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SCS Series Manual —
P/N 15712:L 7/18/16
171
HVAC Wiring Diagrams
Ratings and Wiring Diagrams
Figure 5.62 Motorized Damper Control - HVAC Switch Group Type 11
Figure 5.62 depicts a motorized damper in an HVAC system with the capability of
OPEN
control and verification of the
OPEN
and
CLOSED
state, switch group type 11. In the above configuration, the CON
ON⁄OP
CM is activated. The CON
ON⁄OP
CM controls two contactors: a nor-
mally closed contactor for the damper closed power line, and a dual normally open/normally closed contactor for the damper open power
line. When the CON
ON⁄OP
CM is activated, the normally closed contactor is opened (cutting any power supplied by the EMS to the damper
closed power line), the normally closed portion of the dual contactor is opened (cutting any power supplied by the EMS to the damper open
power line), and the normally open portion of the dual contactor is closed, thus supplying power to close the damper. When the
CON
ON⁄OP
CM is deactivated, the EMS is free to control the damper. The EMS is currently being overridden by the CON
ON⁄OP
CM.
When power is supplied to the damper open power line, the damper opens. When the damper completely opens, the damper open limit
switch is
CLOSED
, indicating that the damper is in the
OPEN
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 deactivated and the VER
ON⁄OP
MM is activated because the damper is
OPEN
.
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
D
M
O-
h1
1a
-fs
-2
.w
m
f
SLC Loop
CON
ON/OP
CM
(activated)
VER
OFF/CL
MM
(deactivated)
Limit Switch
for closed
position
Damper
Closed
Power
AC
MOTOR
DAMPER
OPEN
FCM-1
1a, 1b listed contact
1b listed
contact
Energy
Management
System
FMM-1
VER
ON⁄OP
MM
(activated)
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.