
30
PLENUM
AIR
SUPPLY
AIR
AIRFLOW
SENSOR
DAMPER
ACTUATOR
SUPPLY
AIR
DAMPER
FAN
FAN
RELAY
OUTPUT
SPACE
TEMPERATURE
SENSOR
CCN BUS
ZONE
CONTROLLER
24 VAC
LEAVING
AIR
100%
MAX COOL LIMIT
(DAMPER OVERRIDE
PRESSURIZATION
MODE)
MAX HEAT LIMIT
MIN HEAT LIMIT
MIN COOL LIMIT
0%
FULL HEATING
FULL COOLING
DEADBAND
COOL
WARM
OCCUPIED
COOLING
NTFC
SETPOINT
OCCUPIED
HEATING &
MORNING
WARM-UP
SETPOINT
DAMPER
OVERRIDE-
EVACUATION
MODE
<
>
% AIRFLOW
SPACE TEMPERATURE (DEGREES)
FAN RUNNING
TO INDUCE
PLENUM HEAT
LEGEND
Fig. 21 — Sequence of Operation for Parallel Fan Powered Air Terminal — Cooling-Only
Air Source Supplying Heated Air
Air Source Supplying Cooled Air
Fig. 20 — Parallel Fan Powered Air Terminal — Cooling-Only
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