Wells WVU-31CT User manual

WELLS MANUFACTURING
10 Sunnen Dr., St. Louis, MO 63143
telephone: [phone]
fax: [phone]
www.wellsbloomfield.com
IMPORTANT: DO NOT DISCARD THIS MANUAL
This manual is considered to be part of the appliance and is to be given to the OWNER or
MANAGER of the restaurant, or to the person responsible for TRAINING OPERATORS of
this appliance. Additional manuals are available from your WELLS DEALER.
THIS MANUAL MUST BE READ AND UNDERSTOOD BY ALL PERSONS USING OR
INSTALLING THIS APPLIANCE. Contact your WELLS DEALER if you have any
questions concerning installation, operation or maintenance of this equipment.
OWNERS MANUAL
COUNTERTOP
VENTLESS UNIVERSAL
HOOD SYSTEM
for
COUNTERTOP ELECTRIC
APPLIANCES
MODEL
WVU-31CT
Manual Includes
INSTALLATION
USE & CARE
EXPLODED VIEW
PARTS LIST
WIRING DIAGRAM
524
p/n 2M-Z17951, Rev. A M524 140417
IL2732

Unless otherwise specied, all commercial cooking
equipment manufactured by Wells Manufacturing is
warranted against defects in materials and workmanship
for a period of one year from the date of original installation
or 18 months from the date of shipment from our factory,
whichever comes rst, and is for the benet of the original
purchaser only.
THIS WARRANTY IS THE COMPLETE AND ONLY
WARRANTY, EXPRESSED OR IMPLIED IN LAW
OR IN FACT, INCLUDING BUT NOT LIMITED TO,
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR
ANY PARTICULAR PURPOSE, AND/OR FOR DIRECT,
INDIRECT OR CONSEQUENTIAL DAMAGES IN
CONNECTION WITH WELLS BLOOMFIELD PRODUCTS.
This warranty is void if it is determined that, upon inspection
by an authorized service agency, the equipment has been
modied, misused, misapplied, improperly installed, or
damaged in transit or by re, ood or act of God. It also does
not apply if the serial nameplate has been removed, or if
service is performed by unauthorized personnel. The prices
charged by Wells Manufacturing for its products are based
upon the limitations in this warranty. Seller’s obligation
under this warranty is limited to the repair of defects without
charge by a Wells Manufacturing factory authorized service
agency or one of its sub-service agencies. This service
will be provided on customer’s premises for non-portable
models. Portable models (a device with a cord and plug)
must be taken or shipped to the closest authorized service
agency, transportation charges prepaid, for service. In
addition to restrictions contained in this warranty, specic
limitations are shown in the Service Policy and Procedure
Guide. Wells Manufacturing authorized service agencies
are located in principal cities. This warranty is valid in the
United States and Canada and void elsewhere. Please
consult your classied telephone directory, your foodservice
equipment dealer or contact:
Wells Manufacturing
10 Sunnen Dr., St. Louis MO 63143 USA
phone [phone] or fax [phone]
for information and other details concerning warranty.
LIMITED WARRANTY STATEMENT
SERVICE POLICY AND PROCEDURE GUIDE and ADDITIONAL WARRANTY EXCLUSIONS
NOTE: For your protection, please note that equipment
in this shipment was carefully inspected and packaged
by skilled personnel before leaving the factory. Upon
acceptance of this shipment, the transportation company
assumes full responsibility for its safe delivery.
IF SHIPMENT ARRIVES DAMAGED:
1. VISIBLE LOSS OR DAMAGE: Be certain that any
visible loss or damage is noted on the freight bill or
express receipt, and that the note of loss or damage is
signed by the delivery person.
2. FILE CLAIM FOR DAMAGE IMMEDIATELY:
Regardless of the extent of the damage.
3. CONCEALED LOSS OR DAMAGE: if damage is
unnoticed until the merchandise is unpacked, notify the
transportation company or carrier immediately, and le
“CONCEALED DAMAGE” claim with them. This
should be done within fteen (15) days from the date
the delivery was made to you. Be sure to retain the
container for inspection.
Wells Manufacturing cannot assume liability for damage or
loss incurred in transit. We will, however, at your request,
supply you with the necessary documents to support your
claim.
SHIPPING DAMAGE CLAIM PROCEDURE
xi
1. Resetting of safety thermostats, circuit breakers, over
load protectors, and/or fuse replacements are not
covered by this warranty unless warranted conditions
are the cause.
2. All problems due to operation at voltages or phase
other than specied on equipment nameplates are
not covered by this warranty.
Conversion to correct voltage and/or phase must be
the customer’s responsibility.
3. All problems due to electrical connections not made
in accordance with electrical code requirements
and wiring diagrams supplied with the equipment are
not covered by this warranty.
4. Replacement of items subject to normal wear, to
include such items as knobs, light bulbs; and, normal
maintenance functions including adjustments of
thermostats, adjustment of micro switches and
replacement of fuses and indicating lights are not
covered by warranty.
5. Damage to electrical cords and/or plug due to exposure
to excessive heat are not covered by this warranty.
6. Full use, care, and maintenance instructions supplied
with each machine. Noted maintenance and
preventative maintenance items, such as servicing and
cleaning schedules, are customer responsibility. Those
miscellaneous adjustments noted are customer
responsibility. Proper attention to preventative
maintenance and scheduled maintenance procedures
will prolong the life of the appliance.
7. Travel mileage is limited to sixty (60) miles from an
Authorized Service Agency or one of its sub-service
agencies.
8. All labor shall be performed during regular working
hours. Overtime premium will be charged to the buyer.
9. All genuine Wells replacement parts are warranted
for ninety (90) days from date of purchase on non-
warranty equipment. This parts warranty is limited only
to replacement of the defective part(s). Any use of
non-genuine Wells parts completely voids any
warranty.
10. Installation, labor, and job check-outs are not
considered warranty and are thus not covered by this
warranty.
11. Charges incurred by delays, waiting time or operating
restrictions that hinder the service technician’s ability to
perform service are not covered by warranty. This
includes institutional and correctional facilities.

