SCS Series Manual — P/N 15712:L 7/18/16 177
HVAC Wiring Diagrams Ratings and Wiring Diagrams
Figure 5.68 depicts an EP damper in an HVAC system with the capability of verifying the OPEN state, switch group type 2. In the above con-
figuration, the EMS is supplying power to the pressure switch. When power is supplied, the pressure switch cuts the airflow to the damper,
closing the damper. When the damper completely closes, the damper closed limit switch is CLOSED, indicating that the damper is in the
CLOSED position. The VER
ON⁄OP
MM monitors the CLOSED position of the damper open limit switch. In this case the VER
ON⁄OP
MM is deac-
tivated because the damper is CLOSED.
Figure 5.69 EP Damper Monitor - HVAC Switch Group Type 3
Figure 5.69 depicts an EP damper in an HVAC system with the capability of verifying the
OPEN and CLOSED state, switch group type 3. In the
above configuration, the EMS is supplying power to the pressure switch. When power is supplied, the pressure switch cuts the airflow to the
damper, closing the damper. When the damper completely closes, the damper closed limit switch is CLOSED and the damper open limit
switch is
OPEN, indicating that the damper is in the CLOSED 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 acti-
vated and the VER
ON⁄OP
MM is deactivated because the damper is CLOSED.
FMM-1
Airflow
PRESSURE
SWITCH
SMOKE
DAMPER
CLOSED
Power Source
SLC Loop
Dep-h3A-fs-2.wmf
Power
Return
VER
OFF⁄CL
MM
(activated)
N/O
COM
Limit Switch
for closed
position
ELR-47K
(use 3.9K listed ELR with FZM-1)
Pneumatic
Tubing
Energy
Management
System
N/O
COM
Limit Switch
for open
position
VER
ON⁄OP
MM
(deactivated)
FMM-1
*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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