protecting output device used
for the functions shown in the table below. If an
overcurrent condition occurs, the Smart FET will turn
off until the overcurrent condition no longer exists. It
will then resume normal operation. A fuse is not
required.
Output Function
Run Relay Coil
High Speed Relay Coil
EVA, EVB, EVC, EVD ETV Outputs
26 Pilot Solenoid
HG Hot Gas Solenoid
ALPC Alarm Light
ALM Alarm Light
LV1 Loader Valve 1
LV2 Loader Valve 2
WV Water Valve
LQI Liquid Injection Valve
LLS Liquid Line Solenoid
GM1, GM2 Damper Gear Motor
1
Note 1 - Gear motor circuitry not present on all relay
boards.
2-13
31 January 2005
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