178 SCS Series Manual — P/N 15712:L 7/18/16
Ratings and Wiring Diagrams HVAC Wiring Diagrams
Figure 5.70 EP Damper Control - HVAC Switch Group Type 4
Figure 5.70 depicts an EP damper in an HVAC system with the capability of
CLOSED control, switch group type 4. In the above configura-
tion, the CON
OFF⁄CL
CM is activated. The CON
OFF⁄CL
CM controls a normally open contactor for the pressure switch power line. When the
CON
OFF⁄CL
CM is activated, the normally open contactor is closed. When the contactor closes, power is supplied to the pressure switch
which cuts the airflow to the damper, closing the damper. When the CON
OFF⁄CL
CM is deactivated, the EMS is free to control the damper.
The EMS is currently being overridden by the CON
OFF⁄CL
CM.
Airflow
PRESSURE
SWITCH
SMOKE
DAMPER
CLOSED
Power Source
Listed
24 VDC
Power Source
SLC Loop
FCM-1
CON
OFF/CL
CM
(activated)
Dep-h4A-fs-2.wmf
Power
Return
Pneumatic
Tubing
Energy
Management
System
1a listed
contactor
*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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