WattMaster WCC III part 12 - Manual (Page 25)

12. WCC III INSTALLATION
GUIDE
WCC III Technical Guide 12-23
The “COM” or common connection point can either be connected
to 24 VAC / 24 VDC or GROUND. It is basically a point of view
of turning power “on” to a device, or removing “ground” going
to the device. It makes no difference, as both methods will work
equally well, and really depends on the application you are trying
to control.
1
1
1
1
COM - 24VAC COM - GROUND
H
C
H
C
Figure 12-20: COM connection as 24 VAC or as GROUND
SAT III Relay Outputs