Wells WV-4HF Operating instructions

IMPORTANT: WELLS BLOOMFIELD, LLC PROPRIETARY INFORMATION.
DISSEMINATION OF THIS INFORMATION TO ANYONE OTHER THAN
WELLS AUTHORIZED SERVICE AGENTS IS STRICTLY PROHIBITED.
TECHNICAL CONTENT OF THIS MANUAL IS DESIGNED FOR
USE BY QUALIFIED PROFESSIONALTECHNICIANS ONLY.
PRINTED IN UNITED STATES OF AMERICA
WELLS BLOOMFIELD, LLC
2 ERIK CIRCLE, P. O. Box 280 Verdi, NV 89439
telephone: [phone]
fax: [phone]
www.wellsbloomfield.com
p/n SV504 Rev.(-) S504 080519 cps
504
SUPPLEMENTAL
SERVICE
INSTRUCTIONS
WV-4HF
WV-4HFRW
WV-4HS
WV-4HSRW
ELECTRIC 4-BURNER
HOTPLATE
with
VENTLESS
HOOD
SYSTEM

GENERAL
This appliance is intended for use in commercial establishments
only.
This appliance is intended to prepare 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.
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.
Disconnect this appliance from electrical power before performing any
maintenance or servicing.
DO NOT splash or pour water on, in or over any controls, control
panel or wiring.
The technical content of this manual, including any wiring diagrams,
schematics, parts breakdown illustrations and/or adjustment
procedures, is intended for use by qualified technical personnel.
Any procedure which requires the use of tools must be performed by a
qualified technician. All service to the fire suppression system must be
performed by an authorized Ansul® agency.
This appliance is made in the USA. Unless otherwise noted, this
appliance has American sizes on all hardware.
IMPORTANT INSTALLATION NOTE:
6” clearance is required from back and sides of the appliance to any
combustible or non-combustible surface.
This installation requires a minimum ceiling height of 96" in order to
maintain adequate airflow.
WARNING:
RISK OF
INJURY
Installation procedures must
be performed by a qualified
technician with full knowledge
of all applicable electrical and
plumbing codes. Failure can
result in personal injury and
property damage.
WARNING:
ELECTRIC
SHOCK HAZARD
All servicing requiring access
to non-insulated electrical
components must be
performed by a qualified
technician.
Some procedures involve
exposed live circuits. Use all
due caution to avoid contact
with live electric circuits.
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. Damage to
the appliance will result if
these instructions are not
followed.
PRECAUTIONS AND GENERAL INFORMATION
xi
SV504 SvcManual WV-4H(RW)

GENERAL
GENERAL
Precautions & General Information …………….………… xi
Specifications ..……………………………...................….. 1
Features & Operating Controls ……………………………. 2
VENTILATOR HOOD SECTION
Filter Arrangement .......................................................... 6
Service Indicator Lights .…….......................................… 7
Operational Notes ........................................................... 8
Filter System ................................................................... 10
Vacuum System .............................................................. 11
Ansul® System ............................................................... 12
Troubleshooting Suggestions ……………………………… 14
COOKTOP SECTION
Element Replacement ..................................................... 16
Troubleshooting Suggestions .......................................... 16
DRAWER WARMER SECTION
Operational Notes ............................................................. 18
RWT-Style Controller ....................................................... 19
Troubleshooting Suggestions ........................................... 20
EXPLODED VIEWS AND PARTS LISTS
Ansul® Components ......................................................... 21
Hood Section .................................................................... 22
Hotplate Section ............................................................... 24
Drawer Warmer Section ................................................... 25
WIRING DIAGRAMS & SCHEMATICS ............................... 26
OTHER DOCUMENTS
Material Safety Data Sheet—Ansulex Low pH ................. 32
Maintenance Logs ............................................................ 34
This manual contains information needed to properly service and repair Wells Bloomfield free-standing
four-burner electric hotplate with ventless hood system.
This manual applies to the following Wells Manufacturing models:
WV-4HF, WV-4HFRW and WV-4HFRWT
WV-4HS, WV-4HSRW and WV-4HSRWT
For installation, operation and maintenance instructions, refer to Operation Manual p/n 303903.
TABLE OF CONTENTS
INTRODUCTION
1
SPECIFICATIONS
SV504 SvcManual WV-4H(RW)
MODEL DRAWER
WARMER VOLTS 60Hz
3ø AMPS 1ø
AMPS WATTS DIMENSIONS
L1 L2 L3
WV-4HF NO 208V 16 15 26 30 6,300
30-1/4" Wide
(42-1/4" incl. spacers)
77-1/4" High
35-1/2" Deep
240V 18 17 30 35 8,300
WV-4HFRW
WV-4HFRWT YES 208V 19 15 30 34 7,000
240V 27 22 43 48 11,600
WV-4HS NO 208V 20 19 34 39 8,100
240V 23 22 39 45 10,700
WV-4HSRW
WV-4HSRWT 208V 19 15 30 34 7,000
240V 22 17 34 38 9,200
YES

