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WOLF WWD30

Subzero WOLF WWD30 Service Manual

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Page 1
subzero.com 800.222.7820
WWD30
Service Manual
General Information 2 Installation Information 5 Controls & Operation 12 Component Access & Removal 24 Troubleshooting Guide 34 Wiring Diagrams 40
Page 2
Warming Drawer WWD30-2
General Information
1-2
This manual is designed to be used by Authorized Service Personnel only. Wolf Appliance, Inc. assumes no responsibility for any repairs made to Wolf appliances by anyone other than Authorized Service Technicians.
TECHNICAL ASSISTANCE
If you should have any questions regarding a Wolf appliance and/or this manual, please contact:
Wolf Appliance, Inc.
ATTN: Service Department
P.O. Box 44988
Madison, WI 53744-4988
Customer Service & Parts / Warranty Claims
Phone #: (800) 332 - 9513
Technical Assistance
Phone #: (800) 919 - 8324
Customer Service & Technical Assistance
Facsimile #: (608) 441 - 5887
Parts / Warranty Claims
Facsimile #: (608) 441 - 5886
Service Department e-mail Address
customerservice@wolfappliance.com
Office Hours:
7:00 AM to 7:00 PM Central Time
Monday through Friday
IMPORTANT SAFETY INFORMATION
Below are Product Safety Labels used in this manual. The "Signal Words" used are WARNING and
CAUTION.
Please note that these safety labels are placed in areas where awareness of personal safety and product safety should be taken.
INTRODUCTION
This Wolf Warming Drawer Technical Service Manual has been compiled to provide the most recent technical serv­ice information about the Wolf Warming Drawer including parts list and exploded views. This information will enable service technician’s to troubleshoot and diagnose malfunctions, perform necessary repairs and return a Wolf Warming Drawer to proper operational condition.
The Service Technician should read the complete instructions contained in this technical service manual before initi­ating any repairs on a Wolf Appliance.
INDICATES THAT HAZARDOUS OR UNSAFE PRAC­TICES COULD RESULT IN SEVERE PERSONAL INJURY OR DEATH
Indicates that hazardous or unsafe practices could result in minor personal injury or product and/or property damage
In addition, please pay attention to the signal word “NOTE”, which highlights especially important informa­tion within each section.
The information and images are the copyright property of Wolf Appliance, Inc., an affiliate of Sub-Zero, Inc. Neither
this manual nor any information or images contained herein may be copied or used in whole or in part without the
express written permission of Wolf Appliance, Inc., an affiliate of Sub-Zero, Inc. © Wolf Appliance, Inc.
all rights reserved.
Page 3
General Information
Warming Drawer WWD30-2
1-3
#814750 - Revision A - January, 2011
Section 4 - Component Access and Removal .................4-1
Component Access and Removal ......................................4-2
Warnings & Cautions ......................................................4-2
Section 4 - Component
Access and Removal (Continued)
Stainless Steel Drawer Box ............................................4-3
Drawer Removal ..............................................................4-3
Drawer Slide Removal ....................................................4-4
Drawer Front Panel Removal ..........................................4-4
Drawer Mounting Panel Removal....................................4-4
Control Cable Removal ..................................................4-5
Control Panel Removal....................................................4-5
Thermistor Removal ........................................................4-5
Drawer Switch Removal ..................................................4-6
Drawer Frame Removal ..................................................4-6
Fan Assembly Removal ..................................................4-7
Power Board Removal ....................................................4-7
Thermal Cut-Out Removal ..............................................4-8
Front Gasket Removal ....................................................4-9
Heating Element Removal ............................................4-10
Power Cord Removal ....................................................4-11
Section 5 - T
roubleshooting Guide................................ 5-1
Troubleshooting Guides Introduction ..................................5-2
How to Use General Troubleshooting Guide ......................5-2
General Troubleshooting Guide Table of Contents ............5-2
Warnings and Cautions ..................................................5-2
Error Codes Troubleshooting Guide ..................................5-3
Field Service Mode ............................................................5-4
Initiating Diagnostic Mode ..............................................5-4
General Troubleshooting Guide ......................................5-5
Unit Does Not Function at All ..........................................5-5
No Heat at Any or All Settings ........................................5-5
No Heat at PROOF Setting Only ....................................5-5
Excessive Heat at Any or All Settings ............................5-5
Excessive Condensation in Drawer ................................5-5
Food Dries Out ................................................................5-6
One or More LED Does not Illuminate ............................5-6
LED Display is Black ......................................................5-6
One or More LED Illuminated Consistently ....................5-6
Drawer Does Not Slide Smoothly....................................5-6
Drawer Does Not “Pull In” ..............................................5-6
Section 6 - T
echnical Data .............................................. 6-1
Temperature Information................................................... 6-2
Heating Element Information............................................. 6-2
Thermal Cut-Out Information............................................. 6-2
Thermistor Testing Information........................................... 6-2
Power Board Identification................................................. 6-2
Section 7 - W
iring Diagram ............................................. 7-1
Wiring Diagram (Domestic) ................................................7-2
TABLE OF CONTENTS
Page #
Section 1 - General Information ........................................1-1
Introduction...........................................................................1-2
Important Safety Information.................................................1-2
Technical Assistance.............................................................1-2
Table of Contents..................................................................1-3
Warranty Information.............................................................1-4
Serial Tag Location and Layout..........................................1-4
Model Features.....................................................................1-5
Keypad Layout...................................................................1-5
Section 2 - Inst
allation Information ...................................2-1
Installation Information..........................................................2-2
Electrical Requirements........................................................2-2
Cabinet Supports..................................................................2-3
Installation Specifications......................................................2-3
Undercounter Installation......................................................2-3
WWD30 Installation with Built-In Oven.................................2-3
Section 3 - Electronic Control Information
......................3-1
Component Location ..........................................................3-2
Electronic Control System Diagram....................................3-2
Keyboard Panel Layout ......................................................3-2
Description Overview ..........................................................3-3
Element............................................................................3-3
Fan ..................................................................................3-3
Drawer Input ....................................................................3-3
User Display ....................................................................3-3
Power Key ......................................................................3-3
Temp Up/Down key ........................................................3-3
Timer Key ........................................................................3-3
System Modes ....................................................................3-4
Power Up ........................................................................3-4
On Modes ........................................................................3-4
Normal Warming Mode....................................................3-4
Preset Mode ....................................................................3-5
Temperature Maintenance ..............................................3-6
End of Warming Time......................................................3-7
Off Modes ........................................................................3-7
Timer Mode......................................................................3-7
Sabbath Mode ................................................................3-8
Showroom Mode..............................................................3-8
User Preference Setup ......................................................3-9
User Preference Offsets ..................................................3-9
Temperature Display Preference ....................................3-9
Display Contrast Change ................................................3-9
LED Back Lighting Change ..........................................3-10
Field Service Mode ..........................................................3-11
Initiating Diagnostics Mode ............................................3-11
Field Service Mode Keystrokes ....................................3-12
Error Code Troubleshooting Guide ................................3-12
Field Service Mode Functional Test Keystrokes ..........3-13
Mode/Function Unique Keystrokes................................3-13
Page #
Page 4
Warming Drawer WWD30-2
General Information
1-4
WARRANTY INFORMATION
This page contains a copy of the One (1) Year Outdoor Warranty supplied with every Wolf unit designed for outdoor use. On the following page is the serial number information, which is needed for warranty purposes.
WARRANTY INFORMATION
This page contains a summary of the 2 & 5 Year Warranty that is supplied with most Wolf products
designed for indoor use, the Full One Year Warranty for Wolf outdoor products, followed by a Non Residential Warranty summary, then notes about the warranties.
TWO & FIVE YEAR Warranty Summary
• Two year TOTAL PRODUCT warranty, parts and labor.
• Limited Parts Only Warranty for the 3rd through 5th year on the following parts: heating element, elec­tronic control system.
NOTE: This warranty only applies to products
properly installed for normal residential use in the United States or Canada.
OUTDOOR PRODUCTS LIMITED WARRANTY
• Full One Year Product Warranty: This warranty covers the cost of all parts and labor to repair or replace any part of the product that proves to be defective in materials or workmanship during the first year.
• Limited LIfetime Warranty: Wolf Appliance will repair or replace any outdoor gas grill body or hood that rusts through due to defective materi­al or workmanship. Labor to remove and replace defective parts is not covered.
NON RESIDENTIAL Warranty Summary
• Two year TOTAL PRODUCT warranty, parts and labor.
NOTE: This warranty only applies to products installed in test kitchens, culinary and school kitchens, and other
installations which help promote Wolf Appliance products. Restaurant installations and other similar commercial applications carry no warranty.
Warranty Notes:
• All warranties begin at the time of the unit's initial installation.
• All Warranty and Service information collected by Wolf Appliance Inc. is arranged and stored under the unit serial
number and/or the customer's name. It is requested to have the model and serial number available whenever contacting the factory or parts distributor.
• See Figure 1-1 serial tag location and Figure 1-2 serial tag layout.
• All warranty repairs must be performed by a Wolf authorized service center, unless otherwise specified by Wolf Appliance.
• “ICB: warranties vary by Country and Distributor. Contact selling Distributor for warranty coverage.
Figure 1-1. Serial tag location
Figure 1-2. Serial tag
Serial Tag is below drawer on floor of appliance, visi-
ble with drawer fully open
Wolf Appliance Company, INC.
Fitchburg, WI
WOLF WARMING DRAWER
FOR HOUSEHOLD USE ONLY
OUTDOOR APPROVED
VOLTS :
120
Hz :
50/60
MODEL# : WWD30
"DO NOT IMMERSE IN WATER" "NE PAS PLONGE DANS L'EAU"
WATTS:
SERIAL# :
Page 5
General Information
Warming Drawer WWD30-2
1-5
#814750 - Revision A - January, 2011
Warming Drawer Model Features
Figure 1-3. Keypad Layout
Rack for stacking food
Removable Stainless
Steel Drawer
Stainless Steel Drawer Front
(Classic, Carbon and Platinum
Finishes Available)
Hidden Touch Control Panel
(See Figure 1-3)
Stainless Steel Interior
Galvanized Metal Exterior
LCD Display
Power On/Off
Temperature Control
Presets
Timer
(Can be used as Kitchen Timer)
Outdoor Model WWD30O is specifically designed and safe for outdoor applications and can also be installed indoors.
