Honeywell Ventilation Hood W7340 User Manual

W7340, W7345  
Communicating Economizer Logic Modules  
FOR VENTILATION CONTROL  
PRODUCT DATA  
FEATURES  
Solid state control package provides accuracy,  
reliability and stability.  
Housed in high-impact, glass-fiber reinforced plastic  
case.  
W7340  
Terminals included for connecting optional S963B1136  
Remote Potentiometer for remote minimum damper  
position control.  
Communicates using a modified Modbus protocol.  
Case matches the lines of the M7215 Damper Motor.  
LED indicates the status of the device input.  
W7345  
W7340 Only  
APPLICATION  
Operates from the Modbus input, environmental  
sensors, and a DCV sensor to provide a totally  
integrated control system.  
The W7340 Communicating Economizer Logic Module is a full  
featured economizer that incorporates Demand Control  
Ventilation (DCV) to provide free cooling and ventilation for  
occupants in a space while saving energy.  
Combines minimum damper position potentiometer  
with solid state temperature (10K NTC) and humidity or  
enthalpy changeover control to provide economizer  
free cooling function; this control can be overridden  
by input via Modbus or DCV sensor.  
The W7345 Communicating Economizer Logic Module is a  
dry bulb only economizer that does not incorporate Demand  
Control Ventilation.  
W7345 Only  
The W7340 is used with both solid state temperature and  
humidity or enthalpy sensors. The W7345 is used with solid  
state temperature sensors only.  
Operates from the Modbus input and mixed/discharge  
air sensor to provide a temperature control system.  
Combines the Modbus indoor and/or outdoor  
temperature input with the mixed air input to provide  
economizer dry bulb free cooling function.  
Contents  
Application.........................................................................1  
Features ............................................................................1  
Specifications ....................................................................2  
Installation .........................................................................3  
Wiring ................................................................................6  
Operation...........................................................................7  
Settings and Adjustment ...................................................7  
Troubleshooting.................................................................11  
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
Table 1. Logic Module Inputs and Outputs.  
W7340 W7345  
Location and Mounting  
Inputs  
Communicating Economizer Logic Modules  
When planning the installation, allow enough clearance for  
maintenance and service. Mount the device in a location  
protected from rain, snow, and direct sunlight. The logic  
module mounts on the side of an M7215 Damper Motor or  
a
Enthalpy  
4-20 mA  
yes  
Modbus  
yes  
Return Sensor  
Mixed/Discharge Air  
optional  
directly on a sheet metal duct or panel.  
a
a
a
10K ohm  
10K ohm  
10K ohm  
NOTE: Refer to Figures 4 and 5 for representative locations  
of connected system devices.  
Outdoor Sensor  
Indoor DCV Sensor  
0-10 Vdc control signal  
optional  
Remote Minimum  
optional  
Position Potentiometer  
CAUTION  
Mounting screws longer than 5/8 in. can damage  
internal motor components.  
When mounting the module to an M7215 use only the  
included #6 5/8 in. thread-forming screw.  
Equipment Damage Hazard.  
Motor Feedback  
Outputs  
2-10 Vdc  
Modbus  
yes  
yes  
Exhaust  
One set of 24 Vac  
contacts (spst)  
MOUNTING DIRECTLY TO THE MOTOR  
1. Mount the motor.  
Motor Output Signal  
2-10 Vdc  
a
2. Secure the W7340 or W7345 to the motor using the  
2-wire (18, 20, 22 AWG) connection.  
supplied mounting screw (See Fig. 2).  
MOUNTING SEPARATE FROM THE MOTOR  
Secure the device to the sheet metal using appropriate  
fasteners (not supplied)(See Fig. 3).  
INSTALLATION  
When Installing this Product...  
1. Read these instructions carefully. Failure to follow them  
could damage the product or cause a hazardous  
condition.  
5/8 INCH SCREW INCLUDED  
WITH LOGIC MODULE.  
ECONOMIZER  
LOGIC MODULE  
2. Check the ratings given in the instructions and on the  
product to make sure the product is suitable for your  
application.  
3. Installer must be a trained, experienced service  
technician.  
4. After installation is complete, check out product  
operation as provided in these instructions.  
IMPORTANT  
All wiring must agree with applicable codes,  
ordinances and regulations.  
CAUTION  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment  
circuitry.  
Disconnect power supply before installation.  
