Nailor 35SW Manual page 32

DIAMOND
FLOW
SENSOR
AIRFLOW
BALANCING
TEES
LOW STAT P = MAX.
HIGH STAT P = MIN.
SETTING
MUST BE
N. O.
M
MAIN AIR
20 PSI
CONTROL SEQUENCE 2P3 • VAV COOLING WITH ELECTRIC HEAT
(CONTINUOUS OPERATION) • REVERSE ACTING/NORMALLY OPEN
• 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 2P3
NORMALLY OPEN
DAMPER
MCP-8030
HI LO
ACTUATOR
(8 – 10 PSI)
RESET START POINT
FACTORY SET
@ 3 PSI
T
H
B L
NO
KREUTER
M
DAMPER
RESET SPAN
G
FACTORY SET
CSC-3011
@ 5 PSI
RESET CONTROLLER
FACTORY WIRING/ PIPING
(OPTIONAL OR BY OTHERS)
FIELD PIPING
ELECTRIC
STAGE 3
P. E.
(OPTIONAL) SWITCH
STAGE 2
P. E.
SWITCH
(OPTIONAL)
P. E.
STAGE 1
SWITCH
P. E. SWITCH(ES)
M B
REVERSE ACTING
2-PIPE THERMOSTAT
Options:
Two Pipe Thermostat (Vertical Mount.
Includes backing plate for 2" x 4" electrical box).
❑
❑
100
DATE
10 - 17 - 07
LINE
HEAT VOLTAGE
COIL
N H
NORMALLY
TOGGLE
OPEN
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
CAPACITOR
FAN
MOTOR
CTC-1622-103 °F scale plate
CTC-1622-113 °C scale plate
TOTAL AIRFLOW
MAX.
80
CLG.
60
40
STAGE
1
20
0
0 3 8
THERMOSTAT OUTPUT PRESSURE, PSI
SPACE TEMPERATURE DECREASE
B SERIES SUPERSEDES DRAWING NO.
3500 NEW
STAGE
3
STAGE
2
MIN.
13 15
35SECD-2P3