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
1
WARRANTY xi
ELECTRICAL SPECIFICATIONS 1
WARNINGS - ENGLISH 2
WARNINGS - FRENCH 3
CLEARANCES 4
FIRE SUPPRESSION SYSTEM 5
FEATURES & OPERATING CONTROLS 6-7
PRECAUTIONS & GENERAL INFORMATION 8
AGENCY LISTING INFORMATION 9
INSTALLATION 9
Unpacking & Inspection 9
Components 9
Under-Hood Appliance Limitations 10
Service Technician Installation Notes 11
Site Preparation 12
Mechanical Installation 13
Electrical Installation 14-15
ANSUL® INSTALLATION & SETUP 14-15
Fire Suppression System Installation 16
Filter Installation 17
OPERATION 18
Control Panel 18
Operation Lights 18
CLEANING INSTRUCTIONS 19-20
REQUIRED MAINTENANCE & MAINTENANCE LOGS 21-25
TROUBLESHOOTING SUGGESTIONS 26
WIRING DIAGRAM 27
EXPLODED VIEW & PARTS LIST 28-33
Thank You for purchasing this Wells Manufacturing appliance.
Proper installation, professional operation and consistent maintenance of this appliance will ensure
that it gives you the very best performance and a long, economical service life.
This manual contains information and instructions for the ventless ventilation hood, its use and care.
For information regarding cooking appliance(s), please refer to the manufacturer’s operation manual.
TABLE OF CONTENTS
ELECTRICAL SPECIFICATIONS
INTRODUCTION
Model Volts Amps Power Supply
WVU-31CT 208/240V 1.9 For supply connection use #12 AWG copper wire only.

2
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
WARNINGS - ENGLISH
IMPORTANT: DO NOT DISCARD THIS MANUAL
This manual is considered to be part of the appliance and is to be given to the OWNER or
MANAGER of the restaurant, or to the person responsible for TRAINING OPERATORS of this
appliance. Additional manuals are available from your WELLS DEALER.
THIS MANUAL MUST BE READ AND UNDERSTOOD BY ALL PERSONS USING OR INSTALLING THIS
APPLIANCE. Contact your WELLS DEALER if you have any questions concerning installation, operation
or maintenance of this equipment.
DANGER
FIRE HAZARD
Fire suppression system must be charged and
certied by an authorized Ansul® distributor.
DO NOT attempt to modify or bypass the re
suppression system.
An uncontrolled re can cause serious injury or
death.
WARNING:
If the re suppression system is
discharged, a buzzer will sound
continuously. The unit will remain
inoperable until the re suppression system
is serviced, recharged and reset by an
authorized Ansul® distributor.
NOTE:
If a REMOTE MANUAL PULL STATION
is installed, moving the ventilator for any
reason may cause the Ansul® system to
discharge.
DANGER - DO NOT BLOCK ACCESS
TO THE FIRE EXTINGUSHING
MANUAL PULL.
DANGER:
SUFFOCATION HAZARD
“Do not attempt to use this ventilator with
gas-red units. This ventilator will not
remove products of combustion. Unvented
exhaust gasses can be deadly.”
WARNING:
SHOCK HAZARD
All servicing requiring access to non-insulated
electrical components must be performed by
a factory authorized technician.
DO NOT open any access panel which
requires the use of tools. Failure to follow this
warning can result in severe electrical shock.
WARNING:
RISK OF INJURY
Installation procedures must be performed by
a qualied technician with full knowledge of all
applicable electrical codes. Failure can result
in personal injury and property damage.
WARNING:
SLIP AND FALL HAZARD
DO NOT operate any grease-producing
cooking appliance unless the grease cup
is properly installed. Oil will drip onto oor
creating a slipping hazard.
WARNING:
DO NOT attempt to wash the HEPA /
CHARCOAL lter pack or pre-lter. Water
absorption will render the lter unusable.
Use of a wet or clogged lter will cause the
ventilator system to shut down. Use only
new, clean Wells® Authorized Service Parts.
Keep spare lter packs on hand to avoid
distrupions. Service Department 1-314-678-
6314.
Exposed surfaces can be hot to the touch and
may cause burns. Allow unit to cool before
cleaning or servicing.

