Johnson Controls T600MEP-2 Installation Instructions Manual page 3

Terminal
Y1 Energizes on a call for first stage cooling
Y2 Energizes on a call for second stage cooling
G Energizes fan in accordance with the selected fan mode
RC 24 VAC from equipment transformer
C 24 VAC (common) from equipment transformer
RH 24 VAC for heating stages
W1 Energizes on a call for first stage heating
W2 Energizes on a call for second stage heating
AUX Configurable auxiliary output
D1 Configurable digital input
D2 Configurable digital input
RS Remote room sensor
Scom Sensor common
OS Outdoor air sensor
MS Mixed air sensor
EC
0 - 10 VDC Economizer actuator output
Y2 Y1 G RC
Cool 1
Cool 2 Cool 2
Fan
24 VAC
Thermostat Power
Function
RH W1
W2
C
Heat 1 Heat 2
If using the same power source
for the thermostat and heating
loads, install a jumper
across RC and RH.
Figure 5: T600MEP-2 Thermostat Wiring Schematic
T600MEP-2 Programmable Economizer Thermostat Installation Instructions
5 pole left top connector
Y1
Y2
8 pole bottom connector
EC AUX
AUX D2 RS
D1
EC
Aux
Remote
Room
Sensor
3 pole right top
connector
C
G RC
RH W1 W2
D1 D2 RS
MS
OS
Scom
Scom
OS
Remote Remote
Outdoor Mixed Air
Sensor Sensor
3