APW Wyott SM-50-4ULS User manual

BUILT-IN ROUND WELL WARMERS WITH
THERMOSTAT CONTROL
(Insulated & Non-Insulated)
MODELS:
SM-50-4ULS, SM-50-4DULS, SM-50-7DS, SM-50-7ULS,
SM-50-7DULS, SM-50-11S, SM-50-11DS, SM-50 11DULS
OWNERS MANUAL
2M-Z24236 REV A (03-22)
is a registered trademark of APW Wyott®, A Middleby Company. All rights reserved.
This manual includes material related to installation, use , cleaning, and care. Exploded view[s], as well as any available
parts list[s] and wiring diagram[s] pertaining to the unit[s] covered by this manual are also included.
This manual must be read and understood by all persons using or installing this appliance. Contact your APW Wyott
dealer if you have any questions concerning installation, use, or maintenance of this equipment.
DO NOT DISCARD THIS MANUAL.

LIMITED EQUIPMENT WARRANTY
APW warrants to the original purchaser of new APW's products to be
free from defects in material or workmanship,undernormal and proper
use and maintenance service as specified by APW and upon proper
installation and start-up in accordance with the instructions
supplied with each APW unit. APWs’ obligation under this warranty is
limited to a period of one [1] year from the date of original installation, or
eighteen [18] months from original invoice date, whichever occurs first.
Defects that occur as a result ofnormal use,within the time period and
limitations defined in this warranty, will at APWs’ discretion have the parts
replaced or repaired by APW or a APWs-authorized service agency.
THIS WARRANTY IS SUBJECT TO ALL LISTED CONDITIONS
Repairs performed under this warranty are to be performed by an
APW authorized service agency. APW will not be responsible for
charges incurred or service performed bynon-authorized repair
agencies. Inall cases, the nearest APW-authorized service agency must be
used. APW will be responsible for normal labor charges incurred in
the repair or replacement ofa warrantied product within 50miles
(80.5 km) of an authorized service agency. Time and expense charges
for anything beyond that distance will be the responsibility of the owner.
All labor will need to be performed during regular service hours. Any
overtime premium will be charged to the owner. For all shipments
outside the U.S.A. and Canada, please see the International Warranty
for specific details. Itisthe responsibility ofthe owner to inspect
and report any shipping damage claims, hidden or otherwise, promptly
following delivery. No mileage or travel charges will be honored on any
equipment that is deemed portable. In general, equipment with a cord
and plug weighing less than 50 lb. (22.7 kg) is considered portable and
should be taken or shipped to the closest authorized service agency,
transportation prepaid.
CONTACT
Should you require any assistance regarding the operation or maintenance
of any APW Manufacturing; phone or email our service department. Inall
correspondence provide the model number and serial number of the unit
needing service;include the voltage or gas type.
Normal Business Hours: 8:00 a.m. to4:30 p.m. Central
Telephone: [phone] Tech Service Option 2
Email: [email protected]
www.apwwyott.com
WARRANTY EXCLUSIONS
THE FOLLOWING WILL NOT BECOVERED UNDER WARRANTY.
APWs’ sole obligation under this warranty is limited to either repair
or replacement parts, subject tothe additional limitations
detailed below. This warranty neither assumes nor authorizes any
person to assume obligations other than those expressly
covered bythis warranty.
• Any product which has not been used, maintained, orinstalled in
accordance with the directions published in the appropriate
installation sheet and/or owner’s manual, including incorrect gas or
electrical connection. APW is not liable for any unitwhich has been
mishandled, abused, misapplied, subjected to harsh chemicals,
modified by unauthorized personnel, damaged by flood, fire, or other
acts of nature [or God], or which have an altered or missing serial
number.
• Installation, labor, and job checkouts, calibration of heat controls,
air and gas burner/bypass/pilot adjustments, gas or electrical system
checks, voltage and phase conversions, cleaning of equipment, or
seasoning of griddle surface.
•Replacement of fuses or resetting of circuit breakers, safety
controls, orreset buttons.
•Replacement of broken or damaged glass components, quartz
heating elements, and light bulbs.
•Labor charges for all removable and consumable parts in gas
charbroilers and hotplates, including but notlimited to burners,
grates, and radiants.