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
3
WARNINGS - FRENCH
IMPORTANT : NE JETEZ PAS CE MANUEL
Ce manuel fait partie intégrante de l’appareil et doit être remis au PROPRIÉTAIRE, au GÉRANT
du restaurant ou au responsable de la FORMATION DES UTILISATEURS. Des manuels
supplémentaires sont disponibles auprès de votre concessionnaire WELLS.
TOUTE PERSONNE INSTALLANT OU UTILISANT CET APPAREIL DOIT LIRE CE MANUEL ET
S’ASSURER DE L’AVOIR COMPRIS.
Veuillez contacter votre CONCESSIONNAIRE WELLS pour toute question concernant
l’installation, l’utilisation ou l’entretien de cet équipement.
DANGER
RISQUE D’INCENDIE
Le système anti-incendie doit être chargé
et certié par un distributeur agréé Ansul®.
N’essayez PAS de modier ou de
contourner le système anti-incendie.
Un feu hors de contrôle risque de
provoquer des blessures graves, voire
mortelles.
AVERTISSEMENT :
Une alarme sonore se déclenche en
continu si le système anti-incendie est
déchargé. L’unité reste inutilisable
jusqu’à ce qu’un distributeur agréé Ansul®
effectue son intervention, le recharge et le
réinitialise.
REMARQUE :
Si un AVERTISSEUR D’INCENDIE À
DISTANCE MANUEL est installé, tout
déplacement du ventilateur, quel qu’en soit
le motif, peut provoquer la décharge du
système Ansul®.
DANGER - NE PAS BLOQUER
L’ACCÈS À LA POIGNÉE DE
L’EXTINCTEUR !
DANGER :
RISQUE DE SUFFOCATION
“Ce ventilateur ne doit pas être utilisé avec
des appareils à gaz. Il n’absorbe pas les
produits de combustion. En l’absence de
sortie d’aération, les gaz de combustion
peuvent être mortels.”
AVERTISSEMENT :
RISQUE DE DÉCHARGE ÉLECTRIQUE
Toute intervention nécessitant d’accéder à des
composants électriques non isolés doit être
effectuée par un technicien agréé usine.
N’ouvrez AUCUN panneau d’accès nécessitant
l’utilisation d’un outil. Le non-respect de cet
avertissement peut exposer à une décharge
électrique sévère.
AVERTISSEMENT :
RISQUE DE BLESSURE
Les procédures d’installation doivent être
effectuées par un technicien qualié ayant pleine
connaissance des réglementations applicables. Le
non-respect de cet avertissement peut provoquer
des blessures et des dommages matériels.
AVERTISSEMENT :
RISQUE DE CHUTE
N’utilisez PAS d’appareil de cuisson produisant
de la graisse sans que le godet à graisse soit
correctement installé. Vous risqueriez de glisser
car la graisse éclabousserait le sol.
AVERTISSEMENT :
N’essayez PAS de nettoyer le ltre ou le pré-ltre
HEPA ou à CHARBON. L’eau absorbée rendrait
le ltre inutilisable. Un ltre humide ou colmaté
provoque l’arrêt du système de ventilation. Utilisez
uniquement des pièces neuves et propres,
homologuées par Wells®. Conservez des
ltres de rechange pour éviter l’interruption du
fonctionnement.
Service clientèle : [phone].

4
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
32.52”
19.72”
29.5”
30.2”
3”
20.78”
4.8”
8”
53.30”
31.1”
31”
56.7”
5” 8” 18”
IL2734
CLEARANCES

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
5
FIRE SUPPRESSION SYSTEM
ELECTRIC & ANSUL
KNOCK-OUTS
(3 SIDES)
THERMAL
DETECTORS
(2 PLACES)
NOZZELS
(5 TOTAL)
CUSTOMER
ANSUL HOOK-UP
IL2740
Fire Suppression System Installation
It is required that this unit be protected by a UL listed re suppression
system, provided by the customer. The nal installation, testing and
certication of the system is the responsibility of the customer and MUST
be performed by a qualied Fire Protection Agent in accordance with the
hood system.
This Wells Ventless System includes factory installed piping, plenum,
discharge nozzles, thermal detectors.
DANGER
FIRE HAZARD
Fire suppression system
must be charged and certied
by an authorized Ansul®
distributor.
DO NOT attempt to modify or
bypass the re suppression
system.
An uncontrolled re can
cause serious injury or death.
NOTE:
If the re suppression system
is discharged, a buzzer will
sound continuously. The unit
will remain inoperable until
the re suppression system is
serviced, recharged and reset
by an authorized Ansul®
distributor.
Charging of the Ansul®
Fire Suppression system
must be in accordance with
Ansul® Design, Installation,
Recharge and Maintenance
Manual, #418087.
NOTE:
If a REMOTE MANUAL PULL
STATION is installed, moving
the ventilator for any reason
may cause the Ansul®
system to discharge.
IMPORTANT:
Should the re suppression
system discharge: all nozzles
must be replaced, and all
lines thoroughly cleaned,
prior to recharging the
system.
Residual re suppression
media may compromise the
ow and dispersion of re
suppression media in any
subsequent activation.

