Honeywell W7340 User Manual

PRODUCT DATA
63-2569—04
W7340, W7345
Communicating Economizer Logic Modules
FOR VENTILATION CONTROL
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.
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
• 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.
W7340
W7345
Contents
Application.........................................................................1
Features ............................................................................1
Specifications ....................................................................2
Installation .........................................................................3
Wiring ................................................................................6
Operation...........................................................................7
Settings and Adjustment ...................................................7
Troubleshooting.................................................................11

Honeywell W7340 Specifications

General

Power Supply / Input Voltage	24 VAC
Temperature Range	32°F to 122°F (0°C to 50°C)
Display	LCD
Output Type	Relay
Frequency	50 Hz; 60 Hz
Control Method	PID Control
Compatibility	Compatible with HVAC systems
Humidity Range	5 to 90% RH (non-condensing)

Summary

APPLICATION

W7340 Only

Describes the W7340 Economizer Logic Module's operation with environmental and DCV sensors for integrated control.

W7345 Only

Details the W7345 Economizer Logic Module's operation using Modbus input and mixed/discharge air sensors for temperature control.

SPECIFICATIONS

ORDERING INFORMATION

Location and Mounting

Mounting Directly to the Motor

Instructions for securely attaching the economizer logic module to an M7215 damper motor using a supplied screw.

Mounting Separate from the Motor

Guidance on mounting the economizer logic module to sheet metal using appropriate fasteners.

INSTALLATION

Enthalpy Sensor (W7340 only)

Details connecting C7600C Humidity and 10K NTC sensors or C7400 Enthalpy Sensor for W7340.

Outdoor Air Sensing

Instructions for mounting and connecting outdoor air sensors to the logic module for optimal performance.

Return Air Sensing

Procedure for mounting and connecting a second sensor in the return air duct for temperature or enthalpy control.

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

Explains connecting a 0-10 Vdc DCV sensor to modulate the outdoor damper based on occupancy.

DCV Min and Min Position Damper Set Up

Step-by-step guide for configuring DCV minimum and minimum damper positions using potentiometers for W7340C.

WIRING

OPERATION

SETTINGS AND ADJUSTMENT

Demand Control Ventilation (DCV) Setpoint

Details how to adjust the DCV setpoint via potentiometer to modulate the outdoor damper for ventilation.

Adjusting Minimum Damper Position

Explains using the minimum position potentiometer to maintain minimum outdoor air flow during occupied periods.

Limit On Minimum Damper Position

Describes the W7340A/B factory default limit of 50% minimum position, adjustable via Modbus.

Enthalpy Changeover (W7340 only)

Covers single and differential enthalpy changeover settings, including sensor configurations and setpoint selection.

Exhaust Setpoint (W7340 only)

Defines the exhaust setpoint, determining when the exhaust fan runs based on damper position (factory default 25%).

Control Configuration (W7340 only)

Explains how to configure the W7340 for humidity or enthalpy sensors manually or via Modbus.

TROUBLESHOOTING