Honeywell W7340 Ventilation Hood User Manual
Contents
1. lt Grad A 2 ENTHALPY SENSOR MIXED AIR I 10K SENSOR INDOOR A FAN DISCHARGE AIR LOGIC MODULE I M7215 MOTOR OUTDOOR I WITH W7340 AIR ECONOMIZER C7400 ENTHALPY SENSOR A 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 A USE EITHER MIXED AIR SENSOR OR DISCHARGE AIR SENSOR NOT BOTH EXHAUST AIR v M22814 A 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 MODBUS r DIRECT EXPANSION Y MIXED AIR 10K SENSOR uc NTC INDOOR N FAN DISCHARGE AIR OUTDOOR AIR M7215 MOTOR l I WITH W7345 l ECONOMIZER LOGIC MODULE EXHAUST AIR M22822 N USE EITHER MIXED AIR SENSOR OR DISCHARGE AIR SENSOR NOT BOTH RETURN AIR Fig 5 Representative Locations of Connected W7345 Economizer System Devices 5 63 2569 04 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES WIRING 2 N CAUTION 3 4 Electrical Shock or Equipme2. Tox OA RA or T OX OAST Where To Outdoor air temperature OA Percent of outdoor air T4 Return air temperature RA Percent of return air Resulting mixed air temperature NOTE The following sample calculation uses only Fahrenheit temperature EXAMPLE Assume local codes require 1096 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 67 5 F 73 5 or 60 75 F x0 1 75 F 1 5 75 73 5 F 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 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 Enthalpy Changeover W7340 only 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 Differential Enthalpy Changeover Setting 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 c
3. 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 IMPORTANT All wiring must agree with applicable codes ordinances and regulations N CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation 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 NOTE Refer to Figures 4 and 5 for representative locations of connected system devices N CAUTION 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 MOUN
4. M TR 24V AC M23877 Fig 8 Location of W7345 Potentiometers and LED 63 2569 04 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES 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 DCV setpoint MIN POS DCV MIN DAMPER POSITION DAMPER ENTHALPY FRO VDC CHANGEOVER POSITION SETPOINT OVERRIDE OPEN OAT T STATUS LED MIN POS DCV MIN DEMAND CONTROL VENTILATION SETPOINT RAT B s 9 Dev Dev SETPOINT 50071500 MBUS ui MBUS TR1 24V COM TR 24V M23878 Fig 9 Location of W7340 potentiometers and LED IMPORTANT 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 3 Ifthe 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 DCV setpoint can be changed at anytime by adjusting the pot For Enthalpy changeover setpoint see comments ab
5. MUM POSITION POTENTIOMETER M23876 Fig 7 W7345 Typical Wiring OPERATION The purpose of the economizer logic modules are to use outdoor air for cooling whenever possible to reduce compressor operation IMPORTANT Use C7400A sensor with W7340A or W7340B Use C7400C with W7340C 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 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 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 SETTINGS AND ADJUSTMENT 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 MINIMUM DAMPER POSITION DRY BULB CHANGEOVER SETPOINT STATUS LED OPEN OAT A MIN POS DVC MIN RAT B ioi O MBUS MBUS POP TRI 24V CO
6. TING 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 DAMPER MOTOR M17550B Fig 2 Mounting Economizer Logic Module on Damper Motor 63 2569 04 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES M17638 Fig 3 Mounting to a Duct or Panel 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 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 Connectit to the logic module RETURN AIR SENSING 1 For differential enthalpy or temperature control mount a second sensor in the return air duct 2 Connectit to the logic module Demand Control Ventilation DCV Sensor Input W7340 only The DCV sensor can be any sensor that provides 0 10 output over a range of 0 to 2000 ppm of The signal modulates the outdoor damper to provide ventilation based on occupancy Mount the sensor accordin
7. W7340 W7345 Honeywell 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 PRODUCT DATA FEATURES Solid state control package provides accuracy reliability and stability e Housed in high impact glass fiber reinforced plastic case Terminals included for connecting optional 596381136 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 WT345 Only Operates from th
8. building during occupied period NOTE Ifthe 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 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 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 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 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Limit On Minimum Damper Position On the W7340A and B models the logic module as shipped from the factory limits the minimum position setpoint to 5096 The logic module will not allow a minimum position greater than 50 open from fully closed NOTE This setpoint limit can only be changed using a Modbus command Equation 1 Formula to aid in minimum position adjustment
9. can drive 10096 open on a call for cooling If the CO sensor fails the damper will drive to the 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 5096 of the minimum position setting DCV Min and Min Position Damper Set Up Set up instructions for W7340C DCV damper positions Remove RAT sensor from RAT terminals Connect CO sensor to DCV terminals Apply power to economizer logic module Wait 10 to 15 seconds for the CO2 sensor to initialize Short RAT terminals Remove CO sensor from DCV terminals DCV LED will blink 2 times If LED does not blink cut power to economizer logic and repeat steps 1 5 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 Oe ee B IMPORTANT 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 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES 10K NTC DISCHARGE MODBUS C7232 Meis d AIR SENSOR SENSOR r DIRECT EXPANSION
10. d precedes each repeated sequence 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 NOTES pulse counts Table 4 are based on the number of times the light pulses off In the event of a Communications Failure the LED pulses on for 0 25 seconds every 2 seconds Table 4 W7340 Economizer Checkout Pulse Diagnostic Description count bit Booting 0 3 min after power up NA 12 Mixed air temperature sensor fault 8 7 Outdoor air temperature sensor fault 7 6 Outdoor air humidity sensor fault 6 5 Return air temperature sensor fault 4 3 Return air humidity sensor fault 3 2 Indoor air quality sensor fault 2 1 Actuator fault 1 0 Proper operation outdoor air Solid appropriate for free cooling ON NA Proper operation NO free cooling 2 Hz flash NA Communications failure 1 pulses on NA 63 2569 04 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Toronto Ontario M1V 4Z9 customer honeywell com U S Registered Trademark Printed in U S A led 2007 Honeywell International Inc dcin ah tat MEI