M7215  
DAMPER  
MOTOR  
M17550B  
Fig. 2. Mounting Economizer Logic Module on Damper  
Motor.  
3
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
IMPORTANT  
Ensure proper polarity of sensor connections.  
Incorrect polarity negates the sensor signal.  
W7340B: The W7340B DCV economizer logic modules  
incorporate a minimum position setting that defaults to 20%,  
but can be overridden using the Modbus communication link.  
The W7340B DCV maximum position sets the damper position  
to a position that the damper goes to if the CO sensor fails. If  
2
the minimum position set point is higher than the DCV  
maximum position, on sensor failure, the damper goes to the  
higher of the two DCV maximum and minimum position setting.  
There is no limit on the damper position on a call from the CO  
2
sensor (DCV); the damper can go 100% open.  
W7340C: The W7340C DCV economizer logic module has the  
ability to set DCV minimum damper position and minimum  
position. The DCV minimum position is set to ventilate the  
building contaminants and the minimum position is set to  
ventilate for the building contaminants and the building  
occupants. The installer sets the damper DCV minimum  
position and the minimum position based on the design  
occupancy and CFM of outdoor air requirements for the space.  
The damper will modulate open between the DCV minimum  
damper position and the minimum position based on input  
M17638  
from a CO sensor. The damper will not drive 100% open on a  
2
call for ventilation, but can drive 100% open on a call for  
Fig. 3. Mounting to a Duct or Panel.  
cooling. If the CO sensor fails the damper will drive to the  
2
minimum position ventilating for building contaminants and  
the building occupants. If the DCV minimum position has not  
been set using the following procedure, the default setting will  
be 50% of the minimum position setting.  
Enthalpy Sensor (W7340 only)  
To measure enthalpy, the logic module accepts signals from  
either:  
— C7600C Humidity and 10K NTC temperature sensors.  
— or a C7400 Enthalpy Sensor.  
DCV Min and Min Position Damper Set Up  
Set up instructions for W7340C DCV damper positions:  
IMPORTANT  
1. Remove RAT sensor from RAT terminals.  
When using C7400 Enthalpy Sensors, connect the  
enthalpy sensors to the humidity sensor terminals;  
leave the temperature sensor terminals empty.  
Use C7400A sensor with W7340A or W7340B.  
Use C7400C sensor with W7340C.  
2. Connect CO sensor to DCV terminals.  
2
3. Apply power to economizer logic module.  
4. Wait 10 to 15 seconds for the CO2 sensor to initialize.  
Short RAT terminals.  
5. Remove CO sensor from DCV terminals.  
2
6. DCV LED will blink 2 times. If LED does not blink, cut  
power to economizer logic and repeat steps 1-5.  
7. Set DCV minimum position using MIN POS/DCV MIN  
potentiometer.  
8. Remove RAT short.  
9. DCV minimum position is saved to memory and DCV  
LED blinks 5 times.  
10. Turn off power to economizer logic module.  
11. Connect RAT sensor.  
12. Turn power on to economizer logic module.  
13. Set minimum position using MIN POS/DCV MIN  
potentiometer.  
OUTDOOR AIR SENSING  
1. Mount each sensor in any orientation that exposes it to  
freely circulating air and protects it from rain, snow, and  
direct sunlight.  
2. Connect it to the logic module.  
RETURN AIR SENSING  
1. For differential enthalpy or temperature control mount a  
second sensor in the return air duct.  
2. Connect it to the logic module.  
Demand Control Ventilation (DCV) Sensor Input  
IMPORTANT  
(W7340 only)  
The DCV sensor can be any sensor that provides a 0-10 Vdc  
Steps 3-8 must be completed within 3 minutes after  
power up otherwise the configuration process will be  
terminated, no changes will be saved and you will  
need to repeat steps 1-13.  
output over a range of 0 to 2000 ppm of CO . The DCV signal  
2
modulates the outdoor damper to provide ventilation based on  
occupancy. Mount the sensor according to the manufacturer  
specifications. If not available, mount the sensor in an area  
with unobstructed air circulation.  