•Any labor charges incurred by delays, waiting time, or operating
restrictions that hinder a service technician’s ability to perform
service.
•Replacement of parts that fail orare damaged due to normal wear
or labor for replacement of parts that can be replaced during a daily
cleaning routine, such as but notlimited to silicone belts, PTFE non-
stick sheets, control labels, knobs, bulbs, fuses, quartz heating
elements, baskets, racks, and grease drawers.
•Any economic loss of business or profits.
•Non-OEM parts. Use of non-OEM parts without APWs’ approval
will void the warranty.
•Units exceeding one [1] yearfrom original installation date, or more
than eighteen [18] months from original invoice date, whichever
comes first.
ADDITIONAL WARRANTIES
• Specific/chain-specific equipment may have additional and/or
extended warranties.
The foregoing warranty is in lieu of any and all other warran�es
expressed or implied and cons�tutes the en�re warranty.
xi

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
1
WARRANTY xi
FEATURES & OPERATING CONTROLS 2
PRECAUTIONS & GENERAL INFORMATION 3
AGENCY LISTING INFORMATION 3
INSTALLATION 4-6
OPERATION 7-8
MAINTENANCE INSTRUCTIONS 9
CLEANING INSTRUCTIONS 10-11
TROUBLESHOOTING SUGGESTIONS 12
WIRING DIAGRAM 12-13
EXPLODED VIEW & PARTS LIST 14-15
CUSTOMER SERVICE DATA 16
Thank You for purchasing this APW Wyott appliance.
Proper installation, professional operation and consistent maintenance of this appliance will ensure that it
gives you the very best performance and a long, economical service life.
This manual contains the information needed to properly install this appliance, and to use and care for the
appliance in a manner which will ensure its optimum performance.
TABLE OF CONTENTS
INTRODUCTION
SPECIFICATIONS
MODEL VOLTS AMPS WATTS POWER SUPPLY CORD
SM-50-4S, DS 120 VAC 1ø 6.9A 825W
NOT SUPPLIEDSM-50-7S, DS 208 VAC 1ø 3.0A 620W
SM-50-11S, DS 240 VAC 1ø 3.4A 825W

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
2
FEATURES & OPERATING CONTROLS
A. THERMOSTAT
1. On THERMOSTATICALLY CONTROLLED warmers, power is applied
to the heating element according to the control knob position and the
actual temperature at the temperature sensing thermobulb.
2. The desired temperature is controlled by rotating the TEMPERATURE
CONTROL KNOB. The knob has a numeric scale, where higher
numbers correspond to higher temperature.
3. On warmers equipped with an INDICATOR LIGHT, the light will glow
when the thermostat is calling for heat
(i.e. the element is energized).
4. The TEMPERATURE CONTROL KNOB will rotate approximately 300º,
and will reach a “stop” at both ends. The OFF position is marked.
NOTE: The dial position is an indication of the temperature
setting. Actual temperature will vary depending upon the type of
product and food consistency.
B. MOUNTING
1. Top-mounted built-in warmers are be equipped with E-Z LOCK,
uniquely designed turnout tabs which help secure the warmer top
ange to the countertop.
2. See the Installation Instructions, supplied with the particular appliance,
for details.
C. DRAINS
1. Models with a “D” (e.g. SM-50-11DS) have drains for each well,
with each well having an individual drain valve.
2. Models that have the individual drain lines manifolded together
(custom installation), with a single drain valve for the entire
manifold.
D. AUTOFILL
1. On AUTOFILL units, water level is automatically fed into the
“master” pan whenever that pan’s thermostat is ON.
2. Water level is sensed by a WATER LEVEL PROBE.
W
a
t
e
r
L
e
v
e
l
WATER LEVEL
SENSOR
IL2694
IL2694
INDICATOR
LIGHT
TEMPERATURE
CONTROL
KNOB
IL2468-011B-2
E-Z LOCK

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3
PRECAUTIONS AND GENERAL INFORMATION
E6070
AGENCY LISTING INFORMATION
Refer to the product nameplate for the specic appliance for agency
listings. In general:
This appliance conforms to NSF Standard 4 for sanitation only if
installed in accordance with the supplied Installation Instructions.
UL Listed warmers are UListed under UL File E6070.
