
31
PLENUM
AIR
SUPPLY
AIR
AIRFLOW
SENSOR
DAMPER
ACTUATOR
SUPPLY
AIR
DAMPER
FAN
STAGES
RELAY
FAN
RELAY
OUTPUT
SPACE
TEMPERATURE
SENSOR
CCN BUS
ZONE
CONTROLLER
24 VAC
1
2
3
ELEC HEAT
LEAVING
AIR
LEAVING AIR
TEMPERATURE
SENSOR
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
3
2
1
ELECTRIC
HEAT
STAGES
PLENUM
AIR
SUPPLY
AIR
AIRFLOW
SENSOR
DAMPER
ACTUATOR
SUPPLY
AIR
DAMPER
FAN
FAN
RELAY
OUTPUT
SPACE
TEMPERATURE
SENSOR
CCN BUS
ZONE
CONTROLLER
24 VAC
HEAT COIL
LEAVING
AIR
LEAVING AIR
TEMPERATURE
SENSOR
HEAT
VALVE
Fig. 22 — Parallel Fan Powered Air Terminal with Staged Electric Heat
LEGEND
Fig. 23 — Sequence of Operation for Parallel Fan Powered Air Terminal with Staged Electric Heat
Air Source Supplying Heated Air
Air Source Supplying Cooled Air
Fig. 24 — Parallel Fan Powered Air Terminal with Hot Water or Steam Heat
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