P O
W
O
E
N
R / O
F
F
T EM
P
H IG
H
M
P
E
R
D
E
L
S
OW
E
T S
PR
O
O
F
T I
M
E R
Page 6
Warming Drawer WWD30-2
Installation Information
2-2
INSTALLATION INFORMATION
The Wolf Warming Drawer is designed to be set into a built-in wall or cabinet installation. This section of the manual covers some of the installation issues that a service technician may need to know when
servicing a Wolf warming drawer. If additional installation information is needed after reviewing this section of the manual, please refer to the installation guide or contact Wolf Appliance, Inc. Customer Service Department at (800) 332-9513.
Electrical Requirements:
NOTE: All National Electrical Code regulations must be followed. In addition, be aware of local codes and ordi-
nances when installing your service.
• Dedicated 110 to 120 Volts AC, 60Hz, 15 or 20 ampere fused electrical supply
• Separate electrical circuit serving only this appliance
• A properly grounded 3-prong receptacle
Outdoor applications require that the unit be connected to a properly grounded GFCI circuit.
Line
Voltage
(Power)
Neutral
Ground
TO AVOID SHOCK HAZARD, THE INSTALLATION SITE MUST BE EQUIPPED WITH A PROPERLY GROUNDED 3-SLOT RECEPTACLE TO MATCH THE 3-PRONG (GROUNDED) POWER SUPPLY CORD PROVIDED ON THE APPLIANCE.
TO AVOID SHOCK HAZARD, NEVER REMOVE THE GROUND PRONG FROM THE PLUG OF THE POWER SUPPLY CORD.
Figure 2-1. Electrical Receptacle
NOTE:
This appliance must be installed in accordance with National Electrical Codes, as well as all state, munici­pal and local codes. The correct voltage, frequency and amperage must be supplied to the appliance from a dedi­cated, grounded circuit which is protected by a properly sized circuit breaker or time delay fuse. The proper voltage, frequency, and amperage ratings are listed on the product rating plate.
Page 7
Installation Information
Warming Drawer WWD30-2
2-3
Cabinet Supports:
NOTE:
When the warming drawer is installed with a built-in oven, additional clearance between openings may be
required. Check that oven supports do not obstruct the interior dimensions required for the warming drawer.
NOTE: Dimensions in parentheses are in millimeters unless otherwise specified.
The warming drawer may be supported by either a solid 7/8” (22) platform or 2" (51) x 2" (51) or 2" (51) x 4" (102) runners. The platform or runners must be level, rigidly mounted and flush with the bottom edge of the opening. They must be able to support 200 lbs. (90.7 kg).
NOTE:
Make sure that the platform or runners are level. There is no way to level the warming drawer once it has
been installed.
Warming Drawer Installation:
Install a 2" (51) x 2" (51) or 2" (51) x 4" (102) anti-tip block against the rear cabinet wall.
Turn power off to the electrical outlet.
Slide the left corner of the warming drawer into the open­ing.
NOTE: A 6 foot power cord is supplied with the unit.
Depending on the outlet location, the unit can be set in front of opening and plugged in.
If the electrical outlet is installed inside the opening, plug the power cord into the outlet. The excess cord should be coiled and secured directly behind warming drawer. If the outlet is located in an adjacent cabinet, thread the power cord through the hole in the cabinet wall. Push the drawer back into the opening until the front flange is flush with the cabinet front. Make sure the power cord does not get trapped under the warming drawer.
Open the warming drawer to its full extension. Then, drill pilot holes in each corner of the warming drawer through holes in the side frame and install the wood screws provided with the unit. (See Figure 2-2)
Figure 2-2. Drilled Pilot Holes for Securing Unit
Pilot Holes
MODEL WWD30
with Stainless Steel Drawer & Integrated Front
Overall Width 29 7/8" (759)
Overall Height 10 3/8" (264)
Overall Depth 26 1/4” (689)
Overall Depth (behind frame) 22 3/4" (578)
Minimum Cabinet Width 30" (762)
Minimum Cabinet Depth 24" (610)
Minimum Base Support 200 lbs (91 kg)
Opening Width 28 5/8" (727)
Opening Height 9 1/8" (232)
Opening Depth 23 7/8” (606)
Dimensions may vary to
+ –
1
/8" (3).
Allow 3/8” (11) Additional depth for cord thickness
223/4"
(578)
9"
(229)
103/8"
(264)
297/8"
(759)
26 1/4” (667)
OVERALL DEPTH
OVERALL WIDTH
BEHIND FRAME
Figure 2-4. Overall Cabinet Dimensions
Installation Specifications:
The following pages provide the overall dimensions, finished rough opening dimensions and electrical placement for the Wolf warming drawer with stainless steel drawer front. For information on integrat­ed Drawer Fronts, see the installation instructions provided with the product.
Wolf recommends using a 33" (838) wide cabinet for the warming drawer with stainless steel drawer front. A minimum 30" (762) wide by 24" (610) deep cabinet is required with a minimum base support of 200 lbs (91 kg). (See Figure 2-3 and 2-5)
Figure 2-3. Overall Unit Dimensions
Anti-Tip Block
Page 8
Warming Drawer WWD30-2
Installation Information
2-4
Undercounter Installation:
For undercounter installations, 23 1/2" (597) from the bottom of the warming drawer opening to the floor is recom­mended. Electrical can be installed anywhere except location shown. A minimum of 5" (127) above the floor or 1" (25) above the toe kick.
The Wolf warming drawer with stain­less steel drawer front may be installed below an electric or gas cooktop, provided the warming drawer is fully enclosed, top and bottom. Refer to installation instructions for the cooktop for additional specifica­tions. Dimensions will vary according to the specific installation. (See Figure 2-5)
Warming Drawer Installation with Built-In Oven and/or Microwave:
The warming drawer may be installed in combination with a Wolf built-in oven and/or microwave, provided the warming drawer is fully enclosed, top and bottom. See Figure 2.6
NOTE: Dimensions will vary according
to the specific installation.
The Wolf warming drawer is designed and agency approved for installation with Wolf built-in ovens and/or microwaves. See the label attached to the top of the warming drawer for approved models.
The warming drawer platform must be able to support 200 lbs. (91 kg). It must be a minimum of 1" (25) above the toe kick to allow for the overlap of the warm­ing drawer trim.
NOTE:
Additional clearance between warming drawer and oven openings may be required. Check that oven supports do not obstruct the interior dimensions required for the warming drawer.
When the warming drawer is installed below a built-in oven, a minimum of 2 3/8" (60) between warming drawer and oven openings is required for clear­ance of overlaps. When installed above a built-in oven, a minimum of 7/8" (22) is required.
NOTE:
When the warming drawer is installed above a built-in oven, a 7/8" (22) platform is required to allow for clearance of overlaps.
24"
(610) min
OPENING DEPTH
*P latform mus t suppor t 250 lbs
(113 kg)
.
NO TE : Loc ation of elec trical s upply within oven opening may requ ire a dditio nal ca binet de pth.
FRONT VIEWSIDE VIEW
285/8"
(727)
WARMING DRAWER
OPENING WIDTH
281/2"
(724)
OVEN OPENING WIDTH
E
E
MICROWAVE
OPENING
273/16"
(691)
11/2"
(38) min
E SERIES
1"
(25) min
L SERIES
91/8"
(232)
3
/4"
(19)
min
PLATFORM*
E
E
5"
(127)
4"
(10 2)
ANTI-TIP BLOCK
DIMENSION WILL VARY*
*Dimens ion must a ccommodate height of a nti- tip bloc k and dra wer fac e overla p.
NO TE : L ocation of ele ctrical s upply within opening may require additional ca binet depth. Da s hed line repres ents profile of unit.
FRONT VIEWSIDE VIEW
E
24"
(610) min
CABINET DEPTH
285/8"
(727)
OPENING WIDTH
PLATFORM
91/8"
(232)
OPENING HEIGHT
103/8"
(264)
231/2"
(597)
TYPICAL
36"
(914)
FLOOR TO
COUNTERTOP
Figure 2-5. Undercounter Installation
Figure 2-6. Installation with Built-In Wall Oven and/or Microwave
Page 9
Installation Information
Warming Drawer WWD30-2
2-5
Recessed or Flush Inset Installation
In addition to the standard installation the warming drawer with E series drawer front can be installed in a recessed or flush inset application. A recessed installation requires the cabinetry be recessed by 3/16" (5) so the collar is flush with the cabinet face frame but the drawer front will sit proud. A flush inset installation requires the drawer collar and front panel be recessed to be flush with surrounding cabinetry. Refer to illustrations on the following pages for mini­mum cabinet dimensions for your specific installation.
Install Recessed Cleats and Platform
For a recessed or flush inset application, you will need to install a recessed platform and cleats into the opening. Proper recess of the platform and cleats is critical to the function and esthetics of the warming drawer installation.
The depth of the platform may increase with the cabinet depth. Be sure to rigidly mount the platform so that it can support a minimum of 200 lbs (91 kg). (See Figure 2-7)
Mounting holes will need to be drilled in the back of the drawer front panel. Holes should be drilled on site to ensure proper fit and gaps are achieved. A drilling template is provide with the integrated drawer front.
NOTE:
Be sure to finish the inside lip of the opening and the front face of the platform and cleats. These areas
may be visible when the drawer is open.
NOTE:
Be aware of the location of the mounting holes on the warming drawer frame to make sure screws used to
attach the cleats do not interfere with screw holes for mounting the warming drawer.
