Reversomatic Economy Series - Manual (Page 8)

Low Voltage
+5
DA
T C
Speed Contact
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC C N0
Ext. Interlock
HIGH VOLTAGE
Low Voltage
+5
DA
T C
Speed Contact
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC C N0
Ext. Interlock
HIGH VOLTAGE
On some older thermostats, energizing the R and G terminals at the furnace has the effect of energizing Y at the
thermostat and thereby turning on the cooling system. If you identify this type of thermostat, you must use the
“Alternate Interlock Wiring”.
For a furnace connected to a cooling system:
Wiring Diagram (cont’d)
6
Furnace / Fan-Coil / Heat Pump Interlock:
Standard Interlock Wiring
W R G Y
W
R
G
Y
C
FOUR WIRE TWO WIRE
heating only
Cooling
System
THERMOSTAT TERMINALS
TWO WIRE