6
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
FEATURES & OPERATING CONTROLS
4
11
5
84
10
9
12
13
19
18
11
1
765
1
14 15
3
3
17
21
IL2735
Countertop Ventilator Section Operating Features & Controls

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
7
FEATURES & OPERATING CONTROLS continued
FEATURES & OPERATION CONTROLS
ITEM NO DESCRIPTION COMMENT
1 DISCHARGE NOZZLES Fire suppression media discharges here, (5 places)
2 VENTILATOR FAN Provides air movement for ventilation
3 DETECTION END OF LINE RELAY Prevents appliance operation if a fault is found in detection circuit.
4 VENTILATOR EXHAUST DUCT, FRONT Exit point for ventilator airow - on front of unit. DO NOT BLOCK
5FILTER INTERLOCK SWITCHES Proper installation of bafe lter and lter pack closes these switches
in ventilator sensor circuit
6HI-EFFICIENCY/CHARCOAL FILTER PACK Removes grease and smoke particles. Also assists in cooking odor
removal.
7 PRE-FILTER Replaceable PRE-FILTER, stops large particles of grease from
reaching the FILTER PACK for reduced maintenance costs.
8 ELECTRICAL DETECTORS
Designed to activate at a certain temperature. Activates (i.e. re on
the cooktop) activates re suppression system. Should be checked
every 6 months during ANSUL® Service Inspection
9 PRE-FILTER SWITCH Monititors the Pre-Filter and indicates when it needs replacing, if
ignored it will lead to unit shut down.
10 EQUIPMENT INTERFACE CONTACTOR Energizes cooking appliances only while ventilator section is sensed
as operational.
11 HEPA FILTER SWITCH Montitors the HEPA lter and indicates when it needs replacing, if
ignored it will lead to unit shut down.
12 SUPPLY CONNECTION TERMINAL BLOCK Provides connection point for electrical circuitry
13 UNIT SHUT-DOWN SWITCH Shuts down the unit and appliances when the lack of air ow reaches
a certain level, triggers a service unit indicator.
14 GREASE DRIP TRAY Collects grease/moisture dripping from bafe lter (16)
15 BAFFLE FILTER Extracts and drains most greases and moisture from the air ow.
16 APPLIANCE LIGHT (Not Shown) ON when hood power switch is ON. Illuminates cooking area.
17 120V TRANSFORMER Provides power to appliance lights
18 120V TRANSFORMER Provides power to contactor relay
19 BUILDING ALARM RELAY Provides electrical connections for building alarm system

8
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
PRECAUTIONS AND GENERAL INFORMATION
This ventilator hood is part of an engineered system and is intended for
use in commercial establishments only.
This ventilator is intended for commercial establishments for use
in the preparation food for human consumption. No other use is
recommended or authorized by the manufacturer or its agents.
Operators of this appliance must be familiar with the appliance use,
limitations and associated restrictions. Operating instructions must be
read and understood by all persons using or installing this appliance.
This ventilator hood system is designed to reduce odor emissions,
but will not completely eliminate all cooking odors. Air exchange
rates at the installation site must comply with the requirements of the
local jurisdictional authority. To ensure that odors do not accumulate,
recommended minimum air exchange is 200 cfm per linear foot of hood
into and out of the site.
This unit is intended for use with light- and medium duty electric
cooking appliances only. Cooking appliances placed under this
ventilator must comply with the restrictions set forth in the Installation
section of this manual.
Do not connect or energize this appliance until all installation
instructions are read and understood. Property damage or bodily
injury may result if these instructions are not followed. Disconnect this
appliance from electrical power before performing any maintenance or
servicing.
Cleanliness of this appliance is essential to good sanitation. Read and
follow all included cleaning instructions and schedules to ensure the
safety of the food product.
This appliance is not jet steam approved. Do not direct water jet or
steam jet at this appliance, or at any control panel or wiring.
Do not splash or pour water on, in or over any controls, control panel or
wiring. Do not attempt to wash lter packs. Water will cause their
immediate failure and disable the ventilator.
Exposed surfaces of this appliance can be hot to the touch and may
cause burns.
Avoid storing ammable or combustible materials in, on or near the
ventilator or associated cooking appliance.
The technical content of this manual, including any wiring diagrams,
schematics, parts breakdown illustrations and/or adjustment
procedures, is intended for use by qualied technical personnel.
Any procedure which requires the use of tools must be performed by a
qualied technician.
All supplied instructions, diagrams, schematics, parts breakdown
illustrations, notices and labels must remain with the appliance if the
unit is sold or moved to another location.
This appliance is made in the USA. Unless otherwise noted, this
appliance has American sizes on all hardware.
DANGER:
SUFFOCATION HAZARD
Do not attempt to use this
ventilator with gas-red units.
This ventilator will not remove
products of combustion.
Unvented exhaust gasses
can be deadly.
WARNING:
SHOCK HAZARD
All servicing requiring
access to non-insulated
electrical components must
be performed by a factory
authorized technician.
DO NOT open any access
panel which requires the use
of tools. Failure to follow this
warning can result in severe
electrical shock.
IMPORTANT:
The ventilator is disabled
when the lters are plugged
to the point of insufcient
airow for proper operation.
Also, power to the cooking
appliances is interrupted if
any lters or service panel
are removed.
It is the responsibility of
the store management to
maintain sufcient spares
of lter packs to avoid
prolonged shutdown due
to a dirty or clogged lter
pack. Filter packs cannot be
cleaned.
Wells Manufacturing
assumes no liability for loss
of business due to a lter
related shutdown. Spare
lters can be purchased
from any authorized Wells
servicer or calling Wells.