Flush Inset Installation Under Counter
PLATFORM
TOP C LEAT
SIDE CLEAT
CABINETRY
OPENING
CLEATS AND PLATFORM
RECESSED
3
/16"
(5)
R ec es s ed applic a tio n . Flus h ins et a pplic ation.
PLATFORM
TOP C LEAT
SIDE CLEAT
CABINETRY
OPENING
CLEATS AND PLATFORM
RECESSED
3
/16"
(5)
PLUS THICKNESS
OF DECORATIVE PANEL
Figure 2-7. Install Platform and Cleats
DIMENSION WILL VARY*
231/2"
(597)
TYPICAL
*Dimension mustaccommodate heightof anti-tip block and drawer face overlap.
NO TE : D imensions provided a llow for
1
/4" (6) re veal for prope r a ir flow. Loc ation of electrica l s upply within opening may re quire a dditional
ca binet depth. Da shed line represents profile of unit.
FRONT VIEWSIDE VIEW
24"
(610) min
CABINET DEPTH
303/8"
(772)
FLUSH INSET WIDTH
285/8"
(727)
OPENING WIDTH
7
/8"
(22)
PLATFORM
7
/8"
(22)
TOP AND SIDE CLEATS
36"
(914)
FLOOR TO
COUNTERTOP
107/8"
(276)
FLUSH INSET
H
EIGHT
91/8"
(232)
OPENING HEIGHT
E
E
SIDE CLEATS
24
(610) min
FLUSH INSET
DEPTH
1"
(25)
TOP VIEW
ANTI-TIP BLOCK
Page 10
Warming Drawer WWD30-2
Installation Information
2-6
Flush Inset Tower Installation
25"
(635) min
CABINET DEPTH
303/8"
(772) min
FLUSH INSET WIDTH
SIDE CLEATS
243/4"
(629) min
FLUSH
INSET
DEPTH
1"
(25)
*
Platform mustsupport250 lbs
(113 kg).
NO TE : L oca tion of e lectrical s upply within ove n ope ning ma y re quire a dditiona l ca binet depth. Da she d line repres ents profile of unit.
FRONT VIEWSIDE VIEW
TOP VIEW
105/8"
(270)
FLUSH INSET
HEIGHT
91/8"
(232)
OPENING HEIGHT
E
1"
(25)
PLATFORM
285/8"
(727)
WARM ING DR AWER
OPENING WIDTH
17"
(432)
OPENING
HEIGHT
181/2"
(470)
FLUSH INSET
HEIGHT
271/2"
(699)
STANDARD MICROWAVE
OPENING WIDTH
E
281/2"
(724)
E SERIES OVEN
OPENING WIDTH
11
/16"
(17)
TOP CLE A T
9
/16"
(14)
PLATFORM*
1"
(25)
SIDE CLEATS
E
E
5"
(127)
4"
(102)
273/16"
(691)
OPENING
HEIGHT
281/8"
(714) min
FLUSH INSET
HEIGHT
111/16"
(43)
PLATFORM
INS TALLATION WITH S TANDAR D MICR OWAVE AND E S ER IES OVE N
Page 11
Installation Information
Warming Drawer WWD30-2
2-7
#814750 - Revision A - January, 2011
Flush Inset Tower Installation
25"
(635) min
CABINET DEPTH
303/8"
(772) min
FLUSH INSET WIDTH
SIDE CLEATS
243/4"
(629) min
FLUSH
INSET
DEPTH
1"
(25)
*
Platform must s upport 250 lbs
(113 kg).
NO TE : L ocation of electrical s upply within ove n opening may re quire a dditiona l ca binet depth. Da she d line repres ents profile of unit.
FRONT VIEWSIDE VIEW
TOP VIEW
105/8"
(270)
FLUSH INSET
HEIGHT
91/8"
(232)
OPENING HEIGHT
E
1"
(25)
PLATFORM
285/8"
(727)
WARMING DRAWER
OPENING WIDTH
187/8"
(479)
OPENING
HEIGHT
201/8"
(511)
FLUSH INSET
HEIGHT
271/2"
(699)
CONVECTION MICROWAVE
OPENING WIDTH
E
281/2"
(724)
E SERIES OVEN
OPENING WIDTH
1
/2"
(13)
TOP CLE A T
9
/16"
(14)
PLATFORM*
1"
(25)
SIDE CLEATS
E
E
5"
(127)
4"
(102)
273/16"
(691)
OPENING
HEIGHT
281/8"
(714) min
FLUSH INSET
HEIGHT
15/8"
(41)
PLATFORM
INS TALLATION WITH C ONVE CTION MICR OWAVE AND E SER IES OVEN
Page 12
Warming Drawer WWD30-2
Installation Information
2-8
Flush Inset Tower Installation
273/16"
(691)
OPENING
HEIGHT
281/8"
(714) min
FLUSH INSET
HEIGHT
281/2"
(724)
E SERIES OVEN
OPENING WIDTH
25"
(
635) min
CABINET DEPTH
303/8"
(772) min
FLUSH INSET WIDTH
281/2"
(724)
DRAWER MICROWAVE
OPENING WIDTH
E
7
/8"
(22)
TOP CLE A T
9
/16"
(14)
PLATFORM*
5
/8"
(16)
PLATFORM
SIDE CLEATS
243/4"
(629) min
FLUSH
INSET
DEPTH
11/4"
(32)
FOR MICROWAVE
1"
(25)
FOR
OVEN
AND WARMING
DRAWER
*
Platform mustsupport250 lbs
(113 kg.
NO TE : L ocation of electric a l s upply within ove n opening may re quire a dditiona l ca binet depth. Da she d line repre sents profile of unit.
FRONT VIEWSIDE VIEW
TOP VIEW
143/4"
(375)
OPENING
HEIGHT
153/8"
(391)
FLUSH INSET
HEIGHT
1"
(25)
SIDE CLEATS
105/8"
(270)
FLUSH INSET
HEIGHT
91/8"
(232)
OPENING HEIGHT
E
1"
(25)
PLATFORM
285/8"
(727)
WARM ING DR AWER
OPENING WIDTH
E
E
5"
(127)
4"
(102)
INS TALLATION WITH DR AWE R MICROWAVE AND E S ER IES OVEN
Page 13
Warming Drawer WWD30-2
Electronic Control Info.
3-2
GENERAL INFORMATION:
Electronic control will provide temperature control in the warming drawer as determined and set by user. Up and down arrow keys are provided to increase and decrease, respectively, the temperature of the drawer and operation time. Temperature control range of the warming drawer main board control will be 80ºF to 200ºF (26.7ºC to 93.3ºC). Amplitude of this temperature control will be ± 5ºF. When the control sees a temperature at the thermistor 5ºF above set-point, control will open the element relay. Once the control sees a thermistor temperature of 5ºF below set-point, the relay will close allowing element to cycle on.
Power/Relay Board
Circulation Fan
Ele ment
Display Board/ Ke ypad
Flex Cable
(Inner ceiling)
(Network Cable)
Electronic Control Board
(Behind Front Panel)
Door Switch
(Bottom of Drawer Front)
Display
Beeper
CONTROL (all low temp components)
Keypad
Communications
Thermistor
POWER BOARD
AC Fan
Element
(850W)
Flex Cable
Door Input
DLB
(CB/CE Model only)
Figure 3-1. Component Location Top View.
Figure 3-2. Electronic Control System Diagram.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
LCD Display
Power On/Off
Temperature Controls
Preset Controls
Timer Controls
Figure 3-3. Keyboard Layout.
Page 14
Electronic Control Info.
Warming Drawer WWD30-2
3-3
DESCRIPTION OVERVIEW:
Element:
The element will be powered by the element relay (normally-open contacts). This allows the element to be disabled under most conditions. Only during a call for heat from the main controller, will the element relay be energized.
Fan:
The fan will be powered by the fan relay (normally-open contacts). This allows the fan to be disabled under most conditions. Only during a warming mode from the main controller, will the fan be in use.
Drawer Input:
The drawer switch will be a normally open switch, (when drawer is open), and closed when drawer is closed. When drawer is opened and is in a normal heating mode, unit will de-energize relays to fan and element. If back lighting of the LCD is enabled, then opening of the drawer will turn on back lighting, and by closing the drawer, back lighting will go off.
NOTE: Sabbath mode has unique requirements. Please see Sabbath mode this section.
User Display:
The user display shows warming drawer preset temperature, any timed feature which is in process, and whether the unit is in Proof mode. Other indicators include the ‘ON’ indicator which notes when unit is heating, (always on when in the Sabbath mode), and displays which temperature units, (°F or °C), the temperature is being displayed in. This area also informs user if there is an issue with the control and will display an error code in the temperature and/or timer display. The user display numbers will be displayed as shown in the following pages.
The characters in the user display will only be illuminated when a normal warming mode, service diagnostic mode, or kitchen timer is being used. At all other times, display will be remain off.
The “PROOF” is on anytime “PROOF” mode is being used. The “ON” indicator is on anytime control is calling for heat. The exception is during Sabbath mode where the ”ON”
indicator stays on constantly.
NOTE: “TIMER” is on anytime there is a timed warming event or if kitchen timer is being used. NOTE: “TIMER” is not an option in Sabbath mode.
POWER Key:
The “POWER” key is used to turn unit on and off. While unit is in “OFF” mode, the Power key and “TIMER” up and down arrow keys remain active. If unit is powered up and Power key is pressed, the display will turn off along with any associated backlighting. If unit is off and the Power key is pressed, the control backlighting (if applicable), will turn on and the rest of the keys will be active.
NOTE: If no other key is pressed within 20 seconds, unit will turn off.
TEMP Up/Down Key:
The “TEMP” up or down arrow keys can be used to adjust temperature. By pressing and holding the up or down arrow, unit will begin changing at the rate of 1º per ½ second until the first 5º increment is obtained. If the user con­tinues pressing, control will increment in 5º increments per ½ second. The “TEMP” up or down arrow keys remain active as long as control is On.
