Welbilt Merco CrispyMax MCG1027NNN User manual

CrispyMax™
Crisp and Ready Serving Station
Original Instructions
Installation, Operation and Maintenance Manual
This manual is updated as new information and models are released. Visit our website for the latest manual.
Serving Quality on Demand
Part Number: MER_IOM_8197863 08/2020
*8197863*
Original Instructions
CAUTION
READ THE INSTRUCTIONS BEFORE USING.
Keep these instructions for future reference.

Safety Notices
nWarning
Read this manual thoroughly before operating, installing
or performing maintenance on the equipment. Failure
to follow instructions in this manual can cause property
damage, injury or death.
DANGER
Do not install or operate equipment that has been
misused, abused, neglected, damaged, or altered/
modified from that of original manufactured
specifications.
DANGER
Keep power cord AWAY from HEATED surfaces. DO NOT
immerse power cord or plug in water. DO NOT let power
cord hang over edge of table or counter.
nWarning
Authorized Service Representatives are obligated to
follow industry standard safety procedures, including,
but not limited to, local/national regulations for
disconnection / lock out / tag out procedures for all
utilities including electric, gas, water and steam.
nWarning
Do Not Store Or Use Gasoline Or Other Flammable
Vapors Or Liquids In The Vicinity Of This Or Any Other
Appliance. Never use flammable oil soaked cloths or
combustible cleaning solutions, for cleaning.
nWarning
Operation, installation, and servicing of this product may
expose you to chemicals/products including [Bisphenol
A (BPA), glass wool or ceramic fibers, and crystalline
silica], which is [are] known to the State of California to
cause cancer, birth defects or other reproductive harm.
For more information go to www.P65Warnings.ca.gov.
nWarning
Do not use electrical appliances inside the food storage
compartments of the appliance, unless they are of the
type recommended by the manufacturer.
nWarning
Use caution when handling metal surface edges of all
equipment.
nWarning
This appliance is not intended for use by children
under the age of 16 or persons with reduced physical,
sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision
concerning use of the appliance by a person responsible
for their safety. Do not allow children to play with this
appliance.
nWarning
DO NOT use this product near water – for example, near
a kitchen sink, in a wet basement, near a swimming
pool, or similar locations.
NOTE: Proper installation, care and maintenance are essential
for maximum performance and trouble-free operation of
your equipment. Visit our website www.mercoproducts.com
for manual updates, translations, or contact information for
service agents in your area.

Section 1
General Information
Model Numbers ................................................................................................. 1-1
Serial Number Location .................................................................................... 1-1
Service Personnel .............................................................................................. 1-1
Warranty Information....................................................................................... 1-1
Regulatory Certifications.................................................................................. 1-1
Section 2
Installation
Location .............................................................................................................. 2-1
Weight of Equipment......................................................................................... 2-1
Clearance Requirements .................................................................................. 2-2
Dimensions......................................................................................................... 2-2
Electrical Service................................................................................................ 2-2
Voltage ................................................................................................................ 2-2
Ground Fault Circuit Interrupter...................................................................... 2-2
Rated Amperages, Horsepower, Voltage & Power Cord Chart.................... 2-3
Section 3
Operation
Start Up Instructions......................................................................................... 3-1
Section 4
Maintenance
Cleaning and Sanitizing Procedures ................................................................ 4-1
General ............................................................................................................... 4-1
Daily Cleaning Instructions............................................................................... 4-2
Stainless Steel Cleaning .................................................................................... 4-2
Monthly Cleaning Instructions......................................................................... 4-3
Section 5
Troubleshooting
Troubleshooting Chart ...................................................................................... 5-1
Sequence Of Operation..................................................................................... 5-1
LED Troubleshooting ......................................................................................... 5-1
Table of Contents