GENERAL
FEATURES & OPERATING CONTROLS
Fig. 1 Ventilator Section Operating Features & Controls
2
SV504 SvcManual WV-4H(RW)
56
28
19
16
18
23
98
a15
a11
53
12 41
44
4243
40
a6
a31
38
18 16
22
23
VENTILATOR CONTROL PANEL
see pages 4 & 5
COOKTOP CONTROL PANEL
see pages 4 & 5
WARMER CONTROLS
see pages 4 & 5
a10
70
38

GENERAL
FEATURES & OPERATING CONTROLS (continued)
3
SV504 SvcManual WV-4H(RW)
ITEM
a6.
8.
9.
a10.
a11.
12.
a15.
16.
18.
19.
22.
23.
28.
a31.
38.
40.
41.
42.
43.
44.
56.
70.
DESCRIPTION
FIRE SUPPRESSION
AGENT TANK (1.5 gal.)
ADJUSTABLE (FRONT)
LEG
RIGID (REAR) CASTER
MANUAL PULL STATION
FUSIBLE LINKS
LOWER REAR ACCESS
PANEL
DISCHARGE NOZZLE
GREASE BAFFLE
PRE-FILTER ASSEMBLY
HEPA/CHARCOAL FILTER
PACK
GREASE CUP
GREASE TROUGH
VENTILATOR EXHAUST
DUCT
STATUS INDICATOR
POWER CORD
WARMER RELAY
POWER CONTACTOR
BUILDING FIRE ALARM
RELAY
GROUND LUG
INTERLOCK TERMINAL
VENTILATOR FAN
COOLING FAN
COMMENT
Container for Ansulex™ Low-pH liquid fire suppression liquid.
Allows the unit to be leveled.
Allows the unit to be easily positioned by lifting the front of the
unit slightly.
Provides a means of manual activation of the fire suppression
system. PULL ONLY IN CASE OF FIRE!
Automatically activates fire suppression system in the event of
fire on the cooktop.
Allows access to Ansul® fire suppression agent tank (a6) and
controls also access to main power contactor (41).
Fire suppression media discharges here (2 places).
Extracts and drains most grease and moisture from the air flow.
Comprises the PRE-FILTER FRAME and a replaceable
PRE-FILTER. Stops larger particles of grease from
reaching the FILTER PACK for reduced maintenance
costs.
Stops most grease and smoke particles. Also assists in some
cooking odor removal.
Collects grease/moisture drained from grease trough (23).
Directs grease/moisture removed by grease baffle to grease
cup.
Exit point for ventilator airflow - on top left rear of unit.
DO NOT BLOCK
Displays status of fire suppression system (COCKED - FIRED)
If FIRED, a buzzer will sound continuously.
6’ cord and cap. Plug for NEMA 15-60R (receptacle by user).
Provides power to roll warmer section. Energized at all times
except during fire safety shut-down.
Energizes cooktop only while ventilator section is sensed as
operational.
Reports fire alarm condition to building fire management
system.
Ground wire of power cord connects here.
Provides connection for shut-down control by building fire
management system.
Provides air movement for ventilation.
Provides cooling for cooktop controls.
VENTILATOR SECTION