Underwriters Laboratory recognized ( ) warmers (UL File E6070) -
Since the warmer is only a single component of a complete installation,
the nished installation of an unit requires additional evaluations to
Underwriters Laboratory standards.
STD 4
UL Listed Warmers
UL Recognized Warmers
E6070
WARNING:
SHOCK HAZARD
All servicing requiring
access to non-insulated
electrical components must
be performed by a factory
authorized technician.
DO NOT open any access
panel which requires the use
of tools. Failure to follow this
warning can result in severe
electrical shock.
CAUTION:
RISK OF
DAMAGE
DO NOT connect or energize
this appliance until all
installation instructions are
read and followed. Damage
to the appliance may result
if these instructions are not
followed.
CAUTION:
HOT SURFACE
Exposed surfaces can be hot
to the touch and may cause
burns.
This appliance is intended for use in commercial establishments only.
This appliance is intended to hold pre-heated 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.
This appliance is not jet stream approved. Do not direct water jet
or steam jet at this appliance, or at any control panel or wiring. Do
not splash or pour water on, in or over any controls, control panel or
wiring.
Exposed surfaces of this appliance can be hot to the touch and may
cause burns.
Do not operate this appliance if the control panel is damaged. Call
your Authorized APW Wyott Service Agent for service.
The technical content of this manual, including any wiring diagrams,
schematics, parts breakdown illustrations and/or adjustment
procedures, is intended for use by qualied technical personnel.
Any procedure which requires the use of tools must be performed by a
qualied technician.
This manual is considered to be a permanent part of the appliance.
This manual and all supplied instructions, diagrams, schematics,
parts breakdown illustrations, notices and labels must remain with the
appliance if it is sold or moved to another location.
This appliance is made in the USA. Unless otherwise noted, this
appliance has American sizes on all hardware.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
4
NOTE: DO NOT discard
the carton or other packing
materials until you have
inspected the appliance for
hidden damage and tested it
for proper operation.
Refer to SHIPPING DAMAGE
CLAIM PROCEDURE on the
inside front cover of this
manual.
WARNING:
RISK OF INJURY
Installation procedures must
be performed by a qualied
technician with full knowledge
of all applicable electrical and
plumbing codes. Failure can
result in personal injury and
property damage.
CAUTION
FIRE HAZARD
Avoid storing ammable or
combustible materials in, on
or near the appliance.
IMPORTANT: For warmers
installed in plastic counter
tops, the counter material
must be protected from the
heat of the warmer in order
to prevent discoloration and/
or deterioration. E-Z Lock are
not suitable for this purpose.
The installer should contact
the manufacturer or distributor
of the countertop material for
specic instructions.
IMPORTANT: E-Z Lock
Extension Kits must be used
ONLY with UL Listed warmers
approved for installation in
wood counter tops. Refer to
the Installation Instructions
provided with the warmer.
UNPACKING & INSPECTION
Carefully remove the appliance from the carton. Remove all
protective plastic lm, packing materials and accessories from the
Appliance before connecting electrical power or otherwise performing
any installation procedure.
Carefully read all instructions in this manual and the Installation
Instruction Sheet packed with the appliance before starting any
installation.
Read and understand all labels and diagrams attached to the
appliance.
Carefully account for all components and accessories before
discarding packing materials. Store all accessories in a convenient
place for later use.
INSTALLATION NOTES
1. Installation and start up of built-in warmers MUST be performed
by an authorized installation company.
2. It is the RESPONSIBILITY OF THE INSTALLER to verify that
this warmer installation is in compliance with the specications
listed in this manual and on the specication sheet provided.
3. It is the RESPONSIBILITY OF THE INSTALLER to check with
the AUTHORITY HAVING JURISDICTION, in order to verify
that this warmer installation is in compliance with local code
requirements.
4. Water supply and drain installation must meet all applicable
local, state and federal plumbing codes and ordinances.
5. Refer to Installation Instructions included with the warmer for
Underwriters Laboratories conditions of acceptability, electrical
requirements and other installation concerns.
BUILT-IN WARMERS
1. This is a GENERAL GUIDE. For specic cutout dimensions
and other installation details, refer to the Installation Instructions
supplied with the warmer.
