Nailor 37S Manual page 25

FACTORY
WIRING/PIPING
FIELD WIRING
BALANCING
TEES
24" (610)
LENGTH
1/4" (6) O. D.
TUBING TO
DIAMOND
FLOW
SENSOR
AIRFLOW SWITCH
C NO
NC
DUCT TEMP. SENSOR
CONTROL SEQUENCE B6
COOLING WITH MORNING WARM-UP AND 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. 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.
Morning Warm-up.
A duct mounted temperature sensor is used to measure primary air temperature. Upon
sensing a supply air temperature above 77°F +/-4 (25°C +/-2.2), the primary air damper will
drive fully open regardless of flow limit settings. Central warm air is delivered to the space.
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 B6
CSP-5002
CONTROLLER/ACTUATOR
DAMPER
CW TO
CLOSE
V
N M M
N
O A I
O
16 I O – –
R X N
M
V N U 24V
M
A
METER
DC T AC
X
%
RED-CLS
M
GRN-OPN
I
N
C
LED
L
CCW CW O
S
E
REE-1005 COOLING/HEATING
CHANGEOVER RELAY MODULE
STE-1002
❑ ❑
°F or °C
CTE-5105 ROOM THERMOSTAT (DA/DA) NIGHT/DAY DUAL SET POINT
DPDT
12
V1 T3 R1 T1 + V
RELAY
V1 T3 T1
REE-5002
REHEAT RELAY MODULE
FACTORY
INSTALLED
JUMPER
OCCUPIED CYCLE (Central System On).
COLD
UNOCCUPIED CYCLE (Central System Off).
COLD
DATE
8 - 6 - 08
LINE
VOLTAGE
A – T2 R2 T4 V2
N H
TERMINAL
+ – T4
BLOCK
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
GROUND
SPEED
CONTROLLER
24 VAC
TRANSFORMER
C
NO
CAPACITOR
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
FAN
RELAY
MAXIMUM
COOLING
HOT
+ 2°F
(+1.1°C)
NO
PRIMARY
AIR
HOT
35SCD-B6