Nailor 37S Manual page 18

CONTROLLER/ACTUATOR
DAMPER
CW TO
CLOSE
BALANCING
TEES
16 I O
V N U
DC T
24" (610)
LENGTH
1/4" (6) O. D.
TUBING TO
DIAMOND
FLOW
SENSOR
FACTORY
WIRING/PIPING
FIELD WIRING
CONTROL SEQUENCE A1 • COOLING (CONTINUOUS
OPERATION)
Sequence of Operation:
Fan runs continuously, providing constant volume to the space. With room
temperature at set point, unit delivers minimum cooling airflow and maximum
induced plenum air. On a rise in room temperature, the thermostat regulates
the controller/actuator 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 room temperature exceeds the setpoint by 2°F (1.1°C) or more,
primary airflow is maintained at the maximum setting. The maximum setting is
usually the same as the total fan volume setting.
On a decrease in room temperature, the thermostat regulates the
controller/actuator to decrease the airflow and as less cold air is supplied to
the fan section, more warm air is induced from the ceiling plenum. If room
temperature continues to drop, minimum primary airflow is maintained.
Primary airflow is held constant in accordance with thermostat demand. Any
changes in duct air velocity due to static pressure fluctuations are sensed and
compensated for, resulting in pressure independent control.
Minimum and maximum primary airflow limits are adjusted underneath the
thermostat cover.
Note:
Constant volume series terminal fans should be interlocked to be energized
ahead of or when the central system fan starts, 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.
ANALOG ELECTRONIC CONTROL
FAN POWERED TERMINAL UNIT • SERIES FLOW
CONSTANT VOLUME • PRESSURE INDEPENDENT
MODELS: 35S, 35SST, 37S AND 37SST A1
CSP-5002
V
N M M N
O A I
O
– –
R X N
M
24V
M
A
METER
AC
X
%
RED-CLS
M
GRN-OPN
I
N
C
LED
L
CCW CW O
S
E
CTE-5101 ROOM THERMOSTAT (DA)
SINGLE TEMP. SET POINT
12
V1 T3 R1 T1 + V A –
TERMINAL
V1 T1 + –
BLOCK
GROUND
Options:
Thermostat Scale Plate:
(Thermostat includes backing plate for
2" x 4" electrical box).
MINIMUM
COLD
- 2°F
(-1.1°C)
ROOM TEMPERATURE INCREASE
DATE B SERIES
8 - 6 - 08
LINE
VOLTAGE
N H
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
24 VAC
TRANSFORMER
CAPACITOR
FAN
MOTOR
❑ ❑
°F or
TOTAL AIRFLOW MAXIMUM
MIXING
+ 2°F
SETPOINT
(+1.1°C)
SUPERSEDES DRAWING NO.
3500 12 - 2 - 02 35SCD-A1
°C
COOLING
HOT