GENERAL
FEATURES & OPERATING CONTROLS (continued)
4
SV504 SvcManual WV-4H(RW)
Fig. 2 Ventilator Section Controls & Indicator Lights
Fig. 4 Cooktop & Warmer Drawer Operating Features & Controls
Fig. 3 Cooktop Section Controls & Indicator Lights
V1 V2 V3 V4 V5 V6
H1 H2 H3 H4
H5H5H5
H5
ROLL WARMER
HUMITROL
RACK
DRAWER
INSERT
PAN
HOTPLATECOOKTOP
SPIRAL
HEATING
ELEMENT
DRIP PAN
HEATING ELEMENT
(ROTATED)
ELEMENTSUPPORT
FRONT
SOLID
PLATE
HEATING
ELEMENT
FRONT
W1
W3
W4 W2
W5
W6
RWT-STYLE
RW-STYLE

GENERAL
FEATURES & OPERATING CONTROLS (continued)
5
SV504 SvcManual WV-4H(RW)
ITEM
V1
V2
V3
V4*
V5*
V6*
H1
H2
H3
H4
H5
H6
W1
W2
W3
W4
W5
W6
DESCRIPTION
POWER SWITCH
POWER ON INDICATOR
CHECK FILTERS ALARM
INDICATOR
REPLACE PREFILTER
ALARM INDICATOR
REPLACE FILTER PACK
ALARM INDICATOR
SERVICE REQUIRED
ALARM INDICATOR
LEFT FRONT HOTPLATE
CONTROL
LEFT REAR HOTPLATE
CONTROL
RIGHT REAR HOTPLATE
CONTROL
RIGHT FRONT HOTPLATE
CONTROL
POWER ON INDICATOR
HOT SURFACE
INDICATOR
WARMER TEMPERATURE
CONTROL
POWER ON INDICATOR
THERMOMETER
(OPTIONAL )
HUMIDITY CONTROL
POWER SWITCH
CONTROL MODULE
COMMENT
Energizes blower motor. If, after 10 seconds, proper
conditions are met, cooktop is energized.
GREEN. Glows when POWER switch is ON.
AMBER. Glows if one or more filters are out of position. Check
all filters and baffles for proper installation.
AMBER. Glows when PREFILTER is approaching the end of its
service life and must soon be replaced.
AMBER. Glows when FILTER PACK is approaching the end of
its service life and must soon be replaced.
RED. Glows when PREFILTER and/or FILTER PACK has
reached the end of its service life and is too loaded to allow
sufficient air flow. Filter MUST be replaced. Appliance is SHUT
DOWN until expended filters are replaced.
Infinite switch control of temperature of one hotplate section.
Infinite switch control of temperature of one hotplate section.
Infinite switch control of temperature of one hotplate section.
Infinite switch control of temperature of one hotplate section.
AMBER. Glows when associated temperature control is turned
ON.
RED. Glows any time surface is above 150ºF
Infinite switch control of temperature of one warmer drawer.
AMBER. Glows when associated temperature control is turned
ON.
Shows temperature in warmer drawer. Must be ordered at time
of initial equipment build.
Slide control of shutters to control air circulation within the
warmer drawer.
Energize an individual warmer drawer.
Adjust setopint, view setopint and cavity temperatures.
COOKTOP SECTION CONTROLS
OPTIONAL WARMER SECTION CONTROLS
VENTILATOR SECTION CONTROLS

VENTILATOR HOOD
HOOD SECTION - FILTER ARRANGEMENT
6
FILTER
RAIL
FILTER
HOOK
FILTER PACK
PRE-FILTER
ASSEMBLY
GREASE
BAFFLE
GREASE
TROUGH
AIR FLOW
HOLDER CLIP
FILTER PACK
POSITION
SWITCH
GREASE BAFFLE
POSITION
SWITCH
FILTER PACK
SEAL
PRE-FILTER
NOTE: AIR FLOW ARROW
POINTS AWAY FROM
INSTALLER WHEN
PROPERLY INSTALLED
FILTER
FRAME
NOTE: PRE-FILTER IS SENSED
AS BEING IN POSITION BY THE
PRESSURE DROP ACROSS IT.
FILTER HOOK
FILTER
HANDLE
FILTER PACK
HOLDERCLIP
CLIPS ONTO
LEDGE
WALL OF UNIT
PRE-FILTER
FAN
SV504 SvcManual WV-4H(RW)

