Nailor 37S Manual page 24

CSP-5002
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 B5
COOLING WITH NIGHT TEMPERATURE SET-BACK CYCLE
Sequence of Operation:
Day/Occupied Cycle
The terminal fan is interlocked by way of a positive pressure airflow switch, which
automatically energizes the fan upon sensing central system start up.
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.
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.
Night/Unoccupied Cycle.
Airflow switch de-energizes fan upon loss of primary (central) air and activates the night side
of the thermostat through DPDT relay. Primary air damper cycles closed.
Upon a call for heat, the thermostat will override the airflow switch and will cycle the
unit fan intermittently to maintain night set-back setpoint temperature.
:
Note
Room thermostat has individually adjustable night and day setpoints. They can
be adjusted to be within 1°F (0.55°C) of each other.
Minimum and maximum primary airflow limits are adjusted underneath the thermostat cover.
Options:
Thermostat Scale Plate:
(Thermostat includes backing plate for 2" x 4" electrical box).
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 B5
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
AIRFLOW SWITCH
C NO
NC
❑ ❑
°F or °C
CTE-5105 ROOM THERMOSTAT (DA/DA) NIGHT/DAY DUAL SET POINT
DPDT
V1 T3 R1 T1 +
RELAY
V1 T3 T1
REE-5002
REHEAT RELAY MODULE
OCCUPIED CYCLE (Central System On).
COLD
UNOCCUPIED CYCLE (Central System Off).
COLD
DATE
8 - 6 - 08
LINE
12
VOLTAGE
V A – T2 R2 T4 V2
N
TERMINAL
+ – T4
BLOCK
GROUND
24 VAC
TRANSFORMER
FAN
MOTOR
TOTAL AIRFLOW
MIXING
MINIMUM
- 2°F
DAY
(-1.1°C)
SETPOINT
ROOM TEMPERATURE INCREASE
Night Cycle.
INDUCED PLENUM AIR
- 2°F
NIGHT
(-1.1°C)
SETPOINT
ROOM TEMPERATURE INCREASE
B SERIES SUPERSEDES DRAWING NO.
3500 12 - 2 - 02
H
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
C
FAN
RELAY
NO
CAPACITOR
MAXIMUM
COOLING
HOT
+ 2°F
(+1.1°C)
NO
PRIMARY
AIR
HOT
35SCD-B5