SCS Series Manual — P/N 15712:L 7/18/16 163
HVAC Wiring Diagrams Ratings and Wiring Diagrams
Figure 5.54 Motorized Damper Control - HVAC Switch Group Type 3
Figure 5.54 depicts a motorized damper in an HVAC system with the capability of verification of the
OPEN and CLOSED state, switch group
type 3. In the above configuration, the EMS is supplying power to the damper closed power line. When power is supplied to the damper
closed power line, the damper closes. When the damper completely closes, the damper closed limit switch is
CLOSED, indicating that the
damper is in the CLOSED position. The VER
OFF⁄CL
MM monitors the CLOSED position of the damper closed limit switch and the
VER
ON⁄OP
MM monitors the CLOSED position of the damper open limit switch. In this case the VER
OFF⁄CL
MM is activated and the
VER
ON⁄OP
MM is deactivated because the damper is CLOSED.
Power Source
Damper
Open
Power
ELR-47K
(use 3.9K listed ELR with FZM-1)
N/O
COM
Power Return
FMM-1
DMO-h3a-fs-2.wmf
SLC Loop
VER
OFF/CL
MM
(activated)
Limit Switch
for closed
position
Damper
Closed
Power
AC
MOTOR
DAMPER
CLOSED
Energy
Management
System
FMM-1
VER
ON⁄OP
MM
(deactivated)
N/O
COM
Limit Switch
for open
position
*If the SLC device
does not match the
one in this figure,
refer to the SLC
manual appendix,
which contains
wiring conversion
charts for type V
and type H
modules.