VENTILATOR HOOD
HOOD SECTION - SERVICE INDICATOR LIGHTS
7
POWER SWITCH
Energizes the ventilator section. When all three
filters are sensed as being in their proper position,
and sufficient airflow is proven, the cooking
appliance contactor is energized.
INDICATOR LIGHT
(GREEN) VENTILATOR
POWER ON
When lit, indicates that electrical power is available,
and that the power switch (V.01) is turned ON.
INDICATOR LIGHT (AMBER) CHECK
FILTERS (POSITION)
When lit, indicates that the BAFFLE, PRE-FILTER
and/or FILTER PACK is not in its proper position,
or that an interlock switch is out of adjustment.
Controlled by: Plunger switches position monitors
for Filter Pack and Grease Baffle; and, vacuum
switch S3 for Pre-Filter.
INDICATOR LIGHT (AMBER) REPLACE
PREFILTER
When lit, indicates that the pre-filter is approaching
the end of its service life.
ALWAYS HAVE A SPARE PRE-FILTER ON
HAND FOR QUICK REPLACEMENT.
Controlled by vacuum switch S1.
INDICATOR LIGHT (AMBER) REPLACE
FILTER PACK
When lit, indicates that the filter pack is approaching
the end of its service life.
REPLACE FILTER PACK PROMPTLY!
Controlled by vacuum switch S2.
INDICATOR LIGHT (RED) SERVICE
REQUIRED
Indicates that either the pre-filter or the filter pack is
individually clogged (the individual indicator light
may be lit), or that the the airflow drop across both
filters is critical. As a cost saving measure, always
change a dirty pre-filter first (when lights V.04 &
V.05 are not lit, and red light V.06 is on).
Note: Power to the cooking appliance will be
de-energized whenever this RED “SERVICE
REQUIRED” indicator light is lit. When lit, the air
flow is insufficient to meet appliance vapor capture
levels requirements.
Controlled by vacuum switch S4.
SV504 SvcManual WV-4H(RW)

VENTILATOR HOOD
REPLACE PREFILTER and REPLACE FILTER PACK indicator lights
provide a timely warning that a system shut-down is imminent. The
actual time between the indicator light coming on and the loss of
cooking appliance power will depend upon the cooking conditions.
Anytime a dirty PRE-FILTER is replaced, the system airflow will
increase. If the condition of the FILTER PACK is marginal, the
REPLACE FILTER PACK light could then come on. If this happens, a
fresh FILTER PACK must be installed within a reasonably short time.
Loss of airflow through the old filter pack will soon cause a system
shut-down when the airflow falls below minimum vapor capture levels.
KEEP A SPARE FILTER PACK ON HAND.
IMPORTANT: If you decide to “get the most” out of the old filter pack,
and continue to use it until a system shut-down happens, it is advisable
to have a fresh filter pack readily at hand, and have someone available
who is capable of replacing it. Otherwise, you may experience an
extended down time, with consequent associated loss of business.
The manufacturer assumes no liability for loss of business due to
a system shutdown caused by a dirty pre-filter and/or filter pack
(i.e. red SERVICE REQUIRED light is on), when the user fails to
have the proper replacement pre-filter and/or filter pack on hand.
WARNING:
FIRE AND HEALTH
HAZARDS
DO NOT bypass or attempt to
bypass the filter placement
interlocks. Operating the
appliance without filters properly
in place will compromise the fire
protection and air filtration
capabilities of this unit.
Serious personal injury and/or
substantial property damage may
result.
NOTICE:
Operating without all filters
properly in place, and/or
operating with filter placement
interlocks defeated will void the
manufacturer’s warranty.
IMPORTANT:
NEVER wash the PREFILTER or
FILTER PACK.This will shut
down the cooking appliance.
(Red “SERVICE REQUIRED”
light will turn ON).
HOOD SECTION - OPERATIONAL NOTES
8
SV504 SvcManual WV-4H(RW)

