Nailor 37S Manual page 22

FACTORY
WIRING/PIPING
FIELD WIRING
DAMPER
CW TO
CLOSE
BALANCING
TEES
24" (610)
LENGTH
1/4" (6) O. D.
TUBING TO
DIAMOND
FLOW
SENSOR
CONTROL SEQUENCE B15
COOLING/HEATING WITH
AUTOMATIC CHANGE-OVER AND NIGHT SHUT DOWN
This arrangement is for use where a single duct central system is used for both cooling and heating
(eg. summer/winter). The heating/cooling thermostat features seperate temperature set points and
seperate min./max. airflow limits. The auto change-over relay/duct temp. sensor energizes either
the cooling or heating mode of the thermostat in response to the duct temperature.
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.
Cooling Mode:
Supply air system in cooling mode (below 77°F (25°C)). 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.
Heating Mode:
Supply air system in heating mode (above 77°F (25°C)). The heating side of the thermostat is
energized and primary air throttling action is reversed. The warm primary airflow modulates between
heating maximum and minimum set points as required by the room thermostat to maintain the
heating set point. The fan terminal delivers a constant volume discharge to the occupied space,
consisting of warm primary air and the balance made up from warm induced ceiling plenum air.
Night/Unoccupied Cycle (Night Shut Down).
Airflow switch de-energizes fan upon loss of primary (central) air.
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: 35S, 35SST, 37S AND 37SST B15
CSP-5002
CONTROLLER/ACTUATOR
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
STE-1002
DUCT TEMP. SENSOR
❑ ❑
°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
REE-1005 COOLING/HEATING
CHANGEOVER RELAY MODULE
COOLING MODE
100
80
60
40
20
0
HEATING MODE
100
MAX.
80
HTG.
60
40
20
0
DATE
8 - 6 - 08
LINE
VOLTAGE
GROUND
N H
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
24 VAC
TRANSFORMER
C
AIRFLOW
SWITCH
NC NO
CAPACITOR
FAN
MOTOR
RESET SPAN
FIXED 2°F
TOTAL AIR
MIN.
– 2°F COOLING
SET POINT
ROOM TEMPERATURE INCREASE
RESET SPAN
FIXED 2°F
TOTAL AIR
MIN.
– 2°F HEATING
SET POINT
ROOM TEMPERATURE INCREASE
B SERIES SUPERSEDES DRAWING NO.
3500 12 - 2 - 02
MAX.
CLG.
+ 2°F
+ 2°F
35SCD-B15