Trane ReliaTel Diagnostic Manual page 15

Figure 5. Honeywell Economizer Module (ECA)
Refrigeration
Module
24 VAC
RT-SVD03G-EN
Honeywell Economizer Module
Power Exhaust
ModBus Communication
B C
D
A
E
C0
(500-1500 ppm)
MA Sensor
Mixed Air Temp (AIP)
10K 25C Neg Coeff
RH Sensor
Return Air Relative Humidity (AIP)
4-20 mA Pos Coeff
RA Sensor
Return Air Temp (AIP)
10K 25C Neg Coeff
RH Sensor
Outdoor Air Relative Humidity (AIP)
4-20 mA Pos Coeff
C0 2 Sensor
IAQ Sensor (C0 2 ) (AIP)
0-10 VDC
Potentiometer
Remote Minimum Position Pot. (AIP)
0-270 Ohm
Status LED
Enthalpy/Temperature
Setpoint Pot.
0-50% Minimum
Position Pot.
Setpoint Adjustment
2
Module Flow Diagram
PWR
EXH
relay
24 VAC
ECA
15