NOTE: Exception to this is in the Sabbath Mode. NOTE: Temperature range is 80ºF to 200ºF, except in “PROOF” mode where maximum temperature is 120ºF.
TIMER Key:
The “TIMER” up or down arrow key is used to change time left in normal warming mode. Timer keys can also be used as a Kitchen Timer. The rate of this ascension shall be ½ second per increment and in the following order: one minute from 1-5 minutes; every five minutes from 5-30 minutes; 30 minute increments up to 5 hours; then hourly up to 24 hours. At any time during a Normal Heating Mode, operator can adjust time left for warming by pressing “TIMER” up or down arrow keys.
NOTE: The exception to this is during the Sabbath Mode (only the “Power On/Off” key is active in this mode).
Page 15
Warming Drawer WWD30-2
Electronic Control Info.
3-4
SYSTEM MODES:
The control can be placed into several different operational modes which changes preset conditions inside the warm­ing drawer. Details as to what each mode does to the operation of the drawer can be found below.
POWER UP:
Power up is defined as the initial application of power to the appliance through the power cord; not to be confused with switching the unit on/off with the “Power On/Off” key. During power up, all segments of the LCD will illuminate for 5 seconds before the unit goes into off mode.
After entering unit off mode, display will show “PF” in the time display until user presses a key. If unit was previously in a warming mode prior to power loss, control will also emit a power failure chime every 30 seconds while displaying “PF” until the “Power On/Off” is pressed.
NOTE: Pressing any key will clear “PF” error and unit will operate normally.
ON MODES:
ON Modes control behavior of electrical components of the appliance when it is “ON”. Switching the unit on is accomplished buy pressing the “Power On/Off” key. When ON, any back lighting will immediately activate “- - -” will be displayed in the temperature display with the respective temperature scale (F or C) blinking. (See Figure 3-4)
NOTE: If no other key is pressed within 20 seconds, unit will switch off.
NORMAL WARMING MODE:
Normal warming mode is the basic operating mode when power is turned on and any warming function is selected. This will include heating by the element and circulation of air by use of the fan.
Mode Entry:
The unit can be placed into a normal warming mode by simply pressing the “Power On/Off” key followed by either “TEMP” up or down arrow keys, or any preset is pressed. (See Figure 3-4)
NOTE: If no other key is pressed within 20 seconds, unit will switch off.
Operations:
Once unit is turned on and “TEMP” up or down arrow is pressed, unit will initiate at 120°F and can be adjusted in increments of 1°F. If you press and hold either arrow, the display will increase by 1° each 1/2 second until the first 5° increment is obtained then will increase by 5° per 1/2 seconds. (See Figure 3-5)
NOTE: Temperature is adjustable from 80°F to 200°F (26.7°C to 93.3°)
Mode Exit:
Pressing “Power On/Off” key will terminate Normal Warming Mode and shut unit off.
NOTE: The mode will also exit by reaching ‘0:00,’ on the timer. At this point, ‘0:00’ will begin flashing and the ele-
ments and fan will shut off. The control will also yield three chimes every 30 seconds to denote unit has shut off. After 5 minutes the timer will self power down if the “Power On/Off” key is not pressed.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-5. Temperature Adjustment in Normal Warming Mode.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-4. Power On Mode.
Page 16
Electronic Control Info.
Warming Drawer WWD30-2
3-5
NORMAL WARMING MODE: Operations: (Continued)
If temperature of unit is greater than 10ºF above set-point, control will chime and “hot” will flash in the temperature display. Control will continue to check if temperature has dropped, every 20 seconds. Once temperature, as moni­tored by the thermistor, is within 10°F of set temperature, set temperature will be displayed and resume cycling nor­mally. “HOT” indicator will no longer be illuminated. (See Figure 3-6)
NOTES:
• If drawer is closed at the time of power down, control will initiate a failure tone.
• If no time is set, timer will automatically default to 4:00 hours. This ensure a definitive stop time. This does not
occur in Sabbath Mode.
• If any presets are depressed, unit will begin to function. See Preset for further information.
• During normal warming mode, all keys remain active to allow for changes to mode.
PRESET MODES: (High, Medium and Low Presets)
Mode Entry:
Press “Power On/Off” key followed by either the HIGH, MED or LOW preset key. (See Figure 3-7)
NOTES:
• “TIMER” will illuminate and flash when first entering mode. Once mode is active the “TIMER” will no longer be illuminated.
• If no time is set, timer will automatically default to 4:00 hours. This ensures a definitive stop time.
Operations:
When “HIGH” Preset key is depressed, control will display “200F” in temperature display. For “MED” temperature display will read “160F” and for “LOW” temperature display will read “120F”. In timer area of display, “4:00” along with “TIMER”’ will be flashing. Temperature can be adjusted by pressing the “TEMP” up or down arrow keys. By touching the “TIMER” up or down arrow keys, additional time can be added or subtracted. Anytime a change is being made, the control begins flashing the changing value. Mode activation time for the control will be 2 seconds and the “ON” indicator will illuminate and “TIMER” will no longer be illuminated.
Mode Exit:
Pressing “Power On/Off” key will cancel preset and any related timer feature of this mode. If timer expires during preset mode, and after signaling end of time chime for 5 minutes, the unit will time out and power off.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-6. “HoT” Indication if Temperature of unit is 10° above set-point.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-7. Example of “LOW” preset.
Page 17
Warming Drawer WWD30-2
Electronic Control Info.
3-6
PRESET MODES: (Proof Mode)
Proof mode allows the customer to use the warming drawer for bread dough proofing. (See Figure 3-8)
Mode Entry:
Press the “Power On/Off” key followed by the “PROOF” key.
Operations:
Upon pressing the “PROOF” key. Control will display “85F” in the temperature display. In the timer area of display, ‘“4:00” along with “TIMER” will be flashing. Temperature can be adjusted by pressing the “TEMP” up or down arrow keys. By touching the TIMER up or down keys, additional time can be added or subtracted from this mode. Anytime a change is being made, the control begins flashing the changing value. The mode activation time for the control will be 2 seconds at which time the ‘ON’ indicator will illuminate and changes will be applied and additional indicators will stop flashing.
NOTE: Circulation fan runs while heating element is on during Proof Mode.
NOTE: If the unit is greater than 10ºF above the set-point, control will chime and “hot” will flash in the temperature
display until the unit temperature is within 10° of set temperature. The control will continue to check if temperature has dropped every 20 seconds.
Mode Exit:
Pressing “Power On/Off” key will cancel this mode and any related timer feature. If timer expires during “PROOF”, and after signaling end of time chime for 5 minutes, unit will time out and power off.
TEMPERATURE MAINTENANCE:
During temperature maintenance, element and fan maintains drawer temperature to set-point temperature. Fan is on while element is on during warming mode, (as long as drawer switch returns a drawer closed value). If element has cycled off, fan will continue to circulate air inside drawer for a pre-determined time before turning off. Fan will then re-energize when element is turned back on during a call for heat.
PREHEAT: Preheat can be described as the control operation occurring when trying to raise the temperature from more of an
ambient temperature to the operating temperature desired by the user.
Mode Entry:
The unit can be placed into a preheat mode by simply pressing the “Power On/Off” key and any other keys, when the drawer is cool (room temperature or less than set-point).
Operations:
If the “TEMP” up or down arrow key is pressed, unit will initiate at “120F” and can be adjusted in increments of 1°.
NOTE: If you press and hold either arrow, the display will increase by 1° each 1/2 second until the first 5° increment
is obtained then will increase by 5° per 1/2 second.
During preheat, control temperature read out will toggle between the set-point and actual drawer temperature. At temperatures lower than 85F, “LO” will be displayed. Temperatures equal to or greater than 85F, the actual tempera­ture measured by the thermistor and set-point temperature, will be toggled back and forth at a rate of 5 seconds. Once temperature has reached desired set-point temperature, control will emit a chime.
Mode Exit:
A press of the “Power On/Off” key will terminate Preheat mode and shut unit off.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-8. Example of “PROOF” preset.
Page 18
Electronic Control Info.
Warming Drawer WWD30-2
3-7
END OF WARMING TIME:
Upon reaching “0:00”, “0:00” will begin flashing. Element and fan will shut off at this time. Control will also emit three chimes every 30 seconds to denote unit has shut off. After 5 minutes the timer will power down and turn unit off.
NOTE: Operator can cancel chime earlier by pressing the “Power On/Off” key.
OFF MODES:
This mode is obtained by pressing the “Power On/Off” key once unit is in any “On” mode. All active modes on unit will be cancelled, including Sabbath Mode.
TIMER MODE:
This allows the unit to be used as a kitchen timer, if so desired. (See Figure 3-9)
Mode Entry:
To set timer, first depress “TIMER” up or down arrow keys. “TIMER” will be flashing in display. Press “TIMER” up arrow key and unit begins counting up from “00:00”.
NOTE: Pressing and holding “TIMER” up or down arrow key, display will increase, or decrease, by 1 second each
1/2 second until the first 5 second increment is obtained then will increase by 5 seconds per 1/2 second. If “TIMER” up or down arrow key is depressed for longer than 30 seconds display will increase by 30 minute increments each 1/2 second until 5:00 Hours is reached then increase in one hour increments up to 24:00 hours.
NOTE: Timer will count up in time with 1 minute as the minimum setting and going up to 24:00 (hours:minutes).
Operations:
In Timer mode, the temperature display will show nothing and “ON” indicator will not illuminate. Once set, this timer will count down in hours and minutes. Upon reaching 1 minute, the control will produce an audi­ble tone.
Mode Exit:
Upon reaching “0:00”, “0:00” will begin flashing. The control will also chime three times every 30 seconds to denote the unit has shut off.
NOTE: After 5 minutes the timer will power down. NOTE: Timer mode can be cancelled at any time by pressing the “Power On/Off” key.
