Nailor 37S Manual page 42

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 A8
COOLING WITH PROPORTIONAL HOT WATER HEAT AND
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. When room temperature falls below heating setpoint, a 0 - 10 VDC
proportional hot water valve begins to open. The water valve is fully open 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.
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 an cycle the unit fan followed by the
supplementary heat intermittently to maintain set point temperature.
Note: 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).
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: 35SW, 35SWST, 37SW AND 37SWST A8
TERMINAL
BLOCK
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-5103 ROOM THERMOSTAT (DA/RA)
DUAL TEMP. SET POINT
12
V1 T3 R1 T1 + V A – T2 R2 T4 V2
V1 T3 T1 + – T2
TERMINAL BLOCK
0 – 10 VDC SIGNAL
TO PROPORTIONAL
HOT WATER VALVE
CLOSED AT 0 VDC
OPEN AT 10 VDC
REE-5002
(BY OTHERS)
REHEAT RELAY MODULE
10 mA MAX.
OCCUPIED CYCLE (Central System On).
COLD
UNOCCUPIED CYCLE (Central System Off).
COLD
DATE
8 - 6 - 08
LINE
VOLTAGE
N H
GROUND
+ –
24 VAC
TRANSFORMER
FAN
MOTOR
TOTAL AIRFLOW
MIXING
MINIMUM
- 2°F
HEATING COOLING
(-1.1°C)
SETPOINT SETPOINT
ROOM TEMPERATURE INCREASE
Night Cycle.
INDUCED PLENUM AIR
PRIMARY
- 2°F
HEATING COOLING
(-1.1°C)
SETPOINT SETPOINT
ROOM TEMPERATURE INCREASE
B SERIES SUPERSEDES DRAWING NO.
3500 12 - 2 - 02
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
C
FAN
RELAY
NO
CAPACITOR
MAXIMUM
COOLING
HOT
+ 2°F
(+1.1°C)
NO
AIR
HOT
35SWCD-A8