11. e 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 AppliCatiQn eu eee dena E 1 Features 1 Specifications encierra teen pee 2 Installatiori euet reet teet endet 3 ecrire coser a eodd eese bete e Sins 6 Operation Ren 7 Settings and Adjustment essen 7 Troubleshooting nq inet sinere 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 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 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 t
12. g to the manufacturer specifications If not available mount the sensor in an area with unobstructed air circulation 63 2569 04 4 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 2096 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 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 CO2 sensor DCV the damper can go 10096 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 sensor The damper will not drive 100 open on a call for ventilation but
13. nt Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation NOTE 2 10 FEEDBACK OUTPUT 2 10 CONTROL SIGNAL INPUT 2 10 FEEDBACK CONTROL 5 INPUT SIGNAL Ex OUTPUT e C 1 MIN POS B D DCV i DCV MIN SETPOINT RETURN AIR TEMP SENSOR 10K NTC OUTDOOR AIR HUMIDITY OUTDOOR AIR TEMP SENSOR 10K NTC 10K NTC IMPORTANT 1 All wiring must comply with applicable local codes ordinances and regulations Refer to Figures 6 and 7 for typical wiring diagrams All inputs and outputs to the device must be 24 Vac Class 2 Ensure proper polarity of sensor connections Incorrect polarity negates the sensor signal All connections with label designation ending in 7 examples TR1 P1 are ac dc common connections MOD BUS MOD BUS M7215 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED N oP TIONAL REMOTE MINIMUM POSITION POTENTIOMETER A wren 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 63 2569 04 6 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES MINIMUM POSITION MIXED AIR TEMP SENSOR 10K NTC MOD BUS MOD BUS 24 VAC M7215 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED JA optiona REMOTE MINI
14. o 9596 RH Condensing 10096 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 ORDERING INFORMATION 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 1 15 16 49 Y Y 1 3 4 44 4 16 112 1 3 8 35 Y 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 596381136 Remote Potentiometer to provide remote control of damper minimum position ST6008 Energy Management Timer for occupied unoccupied control ST7009 Electronic Programmable Timer for occupied un
15. occupied control When purchasing replacement and modernization products from your TRADELINE wholesaler or distributor refer to the TRADELINE Catalog or price sheets for complete ordering number 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 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Toronto Ontario M1V 429 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 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Table 1 Logic Module Inputs and Outputs W7340 W7345 Inputs Enthalpy 4 20 mA Modbus yes yes Return Sensor optional Mixed Discharge Air 10K ohm 10K ohm Outdoor Sensor 10K ohm Indoor DCV Sensor 0 10 control signal Remote Minimum optional optional Position Potentiometer Motor Feedback 2 10 Vdc Outputs Modbus yes yes Exhaust One set of 24 Vac contacts spst Motor Output Signal 2 10 Vdc 2 wire 18 20 22 AWG connection INSTALLATION When
16. onnected to one logic module W7340C uses C7400C Enthalpy Sensor s Two 10K NTC temperature sensors and two C7600C Humidity Sensors connected to one logic module 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 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 The logic module as shipped from the factory uses an exhaust setpoint of 2596 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 2296 open the relay is de energized Control Configuration W7340 only The W7340 can be configured for humidity or enthalpy sensors Configuration can be performed manually or over the Modbus IMPORTANT If only a temperature sensor is connected to the W7340 the device will operate using dry bulb changeover control To configure the W7340 manually 1 Within the first three minutes after powering the device short the external minimum damper position
17. ove MIN POS can be changed anytime by adjusting the pot DCV Min can be changed by procedure on page 4 Demand Control Ventilation DCV Setpoint The logic module modulates the outdoor damper to provide ventilation based on the 2 10 DCV sensor With no cooling signal DCV overrides the DCV minimum damper position when ventilation requires outdoor air 63 2569 04 8 Table 2 W7340 Economizer I O Logic INPUTS OUTPUTS Enthalpy Compressor DCV Outdoor Return 1 v2 Stage 1 Stage 2 Damper Below High Low On Minimum set On Of On Off position Low High On On off Modulating On Off Off off Above High Low On On On On Modulating l On Off Low High On On Off Modulating On Off Off Off For single enthalpy control the module compares outdoor enthalpy to the ABCDE setpoint P If both stages of cooling are off the system is off and the damper is At DOV minimum position if DCV is below setpoint Modulating if DCV is above setpoint Modulation based on mixed air sensor signal modulating between DCV minimum position and 10096 open d Modulation based on DCV signal limited by minimum position Modulation based on the greater of the DCV and mixed air sensor signals Adjusting Minimum Damper Position The minimum position potentiometer maintains the minimum outdoor air flow into the
18. paper containing at least 1096 63 2569 04 J I Rev 06 07 post consumer paper fibers Honeywell
19. terminals P P1 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 63 2569 04 G X DS X E NWA 4 7 2 po SU qr y dE e a Zu J SX OL XZ EE My a ox mn DN SN ae ROO E NSSNSA MT 1 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES A HIGH LIMIT CURVE FOR Fig 10 W7340 Performance Characteristics for Enthalpy Changeover Settings Table 3 W7345 Performance Characteristics for Temperature Changeover Settings Approximate Control Point 70 67 63 55 Temperature Changeover Setting 04 63 2569 W7340 W7345 COMMUNICATING ECONOMIZER LOGIC MODULES TROUBLESHOOTING 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 perio
Download Pdf Manuals
Related Search