NOTE: Operator may cancel chime by pressing “Power On/Off” key. This will also remove the flashing “0:00” from
display.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-9. Example of “TIMER” mode set at 4 minute.
Page 19
Warming Drawer WWD30-2
Electronic Control Info.
3-8
SABBATH MODE:
To accommodate observance of the Sabbath, a special mode exists where the control will only react to the “Power On/Off” key. In Sabbath Mode, the display will not change. “ON” remains on constantly. LCD back lighting will also remain on at all times during this mode at a rate of 50% normal power.
Mode Entry:
Starting from “Off” mode, press the “Power On/Off” key for 5 seconds. (See Figure 3-10)
Operations:
The control will flash “SAb” in timer display area and selections can be made for 5 seconds, while the “SAb” is flash­ing, at which time control will emit a tone twice and unit will remain in Sabbath mode.
NOTES:
• If back lighting was turned off prior to entering Sabbath mode then back light will remain off.
• Selections for Sabbath mode include “TEMP” up or down arrow keys and any “PRESET” keys.
• “TIMER” up or down arrow keys will yield an invalid key press in Sabbath mode.
• If unit power is interrupted, unit will return to Sabbath Mode upon next power up.
Once in Sabbath mode, unit will read “SAb” in the timer display area. The display will show no changes. The ele­ment cycles normally. Fan runs while element is on and for a short time after element turns off. If drawer is opened, fan and element will not shut off.
NOTES:
• If drawer is open for longer than 1 minute and the unit calls for heat, element will randomly turn on and off.
• If in Sabbath mode but a second key press does not occur withing 10 seconds, the unit will enter “OFF” mode.
Mode Exit:
A press of the “Power On/Off” key will terminate Sabbath mode and shut off unit at any time.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-10. Press and hold Power On/Off for 5 second to enter Sabbath Mode.
SHOWROOM MODE:
Showroom mode allows unit to be run in a demonstration mode. Heating element and fan operation are disabled.
Mode Entry:
Starting from Unit Off mode, press “Power On/Off” key along with “HIGH” and “LOW” PRESET keys for 5 seconds. A single soft tone will signify unit is in showroom mode and “Sr” will show in timer display. (See Figure 3-11)
NOTES:
• If power is turned off to unit, showroom mode will remain active.
• If unit power is interrupted (unplugged), unit will exit showroom mode upon next power up.
Operations:
Unit will function just as it normally would, but the fan and element will not energize while in this mode. The unit can be turned on and/or off, temperature adjusted, and timer used, but the unit will not provide heat/air circulation.
Mode Exit:
Another press of the same key combination from the Showroom mode will toggle showroom mode off.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-11. Press and hold Power On/Off, HIGH and LOW PRESET Keys simultaneously for 5 seconds.
Page 20
Electronic Control Info.
Warming Drawer WWD30-2
3-9
USER PREFERENCE SETUP
NOTE: Following changes must be made when unit is in “ON” mode.
Preset Change:
Changes can be made to presets by completing the following sequence. Press “Power On/Off” key, then press pre­set key you wish to change and hold for 5 seconds. After 5 seconds, timer display, temperature display and “TIMER” will illuminate and flash. Using “TEMP” up or down arrow keys, and/or the “TIMER” up or down arrow keys, change the values to your own personalized presets. After all settings are complete, press and hold the preset key being changed for 5 seconds again. Three quick tones will signify preset has been changed and unit will shut off.
NOTES:
• “PROOF” mode can only be adjusted from 80°F to 120°F.
• Unit will turn off after 30 seconds if no key presses are made.
• Changes to preset mode entered will be saved only if key being changed is pressed and held for 5 seconds after
making changes.
USER PREFERENCE OFFSETS (UPO)
NOTES:
• Following changes must be made when unit is in “OFF” mode.
• See Figure 3-20 for a quick reference to keystrokes to enter modes and features.
Temperature Display Preference:
Control can be switched between Fahrenheit or Celsius by pressing and holding both “TEMP” up and down arrow key for 5 seconds. Use the “TEMP” Up or Down arrow key to change from °F to °C or °C to °F. (See Figure 3-12)
NOTE: Press “Power On/Off” key to exit and save changes.
Display Contrast Change:
Display contrast can be adjusted by pressing and holding both the TIMER up and down arrow keys for 5 seconds. Use the “TIMER” Up and/or down arrow keys to change contrast from the preset. (See Figure 3-13)
NOTE: Contrast setting is from 0 to 15 with 15 being the darkest contrast setting. Unit default is 7.
Press the “Power On/Off” key to exit and save changes.
NOTE: Unit will turn off after 30 seconds if no key presses are made.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
TEMPTEMPTEMP
ON
TIMER
Figure 3-12. Press TEMP up and down arrow key to enter. Press TEMP arrow up or down to change scale.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
TEMPTEMPTEMP
ON
TIMER
Figure 3-13. Press TIMER up and down arrow key to enter. Press TIMER arrow up or down to change scale.
Page 21
Warming Drawer WWD30-2
Electronic Control Info.
3-10
LED Back Lighting Change:
Mode Entry:
Enter backlight setting preference by pressing and holding both “TEMP” and “TIMER” up arrow keys for 5 seconds. Current backlight setting will appear in display. (See Figure 3-14)
Operations:
Use “TIMER” up arrow key to select the various setting. Setting will be saved and recalled in the event of a power loss. Three settings available are Continuous mode Off (off bclt ALL, Continuous mode On, and ALL disabled. Default setting is Continuous Mode Off.
Continuous mode refers to the Sabbath mode where appliance is running continuously and backlight can be selected to be off or on.
Continuous mode On, refers to backlight on continuously at a reduced illumination level to conserve ` LED life. Outside of Sabbath mode, backlight works as normal based on drawer state at full illumination.
NOTE: Left side of display will show “On” continuously, and the right side of display will flash between “bclt” and
“Sab”.
Continuous mode Off, refers to backlight continuously off only in Sabbath mode. Outside of Sabbath mode, back­light works as normal based on drawer state at full illumination.
NOTE: Left side of display will show “Off” continuously, and the right side of display will flash between “bclt” and
“Sab”. Disabled mode, refers to backlight is always off regardless of operating mode.
NOTE: Left side of display will show “Off” continuously, and the right side of display will flash between “bclt” and
“ALL”.
Mode Exit:
Once back lighting has been set to desired state, press “Power On/Off” key and setting will be saved.
NOTE: If after 30 seconds of no additional key presses, mode will exit with last known state saved as LCD back
lighting preference.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
TEMPTEMPTEMP
ON
TIMER
Figure 3-14. Press TEMP & TIMER up arrow keys to enter. Press TIMER up arrow key to change settings.
Page 22
Electronic Control Info.
Warming Drawer WWD30-2
3-11
FIELD SERVICE MODE
Initiating Diagnostics Mode:
Note: Diagnostics mode can only be entered from “‘OFF” mode.
Mode Entry:
The Field Service mode can be entered by pressing and holding “Power On/Off” key, along with “MED” and “PROOF” keys simultaneously for 5 seconds. (See Figure 3-16)
Operations:
Once in this mode, software version will read in timer area. Revision will be displayed initially. (See Figure 3-16)
NOTE: If in Showroom Mode, temperature display will read “Sr” upon entering Field Service Mode. Display will
show Can-CEL then Sr will be displayed at 1 second intervals until Field Service Mode is canceled or times out. To use this feature, Showroom Mode must be canceled. See Showroom Mode for details.
To scroll through errors, use “TIMER” up or down arrow keys. Once you begin scrolling through errors, (i.e. “Err 10”, where “Err” is displayed in the temperature readout and “10” is displayed in the timer section). You can also scroll through additional control information parameters such as total hours used. (See Figure 3-17 & 3-19)
NOTES:
• Using the opposite “TIMER” up or down arrow key will reverse your previous order.
• To clear error codes logged, press and hold “TIMER” up and down arrow keys for 5 seconds, while in Field
Service Mode. See Troubleshooting, Section 5, for list of error codes and meanings.
• NOTE: Once you have made it through all errors and information parameters, revision of the control will again illuminate, starting the sequence over.
Functionality of fan, element and drawer switch can be tested by pressing the “TEMP” up or down arrow key. (See Figure 3-18)
Mode Exit:
Pressing the “Power On/Off key will cancel field service mode.
NOTE: If no other key presses are noted after 2 minutes, control will also exit field service mode and power down.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-16. Press Power On/Off, MED & PROOF Simultaneously to Enter Diagnostics Mode.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-17. Example of Error 10 displayed.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 3-18. Example of Element ON display.
Page 23
Warming Drawer WWD30-2
Electronic Control Info.
3-12
Enter Diagnostics rE (Sr if in showroom mode) 0018 (Meaning revision 1.8)
TIMER Err 10
TIMER Err 20
TIMER Err 30
TIMER Err 40
TIMER Err 50
TIMER Err 60
TIMER
Con (Control On Time) 1:60 = 16000 hr. (See note below)
TIMER
ELE (Element On Time) 95:00 = 950000 hr. (See note below)
TIMER
FAn (Fan On Time) 12:60 = 126000 hrs. use (See note below)
TIMER
Dor (Drawer Open/Close) 1:60 = 16000 cycles (See note below)
TIMER
119 (Current Temp) deg
key press TEMP DISPLAY TIMER DISPLAY
Figure 3-19. Field Service Mode.
Field Service Mode Unique Keystrokes:
NOTE: A colon (:) signifies the need to add two zeros (0) to the time shown. (i.e. 1:60 = 16000)
ERROR CODE TROUBLESHOOTING GUIDE:
ERROR CODE CAUSE TEST / ACTION
10
(Invalid Checksum Error)
20
(Thermistor Open)
30
(Thermistor Short)
40
(Element Sensing)
50
(Door Switch)
60
(Stuck Relay)
70
(Cable Open)
Incorrect checksum
Temperature >300ºF
Temperature <-30ºF
<5º change in temperature over 10 minutes of continuous call for heat.