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
10K NTC  
DISCHARGE  
AIR SENSOR  
INDOOR  
MODBUS  
C7232  
AIR CO2  
2
SENSOR  
DIRECT  
EXPANSION  
COIL  
MIXED AIR  
10K  
NTC  
SENSOR  
2
1
3
C7400  
INDOOR  
FAN  
ENTHALPY  
SENSOR  
DISCHARGE  
AIR  
OUTDOOR  
AIR  
M7215 MOTOR  
WITH W7340  
ECONOMIZER  
LOGIC MODULE  
1
3
C7400  
1
FOR DIFFERENTIAL ENTHALPY, THE TWO C7400 ENTHALPY SENSORS  
ARE CONNECTED TO THE ECONOMIZER MODULE—ONE IS MOUNTED  
IN THE RETURN AIR DUCT, AND THE OTHER IS MOUNTED IN THE  
OUTDOOR AIR DUCT. DIFFERENTIAL ENTHALPY CONTROL PROVIDES  
GREATER ENERGY SAVINGS THAN SINGLE ENTHALPY CONTROL.  
ENTHALPY  
SENSOR  
EXHAUST  
FAN  
2
3
USE EITHER MIXED AIR SENSOR OR DISCHARGE AIR SENSOR, NOT BOTH.  
EXHAUST AIR  
M22814  
A C7600 HUMIDITY SENSOR, USED IN CONJUNCTION WITH A 10K NTC  
TEMPERATURE SENSOR CAN BE USED INSTEAD OF A C7400 ENTHALPY SENSOR.  
FOR DRY BULB CONTROL, USE ONLY A 10K NTC TEMPERATURE SENSOR.  
RETURN AIR  
Fig. 4. Representative Locations of Connected W7340 Economizer System Devices.  
10K NTC  
DISCHARGE  
AIR SENSOR  
1
MODBUS  
DIRECT  
EXPANSION  
COIL  
MIXED AIR  
SENSOR  
10K  
NTC  
1
INDOOR  
FAN  
DISCHARGE  
AIR  
1
OUTDOOR  
AIR  
M7215 MOTOR  
WITH W7345  
ECONOMIZER  
LOGIC MODULE  
EXHAUST  
FAN  
EXHAUST AIR  
M22822  
RETURN AIR  
1
USE EITHER MIXED AIR SENSOR OR DISCHARGE AIR SENSOR, NOT BOTH.  
Fig. 5. Representative Locations of Connected W7345 Economizer System Devices.  
5
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
IMPORTANT  
WIRING  
1. All wiring must comply with applicable local codes,  
ordinances and regulations.  
2. Refer to Figures 6 and 7 for typical wiring diagrams.  
3. All inputs and outputs to the device must be 24 Vac  
Class 2.  
CAUTION  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment  
circuitry.  
4. Ensure proper polarity of sensor connections.  
Incorrect polarity negates the sensor signal.  
Disconnect power supply before installation.  
NOTE: All connections with label designation ending in 1  
(examples: TR1, P1) are ac/dc common connections.  
MOD BUS –  
MOD BUS +  
2-10 Vdc  
2-10 Vdc  
M7215  
W7340  
24 VAC  
TR1 TR  
FEEDBACK  
OUTPUT  
CONTROL  
SIGNAL INPUT  
MOD  
BUS  
L1  
L2  
1
24 VAC  
+
+
+
2-10 Vdc  
CONTROL  
SIGNAL  
2-10 Vdc  
FEEDBACK  
INPUT  
OUTPUT  
C
B
A
D
E
MIN POS/  
DCV MIN  
DCV  
SETPOINT  
3
3
+
+
+
POWER  
C7600C  
OUTDOOR  
AIR  
RETURN  
AIR TEMP  
SENSOR  
10K NTC  
DCV  
EXHAUST  
SENSOR  
CONTACTOR  
(0-10 Vdc)  
2
S963B  
HUMIDITY  
R
3
CW  
CCW  
MIXED  
OUTDOOR  
AIR TEMP  
SENSOR  
10K NTC  
C7600C  
RETURN  
AIR  
CLOSE  
OPEN  
AIR TEMP  
SENSOR  
10K NTC  
B
W
3
HUMIDITY  
1
2
3
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
OPTIONAL REMOTE MINIMUM POSITION POTENTIOMETER.  
WHEN USING C7400 ENTHALPY SENSORS, CONNECT THE ENTHALPY SENSOR TO THE  
HUMIDITY SENSOR TERMINALS. LEAVE THE TEMPERATURE SENSOR TERMINALS EMPTY.  
M23875  
Fig. 6. W7340 Typical Wiring.  