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
9
AGENCY LISTING INFORMATION
INSTALLATION
NOTE: DO NOT discard
the carton or other packing
materials until you have
inspected the appliance for
hidden damage and tested it
for proper operation.
Refer to SHIPPING DAMAGE
CLAIM PROCEDURE on the
inside front cover of this
manual.
WARNING:
Risk of injury
Installation procedures must
be performed by a qualied
technician with full knowledge
of all applicable electrical
codes. Failure can result in
personal injury and property
damage.
IMPORTANT:
Fire suppression system must
be charged and certied by an
authorized Ansul® distributor.
Ventilator will not operate and
cooking appliance will not be
energized until the Ansul® re
suppression system has been
charged.
IMPORTANT:
After cooking appliances
are positioned under the
hood, swivel nozzles must
be positioned per Ansul®
recommendations.
UNPACKING & INSPECTION
Carefully remove the appliance from the carton. Remove all
protective plastic lm, packing materials and accessories from the
appliance before connecting electrical power or otherwise performing
any installation procedure.
Carefully read all instructions in this manual and any other docments
packed with the appliance before starting any installation.
All documentation should remain with the equipment operator for future
reference.
Read and understand all labels and diagrams attached to the
ventilator.
Carefully account for all components and accessories before
discarding packing materials.
COMPONENTS
Pre-Filter 1 ea.
Bafe Filter 1 ea.
Filter pack 1 ea.
Grease cup 1 ea.
Ansul® components - must be supplied by customer and installed
by an authorized Ansul® distributor only:
The unit is shipped with an angled discharge grill.
To change the direction of the discharge airow:
1. Remove the discharge grill by removing the four (4) mounting
screws on the grill.
2. Rotate the discharge grill to the desired discharge position.
3. Re-Secure the grill using the four (4) mounting screws.
This appliance conforms to NSF Standard 2 for sanitation only if
installed in accordance with the supplied Installation Instructions
and operated and maintained in accordance with the instructions in this
manual.
This appliance is ETL listed.
UL710B
Recurculating System
STD 2
US

10
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
INSTALLATION (continued)
UNDER-HOOD APPLIANCE LIMITATIONS:
1. Appliance must be installed per manufactures instructions.
2. Electrical appliances only. Not Intended for gas red units.
3. All appliances under the hood must be connected to the hood appliance interlock circuit.
4. All appliances must meet the requirements outlined in the cooking appliance limitations chart below.
EQUIPMENT PARAMETER WVU-31CT
Coverage Parameters Maximum
kW / Ft
Maximum Cooking
Temperature
Maximum Single
Appliance Heated
Cooking Surface
Dim A,
Minimum
(A)
Dim B,
Minimum
(B)
Dim B,
Maximum
(B)
Appliance Type
Fryer 16.9 400°F (204°C) 24 5 12 20
Griddle 5.5 450°F (232°C) 24 5 12 20
Hotplate 5.5 N/A N/A 5 15 25
Counter Top Oven N/A 550°F (287°C) 27 4 5 N/A
Sandwich Grills 5.5 450°F (232°C) 24 5 10 25
Convection Oven N/A 550°F (287°C) 27 5 5 N/A
Micro Combi Oven N/A 550°F (287°C) 27 4 5 N/A
(A) FRONT OF HOOD TO FRONT EDGE OF HEATED
COOKING SURFACE.
(B) BOTTOM FRONT EDGE OF HOOD TO HEIGHT OF
HEATED COOKING SURACE.
The hood and all under hood appliances must be installed
in accordance with the standard for ventilation control and
re protection of commercial cooking operations NFPA
96, the national electric code NFPA 70 and all local codes
where applicable.
All under hood appliances must be controlled by the
equipment shutoff interface. Only electrically heated
appliances are acceptable for installation. Appliance
operation requires the re suppression system be setup,
charged and certied by an authorized ansul ® distributor.
The airow monitoring system will prevent appliance
operation if insufcient airow is detected or all lters are
not in place. The service panel must be in place for blower
operation.
WELLS MANUFACTURING
MODEL NO: WVU-31CT
LOWER AIR FLOW LIMIT: 375CFM
MAXIMUM MEASURED GREASE EMISSIONS: .000693 LB/HR/FT
ANSI-UL710B RECIRCULATING SYSTEM
SIDE VIEW
B
31.63
A
30.24

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
11
INSTALLATION (continued)
SERVICE TECHNICIAN INSTALLATION NOTES
This ventilator hood is to be used with light-duty and medium-duty
electrically powered cooking appliances only.
•DO NOT attempt to use this ventilator hood with gas-red units.
•DO NOT use this ventilator hood with electrical appliances whose
dimensions or wattage characteristics exceed those dened in the
Under Hood Cooking Appliance Limitations, page 10.
Installation and start up must be performed by an Authorized
Installation Company.
Ansul® Installer must complete the WARRANTY INITIATION form
(2M-303912) included with the unit for the warranty to begin, and record
installation particulars on the CUSTOMER SERVICE DATA form
located at the end of this manual.
It is the responsibility of the installer to verify that this VENTILATOR
installation is in compliance with the specications listed in this manual,
with local code requirements, and in accordance with
NFPA 96 the STANDARD FOR VENTILATION CONTROL AND FIRE
PROTECTION OF COMMERCIAL COOKING OPERATIONS.
WARNING: IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION,
SERVICE OR MAINTENANCE CAN CAUSE PROPERTY DAMAGE, INJURY
OR DEATH. READ THE INSTALLATION, OPERATION AND MAINTENANCE
INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR SERVICING
THIS EQUIPMENT.
WARNING: THIS PRODUCT IS NOT PROVIDED WITH AN INTEGRAL
FIRE EXTINGUISHING SYSTEM. AUTHORITIES HAVING JURISDICTION
SHOULD BE CONSULTED AS TO THE REQUIREMENT FOR THIS
EQUIPMENT WITH RESPECT TO FIRE EXTINGUISHING SYSTEMS, SUCH
AS THE NEED FOR FIELD INSTALLED SYSTEMS IN ACCORDANCE WITH
NFPA 96.
DANGER:
SUFFOCATION HAZARD
Do not attempt to use this
ventilator with gas-red units.
This ventilator will not remove
products of combustion.
Unvented exhaust gasses
can be deadly.
WARNING:
SHOCK HAZARD
All servicing requiring
access to non-insulated
electrical components must
be performed by a factory
authorized technician.
DO NOT open any access
panel which requires the use
of tools. Failure to follow this
warning can result in severe
electrical shock.
CAUTION:
RISK OF
DAMAGE
DO NOT connect or energize
this appliance until all
installation instructions are
read and followed. Property
damage or bodily injury could
result if these instructions are
not followed.
IMPORTANT:
If a remote pull station is to
be used, ventilator cannot be
moved without rst disabling
the remote pull station.
Contact your Ansul® agent
for details.