Occurs only during preheat mode and
the door is closed.
Door switch closed when the keypad is
being operated or unit turned on.
Drawer temperature rises to 250ºF in
any mode/state.
Cable wires that activate element or
fan relays on power board are not
making connection.
Replace Control Board
In FSM (Field Service Mode), view temper-
ature as view by thermistor. Verify wiring
ok to element. Replace Thermistor if ok.
In FSM (Field Service Mode), view temper-
ature as view by thermistor. Verify wiring
ok to element. Replace Thermistor if ok.
If unit outdoors and temperature below
freezing point, instruct on unit limitations.
Verify Thermal Cutout is not open.
Verify Element is not open.
Replace TCO or Element if open.
Check operation of Door Switch with Ohm
meter. Replace if defective.
Check ambient Temp and installation.
Check TCO. Replace if opened.
Replace Relay Board.
Check connection of comm cable. Use
Figure 5-1 to check voltage and/or ohm
reading of cable. If open, replace.
NOTE: After correcting problem, errors code must be cleared. To clear error codes logged, press and hold
“TIMER” up and down arrow keys for 5 seconds, while in Field Service Mode.
Page 24
Electronic Control Info.
Warming Drawer WWD30-2
3-13
#814750 - Revision A - January, 2011
Diagnostic Mode
Resetting Error Codes in Diagnostic Mode
Sabbath Mode
Showroom Mode
HIGH Preset Change (Range of 80°F to 200°F)
(Press HIGH for 5 seconds again to save changes)
MED Preset Change (Range of 80°F to 200°F)
(Press MED for 5 seconds again to save changes)
LOW Preset Change (Range of 80°F to 200°F)
(Press LOW for 5 seconds again to save changes)
PROOF Preset Change (Range of 80°F to 110°F only)
(Press PROOF for 5 seconds again to save changes)
Temperature Scale Change Mode
Display Contrast Change Mode
LED Back Lighting Change Mode
TEMP ELE
Func
ON (Relay closed,
Element on)
TEMP ELE
Func
OFF (Relay Opens,
Element Off)
TEMP Fan
Func
ON (Relay closed, Fan
turns on)
TEMP Fan
Func
OFF (Relay Opens, Fan
turns Off)
TEMP Dor CLOS if Drawer Closed / OPEn If Drawer Open
key press TEMP DISPLAY TIMER DISPLAY “ON” INDICATOR
POWER ON/OFF
PROOF
MED
POWER ON/OFF
&
&
5 Seconds
5 Seconds
POWER ON/OFF
LOW
HIGH
&
&
5 Seconds
POWER ON/OFF
Followed by
HIGH
5 Seconds
POWER ON/OFF
Followed by
MED
5 Seconds
POWER ON/OFF
Followed by
LOW
5 Seconds
POWER ON/OFF
Followed by
PROOF
5 Seconds
MODE/FUNCTION KEY PRESSES to ENTER
Field Service Mode Functional Test Keystrokes:
Mode/Function Unique Keystroke:
&
5 Seconds
TEMP
&
5 Seconds
TIMER
&
5 Seconds
TEMP
&
5 Seconds
TIMER
TIMER
Page 25
Warming Drawer WWD30-2
Component Removal
4-2
COMPONENT ACCESS AND REMOVAL
This section explains how to access and remove components from a model WWD30 Warming Drawer.
An attempt has been made to arrange these procedures in such a way as to simulate which components would need to be removed first in order to gain access to other components. When following a component removal procedure, it may be necessary to reference another component removal procedure listed earlier in this section.
NOTE: Before continuing, please take note of the WARNINGS and CAUTIONS below.
- IF IT IS NECESSARY TO REMOVE A WARMING DRAWER UNIT FROM ITS INSTALLATION, REMEMBER THAT THEY ARE HEAVY AND COULD FALL RESULTING IN SERIOUS INJURY. PULLING A UNIT FROM ITS INSTALLATION SHOULD ONLY BE PERFORMED BY A TRAINED AUTHORIZED SERVICE TECHNICIAN OR INSTALLER.
- TO AVOID ELECTRIC SHOCK, POWER TO A WARMING DRAWER UNIT MUST BE DISCONNECTED WHENEVER ACCESSING AND/OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR OTHER ELECTRICAL COMPONENTS.
- Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
- The heating element can get very hot. To avoid personal injury use caution when servicing the unit, making sure the heater has cooled before working on or around it.
- If accessing components under the shell, the insulation must be properly reinstalled and positioned. Failure to do so may lead to damage to the surrounding cabinetry.
- Low voltage is used for most electronic control components. To avoid damaging the appliance, DO NOT apply 115V AC to electronic control components.
Page 26
Component Removal
Warming Drawer WWD30-2
4-3
Stainless Steel Drawer Box
The side flanges of the stainless steel drawer box rest on top of the drawer frame.
To remove the drawer box, open the drawer until the stops are engaged. Then, at the center of left and right side flanges lift drawer box. (See Figure 4-1)
Drawer Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Open drawer fully. Reach inside of unit cavity and disconnect control cable plug from jack located on inner back of unit.
4. Release the control cable from the cable hold down clips and place free section of control cable in draw­er.
5. The drawer can be separated from slide assemblies by moving drawer release up for the left side and down for the right and pull for the bottom. (See
Figures 4-2 & 4-3)
NOTE: It is usually better to leave the two sections of
the slides engaged until all three slides are released from their latch mechanisms. This way they can help support the drawer until all three can be separated.
6. The drawer assembly can now be removed from the Warming Drawer Cavity.
NOTE: Upon reassembly control cable must be
arranged to avoid damage to cable. (See Figure 4-4)
Drawer is heavy, use care not to damage drawer slides or scratch frame of unit.
Figure 4-1. Stainless Steel Drawer Box Removal
Figure 4-2. Left Drawer Release
Lift Here
Lift Here
Figure 4-3. Bottom Drawer Release
Pull
Figure 4-4. Control Cable Routing
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Page 27
Warming Drawer WWD30-2
Component Removal
4-4
Drawer Slide Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Stainless steel drawer box must be removed from drawer.
2. Remove drawer from unit. (Page 4-3)
3. Remove the nuts from the threaded studs that secure the drawer slide to the outside of the drawer frame. (See Figure 4-5)
4. Remove the drawer slide assemblies from the unit cavity by first positioning the slide so that the front screw is visible through the access hole in the slide and the rear screw is visible. Remove the screws and open the slide so the center screw is visible. Remove center screw. (See Figure 4-6)
5. Extract drawer slide from unit.
6. The center slide bracket is removed by lifting bracket up off the dowel pins pressed into the floor of unit cavity.
Drawer Front Panel Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Stainless steel drawer box must be removed from drawer.
2. Open drawer to the full open position.
3. Extract screws along the bottom inside edge of front panel. (See Figure 4-7)
4. Extract screws along the top flange of front panel.
5. Lift front drawer panel off the drawer mounting panel.
6. Handle mounting screws are accessible from the inside face of the front panel. Remove the drawer handle by extracting the mounting screws that secure the handle and spacer blocks to front panel.
7. Once drawer front has been removed, door mounting panel can be removed by extracting the screws from face of the drawer mounting panel. (See Figure 4-8)
Figure 4-7. Drawer Front Panel Removal
Figure 4-8. Door Mounting Plate Removal
Extract Screws
Extract Screws
Extract Screws From Inside Flange
Figure 4-5. Drawer Slide Removal
Bottom of Drawer Shown
Figure 4-6. Drawer Slide Removal
Interior of Unit Cavity Shown
Remove Screws
Remove Nuts
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Page 28
Component Removal
Warming Drawer WWD30-2
4-5
Control Cable Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Unplug control cable from jack in lower back of draw­er cavity and carefully slide cable from under clips. (See Figure 4-11a)
4. Remove front drawer panel and drawer mounting panel. (Page 4-4) Release cable from the clip(s) located on the back of drawer. (See Figure 4-9)
5. Remove the cable guard by extracting the four nuts securing it to the right side of drawer. Push the cable grommet fitting and control cable through hole on the right back face of drawer. (See Figure 4-10)
6. From inside of drawer frame assembly, disconnect control cable from control board. (See Figure 4-11b) Pull control cable out of drawer assembly.
Control Panel Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. To remove the control panel, front drawer panel and door mounting panel will need to be removed. (Page
4-4)
4. Disconnect all electrical leads from control panel.
5. Extract the control panel mounting screws from bracket. (See Figure 4-12) Lift control panel from drawer frame assembly.
Thermistor Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Follow procedure to remove control panel. (above)
3. Carefully remove yellow insulation to get access to thermistor.
4. Remove the (2) screws that fasten the thermistor to back of drawer frame.
Figure 4-9. Drawer Bottom with Control Cable
Control Cable Hook-ups and Routing
Figure 4-12. Control Panel Removal
Remove Cable From
Under Clip(s)
Hole for Control Cable
Remove Screws
Unplug Control Board
Figure 4-10. Control Cable Hook-ups and Routing
Figure 4-11a. Figure 4-11b.
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Page 29
Warming Drawer WWD30-2
Component Removal
4-6
Figure 4-13. Drawer Switch Removal
Switch
Drawer Switch Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Front drawer panel and door mounting panel will need to be removed. (Page 4-4)
4. From inside of drawer frame, disconnect electrical leads from drawer switch. (See Figure 4-13)
5. Depress retaining clip on side of switch and push through drawer frame.
Drawer Frame Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Remove front drawer panel and drawer mounting panel. (Page 4-4)
4. Remove control cable guard by extracting the four nuts securing it to right side of drawer. Push cable grommet fitting and control cable through hole on right back face of drawer, far enough to remove cable grommet. (See Figure 4-14)
NOTE: To get enough slack in cable to remove grom-
met, you may need to slide cable from under clamp in back of drawer.
5. From inside of drawer frame assembly, disconnect control cable from control board. (See Figure 4-11b) Carefully pull control cable out of drawer assembly.
