SCS Series Manual —
P/N 15712:L 7/18/16
169
HVAC Wiring Diagrams
Ratings and Wiring Diagrams
Figure 5.60 Motorized Damper Control - HVAC Switch Group Type 9
Figure 5.60 depicts a motorized damper in an HVAC system with the capability of
OPEN
control and verification of the
CLOSED
state, switch
group type 9. In the above configuration, the CON
ON⁄OP
CM is activated. The CON
ON⁄OP
CM controls two contactors: a normally closed con-
tactor 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 deacti-
vated, 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. In this case the VER
OFF⁄CL
MM is deactivated 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-
h9
a-
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
1b, 1a listed contact
1b listed
contact
Energy
Management
System
*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.