12
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
INSTALLATION (continued)
Site Preparation
1. Provide clearance around installation site to safety lift equipment
into its nal position. Consider general service and installation
space when locating unit.
2. Thoroughly review the plans and specication of the project.
3. Determine the exact location in which the cooking hood will be
installed and verify that there are no interferences, which will
prevent proper installation. There should be a necessary amount
of space above the hood for proper air discharge.
4. This unit is designed to sit on a permanent level counter, at no
time should this unit be in operation on a movable cart. Ensure
the site is capable of supporting both the hood’s weight as well as
the appliance.
5. Determine if adequate room is available to install the hood with
proper clearance from combustible material. IMC, NFPA96 and
local authorities having jurisdiction call for a minimum clearance
(typically 18 inches) between the cooking hood(s) and building
materials, which are combustible. However, IMC and NFPA96
outline acceptable clearance reduction methods. It is important to
check with the local authority having jurisdiction to determine that
the installation method is satisfactory to meet their requirements
prior to installing the equipment.

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
13
INSTALLATION (continued)
MECHANICAL INSTALLATION
The following is a step-by-step procedure for installation of the Recirculating Hoods.
1. Uncrate the hood, being very careful not to dent or scratch the outer surface. NOTE: Report any
damage to the delivering freight carrier and le a claim if appropriate. Check the nameplate on the
equipment to make certain it meets the specications provided by the architect and or engineer. If
discrepancies exist, notify the manufacturer immediately.
2. It’s important that you have read and understand “Site Preparation” before continuing with the installation
of the hood. See Table on page 8 “EQUIPMENT PARAMETER”.
3. Determine the exact location of the hood.
4. Raise the hood into position using high lifts or equipment jacks.
5. Once the hood is in position, check to ensure the hood is level and stable.
6. Apply a bead of food grade silicone sealant to the entire perimeter of the hood base to the counter
top. A liquid tight seal must be made between the hood base and the counter top.
7. A 5/16 inch hole is located on the rear of the unit if a tether devise (NOT SUPPLIED) is required.
a) Remove the plug by prying the plug out of the hole.
b) Install tether device.
Electrical Knock-out
On each wall of the enclosure is a grouping of
electrical connection knock outs. Each grouping
consists of four (4) individual knock outs.
They are:
- 2 of diameter 0.875 inch to allow use of a ½
inch trade size cable connector.
- 1 of diameter 1.984 inch to allow use of a 1
½ inch trade size cable connector.
- 1 of a 3.8 inch by 3.8 inch knock out with
two .177 diameter holes to allow use of a
standard 4 inch by 4 inch electrical junction
box.
Knock outs are also located on three (3) sides
of the top panel. These knock outs are sized to
accept a ½ inch trade size connection clamp.
IMPORTANT
Any appliance connection mounted to any
of the enclosure wall knock outs MUST be
sealed to the wall with high temperature
silicone sealant.
IL2749
Food Grade
Silicone
Electrical
Knock-Outs
(Qty 3)
Tether Device
(not supplied)