VENTILATOR HOOD
9
SV504 SvcManual WV-4H(RW)
HOOD SECTION - OPERATIONAL NOTES (continued)
FIRE DAMPER INSTRUCTIONS
1. The FIRE DAMPER is accessible by removing the TOP PANEL
The FIRE DAMPER sets in the DAMPER SUPPORT and may be
removed by lifting straight up.
2. The FIRE DAMPER normally needs no maintenance. If it
becomes heavily contaminated with dust and/or grease, it must
be replaced.
3. If the FIRE DAMPER malfunctions or if the fusible link releases,
the manufacturer recommends that the entire FIRE DAMPER
ASSEMBLY be replaced.
4. Reinstall the FIRE DAMPER with the “THIS SIDE UP FOR
HORIZONTAL MOUNTING” arrow pointing away from the
BLOWER.
IMPORTANT:
Replace the entire fire damper
assembly if the link trips, or if the
damper mechanism becomes
heavily contaminated with dust
and/or grease.
While the fusible link alone may be
replaced, once the damper has
tripped it may no longer function
reliably.
Contact factory for pricing and
availability.
LABEL
SHUTTER
FUSIBLE LINK
280ºF
ACCESS DOOR
THIS SIDE
THIS SIDE UP
FOR HORIZONTAL
MOUNTING
¬ ®
AIR FLOW
THIS
SIDE UP
FOR VERTICAL
MOUNTING
FIRE
DAMPER
DAMPER
SUPPORT

VENTILATOR HOOD
HOOD SECTION - FILTER SYSTEM
10
NOTE:
Change the pre-filter as
soon as the "REPLACE
PRE-FILTER" indicator
glows in order to extend the
service life of the filter pack.
NOTE:
The charcoal portion of the
filter pack is an aid in
controlling cooking odors
only. It will not completely
eliminate such odors.
1. The GREASE BAFFLE separates grease particles and water vapor
from the air stream by the centrifugal force of the air moving through
its inter-leaved baffle plates. Ejecta is collected in the GREASE CUP
through drain holes in the baffle frame and cabinet.
The GREASE BAFFLE POSITION MONITOR plunger switch controls
electric power to the ventilator fan.
2. The PRE-FILTER is composed of a replaceable media filter and a
filter-retaining gage. The pre-filter captures the bulk of grease vapors.
Pre-filter position is monitored by a vacuum switch, which is in the
control circuit of the cooking appliance contactor.
3. The FILTER PACK is composed of a high-efficiency filter to capture
grease vapors down to a very small particle size; and, an activated
charcoal filter to help control cooking odors.
The FILTER PACK POSITION MONITOR plunger switch is in the
control circuit of the cooking appliance contactor.
SV504 SvcManual WV-4H(RW)
FILTER PACK
POSITION MONITOR
GREASE BAFFLE
POSITION MONITOR
HOOD ASSEMBLY
(LOOKING UP)
NOTE AIR FLOW ARROWS ON
GREASE BAFFLE, PRE-FILTER
AND FILTER PACK. INSTALL
THESE COMPONENTS SUCH
THAT ARROWS POINT
TOWARD FAN
FILTER
PACK
PRE-FILTER
ASSEMBLY
GREASE
BAFFLE

