Nailor 37S Manual page 32

CSP-5002
CONTROLLER/ACTUATOR
DAMPER
CW TO
CLOSE
BALANCING
TEES
16 I O – –
V N U 24V
DC T AC
24" (610)
LENGTH
1/4" (6) O. D.
TUBING TO
DIAMOND
FLOW
SENSOR
FACTORY
WIRING/PIPING
FIELD WIRING
CONTROL SEQUENCE A4
COOLING WITH PROPORTIONAL ELECTRIC HEAT
(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. When room temperature falls below heating setpoint, a 0 - 10 VDC
proportional thermostat output signal begins to energize the SCR controlled electric heat.
The electric heat is fully on at 2°F (1.1°C) below heating setpoint. 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.
Notes:
1. Cooling and heating setpoints can be adjusted to be within 1°F (0.55°C) from each other.
(Minimum and maximum primary airflow limits are adjusted underneath the thermostat cover).
2. 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.
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: 35SE, 35SEST, 37SE AND 37SEST A4
V
N M M N
O A I O
R X N
M
M
A
METER
X
%
RED-CLS
M
GRN-OPN
I
N
C
LED
L
CCW CW O
S
E
❑ ❑
°F or °C
CTE-5103 ROOM THERMOSTAT (DA/RA)
DUAL TEMP. SET POINT
12
V1 T3 R1 T1 + V A – T2 R2 T4 V2
TERMINAL
V1 T1 + – T2
BLOCK
0 – 10 VDC
SIGNAL TO
SCR
SCR PROPORTIONAL
ELECTRIC HEAT
DATE
2 - 7 - 11
GROUND
24 VAC
TRANSFORMER
MOTOR
TOTAL AIRFLOW
MIXING
MINIMUM
COLD
- 2F
HEATING COOLING
(-1.1C)
SETPOINT SETPOINT
ROOM TEMPERATURE INCREASE
B SERIES SUPERSEDES DRAWING NO.
3500 NEW
LINE
VOLTAGE
N H
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
CAPACITOR
FAN
MAXIMUM
COOLING
HOT
+ 2F
(+1.1C)
35SECD-A4