W6215, W7215, W7460 ECONOMIZER LOGIC MODULES
63-2544—3
4
Outdoor Sensor Input (W7215B and W7460B
only
)
The OSI sensor can be any sensor that provides a 2-10 Vdc
output. Mount the sensor according to the manufacturer
specifications. If not available, use the following guidelines:
1.
Mount sensor in an area with unobstructed air circulation
that is protected from rain, snow, and direct sunlight.
IMPORTANT
Ensure proper polarity of sensor connections.
Incorrect polarity negates the sensor signal.
2.
Connect it to the OA
and OA1 terminals of the W7215B,
or W7460B (see Wiring section for details).
3.
Adjust the OSI potentiometer setpoint to correspond to
OSI sensor voltage output at the threshold.
Fig. 3. Representative locations of connected Economizer system devices.
Wiring
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
IMPORTANT
1. All wiring must comply with applicable local codes,
ordinances and regulations.
2. Refer to Fig. 6 through 25 for typical wiring diagrams.
3. Refer to Table 2 for a list of the wiring diagrams and
corresponding Figure numbers in this document.
4. All device inputs and outputs must be 24 Vac Class 2.
NOTE: All connections with label designation ending in
1
(examples: TR1, T1, P1, Q1, AQ1) are ac/dc
common connections.
Optional Applications
Remote Minimum Position Control
Remote control of outdoor air dampers is desirable when
requiring temporary additional ventilation. One potentiometer
controls the damper minimum position, another potentiometer
controls the damper maximum position. The addition of
S963B1128 Remote Potentiometers allows occupants to open
or close the dampers beyond minimum position for modified
ventilation. Connect the potentiometers as shown in Fig. 4.
IMPORTANT
The minimum position signal takes priority to the
maximum position signal. With the maximum set
below the minimum, the logic module signals the
actuator to maintain the minimum position.
Free Cool Timing
The Free Cool contacts close while the logic module operates
free cooling. Connecting a timer to these contacts allows
tracking of the free cooling usage time.
DISCHARGE
AIR SENSOR
C7046A
DIRECT
EXPANSION
COIL
C7400
ENTHALPY
SENSOR
C7400
ENTHALPY
SENSOR
RETURN AIR
OUTDOOR
AIR
C7150B
MIXED AIR
SENSOR
SPACE
THERMOSTAT
FOR DIFFERENTIAL ENTHALPY, THE TWO C7400
ENTHALPY SENSORS ARE CONNECTED TO THE
W6215/W7215/W7460 ECONOMIZER CONTROL—ONE
IS MOUNTED IN RETURN AIR, AND THE OTHER IS
MOUNTED IN OUTDOOR AIR. DIFFERENTIAL
ENTHALPY CONTROL PROVIDES GREATER
ENERGY SAVINGS THAN SINGLE ENTHALPY.
USE EITHER MIXED AIR SENSOR OR DISCHARGE
AIR SENSOR, NOT BOTH.
M11816
1
1
1
2
2
2
SERIES
62 OR 72
ACTUATOR
W6215,
W7215,
OR
W7460
INDOOR
AIR
SENSOR
OUTDOOR
AIR
SENSOR
EXHAUST AIR
DISCHARGE
AIR
INDOOR
FAN
EXHAUST
FAN