6. Remove drawer frame clamp screws from clamps. Slide clamp up to free from tabs and remove from drawer frame. (See Figure 4-15)
7. Lift drawer frame off drawer assembly. If drawer frame is being replaced, control board, drawer switch, thermistor, insulation and factory communica­tion cable will need to be transferred to the new drawer frame.
NOTE: During reassembly, care must be taken to verify
drawer assembly tabs fit into slots in lower back of drawer frame.
Figure 4-15. Drawer Frame Removal
Figure 4-14. Control Cable Hook-ups and Routing
Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Page 30
Component Removal
Warming Drawer WWD30-2
4-7
Figure 4-16. Fan Baffle Screws
Fan Assembly Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Remove drawer from unit. (Page 4-3)
4. Lift center slide assembly out of unit and set aside.
5. Remove (4) screws from fan baffle plate and set plate aside for reassembly. (See Figure 4-16)
6. Disconnect fan wires and feed through insulator. (See
Figure 4-17)
7. Remove (3) screws supporting fan assembly and remove fan assembly. (See Figure 4-18)
Power Board Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Remove drawer from unit. (Page 4-3)
4. Lift center slide assembly out of unit and set aside.
5. Remove (4) screws from fan baffle plate and set plate aside for reassembly. (See Figure 4-16)
6. Disconnect wires from power board being careful to mark or label wires to insure proper wiring of new board. (See Figure 4-19)
7. Unplug control cable jumper from jack in power board.
8. Gently pull board off (4) expanding mandrels that support power board.
Figure 4-18. Fan Mounting Screws
Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURE.
N
/ L2
L
1
HTR
FAN
Figure 4-17. Fan Wiring
N
/ L2
L
1
HTR
FAN
Figure 4-19. Power Board
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Page 31
Warming Drawer WWD30-2
Component Removal
4-8
Figure 4-22. Thermal Cut-Out Plate Nuts
Thermal Cut-Out Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Remove drawer from unit. (Page 4-3)
4. Lift center slide assembly out of unit and set aside.
5. Remove (4) screws from fan baffle plate and set plate aside for reassembly. (See Figure 4-16)
6. Disconnect fan wires and feed through insulator. (See Figure 4-17)
7. Remove (3) screws supporting fan assembly and remove fan. (See Figure 4-18)
8. Unplug element by depressing tab and pulling free. (See Figure 4-20 blow-up)
9. Unplug thermal cut-out wires from thermal cut-out and feed element plug and thermal cut-out wires through insulators toward power board. (See Figure
4-20)
10. Unplug control cable jumper from jack on power board and release from wire management clip. (See
Figure 4-21)
11. Remove (3) nuts that support thermal cut-out plate. (See Figure 4-22)
12. Thermal cut-out is held to the plate with rivets. These will need to be drilled out if thermal cut-out is to be replaced. (See Figure 4-23)
Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Figure 4-20. Thermal Cut-Out Wiring
Thermal Cut-Out
Remove Nuts
Figure 4-23. Thermal Cut-Out Plate Removed
Thermal Cut-Out
Ta b
HTR
FAN
Figure 4-21. Control Cable Jumper
Control Cable
Jumper Jack
Page 32
Component Removal
Warming Drawer WWD30-2
4-9
Front Gasket Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Remove drawer from unit. (Page 4-3)
4. Lift center slide assembly out of unit and set aside.
5. Remove (5) front collar screws and lift off collar. (Figure 4-24) When collar is removed, reinstall top two collar screws. (See Figure 4-25)
6. Remove (2) screws holding internal support channel to top cover (See Figure 4-26), and then remove front collar frame components. (See Figure 4-27)
7. Remove top cover screws and lift off cover. (See
Figures 4-28 & 4-29)
8. Remove (4) screws from front bottom of warming drawer cavity. These must be removed to allow the unit bottom cover to be flexed away from the cavity to allow room for old gasket to be removed and new gasket to be installed. (See Figure 4-30)
NOTE: When reassembling unit do not forget to install
screw support spacers. (See Figure 4-31 blow-up) These provide necessary support to prevent dam­age to front collar when installation screws are rein­stalled.
Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Figure 4-28. Top Cover Screws (top & side)
Figure 4-24. Front Collar Screws
Figure 4-27. Front Collar Pieces
Figure 4-25. Front Collar off Screws In
Reinstall top two
collar screws.
Figure 4-26. Top Cover to Support Channel Screws
Remove (2) support
channel screws
Do not loose (2) front collar screw spacers. They will need to be reinstalled or frame will be damaged when unit reinstalled.
Screw Spacers
Figure 4-29. Top Cover Screws (back)
Page 33
Warming Drawer WWD30-2
Component Removal
4-10
Heating Element Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Remove drawer from unit. (Page 4-3)
4. Remove (6) screws holding the element assembly to the top of cavity. (See Figure 4-32)
NOTE: Front 2 screws can only be seen by looking up
behind element t-channel.
5. (See Figure 4-33) (1) Unplug power connector molex from element connector, (2) depress two tabs on sides of element molex, (3) push the element molex out of opening.
6. Once element assembly is removed the element can be replaced.
• Metal edges may be sharp. Use caution when
servicing unit to avoid personal injury.
• Element may be hot. Allow sufficient time for element cooling before attempting this repair.
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Figure 4-30. Front Bottom Cavity Screws Figure 4-31. Screw Support Spacer Placement
Screw Spacers
Figure 4-32. Element Removal Screws
Figure 4-34. Element Assembly Removed
1
2
3
Figure 4-33. Heating Element Plug
Element Removal
Screws
Page 34
Component Removal
Warming Drawer WWD30-2
4-11
FAN
Remove nut
Disconnect from power board
Power Cord Removal
NOTE: See all Warnings and Cautions at beginning of
Section.
1. Disconnect Electrical Supply to Unit.
2. Stainless steel drawer box must be removed from drawer.
3. Remove drawer from unit. (Page 4-3)
4. Lift center slide assembly out of unit and set aside.
5. Remove (4) screws from fan baffle plate and set plate aside for reassembly. (See Figure 4-16)
6. Disconnect wires from power board being lead.
(See Figure 4-35)
7. Remove the large nut securing the power cord strain relief to the unit. (See Figure 4-35)
8. Remove the power cord from the unit.
Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
ELECTRICAL SHOCK HAZARD - DISCONNECT ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT­ING THE FOLLOWING PROCEDURES.
Figure 4-35. Power Cord Removal
Page 35
Warming Drawer WWD30-2
Troubleshooting Guides
5-2
TROUBLESHOOTING GUIDES
This section of the manual contains the General Troubleshooting Guide which will help the Service Technician trou­bleshoot a Wolf WWD30 unit. Following the General Troubleshooting Guide is the Electronic Control System Test Procedures to be performed after going through the General Troubleshooting Guide and determining that the elec-
tronic control system is suspect.
How to Use the General Troubleshooting Guide
The Table of Contents below indicate how the General Trouble Shooting Guide on the following pages is arranged. Locate the description of the problem that the unit is experiencing from the Table of Contents, below. To the left of the problem description in the Table of Contents is a letter. On the page indicated, locate that letter in the left col­umn of the General Troubleshooting Guide. The center column of the General Troubleshooting Guide will identify the possible causes for the problem. The information in the right column of the General Troubleshooting Guide will explain what tests to perform and/or what action to take to correct the problem.
Before continuing, take note of the WARNINGS and CAUTIONS at the bottom of this page.
General Troubleshooting Guide Table of Contents
Page #
Error Codes Troubleshooting Guide .............................................................................................................................................. 5-3
Field Service Mode ....................................................................................................................................................................... 5-4
A. Unit does not function at all ................................................................................................................................................... 5-5
B. No Heat at Any or All Settings ............................................................................................................................................... 5-5
C. No Heat at PROOF Setting only ........................................................................................................................................... 5-5
D. Excessive Heat at Any or All Settings .................................................................................................................................... 5-5
E. Excessive Condensation in Drawer ....................................................................................................................................... 5-5
F. Food Dries Out ...................................................................................................................................................................... 5-6
G. One or more LCD (ON/OFF indicator, Temp. Range Indicator or segment(s) of Temp. Readout) does not illuminate ....... 5-6
H. LCD is black ........................................................................................................................................................................... 5-6
I. One or more LCD (ON/OFF indicator, Temp. Range Indicator or segment(s) of Temp. Readout) illuminated Constantly .. 5-6
J. Drawer Does Not Slide Smoothly .......................................................................................................................................... 5-6
K. Drawer Does Not “Pull In”........................................................................................................................................................ 5-6
- IF REMOVING A WARMING DRAWER FROM ITS INSTALLATION FOR TROUBLESHOOTING PURPOSES,
REMEMBER THAT THE UNIT IS HEAVY AND COULD TIP AND/OR FALL WHEN PULLED FORWARD BEYOND THE ANTI-TIP COMPONENTS, RESULTING IN SERIOUS INJURY OR DEATH.
- TO AVOID ELECTRIC SHOCK, POWER TO THE UNIT MUST BE DISCONNECTED WHENEVER ACCESS-
ING AND/OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR OTHER ELECTRICAL COMPONENTS. IF THE UNIT IS PLUGGED IN, BUT HAS NOT BEEN SWITCHED ON BY PRESSING THE UNIT ON/OFF KEY, 115 VOLTS AC IS STILL PRESENT AT THE POWER BOARD.
- Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
- The heating element can get very hot. To avoid personal injury use caution when servicing the unit, making sure the heater has cooled before working on or around it.
- If accessing components under the shell, the insulation must be properly reinstalled and positioned. Failure to do so may lead to damage to the surrounding cabinetry.
- Low voltage is used for most electronic control components. To avoid damaging the appliance, do NOT apply 115V AC to electronic control components.