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
MOD BUS –  
MOD BUS +  
M7215  
W7345  
24 VAC  
TR1 TR  
MOD  
BUS  
L1  
L2  
1
24 VAC  
+
C
B
A
D
E
MINIMUM  
POSITION  
2
S963B  
R
CW  
CCW  
MIXED  
CLOSE  
W
OPEN  
AIR TEMP  
SENSOR  
10K NTC  
B
1
2
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
OPTIONAL REMOTE MINIMUM POSITION POTENTIOMETER.  
M23876  
Fig. 7. W7345 Typical Wiring.  
OPERATION  
SETTINGS AND ADJUSTMENT  
The purpose of the economizer logic modules are to use  
outdoor air for cooling, whenever possible, to reduce  
compressor operation.  
W7345  
Potentiometers with screwdriver adjustment slots, located on  
the face of the device, provide adjustments for Minimum  
Damper Position parameters (See Fig. 8 for locations on  
device).  
IMPORTANT  
Use C7400A sensor with W7340A or W7340B.  
Use C7400C with W7340C.  
MINIMUM  
DAMPER  
POSITION  
The W7340, when wired as shown in Fig. 6, responds to a  
signal from the Modbus. This system uses C7400 Solid State  
Enthalpy Changeover Sensor(s). The C7400 Enthalpy Sensors  
respond to both dry bulb temperature and humidity, allowing  
use of outdoor air at higher temperatures for free cooling when  
humidity is low.  
DRY BULB  
CHANGEOVER  
SETPOINT  
-
MAT  
OPEN  
C
OAT  
RAT  
STATUS LED  
MIN POS/  
DVC MIN  
The logic module functions as a first stage of cooling and  
provides maximum fuel economy during the cooling cycle. The  
logic module automatically locks out free cooling during  
heating. It holds the outdoor air damper at the minimum  
position setting.  
B
A
D
E
MBUS-  
MBUS+  
P
P1  
TR1 24V COM  
TR 24V AC  
The W7340 operates as a basic free cooling controller. Table 2  
details the input/output (I/O) logic of the W7340. The logic  
module energizes the Unit Control and Indoor Fan contacts,  
and operates according to Table 2.  
M23877  
Fig. 8. Location of W7345 Potentiometers and LED.  
7
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
Table 2. W7340 Economizer I/O Logic.  
W7340  
Potentiometers with screwdriver adjustment slots, located on  
the face of the device, provide adjustments for several  
parameters (See Fig. 9 for locations on device):  
— DCV minimum and minimum damper position.  
— Enthalpy changeover.  
INPUTS  
OUTPUTS  
Compressor  
a
Enthalpy  
b
b
DCV Outdoor Return Y1 Y2 Stage 1 Stage 2 Damper  
Below High  
set  
Low  
High  
Low  
High  
On On On  
On Off On  
On On On  
On Off Off  
On On On  
On Off On  
On On On  
On Off Off  
On  
Off  
Off  
Off  
On  
Off  
Off  
Off  
Minimum  
position  
— DCV setpoint.  
MIN POS/DCV  
MIN DAMPER  
POSITION  
c
d
e
Low  
Modulating  
Modulating  
Modulating  
ExF  
2-10 VDC  
+
-
DAMPER  
POSITION  
2-10 VDC  
DAMPER  
ENTHALPY  
CHANGEOVER  
SETPOINT  
Above High  
set  
MAT  
+
-
+
POSITION  
OVERRIDE  
OAH  
OAT  
RAT  
_
OPEN  
Low  
STATUS LED  
MIN POS/  
DCV MIN  
DEMAND  
C
B
D
+
_
CONTROL  
VENTILATION  
SETPOINT  
a
b
RAH  
For single enthalpy control, the module compares outdoor  
enthalpy to the ABCDE setpoint.  
A
E
DCV  
DCV  
SETPOINT  
500 1500  
MBUS-  
If both stages of cooling are off, the system is off and the  
damper is:  
P
P1  
MBUS+  
TR1 24V COM  
TR 24V AC  
At DCV minimum position if DCV is below setpoint.  
Modulating if DCV is above setpoint.  
M23878  
c
d
e
Modulation based on mixed air sensor signal, modulating  
between DCV minimum position and 100% open.  
Fig. 9. Location of W7340 potentiometers and LED.  
IMPORTANT  
Modulation based on DCV signal, limited by minimum  
position.  
Modulation based on the greater of the DCV and mixed air  
sensor signals.  
