Nailor 37S Manual page 20

CONTROLLER/ACTUATOR
DAMPER
CW TO
CLOSE
BALANCING
TEES
16
V
DC
24" (610)
LENGTH
1/4" (6) O. D.
TUBING TO
DIAMOND
FLOW
SENSOR
FACTORY
WIRING/PIPING
FIELD WIRING
CONTROL SEQUENCE A5
COOLING WITH NIGHT 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. An increase in room temperature reverses the sequence.
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).
Night/Unoccupied Cycle.
Airflow switch de-energizes fan upon loss of primary (central) air.
Upon a call for heat, the thermostat will override the airflow switch and will cycle the
unit fan intermittently to maintain setpoint temperature.
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 A5
CSP-5002
V
N M M
N
O A I
O
I O – –
R X N M
N U 24V
M
A
METER
T 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-5101 ROOM THERMOSTAT (DA)
SINGLE TEMP. SET POINT
12
V1 T3 R1 T1 + V A –
TERMINAL
V1 T3 T1 + –
BLOCK
GROUND
REE-5002
REHEAT RELAY MODULE
OCCUPIED CYCLE (Central System On).
MINIMUM
COLD
- 2°F
(-1.1°C)
UNOCCUPIED CYCLE (Central System Off).
INDUCED PLENUM AIR
COLD
- 2°F
(-1.1°C)
DATE
8 - 6 - 08
LINE
VOLTAGE
N H
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
24 VAC
TRANSFORMER
C
FAN
RELAY
NO
CAPACITOR
FAN
MOTOR
TOTAL AIRFLOW
MIXING
SETPOINT
(+1.1°C)
ROOM TEMPERATURE INCREASE
Night Cycle.
NO
PRIMARY
AIR
SETPOINT
ROOM TEMPERATURE INCREASE
B SERIES SUPERSEDES DRAWING NO.
3500 12 - 2 - 02 35SCD-A5
MAXIMUM
COOLING
HOT
+ 2°F
HOT