2. Cutout dimensions for warmer units and control panels are
listed on the Installation Instructions provided with the warmer.
3. Verify style of control panel (e.g oval, rectangular) before
making cutout.
4. Units that are being connected by a manifold system, all units MUST
be installed on a level surface and with each other. If the units are
being installed on a mobile cart, the cart MUST be positioned on a
level surface when put in use.
NOTE: Cutout dimensions are di󰀨erent for insulated and non-insulated
units, control panels, for UL LISTED units and UL Recognized units,
and for wood and metal counters. Verify the dimensions are correct for
the installation before making the cutout. Specic cutout specications
are list on the installation sheet included with the unit.
INSTALLATION

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
5
INSTALLATION continued
4. For “top-mounted” warmers (i.e. warmers mounted from above the
counter top):
a. Verify that provided sealants are applied to the underside
of the warmer top ange prior to setting the unit into the cutout.
b. After installation, verify that the tabs on the E-Z Lock are turned
out to lock the warmer into the counter
c. Apply a thin bead of food-grade silicone sealant around the
ange to seal it to the counter.
d. E-Z Lock extension kits are available for installing warmers
in counter tops where the standard E-Z Lock would not
normally reach. The extension kit will adapt to counter
tops up to 1¾” thick.
ELECTRICAL INSTALLATION
1. Refer to the product nameplate. Verify the electrical service power.
Voltage and phase must match the nameplate specications.
Wiring the warmer to the wrong voltage can severely damage the
unit or cause noticeably decreased performance.
2. Available electrical service amperage must meet or exceed the
specications listed on the specication sheet provided with the
warmer.
3. Warmer and control unit must be connected to an appropriate
building ground. Ground connection will be marked “GND” or
” “ .
NOTE: Wire gauge, insulation type and temperature rating , as well as
type, size and construction of conduit, must meet or exceed applicable
specications of local codes and of the National Electrical Code.
NOTE: Damage caused
by leaks due to improper
installation is NOT covered by
warranty.
CAUTION:
SHOCK HAZARD
The ground lug of this
appliance must be connected
to a suitable building ground.
IMPORTANT:
Contact a licensed electrician
to install and connect electrical
power to the appliance.
IMPORTANT:
Damage due to being
connected to the wrong
voltage or phase is NOT
covered by warranty.
IMPORTANT: Electrical
installation other than as
specied on the specication
sheet will void the UL listing,
and may void the warranty.
NOTE: Plumb connections
must be made in compliance
with all Federal, State and
Local Plumbing Codes and
Ordinances.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
6
INSTALLATION continued
PLUMBING INSTALLATION
For use in the State of Massachusetts, this appliance must be
installed in compliance with Massachusetts Fuel Gas and
Plumbing Code CMR 248.
1. IMPORTANT: All plumbing installations must be performed by
a qualied plumber.
2. For units equipped with a DRAIN LINE: Some jurisdictions
may require an approved air gap or other back-ow prevention
device in the drain. It is the responsibility of the plumber to
determine such requirement, to provide and properly install the
required device.
3. For SM-50-4, SM-50-7 and SM-50-11 DRAIN LINE units, the
drain must be attached with a union at the drain line tting. This is
necessary to provide for future maintenance of the heating element.
4. AUTOFILL units require a drain valve (not supplied by APW Wyott) to
be installed in order to operate correctly.
5. For AUTOFILL units: Some jurisdictions may require an approved
back-ow preventer in the water supply line. It is the responsibility
of the plumber to determine such requirement, and to provide and
properly install the required device.
Autoll supply must be connected to a COLD WATER line only.
6. AUTOFILL tee tting can be installed with the drain facing down or
turned 90° to manifold (not supplied) to another non-AUTOFILL unit.
NOTE: Plumb connections
must be made in compliance
with all Federal, State and
Local Plumbing Codes and
Ordinances.
WARNING:
RISK OF INJURY
While local plumbing codes
may allow the use of pcv,
cpvc, abs or other plastic pipe
for drain connections.
DO NOT attach a plastic
drain to the bottom of the
food warmer. These units
will contain water with
temperatures in excess of
180°F and localized metal
temperatures in excess of
275°F (135°C). Failure to
follow these directions may
result in personal injury and
property damage.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
7
OPERATION
WET OR DRY OPERATION for WARMERS
1. Carefully read the description of the warmer operation on the
specication sheet.
