168
SCS Series Manual —
P/N 15712:L 7/18/16
Ratings and Wiring Diagrams
HVAC Wiring Diagrams
Figure 5.59 Motorized Damper Control - HVAC Switch Group Type 8
Figure 5.59 depicts a motorized damper in an HVAC system with the capability of
OPEN
control, switch group type 8. In the above configu-
ration, the CON
ON⁄OP
CM is activated. The CON
ON⁄OP
CM controls two contactors: a normally 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 nor-
mally 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.
Power Source
Damper
Open
Power
Power Return
Listed
24 VDC
Power Source
D
M
O-
h8
a-
fs-
2
.w
m
f
CON
ON/OP
CM
(activated)
Damper
Closed
Power
AC
MOTOR
DAMPER
OPEN
FCM-1
1a, 1b listed contact
1a listed
contact
Energy
Management
System
SLC Loop
*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.