Before powering the device read the following Enthalpy  
changeover setpoint guidelines:  
1. Using the Enthalpy changeover setpoint, the setpoint  
can be adjusted until three minutes after powering the  
device. until three minutes after powering the device.  
2. Through the Modbus, the Enthalpy changeover  
setpoint can be modified at any time.  
Adjusting Minimum Damper Position  
The minimum position potentiometer maintains the minimum  
outdoor air flow into the building during occupied period.  
3. If the Enthalpy changeover potentiometer is changed  
after the three minute power-up time, no change to  
the Enthalpy changeover setpoint will occur unless  
power is removed from the device then reapplied.  
NOTE: If the mixed air temperature drops to 45° F (7° C), the  
mixed air sensor overrides the DCV sensor and  
closes the damper to DCV minimum position to  
protect the hot or chilled water coils from freezing.  
When the mixed air temperature rises to 48° F (9° C),  
control reverts to normal operation.  
NOTES:  
The DCV setpoint can be changed at anytime by  
adjusting the pot.  
For detailed assistance in minimum position selection,  
reference the Economizer Application Guide (form 63-8594)  
Ventilation section. The following provides basic guidelines for  
minimum position selection and adjustment:  
For Enthalpy changeover setpoint see comments  
above.  
MIN POS can be changed anytime by adjusting  
the pot.  
DCV Min can be changed by procedure on page 4.  
IMPORTANT  
1. Adjust the minimum position potentiometer to allow  
the amount of outdoor air, as required by local codes,  
to enter the building for building contaminants and the  
maximum building occupants.  
2. This procedure requires use of a quality thermometer  
capable of reading to 0.5° F (0.-17.5° C).  
Demand Control Ventilation (DCV) Setpoint  
The logic module modulates the outdoor damper to provide  
ventilation based on the 2-10 Vdc DCV sensor. With no cooling  
signal, DCV overrides the DCV minimum damper position  
when ventilation requires outdoor air.  
NOTE: Make minimum position adjustments with at least a  
10° F (-12° C) temperature difference between  
outdoor and return air.  
See section on DCV setpoint set up on page 4.  
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
Limit On Minimum Damper Position  
Differential Enthalpy Changeover Setting  
On the W7340A and B models, the logic module as shipped  
from the factory, limits the minimum position setpoint to 50%.  
The logic module will not allow a minimum position greater  
than 50% open (from fully closed).  
Differential enthalpy control uses:  
— W7340A and B use two C7400A Enthalpy Sensors  
connected to one logic module, or  
— Two 10K NTC temperature sensors and two C7600C  
Humidity Sensors connected to one logic module.  
— W7340C uses C7400C Enthalpy Sensor(s) or  
— Two 10K NTC temperature sensors and two C7600C  
Humidity Sensors connected to one logic module.  
NOTE: This setpoint limit can only be changed using a  
Modbus command.  
Equation 1. Formula to aid in minimum position adjustment.  
With outdoor and return air sensors, the logic module  
compares outdoor air to return air instead of to a setpoint as it  
does for single enthalpy. The logic module selects the lower  
enthalpy air (return or outdoor) for cooling; for example, when  
outdoor air has lower enthalpy than return air, the outdoor air  
damper opens to bring in outdoor air for free cooling.  
(TO × OA) + (TR × RA) = TM or  
(TO TR) × OA + TR = TM  
Where:  
TO = Outdoor air temperature  
OA = Percent of outdoor air  
TR = Return air temperature  
RA = Percent of return air  
TM = Resulting mixed air temperature  
NOTE: When using the W7340 for differential enthalpy, keep  
the setpoint potentiometer set at D.  
Exhaust Setpoint (W7340 only)  
The exhaust setpoint determines when the exhaust fan will run  
based on the damper position.  
NOTE: The following sample calculation uses only  
Fahrenheit temperature.  
The logic module, as shipped from the factory, uses an  
exhaust setpoint of 25%. When the damper position is greater  
than 25% open (from fully closed), relay contact for the  
exhaust fan is closed. When the damper position is below 22%  
open, the relay is de-energized.  
EXAMPLE: Assume local codes require 10% outdoor air  
during occupied conditions, outdoor air is 60° F  
and return air is 75° F. Under these conditions,  
what is the temperature of the mixed air?  
(0.1x6° F) + (0.9x75° F) = 6.0° F + 67.5° F = 73.5° F or  
(60° F 75° F) × 0.1 + 75° F = – 1.5 + 75° F = 73.5° F  
Control Configuration (W7340 only)  
The W7340 can be configured for humidity or enthalpy  
sensors. Configuration can be performed manually or over the  
Modbus.  