2. a. Most warmers are designed for WET OR DRY operation, except
AUTOFILL units..
b. Warmers may be used wet, or may be used dry. However
warmers may NOT be used wet-to-dry or dry-to-wet unless they
have been allowed to cool to room temperature between the
change in wet or dry operation.
c. APW Wyott Manufacturing recommends operating WET for
consistent food heating.
d. If your wet-operation warmer is allowed to run dry, turn it OFF and
allow to cool to room temperature before adding water.
3. If the warmer is to be used for WET operation, add approximately 1” of
hot tap water before turning the warmer on. Use of hot water will allow
a faster preheat.
a. Check the water level frequently and add hot water as necessary
to prevent the warmer from running dry. Do not add water to the
warmer if it has run dry.
b. If your wet-operation warmer is allowed to run dry, turn it OFF and
allow to cool to room temperature before adding water.
4. Damage caused by allowing a wet-operation warmer to run dry,
is NOT covered by warranty. Damage caused by adding water
to a dry warmer when hot is NOT covered by warranty.
PRE-HEATING THE WARMER
1. Place desired pan(s) or inset(s) with appropriate adapter top on
warmer.
a. Insets are available as accessories in 2½ qt., 4qt., 7 qt.,
and 11 qt. sizes with lids and adapter tops.
b. For dry operation, a 6” deep pan or inset is recommended.
2. Turn temperature control to HI or highest temperature setting.
3. Allow warmer to preheat for approximately 30 minutes, then set
the control for the desired temperature. Be sure to keep the
warmer covered during preheat and operation.
CAUTION:
HOT SURFACE
Exposed surfaces can be hot
to the touch and may cause
burns.
CAUTION:
SHOCK HAZARD
DO NOT splash or pour water
onto control panel or wiring.
Always use an inset.
DO NOT place food directly
into the warmer.
Always pour hot water into the
warmer before it is preheated.
DO NOT pour water into a
dry, heated warmer. This may
damage the unit.
DO NOT put ice into a
warmer pan. This will cause
condensation on the inside of
the warmer. Damage caused
by condensation is NOT
covered by warranty.
Stir thick food items frequently
to keep food heated uniformly.
Keep insets covered to
maintain food quality and
temperature.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
8
OPERATION continued
AUTOFILL WARMERS
1. Autoll warmers sense water level by a sensor placed at the proper
level. For manifolded autoll warmers, the water level sensor / ll tube
is in one pan only.
2. Water lls the pan through an inlet tube. All other sections if
manifolded, ll at the same time through the drain manifold.
3. The autoll function is active only when the thermostat for the pan with
the water level sensor is turned ON .
4. Make sure the drain valve is fully closed before turning any t-stats ON.
5. DO NOT use autoll warmers in the dry mode. This may damage the
water level sensor probe. NEVER turn the thermostat ON for the pan
with the probe and ll tube unless the entire warmer unit is to be used in
the wet mode.
6. Clean water level sensor daily to maintain water level in warmer.
OPERATION
1. Always use an inset. DO NOT place food directly into the
warmer.
2. Check water level in wet-operation warmer frequently during
use. Running warmers dry will lower the temperature of the
food in the insert pan, and may damage the warmer.
3. Alternating between wet and dry operation in any individual
warmer is NOT recommended.
4. DO NOT use metal tools, steel wool, or caustic or abrasive cleanser to
clean warmer pan.
WARMERS WITH MANIFOLDED DRAIN
1. Water poured into any one section will seek the same water level with
all sections on the manifold.
2. Make sure the drain valve is fully closed before lling warmer.
3. All units that are manifolded with the AUTOFILL unit, MUST be on
the same elevation and completely level with each other to operate
correctly.
CAUTION:
HOT SURFACE
Exposed surfaces can be hot
to the touch and may cause
burns.
CAUTION:
SHOCK HAZARD
DO NOT splash or pour water
onto control panel or wiring.
Always use an inset.
DO NOT place food directly
into the warmer.
Always pour hot water into the
warmer before it is preheated.
DO NOT pour water into a
dry, heated warmer. This may
damage the unit.
