Honeywell W7340, W7345 User Manual

W7340, W7345

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.

• 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.

W7340 Only

APPLICATION

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.

The W7345 Communicating Economizer Logic Module is a
dry bulb only economizer that does not incorporate Demand
Control Ventilation.

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, environmental
sensors, and a DCV sensor to provide a totally
integrated control system.

• 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.

W7345 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

63-2569—04

W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES

SPECIFICATIONS

Models:

W7340: Communicating Economizer Logic Module with

minimum position potentiometer, setpoints for enthalpy or
dry-bulb, and DCV.

W7345: Communicating Economizer Logic Module with

minimum position potentiometer and setpoint for dry-bulb
temperature only.

IMPORTANT

W7340A, W7340B and W7345A:

1. Do not have the ability to set DCV minimum position
for damper position for demand control ventilation.
Damper may drive 100% open on call from CO
sensor.

2. Do not have the E (enthalpy or dry bulb) curve
setting.

3. W7340C has the ability to set DCV minimum position
and has the E curve setting.

Dimensions: See Fig. 1.

Temperature Ratings:

Operating Ambient: -40 to +149 °F (-40 to +65 °C).
Shipping: -25 to +125 °F (-32 to +52 °C).

Humidity Ratings:

Noncondensing: 5 to 95% RH.
Condensing: 100% RH.

Inputs and Outputs: See Table 1.

Electrical Ratings:

Input Voltage: 24 Vac ±25%; 50/60 Hz (Class 2).
Nominal Power Consumption (at 24 Vac, 60 Hz): 5 VA.
Relay Contact Rating at 30 Vac (maximum power from class 2

input only): 1.5 A run, 7.5 A inrush.

Patents:

U.S. Patent 6,1,764.
Other Patents Pending.

2

Approvals:

cUL listed.
Underwriters Laboratories Inc. listed:

Meets UL873 plenum requirements.

Meets UL94-5VA plenum flammability requirements.
FCC Part 15 Class B.
CE.
This product complies with Title 24 Part 6 CEC standard for

Residential and Non-Residential Buildings - 2005, when

installed according to instructions.

4-1/16

(103)

1-15/16

(49)

1-3/4 (44)

4-7/16 (112)

1-3/8

(35)

5/8

(16)

M22813

Fig. 1. Dimensions of W7340 and W7345 in inches (mm).

Accessories:

32005191-001 Sensor, 10K ohm with 2-1/4 in. (57 mm) probe.
C7150B1046 Mixed Air Sensor, 10K ohm with mounting

bracket.
C7232 Carbon Dioxide Sensor for DCV.
C7632 Carbon Dioxide Sensor for DCV.
C7400A Solid State Enthalpy Sensor for use with W7340A

and W7340B.
C7400C Solid State Enthalpy Sensor for use with W7340C.
C7600C Relative Humidity Sensor.
S963B1136 Remote Potentiometer to provide remote control

of damper minimum position.
ST6008 Energy Management Timer for occupied/unoccupied

control.
ST7009 Electronic Programmable Timer for occupied/

unoccupied control.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE

If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:

1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

63-2569—04 2

®

Catalog or price sheets for complete ordering number.

1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386

W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES

CAUTION

CAUTION

Table 1. Logic Module Inputs and Outputs.

W7340 W7345

Inputs

Enthalpy

Modbus yes yes

Return Sensor optional —

Mixed/Discharge Air

Outdoor Sensor

Indoor DCV Sensor 0-10 Vdc control signal —

Remote Minimum
Position Potentiometer

Motor Feedback 2-10 Vdc —

Outputs

Modbus yes yes

Exhaust One set of 24 Vac

Motor Output Signal 2-10 Vdc —

a

2-wire (18, 20, 22 AWG) connection.

4-20 mA

10K ohm

10K ohm

optional optional

contacts (spst)

a

a

a

—

10K ohm

—

—

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.

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.

Location and Mounting

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
directly on a sheet metal duct or panel.

a

NOTE: Refer to Figures 4 and 5 for representative locations

of connected system devices.

Equipment Damage Hazard.
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.

MOUNTING DIRECTLY TO THE MOTOR

1. Mount the motor.

2. Secure the W7340 or W7345 to the motor using the

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).

5/8 INCH SCREW INCLUDED
WITH LOGIC MODULE.

ECONOMIZER
LOGIC MODULE

IMPORTANT

All wiring must agree with applicable codes,
ordinances and regulations.

Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.

Disconnect power supply before installation.

M7215
DAMPER
MOTOR

Fig. 2. Mounting Economizer Logic Module on Damper

Motor.

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M17550B

W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES

M17638

IMPORTANT

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
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
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
from a CO2 sensor. The damper will not drive 100% open on a

Fig. 3. Mounting to a Duct or Panel.

call for ventilation, but can drive 100% open on a call for
cooling. If the CO
minimum position ventilating for building contaminants and

Enthalpy Sensor (W7340 only)

To measure enthalpy, the logic module accepts signals from
either:

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.

— C7600C Humidity and 10K NTC temperature sensors.
— or a C7400 Enthalpy Sensor.

IMPORTANT

• 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.

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.

DCV Min and Min Position Damper Set Up

Set up instructions for W7340C DCV damper positions:

1. Remove RAT sensor from RAT terminals.

2. Connect CO2 sensor to DCV terminals.

3. Apply power to economizer logic module.

4. Wait 10 to 15 seconds for the CO2 sensor to initialize.

5. Remove CO

6. DCV LED will blink 2 times. If LED does not blink, cut

7. Set DCV minimum position using MIN POS/DCV MIN

8. Remove RAT short.

9. DCV minimum position is saved to memory and DCV

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.

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

Demand Control Ventilation (DCV) Sensor Input (W7340 only)

The DCV sensor can be any sensor that provides a 0-10 Vdc
output over a range of 0 to 2000 ppm of CO
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.

. The DCV signal

2

IMPORTANT

• Ensure proper polarity of sensor connections.
Incorrect polarity negates the sensor signal.

sensor fails. If

2

sensor fails the damper will drive to the

2

Short RAT terminals.

sensor from DCV terminals.

2

power to economizer logic and repeat steps 1-5.

potentiometer.

LED blinks 5 times.

potentiometer.

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.

2

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