Mixed air will be 73.5° F when OA is 60° F and RA is 75° F with  
10 percent outdoor air entering the building.  
IMPORTANT  
NOTE: The W7340C model min position and DCV min must  
be set in the field by the installer. See Section DCV  
Min and Min Position Damper Set up.  
If only a temperature sensor is connected to the  
W7340, the device will operate using dry bulb  
changeover control.  
To configure the W7340 manually:  
Enthalpy Changeover (W7340 only)  
1. Within the first three minutes after powering the device,  
short the external minimum damper position terminals  
(P-P1).  
Outdoor Enthalpy Changeover Setpoint (Single  
Enthalpy Changeover)  
The outdoor enthalpy changeover setpoint returns the outdoor  
air damper to minimum position when enthalpy rises above its  
setpoint. Enthalpy setpoint scale markings, located on the  
device, are A, B, C, D and E. See Fig. 10 for the corresponding  
control point.  
NOTE: The LED will go solid within five seconds of  
shorting these terminals.  
2. Maintaining the short for another five seconds causes  
the LED to flash quick pulses (between off periods)  
indicating the sensor configuration type:  
a. Two quick pulses: Humidity.  
b. Three quick pulses: Enthalpy.  
3. To toggle the sensor configuration type:  
a. Remove the short until the LED goes solid again.  
b. Reapply the short for another five seconds.  
NOTE: Once the short is removed for over 10 seconds,  
the device saves the most recent configuration.  
9
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
85  
90  
95 100 105 110  
(29) (32) (35) (38) (41) (43)  
CONTROL CONTROL POINT  
CURVE  
APPROX. °F (°C)  
AT 50% RH  
80  
(27)  
A
B
C
D
E
73 (23)  
70 (21)  
67 (19)  
63 (17)  
55 (13)  
75  
(24)  
70  
(21)  
65  
(18)  
60  
60  
(16)  
A
55  
(13)  
B
50  
(10)  
C
45  
(7)  
D
40  
(4)  
E
35  
(2)  
1
A
B
C
D
E
35  
(2)  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
95 100 105 110  
(4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)  
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)  
HIGH LIMIT CURVE FOR W7210D, W7212, W7213, W7214, W7340B.  
M23879  
1
Fig. 10. W7340 Performance Characteristics for Enthalpy Changeover Settings.  
Table 3. W7345 Performance Characteristics  
for Temperature Changeover Settings.  
Approximate Control Point  
Temperature  
Changeover Setting  
°F  
73  
70  
67  
63  
55  
°C  
23  
21  
19  
17  
13  
A
B
C
D
E
63-2569—04  
10  
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
Table 4. W7340 Economizer Checkout.  
TROUBLESHOOTING  
Pulse  
count  
Diagnostic  
bit  
Description  
The status LED is visible through a hole in the device cover. A  
priority-based LED flash sequence indicates a detected fault.  
0.25 seconds elapses between each pulse, a higher pulse  
count indicates higher priority. A two-second on period  
precedes each repeated sequence.  
Booting (0-3 min. after power-up)  
Mixed air temperature sensor fault  
Outdoor air temperature sensor fault  
Outdoor air humidity sensor fault  
Return air temperature sensor fault  
Return air humidity sensor fault  
Indoor air quality sensor fault  
Actuator fault  
NA  
8
12  
7
7
6
6
5
The diagnostic bit position corresponds to the Modbus  
diagnostic register. The diagnostic bit resets when the  
respective fault is present. To read all active faults, read the  
diagnostic register via Modbus function code 8 (no flash  
priority needed).  
4
3
3
2
2
1
1
0
NOTES:  
Proper operation (outdoor air  
appropriate for free cooling)  
Solid  
ON  
All pulse counts (Table 4) are based on the  
number of times the light pulses off.  
In the event of a Communications Failure, the LED  
NA  
NA  
Proper operation (NO free cooling) 2 Hz flash  
pulses on for 0.25 seconds every 2 seconds.  
Communications failure  
1 (pulses  
on)  
NA  
11  
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
customer.honeywell.com  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Toronto, Ontario M1V 4Z9  
® U.S. Registered Trademark  
© 2007 Honeywell International Inc.  
63-2569—04 J.I. Rev. 06-07  
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