DO NOT put ice into a
warmer pan. This will cause
condensation on the inside of
the warmer. Damage caused
by condensation is NOT
covered by warranty.
Stir thick food items frequently
to keep food heated uniformly.
Keep insets covered to
maintain food quality and
temperature.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
9
MAINTENANCE INSTRUCTIONS
CARE OF STAINLESS STEEL
Stainless steel is a marvelous material: strong, lustrous and low maintenance. With
a minimum of care, it will normally retain its beauty and durability for the life of the
equipment. In some applications, however, special care is required in order to maintain
stainless steel’s special properties.
External components, such as cabinets and control panels, are nished with a grain
pattern. This pleasing nish is best maintained by cleaning with a non-abrasive
cleanser applied with a soft cloth. Rub only in the direction of the grain. In the absence
of visible grain, rub only along the longest axis of the appliance.
Restore stainless steel’s luster by applying a polish specically made for stainless steel.
Spray on, wipe o󰀨 with a soft cloth, rubbing in the direction of the grain.
Never use metal implements, wire brushes, abrasive scratch pads or steel
wool to clean stainless steel.
Warmer pans, insets and other vessels are subject to a harsher environment. APW
Wyott Manufacturing uses an very high quality stainless steel (#304DDQ) for our food
warmer pans. Even the highest quality stainless steel, however, is mostly iron, and will
rust, pit and corrode under the following conditions:
•Poor Water Quality: Hard water (water with a high content of dissolved minerals)
will leave mineral deposits when allowed to dry. Calcium (lime) can buildup on
heated surfaces, even under water. If left unattended, hard water spots and lime
buildup can lead to rusting, corrosion and pitting.
•Contact with Chlorides: Chlorides (specic compounds of chlorine) are found in
food, table salt and many cleansers. Chlorides can attack the surface of stainless
steel, resulting in corrosion and pitting.
Keep your stainless steel warmers clean and free from calcium buildup.
Use alkaline, alkaline chlorinated or non-chloride cleanser.
Use citric acid-based cleaners to remove calcium deposits.
For additional information, please read the NAFEM Stainless Steel Equipment and
Cleaning Guide. Contact NAFEM at :
North American Association of Food Equipment Manufacturers
401 N. Michigan Avenue
Chicago, Illinois 60611-4267
[phone]

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
10
DAILY CLEANING INSTRUCTIONS
PREPARATIONS: Turn control knob(s) to OFF. Allow warmer to cool
before proceeding.
Remove any insets, pans and/or adapter tops.
Drain or remove water from well if used for
wet operation.
FREQUENCY: Minimum - daily.
TOOLS: Mild Detergent
Solution: 10 Parts Warm Water to 4 Parts Vinegar
Plastic Scouring Pad
Clean Cloth or Sponge
Food-Grade Silicone Sealant
1. Wipe entire unit down using a clean cloth or sponge and mild
detergent.
2. Use a plastic scouring pad to remove any hardened food particles
or mineral deposits.
IMPORTANT: DO NOT use steel wool for cleaning.
3. Rinse warmer thoroughly with a vinegar and water solution to
neutralize all detergent cleanser residue.
4. Inspect warmer ange-to-counter seal. Reseal with food-grade
silicone sealant if necessary. Failure to do so may allow grease and
water to leak into insulation and heating element, causing a potential
re and/or electric shock hazard.
5. Inspect warmer tank for damage. Damage to the outer body may
allow grease and water to leak into insulation and heating element,
causing a potential re and/or electric shock hazard. Contact your
Authorized APW Wyott Service Agency to inspect warmer if water or
grease contamination is suspected.
6. Close drain valve. Add proper amount of warm water. Turn control
knob(s) ON and check for proper operation.
CLEANING INSTRUCTIONS
CAUTION:
SHOCK HAZARD
Do NOT splash or pour water
into or over any control panel
or wiring.
CAUTION:
SHOCK HAZARD
Disconnect warmer from
electric power before cleaning
CAUTION:
BURN HAZARD
Allow warmer to cool
completely before cleaning.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
11
CLEANING INSTRUCTIONS
WEEKLY CLEANING INSTRUCTIONS
PREPARATIONS: Remove any insets, pans and/or adapter tops.