VENTILATOR HOOD
HOOD SECTION - VACUUM SYSTEM
11
SV504 SvcManual WV-4H(RW)
SWITCH FUNCTION
VS1 PRE-FILTER POSITION MONITOR
Unit will not function unless a pre-filter
is properly installed, as sensed by the
pressure drop across it. Pressure drop
across the pre-filter must exceed setting
before cooking appliance is energized.
Insufficient pressure drop will illuminate
"CHECK FILTER" indicator.
VS2 FILTER PACK ALERT
Will illuminate "REPLACE FILTER PACK"
indicator if pressure drop across the filter
pack exceeds setting.
VS3 PRE-FILTER ALERT
Will illuminate "REPLACE PRE-FILTER"
indicator if pressure drop across the pre-
filter exceeds setting.
VS4 AIR FLOW MONITOR
Pressure drop must exceed setting before
cooking appliance is energized. As filters
become plugged, airflow decreases.
Beyond the useful life of the filters, air flow
will be insufficient to maintain the required
pressure drop, which will shut-down
ventilator fan and cooking appliance and
illuminate "SERVICE REQUIRED"
indicator.
IMPORTANT:
Vacuum switch settings are factory set, and are not
adjustable.
PLENUM PORT
(AFTER FILTER PACK)
CABINET PORT
(BEFORE FILTER PACK)
FAN
PORT A
PORT B
PORT B
PORT C
PORT C
PORT C
PORT A
VS1
VS2
VS4
VS3
FAN
GREASE
BAFFLE
PRE-
FILTER
FILTER
PACK FAN
AMBIENT
PRESSURE
PRESSURE
DROP ACROSS
BAFFLE
PRESSURE
DROP ACROSS
PRE-FILTER
PRESSURE
DROP ACROSS
FILTER PACK
PRESSURE
RISE FROM
FAN
AIR FLOW
SWITCH
VS1
SWITCH
VS2
SWITCH
VS4
SWITCH
VS3

VENTILATOR HOOD
HOOD SECTION - ANSUL® FIRE DETECTION SYSTEM
12
IMPORTANT:
All servicing of the fire
detection system to be
performed by an
authorized Ansul® agent
only.
1. Cooking appliance protected by two 212ºF fusible links connected
in series. Fuse links are located in the plenum at the entry to the
ventilator fan.
2. Fire suppression system may be activated by the manual pull station
on the front of the unit, or by a remote manual pull station if installed.
3. A microswitch in the Ansul® Automan assembly allows connection to
a building fire alarm system.
SV504 SvcManual WV-4H(RW)
A
NS
UL
PULL
HANDLE
INCASEOF
FIRE
CABLE SITS IN
GROOVE IN
PULLEY
MANUAL
PULL STATION
PULLEY
ELBOW
212ºF
212ºF
DETECTOR
IN PLENUM
MICROSWITCH
HOOD ASSEMBLY
VIEWED FROM REAR

VENTILATOR HOOD
HOOD SECTION - ANSUL® FIRE SUPPRESSION SYSTEM
13
IMPORTANT:
All servicing of the fire
suppression system to be
performed by an
authorized Ansul® agent
only.
1. Actuation of the Ansul® system will cause the pressure cartridge seal
to be punctured, which will pressurize the 1.5 gallon media tank. Fire
suppression media will be forced through the piping where it will spray
from the various nozzles.
2. The cooking appliance surface is protected by two type 290 nozzles.
3. The plenum area between the filters and the fan is protected by a
single type 1W nozzle.
4. The pressure integrity of the plenum bulkheads is maintained by the
use of compression fittings at the piping penetrations.
5. Nozzles are protected from grease contamination by press-on silicone
rubber caps.
SV504 SvcManual WV-4H(RW)
HOODASSEMBLY
VIEWEDFROMREAR
PLENUM
NOZZLE ASSY
APPLY SEALANT TAPE
INSIDE
OUTSIDE
CABINET WALL SEAL WITH
TEFLON TAPE
SEAL WITH
TEFLON TAPE
FIBER
WASHER
IS ALWAYS
ON THE INSIDE
TYPICAL BULKHEAD
FITTING
PRESSURE
CARTRIDGE
FIRE SUPPRESSION
MEDIA TANK
NOZZLE 1W
FLEX
HOSE
APPLY SEALANT TAPE
UNDER-HOOD
MANIFOLD
NOZZLE 290