14
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
ELECTRICAL INSTALLATION
Refer to the nameplate on the ventilator. Verify ELECTRICAL
SERVICE POWER. Voltage and phase must match the nameplate
specications, and available electrical service amperage must meet or
exceed the listed amperage. Refer to specications listed on page 1 of
this manual.
The ground lug of this ventilator must be connected to a suitable
building ground.
Open the front control panel to access the cooking appliance contactor.
Wire the cooking appliance control circuit to the terminal block per the
gure below.
NOTE: It is the responsibility of the electrical contractor to provide
suitable wiring, exible or rigid conduit, and an appropriate strain relief.
Electrical Connection
NOTE: The hood requres a single phase (1ph), 208 or 240 volt, 15
amp suppy. When connecting line voltage to the unit’s terminal block,
use a minimum of #12 gage copper wire only, suitable for 167°F (76°C)
ambient temperature.
Appliance Connections
All under hood appliances are required to be interlocked with the hood’s
equipment cut-off circuit, through a customer supplied contactor. This
contactor must be a UL listed, denite purpose AC resistive air heating type,
suitable for the appliance load. Installation and connections shall be in
accordance with the National Electric Code NFPA 70. These connections
provide an automatic shutdown of the appliance when the hood is OFF, or in
the event of a malfunction or appliance re.
Equipment Cutoff Connections
Opt 1: Use TB#3 & TB#4 for 208 or 240 volt control circuit. These contacts will be
de-energized when the hood is OFF or in the event of a malfunction
Opt 2: Use TB#5 & TB#6 as a Normally Closed SPST relay connection for equipment
control circuits with voltages other than 208 or 240 AC. These contacts will be
open when hood is OFF or in the event of a malfunction.
INSTALLATION
DANGER:
SUFFOCATION HAZARD
Do not attempt to use this
ventilator with gas-red units.
This ventilator will not remove
products of combustion.
Unvented exhaust gasses
can be deadly.
WARNING
SHOCK HAZARD
Electrical connections must
be made by a licensed
electrician.
CAUTION:
FIRE HAZARD
HEALTH HAZARD
All cooking appliance must
be connected to the cooking
appliance contactor, the
control circuit of which is
controlled by the ventilator.
Failure to control cooking
appliances will provide no
protection in the event of a
re, nor will cooking vapors
and odors be contained in
the event of ventilator hood
malfunction.
TB1 TB6 TB7 TB8 TB9
TB10 TB11
TB2 TB3 TB4 TB5
LINE INPUT
208-240VAC
50/60HZ
SEE NEXT PAGETO CUSTOMER
SUPPLIED
SWITCHING
DEVICE (SPST)
OPTION 2
TO CUSTOMER
SUPPLIED APPLIANCE
CONTACTOR
(240V CNTR CIRCUIT)
OPTION 1
L1 L2
IL2741
TB3
TB4
208/240V
APPLIANCE
CONTROL
EQUIPMENT
CUTOFF
TERMINALS
CUSTOMER
SUPPLIED
CONTACTOR(S)
TO APPLIANCE
OVER CURRENT
PROTECTED
SUPPLY
EQUIPMENT INTERFACE OPTION 1
SPST
SWITCHED
EQUIPMENT
CUTOFF
TERMINALS
TB5
TB6
CUSTOMER
SUPPLIED
CONTACTOR(S)
CUSTOMER
SUPPLIED
SOURCE CIRCUIT
TO APPLIANCE
OVER CURRENT
PROTECTED
SUPPLY
L3
T3
EQUIPMENT INTERFACE OPTION 2

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
15
INSTALLATION continued
The ventilator will operate properly, and the appliance control relay will
be energized, only when:
1. The VENTILATOR POWER SWITCH is “ON”.
2. The Ansul® Fire Suppression System is charged and armed.
3. All lters are in position and serviceable, and the ventilator air ow
system is satised.
DANGER
FIRE HAZARD
Fire suppression system
must be charged and certied
by an authorized Ansul®
distributor.
DO NOT attempt to modify or
bypass the re suppression
system.
An uncontrolled re can
cause serious injury or death.
NOTE:
If the re suppression system
is discharged, a buzzer will
sound continuously. The unit
will remain inoperable until
the re suppression system is
serviced, recharged and reset
by an authorized Ansul®
distributor.
Charging of the Ansul®
Fire Suppression system
must be in accordance with
Ansul® Design, Installation,
Recharge and Maintenance
Manual, #418087.
NOTE:
If a REMOTE MANUAL PULL
STATION is installed, moving
the ventilator for any reason
may cause the Ansul®
system to discharge.
IMPORTANT:
Should the re suppression
system discharge: all nozzles
must be replaced, and all
lines thoroughly cleaned,
prior to recharging the
system.
Residual re suppression
media may compromise the
ow and dispersion of re
suppression media in any
subsequent activation.
N.C.
N.O.
C
CUSTOMER SUPPLIED CONNECTIONS
AUTOMAN ELECTRIC SWITCH # 1
N.C.
N.O.
C
AUTOMAN
ELECTRIC
SWITCH
CUSTOMER SUPPLIED CONNECTIONS
AUTOMAN ELECTRIC SWITCH # 2
YL
BR
AUTOMAN
ACTUATOR
SOLENOID
TB 10
TB 11
TB 9
TB 9TB 9TB 8
TB 7
IL2742

16
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
INSTALLATION continued
DANGER
BURN HAZARD
Any additional remote pull
station must NOT be installed
on the front of the cooking
appliances,
Discharge of the re
extinguishing system into hot
grease or oil may cause hot
foam to spill over from the
cooking surface or frypot.
Serious burns and other injuries
can result from contact with hot
oil and from slipping in spilled
oil.
The manual pull station is
installed on the right side
(facing the unit. It may,
however, be relocated to the left
side of the ventilator hood by an
authorized Ansul® agent.
FIRE SUPPRESSION SYSTEM INSTALLATION
THE FIRE SUPPRESSION SYSTEM is supplied by the customer with
the exception of the piping, nozzles and thermal detectors.
The hood is not supplied with a eld installed MANUAL PULL
STATION, which must be set-up at the time of installation by an
authorized Ansul® distributor.
The MANUAL PULL STATION allows for for manual emergency
shutdown of cooking appliance power, and actuation of the re
suppression system.
Three (5) NOZZLES disperse the re suppression media. These
nozzles protect the fan, plenum, Grease Bafe, Filter and Cooking
Area.
If the ventilator is situated such that the supplied manual pull
station cannot be installed or is not readily accessible, a REMOTE
MANUAL PULL STATION may be required by local codes. Any
such remote manual pull station must be installed by an authorized
Ansul® distributor in accordance with the AUTHORITY HAVING
JURISDICTION.
The re detection system utilizes two (2) electronic thermal detector
with an actuation set point of 225°F (107°C).
The signaling from the detection devices will automatically discharge
the re suppression media through all nozzles, disable the cooking
appliances and cause the alarm to sound.
Fire supression media will form an emulsion designed to both
smother and cool the fuels in/on the cooking appliance.
The MANUAL PULL STATION and any similar REMOTE MANUAL
PULL STATION will activate the re suppression system when the
ring on the pull station is pulled to its full extent.