1-1
Model Numbers
NOTE: This manual covers standard units only. If
you have a custom unit, consult the technical service
department.
Model Model Description
MCG1027NNN Counter Top (Single Lane)
XMCG1027NNN Counter Top (Single Lane)(Export)
MCG1827NNN Counter Top (Double Lane)
XMCG1827NNN Counter Top (Double Lane)(Export)
MCG2727NNN Counter Top (Triple Lane)
XMCG2727NNN Counter Top (Triple Lane)(Export)
Serial Number Location
CrispyMax™ Holding Station serial numbers are
located on the data plate that also includes the
model number. The data plate is located on the rear
of the unit.
Always have the serial number of your unit
available when calling for parts or service.
Service Personnel
All service on Merco equipment must be performed
by qualified, certified, licensed, and/or authorized or
service personnel.
Qualified service personnel are those who are familiar
with Merco equipment and who have been authorized
by Merco to perform service on the equipment. All
authorized service personnel are required to be
equipped with a complete set of service and parts
manuals, and to stock a minimum amount of parts for
Merco equipment. A list of Merco Factory Authorized
Servicers (FAS’s) is located on the Merco website at
http://www.mercoproducts.com/Service#Service.
Failure to use qualified service personnel will
void the Merco warranty on your equipment.
Warranty Information
Visit http://www.mercoproducts.com/
Service#Warranty to:
• Register your product for warranty,
• Verify warranty information,
• View and download a copy of your warranty,
Regulatory Certifications
Models are certified by:
• UL, LLC (Sanitation)
• UL, LLC (U.S and Canada)
• CE
Section 1
General Information

2-1
DANGER
Installation must comply with all applicable fire
and health codes in your jurisdiction.
DANGER
Use appropriate safety equipment during
installation and servicing.
Location
nWarning
This equipment must be positioned so that
the plug is accessible unless other means for
disconnection from the power supply (e.g., circuit
breaker or disconnect switch) is provided.
nWarning
Adequate means must be provided to limit the
movement of this appliance without depending
on or transmitting stress to the electrical conduit.
nWarning
To avoid instability the installation area must
be capable of supporting the combined weight
of the equipment and product. Additionally the
equipment must be level side to side and front to
back.
nWarning
This equipment is intended for indoor use only.
Do not install or operate this equipment in
outdoor areas.
,Caution
Do not position the air intake vent near steam or
heat exhaust of another appliance.
The location selected for the equipment must meet
the following criteria. If any of these criteria are not
met, select another location.
• Holding cabinets are intended for indoor use only.
• The location MUST be level, stable and capable of
supporting the weight of the equipment.
• The location MUST be free from and clear of
combustible materials.
• Equipment MUST be level both front to back and
side to side.
• Position the equipment so it will not tip or slide.
• Recommended air temperature is 41° - 86°F (5° -
30°C) .
• Proper air supply for ventilation is REQUIRED AND
CRITICAL for safe and efficient operation. Refer to
Clearance Requirements chart on page 2-2.
• Do not obstruct the flow of ventilation air. Make
sure the air vents of the equipment are not
blocked.
Weight of Equipment
Model Shipping Equipment
Weight
MCG1027NNN 35lb/16kg
XMCG1027NNN 35lb/16kg
MCG1827NNN 57lb/26kg
XMCG1827NNN 57lb/26kg
MCG2727NNN 79lb/36kg
XMCG2727NNN 79lb/36kg
Section 2
Installation

2-2
Installation Section 2
Clearance Requirements
DANGER
Minimum clearance requirements are the same
for noncombustible locations as for combustible
locations. The flooring under the appliance must
be made of a noncombustible material.
DANGER
Risk of fire/shock. All minimum clearances must
be maintained. Do not obstruct vents or openings.
Counter Top Models Clearance Requirements at Rear
Intakes
1.00” (2.54cm)
Do not cover or block the open top of the unit
Dimensions
Model Width Depth Height
MCG1027NNN 10.00”
(254mm)
26.60”
(676mm)
7.20”
(183mm)
XMCG1027NNN 10.00”
(254mm)
26.60”
(676mm)
7.20”
(183mm)
MCG1827NNN 18.50”
(470mm)
26.60”
(676mm)
7.20”
(183mm)
XMCG1827NNN 18.50”
(470mm)
26.60”
(676mm)
7.20”
(183mm)
MCG2727NNN 27.00”
(686mm)
26.60”
(676mm)
7.20”
(183mm)
XMCG2727NNN 27.00”
(686mm)
26.60”
(676mm)
7.20”
(183mm)
Electrical Service
DANGER
Check all wiring connections, including factory
terminals, before operation. Connections can
become loose during shipment and installation.
nWarning
This appliance must be grounded and all field
wiring must conform to all applicable local and
national codes. Refer to rating plate for proper
voltage. It is the responsibility of the end user
to provide the disconnect means to satisfy the
authority having jurisdiction.
VOLTAGE
All electrical work, including wire routing and
grounding, must conform to local, state and national
electrical codes.
The following precautions must be observed:
• The equipment must be grounded.
• A separate fuse/circuit breaker must be provided
for each unit.
• A qualified electrician must determine proper
wire size dependent upon location, materials
used and length of run (minimum circuit ampacity
can be used to help select the wire size).
• The maximum allowable voltage variation is ±10%
of the rated voltage at equipment start-up (when
the electrical load is highest).
• Check all green ground screws, cables and wire
connections to verify they are tight before start-
up.
GROUND FAULT CIRCUIT INTERRUPTER
Ground Fault Circuit Interrupter (GFCI/GFI) protection
is a system that shuts down the electric circuit
(opens it) when it senses an unexpected loss of
power, presumably to ground. Merco does not
recommend the use of GFCI/GFI circuit protection
to energize our equipment. If code requires the
use of a GFCI/GFI then you must follow the local
code. The circuit must be dedicated, sized properly
and there must be a panel GFCI/GFI breaker. We
do not recommend the use of GFCI/GFI outlets to
energize our equipment as they are known for more
intermittent nuisance trips than panel breakers.