Drain or remove water from well if used for wet
operation.
FREQUENCY: Weekly, or whenever lime or scale is seen
accumulating on the sides of the warmer pans.
TOOLS: Commercial Delime Cleaner
Plastic Scouring Pad
Clean Cloth or Sponge
1. Add water to pans until water is at normal operating level
(1” - 1 1/2” deep) or covers accumulated scale.
2. Heat water to maximum temperature (190ºF or higher).
3. Pour contents of one package of commercial delime cleaner
into each warmer pan. Stir to dissolve cleaner. Turn heat
control OFF. Cover pans.
4. Allow solution to soak at least one hour, or overnight for heavy
scale buildup.
5. Drain hot water from pans. Scrub with a plastic scouring pad.
Rinse thoroughly with hot water, then dry.
6. Rell pans with hot tap water and resume operation.
7. Heavy scale buildup may require additional treatments.
CAUTION:
CHEMICAL BURN
HAZARD
Delimng chemicals may be
caustic. Wear appropriate
personal protective equipment.
Follow cleaner manufacturer’s
instructions for safest use.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
12
TROUBLESHOOTING SUGGESTIONS
There are no user-serviceable components in this appliance.
In all instances of damage or malfunction, contact your Authorized APW Wyott Service Agency for
repairs.
SYMPTOM POSSIBLE CAUSE SUGGESTED REMEDY
No power to warmer Circuit breaker off or tripped Reset circuit breaker
Warmer will not heat Temperature control not set Set control to desired temperature
Warmer trips circuit breaker
Wet insulation Verify ange-to counter seal is sound, or reseal with food-grade
silicone sealant
Pan leaking or other internal
damage Contact your Authorized APW Wyott Service Agency for repairs
Internal damage Contact your Authorized APW Wyott Service Agency for repairs
Warmer slow to heat
Mineral deposits on pan acting
as a insulator Clean pan(s) with delime cleaner
Wired to wrong voltage Verify supply voltage - must match voltage on warmer nameplate
Drain-equipped unit will not
hold water
Drain valve not fully closed Check drain valve for debris and close fully
Drain valve damaged or pan(s)
leaking Contact your Authorized APW Wyott Service Agency for repairs
Auto-ll unit overows Water level sensor dirty Clean water level sensor
Internal damage Contact your Authorized APW Wyott Service Agency for repairs
Auto-ll unit does not ll
Water supply turned off or
restricted
Be sure water supply is turned on and water supply hose is not
pinched or twisted
Bad Probe or other Internal
Damage Contact your Authorized APW Wyott Service Agency for repairs
One or more pans of an
auto-ll unit do not ll Blocked drain manifold Clean drain manifold

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
13
WIRING DIAGRAM

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
14
EXPLODED VIEW & PARTS LIST
SM-50-7S and SM-50-11S with & without Drain
IL1904 Rev. F 4/08/15
Model: SM-50-4S, SM-50-7S & SM-50-11S (w & w/o Drain)
SM-50-4ULS, SM-50-7ULS & SM-50-11ULS (w & w/o Drain)
1
2
22 3
4
5
6
8
7
16
16
17
18
19
23
9
10
11
12
21
20
13
14
15

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
15
PARTS LIST
SM-50-4S, SM-50-7S & SM-50-11S units with & without drain 05/12 REV -
Model: SM-50-4S, SM-50-7S, SM-50-11S (Insulated & non-insulated) with & without Drian
Fig No Part No. Description Qty Application
1 2V-Z17446 Drain Screen 1 Drain Units
2
WS-63527
Pot Assembly
1
SM-50-4S
WS-50391 SM-50-7S
WS-51232 SM-50-11S
WS-63528