VENTILATOR HOOD
14
SYMPTOM POSSIBLE CAUSE SUGGESTED REMEDY
Entire unit inoperative
No lights glow
No buzzer sounds
Unit unplugged. Plug power cord into receptacle
Circuit breaker off or tripped Reset circuit breaker
Damaged power cord Replace power cord
Damaged power switch Check switch. Replace as req’d.
External interlock jumper loose or
damaged (unit is not connected to
building fire control system)
Check jumper. Repair or replace
as required
External interlock open (unit
connected to building fire control
system)
Locate and rectify open circuit
condition in building fire control
system.
Cooking appliance inoperative
“POWER” light on hood ON. Vent
fan working ok with no service
Contactor, wiring or connectors
damaged Replace contactor Repair wiring
Cooking appliance inoperative
“POWER” light on hood ON.
Vent fan working OK.
"SERVICE REQUIRED" light ON
Vacuum line to switch VS4
restricted Check for restriction in vacuum line to switch.
Vacuum switch VS4 open or
defective Check vacuum switch VS4. Replace as req’d.
Vacuum pickup port in plenum, or
vacuum port on blower plugged
Clean vacuum ports
NOTE: Vacuum port in plenum
may appear as a place to attach
a nozzle. Do not attach a nozzle
here. It will block the vacuum
signal (see pg 11).
Fire damper tripped
Replace fire damper
NOTE: While the fusible link alone
may be replaced, once the
damper has tripped it may no
longer function reliably.
Grease baffle and/or filter pack
position switch(es) open
Missing or un-seated filter assy.
Reseat filter or adjust interlock
switch.
Vacuum switch VS1 open or
damaged
Be sure pre-filter is hooked in
position. Check for damaged
vacuum line, or one that is
disconnected at the vacuum
switch or pick-up port. Also check
port for grease contamination.
Vent fan working OK, but amber
“CHECK FILTERS” light stays ON
HOOD SECTION - TROUBLESHOOTING SUGGESTIONS
SV504 SvcManual WV-4H(RW)

VENTILATOR HOOD
15
HOOD SECTION - TROUBLESHOOTING SUGGESTIONS (continued)
SYMPTOM POSSIBLE CAUSE SUGGESTED REMEDY
Vent fan working OK, but amber
“REPLACE PREFILTER” light ON. Prefilter is at end of service life Replace prefilter
Vacuum Switch VS3 damaged Replace vacuum switch VS3
“REPLACE PREFILTER” light
turns on some of the time.
Pre-filter frame not hooked in
position at top Hook metal pre-filterframe at top to prevent air blowing around filter
Pre-filter position switch SW1
misadjusted or damaged. Check switch SW1, adjust or replace
Prefilter is nearing end of service
life Replace prefilter
Filter pack nearing end of its
service life Replace filter pack
Filter pack vacuum switch VS2
lines restricted or switch damaged. Check switch VS2, repair vacuum lines or replace switch.
Vent fan not operating and buzzer
is sounding.
Appliance newly installed and
Ansul® system not yet charged.
Check status of Ansul® system at
rear of unit, if fired, call Ansul®
Service Distributor for set-up.
Ansul® system has been set off by
overtemp condition, or manual pull
station has been activated.
Check status of Ansul® system at
rear of unit, if fired, call Ansul®
Service Distributor for
replacement of fire suppression
agent and propellant. If fuse link
has been activated, it must be
replaced prior to re-cocking the
Ansul® system.
Vent fan not operating.
Buzzer silent.
Green “POWER” light ON.
Amber “CHECK FILTER” light and
red “SERVICE REQUIRED” light
ON.
Grease baffle not installed Install grease baffle.
Grease baffle position switch SW2
misadjusted or damaged. Check switch SW2, adjust or replace
“REPLACE FILTER PACK” light
ON.
SV504 SvcManual WV-4H(RW)

