SCS Series Manual — P/N 15712:L 7/18/16 165
HVAC Wiring Diagrams Ratings and Wiring Diagrams
Figure 5.56 Motorized Damper Control - HVAC Switch Group Type 5
Figure 5.56 depicts a motorized damper in an HVAC system with the capability of
CLOSED control and verification of the CLOSED state,
switch group type 5. In the above configuration, the CON
OFF⁄CL
CM is deactivated. The CON
OFF⁄CL
CM controls two contactors: a normally
closed contactor for the damper open power line, and a dual normally open/normally closed contactor for the damper close power. When the
CON
OFF⁄CL
CM is activated, the normally closed contactor is opened (cutting any power supplied by the EMS to the damper open power
line), the normally closed portion of the dual contactor is opened (cutting any power supplied by the EMS to the damper closed power line),
and the normally open portion of the dual contactor is closed, thus supplying power to close the damper. When the CON
OFF⁄CL
CM is deacti-
vated, the EMS is free to control the damper. The EMS is currently 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. In this case the VER
OFF⁄CL
MM is activated 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
Listed
24 VDC
Power Source
FMM-1
DMO-h5a-fs-2.wmf
SLC Loop
VER
OFF/CL
MM
(activated)
Limit Switch
for closed
position
Damper
Closed
Power
AC
MOTOR
DAMPER
CLOSED
FCM-1
CON
OFF/CL
CM
(deactivated)
Energy
Management
System
1b listed contact
1a, 1b
listed
contact
*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.
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