Pot Assembly w/Drain
SM-50-4DS
WS-50504 SM-50-7DS
WS-50392 SM-50-11DS
7 P2-WL0323 BOX OUTLET 1 SM-50-4, SM-50-7, SM-50-11, SM-50-4S, SM-50-7S, SM-50-11S
8 P2-31862 OUTLET BOX COVER 1
92K-34136X FTG FLEX CON 90° X 1/2” 1 CONDUIT UNITS
2K-37748X FTG CONDUIT STRAIGHT 3/8
10 P2-Z16805 CONTROL BOX 1 CONDUIT UNITS
11 WS-60282 THERMO CONTROL 1 SM-50-4S, SM-50-4DS, SM-50-7S, SM-50-7DS, SM-50-11S
12 P2-40843 THERMOSTAT MOUNTING
BRKT 1
13 I7-Z12221 CONTROL PANEL 1
14 2J-35687 LIGHT SIGNAL 1
15 2R-Z24181 CONTROL KNOB ASSY 1
16 2C-33935 SCREW 3
17 D8-306439 CLAMP BULB 3 SM-50-4, SM-50-7, SM-50-11, SM-50-4S, SM-50-7S, SM-50-11S
18 WS-506272 KIT, ELEMENT & SUPPORT 1 120V
WS-506273 208/240V
19 WS-51878 ELEMENT COVER 1
20 2V-WL0049 PANEL, CONTROL OVAL/
GUARD 1
21 2C-20602-03 CLIP RETAINER PILOT LIGHT 1
22
P2-WL0718
Pot Assembly
1
SM-50-4S
P2-WL0760 SM-50-7S
P2-WL0758 SM-50-11S
P2-WL0717
Pot Assembly w/Drain
SM-50-4DS
P2-WL0761 SM-50-7DS
P2-WL0759 SM-50-11DS
23 P2-WL0691 ASM-ELM MTG 1 SM-50-4, SM-50-7
P2-WL0757 SM-50-11
NI P2-40634 CONDUIT, FLEX 1/2” X 28” 1
NI P2-Z15643 CORDSET-14/3, 6-15P,
208/240V 1 208/240V CORDED UNITS
NI P2-Z15641 CORDSET-14/3, 5-15P, 120V 1 120V CORDED UNITS

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
16
CUSTOMER SERVICE DATA
please have this information available if calling for service
RESTAURANT _____________________________ LOCATION _____________
INSTALLATION DATE ________________________ TECHNICIAN ___________
SERVICE COMPANY ________________________________________________
ADDRESS ___________________________ STATE ______ ZIP__________
TELEPHONE NUMBER (_____)_____-_________
EQUIPMENT MODEL NO. _______________
EQUIPMENT SERIAL NO. _______________
VOLTAGE:(checkone) 120 208 240
DESCRIPTION PART NO.
ADAPTER TOP, convert SM-50-7 to hold 4 qt. inset 20177
ADAPTER TOP, convert SM-50-11 to hold 4 qt. inset 20822
ADAPTER TOP, convert SM-50-11 to hold 7 qt. inset 20175
4 QT. ROUND INSET w/ lid 20774
7 QT. ROUND INSET w/ lid 20587
11 QT. ROUND INSET w/ lid 20908
11 QT. ROUND INSET w/ hinged lid 21057
E-Z Lock EXTENSION KIT, for UL LISTED
circular warmers only, adapt to wood counter
up to 1¾” thick 22592*
* E-Z Lock Extension Kits for UL Listed units approved for
installation in wood counter tops One well units require one kit /
Two and three well units require two kits / four and ve well units
require three kits
DRAIN VALVE EXTENSION KIT, extension from drain
to counter front with remote handle, for use with
“D” models only, excluding “DM” models 20385
DRAIN SCREEN 2V-Z17446
OPTIONAL 72” WIRING, thermostatically controlled warmers**
** contact factory customer service for availability
PARTS & SERVICE
IMPORTANT: Use only factory
authorized service parts and
replacement lters.
For factory authorized service,
or to order factory authorized
replacement parts, contact your
APW Wyott authorized service
agency, or call:
APW Wyott
265 Hobson St.
Smithville, TN 37166
Service Dept.
Phone: [phone]
Service Parts Department
can supply you with the name
and telephone number of the
APW Wyott AUTHORIZED
SERVICE AGENCY nearest
you.

2M-Z24236 Owners Manual for Built-In Round T’Stat Warmers
17
NOTES

APW Wyott • www.apwwyott.com/
265 Hobson St. • Smithville, TN 37166
Telephone: [phone]
Printed in the U.S.A. • 2M-Z24236 • REV A (03-22)
Specications are subject to change without notice.
is a registered trademark of APW Wyott®, A Middleby Company. All rights reserved.