Page 36
Troubleshooting Guides
Warming Drawer WWD30-2
5-3
ERROR CODE TROUBLESHOOTING GUIDE:
ERROR CODE CAUSE TEST / ACTION
10
(Invalid Checksum Error)
20
(Thermistor Open)
30
(Thermistor Short)
40
(Element Sensing)
50
(Door Switch)
60
(Stuck Relay)
70
(Cable Open)
Incorrect checksum
Temperature >300ºF
Temperature <-30ºF
<5º change in temperature over 10 minutes of continuous call for heat.
Occurs only during preheat mode and
the door is closed.
Door switch closed when the keypad is
being operated or unit turned on.
Drawer temperature rises to 250ºF in
any mode/state.
Cable wires that activate element or
fan relays on power board are not
making connection.
Replace Control Board
In FSM (Field Service Mode), view temper-
ature as view by thermistor. Verify wiring
ok to element. Replace Thermistor if ok. In FSM (Field Service Mode), view temper­ature as viewed by thermistor. Verify wiring
ok to element. Replace Thermistor if ok.
If unit outdoors and temperature below
freezing point, instruct on unit limitations.
Verify Thermal Cutout is not open.
Verify Element is not open.
Replace TCO or Element if open.
Check operation of Door Switch with Ohm
meter. Replace if defective.
Check ambient Temp and installation.
Check TCO. Replace if opened.
Replace Relay Board.
Check connection of comm cable. Use
Figure 5-1 to check voltage and/or ohm
reading of cable. If open, replace.
P1 - Blue / 17VAC
P2 - Orange / 17VAC
P3 - White / Cable Gnd
P4 - Green / Relay Supply Voltage
P5 - Red / Fan Relay Actuation
P6 - Black / Heater Relay Actuation
Figure 5-1 Communication Cable Pin Configuration
NOTE: After correcting problem, errors must first be cleared in Field Service Mode before controls will refresh error
display. To clear error codes logged, press and hold “TIMER” up and down arrow keys for 5 seconds, while in Field Service Mode.
Page 37
Warming Drawer WWD30-2
Troubleshooting Guides
5-4
FIELD SERVICE MODE
Initiating Diagnostics Mode:
Note: Diagnostics mode can only be entered from a unit “‘OFF” state (Not currently heating).
Mode Entry:
The Field Service mode can be entered by pressing and holding “Power On/Off” key, along with “MED” and “PROOF” keys simultaneously for 5 seconds. (See Figure 5-2)
Operations:
Once in this mode, software version will read in timer area. Revision will be displayed initially. (See Figure 5-2)
NOTE: If unit is in Showroom Mode, temperature display will read “Sr” upon entering Field Service Mode. Cycling
of fan, element and drawer is non-functional. Display will show Can, CEL then Sr will be displayed at 1 second per word then repeat until Field Service Mode is canceled or times out. To use this feature, Showroom Mode must be canceled. See Showroom Mode for details (Section 3).
To scroll through errors control has seen, use “TIMER” up or down arrow keys. Once you begin scrolling through errors, (i.e. “Err 10”, where “Err” is displayed in the temperature readout and “10” is displayed in the timer section). You can also scroll through additional control information parameters such as total hours used. (See Figure 5-3 & 5-4)
NOTE: Using the opposite “TIMER” up or down arrow key will reverse your previous order. NOTE: To clear error codes logged, press and hold “TIMER” up and down arrow keys for 5 seconds, while in
Field Service Mode. See Troubleshooting Guide page 5-3, for list of error codes and meanings.
NOTE: Once you have made it through all errors and information parameters, revision of the control will again illu-
minate, starting the sequence over.
Mode Exit:
Pressing the “Power On/Off key will cancel field service mode.
NOTE: If no other keypresses are noted after 2 minutes, control will also exit field service mode and power down.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 5-2. Press Power On/Off, MED & PROOF Simultaneously to Enter Diagnostics Mode.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 5-3. Example of Error 10 displayed.
TIMER
PROOF
LOW
PRESETS
HIGH
MED
TEMP
POWER ON/OFF
PROOF
F
TEMPTEMPTEMP
ON
TIMER
Figure 5-4. Example of Element ON display.
Page 38
Troubleshooting Guides
Warming Drawer WWD30-2
5-5
#814750 - Revision A - January, 2011
PROBLEM POSSIBLE CAUSE TEST / ACTION
A. Unit Does Not Function at All
B. No Heat at Any or All
Settings
C. No Heat at PROOF Setting
Only
D. Excessive Heat at Any or All
Settings
E. Excessive Condensation in
Drawer
No Power to Unit
No power from power board
Disconnected Cable or Broken Wiring
No Power to Unit
Unit Switched OFF or no keypress made within 20 seconds after turning on.
Electronic Control System Fault
Disconnected or Broken Wiring
Defective Heating Element
Defective Thermal Cutout (TCO)
High Room Ambient
Electronic Control System Fault
Defective Heating Element
Defective Thermal Cut-Out
Defective Thermistor
Check Offset in FSM (Default is “0”)
Temperature Setting too High
Uncovered Food in Drawer
Liquid in Drawer
Check power to unit. Plug unit in, switch supply circuit breaker to ON position or replace fuse if defective.
Check for power from power board. Replace if no voltage present.
Check for power from power board. Replace if no voltage present.
Check power to unit. Plug unit in, switch supply circuit breaker to ON position or replace fuse if defective.
Switch unit ON and set to desired temperature.
See Electronic Control Section for operational information. After turning unit on selection must be made within 20 seconds or unit turns off.
Check all electrical connections and wires. Reconnect or repair wiring.
Check heater for 16.9 Ohms (±10%) or open. Replace if outside range or open.
Check resistance of thermal cutout. Replace if open.
If room ambient exceeds temperature setting of warming drawer, it will not work. Instruct Customer.
See Electronic Control System Test Procedures following General Troubleshooting Guide.
Check heater for 16.9 Ohms (±10%). Replace if outside range or open.
Check resistance of thermal switch when hot (heat with lighter). Replace if it remains closed.
Check resistance at room temperature (70°F / 21°C). Resistance should be 12.9K Ohms ±10%. Replace if out of range or open.
NOTE: See Section 6 for further Thermistor Testing Information.
Adjust offset ±30 in FSM.
Reduce temperature setting.
Cover food with lid or aluminum foil.
Remove liquid. If outdoors, verify door shuts.
General Troubleshooting Guide
Page 39
Warming Drawer WWD30-2
Troubleshooting Guides
5-6
PROBLEM POSSIBLE CAUSE TEST / ACTION
F. Food Dries Out
G. One or More LCD does not
Illuminate
H. LCD display is black
I. One or More LCD Illuminated
Constantly
J. Drawer Does Not Slide
Smoothly
K. Drawer Does Not “Pull In”
Temperature Setting too High
Food Uncovered
Food in Drawer too Long
No Power to Unit
Unit Switched OFF
(NOTE: See Automatic Shut-off Information in Section 3.)
Door Switch Faulty
Electronic Control System Fault
Disconnected or Broken Wiring
Contrast set to low
Contrast is set to high
LCD exposed to direct sunlight
Electronic Control System Fault
Drawer Overloaded (Exceeding 80 lbs. limit) or Unbalanced Load
Drawer Glides Misaligned
Drawer Frame Skewed
Drawer Glides Defective
Self-Close Feature Broken
Slide Mounting Screw is Loose
Something Fell Behind Drawer
Reduce temperature setting.
Cover food with lid or aluminum foil.
Food in drawer longer then 4 hrs. will tend to dry out. Instruct Customer. (Timer default is 4 hrs.)
Check power to unit. Plug unit in, switch supply circuit breaker to ON position or replace fuse if defective.
Switch unit ON and set to desired temperature.
Use ohm meter to verify switch operation. Replace switch if faulty.
See Electronic Control System Test Procedures following General Troubleshooting Guide.
Check all electrical connections and wires. Reconnect or repair wiring.
Adjust contrast level
Adjust contrast Level
Allow to cool. Block from direct sunlight. Instruct Customer.
See Electronic Control System Test Procedures following General Troubleshooting Guide.
Reduce and/or redistribute drawer contents.
Open drawer fully and close, then reopen and check operation. If problem persists, see Drawer Frame Skewed and Drawer Glides Defective, below.
Remove drawer tub and inspect frame. If skewed, straighten.
Remove drawer tub and inspect glide operation. Replace if defective.
Replace Slide. (Wolf Recommends to replace
ALL slides at same time)
Tighten or Replace Screw
Remove Obstruction
Page 40
Warming Drawer WWD30-2
Technical Data
6-2
TEMPERATURE INFORMATION
Temp. Setting Preset Temp. Approximate Preheat TimeTemp. Setting Range
HIGH
MEDIUM
LOW
PROOF
200°F
160°F
120°F
85°F
20 Minutes
15 Minutes
8 Minutes
0 - 5 Minutes
80°F - 200°F
80°F - 200°F
80°F - 200°F
(Recommended 145°F - 159°F)
80°F - 110°F
(Recommended 80°F - 100°F)
HEAT ELEMENT INFORMATION
Domestic: 850 Watts
16.9 ± 10% Ohms
NOTE: For electronic control low voltage information, see Wiring Schematic in this manual.
THERMAL CUT-OUT (TCO) INFORMATION (Auto Reset)
Open Temperature - 213.8°F ±37.4°F (101°C ± 3°C)
Close Temperature - 158°F ± 40.1°F (70°C ± 4.5°C)
POWER BOARD IDENTIFICATION (Domestic vs. International)
Domestic (120VAC 50/60Hz) - Yellow Label
International (240VAC 50/60Hz) - Green Label
THERMISTOR TESTING INFORMATION
TEMPERATURE (
± 10%)
OHM READING (
± 10%)
65°F (18.3°C) 14.8K
68°F (20°C) 13.5K 70°F (21.1°C) 12.9K 75°F (23.9°C) 11.3K
International: 850 Watts
64.4 - 74.6 Ohms
Page 41
Warming Drawer WWD30-2
Wire Diagrams
7-2
WWD30 WIRING DIAGRAM (Domestic)
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