M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
17
INSTALLATION
NOTE:
The BAFFLE FILTERS,
PRE-FILTERS and FILTER
PACK actuate position
switches when they are
properly positioned. They
must be properly installed
for the under hood cooking
appliance contactor to be
energized.
WARNING
SLIP AND FALL
HAZARD
DO NOT operate any
grease-producing cooking
appliance unless the grease
cup is properly installed. Oil
will drip onto oor creating a
slipping hazard.
CAUTION
BURN HAZARD
DO NOT operate any cooking
appliance unless the grease
cup is installed.
Moisture dripping onto hot
surfaces, oil or grease can
cause splattering.
WARNING
CLEAN FILTERS
DO NOT attempt to wash the
HEPA / charcoal iter pack or
pre-lter. Water absorbtion
will render the lter unusable.
Use of a wet or clogged lter
will cause the ventilation
system to shut down. Use
only clean Wells®Authorized
Service Parts. Keep spare
lter packs on hand to avoid
distruptions. Wells Parts
Department [phone].
FILTER INSTALLATION
Note air ow direction arrow on lter pack. Remove old lter pack
and slide new lter pack fully into the appropriate slot. Verify that
the airow arrow points toward the fan.
The baffe lter is reusable and should be cleaned at least weekly.
Change the pre-lter and Hepa lter pack as indicated on the front
panel. These lters are disposable and cannot be reusable. All lters
are accessible throught the front service door.
Use only genuine Wells replacement parts and lters,
call [phone] or your authorized Wells service agent. Parts
supplied by others will void your warranty and may not provide safe
operation.
BAFFLE FILTER and GREASE CUP INSTALLATION
1. Install bafe lter from front. Engage the bafe lter in the retainer
slot. Push up until the bafe lter bottom clears the lower lip of the
retainer, then lower the bafe lter into the bottom retainer
2. Install GREASE CUP into brackets below the bafe lter.
Note: Failure to install the GREASE CUP will allow grease and
moisture from the BAFFLE FILTER to drop into hot cooking surfaces,
creating both a SAFETY HAZARD (hot oil splatter).
HEPA FILTER
PRE-FILTER
BAFFLE-FILTER
IL2738

18
M524 p/n 2M-Z17951 OpM WVU- Countertop Universal Hood
OPERATION
Control Panel
NOTE: Cooking appliances must be operated in accordance with the
manufacturer’s instructions.
During normal operation, the illuminated power switch will be the only
light on the control panel that will be ON.
If the CHECK FILTERS light illuminates, check BAFFLE FILTERS,
PREFILTERS, and the HEPA AIR FILTERS for proper installation.
If the REPLACE PRE-FILTERS light illuminates .. Replace the Pre-lters.
If the REPLACE FILTER PACK light illuminates, replace the FILTER
PACK.
NOTE: the REPLACE FILTERS PACK light is a warning that lter pack is
nearing the end of its service life. The ventilator will continue to operate
for a period of time after the REPLACE FILTER PACK LIGHT turns ON
to allow continued operation through a peak period. However, lter pack
must be replaced within a short time period or it will clog, disabling the
ventilator and appliances.
If the SERVICE REQUIRED light illuminates, the lter pack is restricted
to the point of insufcient airow for proper operation and the Ventilator
will shut down until the underlying clogged lter situation has been
corrected. Replace clogged item with a fresh lter to correct the
condition.
Reset the unit by turning VENTILATOR POWER SWITCH to OFF,
then back to ON.
A failure of incoming electric power will cause a shut down of the unit.
Reset the unit by turning VENTILATOR POWER SWITCH to OFF, then
back to ON.
Operation Lights
There are two equipment lights that provide illumination of the working
area. These lights are controllled by the main power switch.
CAUTION:
HOT SURFACE
Exposed surfaces can be hot
to the touch and may cause
burns.
CAUTION:
SHOCK HAZARD
DO NOT splash or pour water
or grease onto control panel
or wiring.
IMPORTANT:
The ventilator cannot operate
if the lter pack is removed or
clogged.
It is the responsibility of
the store management to
maintain sufcient spares
of lter packs to avoid
prolonged shutdown of the
ventilator when this lter is
expended.
Filter packs cannot be
cleaned.
Wells Manufacturing assumes
no liability for loss of business
due to lter related shutdown.
Filters that are not genuine
Wells Replacement Parts
may cause your unit to
operate incorrectly and you
will risk the possibility of
voiding your warranty.
SERVICE
REQUIRED
REPLACE
FILTER PACK
REPLACE
PREFILTER
CHECK
FILTER
ON
POWER
OFF
IL2736