COOKTOP
HOTPLATE SECTION
16
CAUTION:
BURN HAZARD
Hotplate burner surfaces are very
hot during operation. Allow unit to
cool before performing any service.
IMPORTANT:
This element is designed for use
with high-temperature copper-tin
terminals. Do not use stainless
steel terminals.
SPIRAL HEATING EL:EMENT REPLACE MENT
Applicable to Wells WV-4HS-series ventless appliances.
Wells part number 50293: Revised to the latest UL requirements,
new replacement elements may connect differently than previously
available replacement elements.
To install a new element in an existing appliance:
1. Disconnect appliance from electric power and allow to cool.
Disconnect and remove old element.
2. Power leads require #8 high-temperature copper-tin ring
terminal connectors. Ground lead requires #10 high-
temperaturecopper-tin ring terminal connector. Replace or
install the appropriate connector terminals as required.
3. Mount new element.
4. Route wiring through trim ring as shown. Connect power and
ground leads.
a. Be sure to reconnect ground wire to mounting clip of
new element.
b. Slide insulator onto new element before connecting leads.
c. When properly installed, connector screws will hold
insulator in place.
5. Reconnect appliance to electric power and test for proper
operation.
SV504 SvcManual WV-4H(RW)
DESCRIPTION POSSIBLE PROBLEM SUGGESTED REMEDY
Hotplate will not heat Hood section not "ON" Verify that Hood Power Switch is
"ON". If "SERVICE REQUIRED"
indicator is lit, rectify filter problem.
One hotplate does not
heat
Temperature control knobs not set to
desired temperature Set to desired temperature
Cooling fan not operating Check cooling fan and associated
wiring for hotplate control section.
Replace as required.
Hotplate does not get
hot enough 240V unit operating on 208V Verify operating voltage Operate on proper voltage
Damaged internal component
Check infinite switch, element, and
wiring. Replace damaged
components, repair wiring and loose
connections as required.
HOTPLATE SECTION - TROUBLESHOOTING SUGGESTIONS

COOKTOP
SOLID (FRENCH PLATE) ELEMENT REPLACEMENT
Applicable to Wells WV-4HF-series ventless appliances.
Wells has introduced an upgraded element terminal lug for solid
(French plate) element cooktops. Units built prior to June 1, 2001
will require this upgrade when replacing elements.
1. When only the Ceramic Terminal Block is damaged and the
Element wire is not fused: Replace with Kit 503972. This
Kit replaces the Terminal Block with the new wire set.
NOTE: Kit p/n 503972 does not include the element..
2. If the element or element wires are damaged, or if the
connector is fused to the power leads, replace with complete
element kit 503973 (240V).
ELEMENT, NEW TERMINAL LUG AND CERAMIC INSULATOR
PN 503973 (240V)
CAUTION:
BURN HAZARD
Hotplate burner surfaces are very
hot during operation. Allow unit to
cool before performing any service.
New wires with lugs spliced to
existing wire set and inserted
into new insulator. Tighten set
screws securely.
IMPORTANT: Do not cut fused
wire on element to replace terminal
block, this voids U.L.
HOTPLATE COOKTOP UNIT (continued)
SV504 SvcManual WV-4H(RW)
17
214
ELEMENT
COLD PIN
SPOON SHAPED
TERMINAL LUG

DRAWER WARMER
1. The optional drawer warmer unit is a Wells RW-26HD or
RWT-26HD two-drawer roll warmer unit.
2. The drawer warmer has two individually controllable sections.
a. Control of RW-style unit is via bulb and capillary
thermostat with SPST switch.
b. Control of RWT-style unit is via electronic controller.
3. Each section is heated by a single element of roughly
rectangular configuration.
4. Drawer warmer is powered by the drawer warmer relay
5. Optional dial thermostat may be located on either or both
drawer sections.
6. Digital controller will replace thermometer-equipped units in
new production. Thermometer-equipped units are to become
obsolete.
CAUTION:
BURN HAZARD
Interior of drawer warmer cavity will
be hot during operation. Allow unit
to cool before performing any
service.
NOTE:
In the absence of a drawer warmer
appliance, the WVG-136 is
equipped with a storage cabinet in
the base. This single cabinet has
two doors.
OPTIONAL
HUMITROL
RACK
PRODUCT
PAN
DRAWER
ASSEMBLY
THERMOSTAT
CONTROL
KNOB
OPTIONAL DIAL
THERMOMETER
LATCH
ASSEMBLY
DRAWER
STOP
LED READOUT
"PROCESS" KEY
INCREMENT AND
DECREMENT KEYS
ºF OR ºC
INDICATORS
LOAD
INDICATOR
CONTROLMODULE
PROCESS
OPTIONAL ELECTRONIC CONTROL
POWER
SWITCH
CONTROL
MODULE
18
SV504 SvcManual WV-4H(RW)
DRAWER WARMER SECTION - OPERATIONAL NOTES