Nailor 35SW Manual page 33

Nailor
Industries Inc.
DIAMOND
FLOW
SENSOR
AIRFLOW
BALANCING
TEES
SETTING
MUST BE
N. C.
M
MAIN AIR
20 PSI
CONTROL SEQUENCE 3P3 • VAV COOLING WITH ELECTRIC
HEAT (CONTINUOUS OPERATION) • DA/NC • 3000 CONTROLLER
Sequence of Operation:
The unit fan will deliver a constant volume to the space at all times. With space
temperature at set point, unit delivers minimum cooling airflow and maximum
induced plenum air.
On a rise in space temperature, the thermostat regulates the controller to
increase primary airflow. As more cold air is supplied to the fan section, less
warm air is induced from the ceiling plenum.
When the space temperature is warm, the primary air damper is controlling at
the maximum airflow setting (usually the same as the fan volume setting and
no plenum air is induced).
As the space temperature decreases, the damper modulates back towards
the minimum airflow setting and as less cold air is supplied to the fan section,
more warm air is induced. If room temperature continues to drop, minimum
primary airflow is maintained and staged electric heat is energized.
Primary airflow is held constant in accordance with thermostat demand. Any
changes in volume due to static pressure fluctuations are sensed and
compensated for, resulting in pressure independent control.
Note:
Constant volume series terminal fans should be electrically or pneumatically
field interlocked with the central fan system, to prevent backflow of primary
air into the ceiling plenum and to prevent possible backward rotation of the
terminal fan.
SCHEDULE TYPE:
PROJECT:
ENGINEER:
CONTRACTOR:
Nailor Industries Inc. reserves the right to change any information concerning product or pricing without notice.
PNEUMATIC CONTROL
FAN POWERED TERMINAL UNIT • SERIES FLOW
CONSTANT VOLUME • PRESSURE INDEPENDENT
MODELS: 35SE, 35SEST, 37SE AND 37SEST 3P3
NORMALLY CLOSED
DAMPER
MCP-8030
HI LO
ACTUATOR
(8 – 10 PSI)
RESET START POINT
FACTORY SET
@ 8 PSI
T
H
B L
NC
KREUTER
M
DAMPER
RESET SPAN
G
FACTORY SET
CSC-3011
@ 5 PSI
RESET CONTROLLER
FACTORY WIRING/ PIPING
FIELD PIPING
ELECTRIC
STAGE 3
P. E.
(OPTIONAL) SWITCH
STAGE 2
P. E.
SWITCH
(OPTIONAL)
NORMALLY
P. E.
STAGE 1
SWITCH
P. E. SWITCH
M B
DIRECT ACTING
2-PIPE THERMOSTAT
(OPTIONAL OR BY OTHERS)
DATE
12 - 2 - 02
LINE
HEAT VOLTAGE
COIL
N H
TOGGLE
CLOSED
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
CAPACITOR
FAN
MOTOR
Options:
Two Pipe Thermostat (Vertical Mount.
Includes backing plate for 2" x 4" electrical box).
❑
CTC-1621-103 °F scale plate
❑
CTC-1621-113 °C scale plate
100
TOTAL AIRFLOW
80
60
STAGE
3
STAGE
40
2
STAGE
MIN.
1
20
0
0 3 8
THERMOSTAT OUTPUT PRESSURE, PSI
SPACE TEMPERATURE INCREASE
B SERIES SUPERSEDES DRAWING NO.
3500 9 - 12 - 99RR 35SECD-3P3
MAX.
CLG.
13 15