Imperial SHMTM - Manual (Page 14)

PAGE 14
16. Wiring Diagram
(Model SHM TM Only)
Note
to installer
On older thermostats, energizing the R
and G terminals at the forced air system
has the effect of energizing the Y termi-
nal at the thermostat and therby activat-
ing the coolong system. If you identify
this type of thermostat, you must use
Option 3.
OPTION 3
OPTION 1
OPTION 2