2-3
Section 2 Installation
RATED AMPERAGES, VOLTAGE & POWER CORD
CHART
Units with plugs are supplied with approximately 6ft
(183cm) cords.
Model V, Hz, Ph Amps Watts Plug Type
MCG1027NNN 120, 60, 1 8.0 980 NEMA 5-15P
XMCG1027NNN 200-240, 50/60, 1 4.4-5.4 890-1275 CEE 7/7
MCG1827NNN 120, 60, 1 15.9 1910 NEMA 5-20P
XMCG1827NNN 200-240, 50/60, 1 8.8-10.6 1768-2530 CEE 7/7
MCG2727NNN 208-240, 60, 1 13.8-15.9 2870-3815 NEMA 6-20P
XMCG2727NNN 200-240, 50/60, 1 13.2-15.9 2655-3815 20A/250V
Pin and Sleeve

3-1
DANGER
The on-site supervisor is responsible for ensuring
that operators are made aware of the inherent
dangers of operating this equipment.
DANGER
Do not operate any appliance with a damaged
cord or plug. All repairs must be performed by a
qualified service company.
DANGER
Never stand on the unit! They are not designed to
hold the weight of an adult, and may collapse or
tip if misused in this manner.
nWarning
Do not contact moving parts.
nWarning
All covers and access panels must be in place
and properly secured, before operating this
equipment.
nWarning
Racks, utensils, rack guides, and oven surfaces
may become hot during or after use. Use utensils
or protective clothing, like pan grips or dry oven
mitts, when necessary to avoid burns.
nWarning
DO NOT use the cavity for storage. DO NOT leave
paper products, cooking utensils, or food in the
cavity when not in use.
nWarning
The operator of this equipment is solely
responsible for ensuring safe holding temperature
levels for all food items. Failure to do so could
result in unsafe food products for customers.
,Caution
Do not block the supply and return air grills or
the air space around the air grills. Keep plastic
wrappings, paper, labels, etc. from being airborne
and lodging in the grills. Failure to keep the air
grills clear will result in unsatisfactory operation
of the system.
,Caution
Failure to follow the operating and cleaning
instructions could cause grease build-up which
may result in a decrease in food quality.
Note
The airflow and temperature is factory pre-set
for optimum holding time for all fried foods. No
adjustment of airflow or temperature is required.
Start Up Instructions
1. Verify that both the crumb tray and food tray
are installed properly (see Section 4 for proper
installation).
2. Adjust dividers to desired location. Make sure all
tabs of the divider are engaged in the food tray.
3. Turn the power on by pressing the power switch
located on the front of the unit in the lower right
corner. The LED above the switch will turn GREEN
and blink intermittently while the unit is heating
up to operating temperature.
4. After approximately 30 minutes the unit should
complete its preheat cycle. Once the LED is solid
GREEN it is ready to receive food for holding.
Section 3
Operation

4-1
DANGER
All utility connections and fixtures must be
maintained in accordance with local and national
codes.
DANGER
It is the responsibility of the equipment owner to
perform a personal protective equipment hazard
assessment to ensure adequate protection during
maintenance procedures.
DANGER
Failure to disconnect the power at the main power
supply disconnect could result in serious injury or
death. The power switch DOES NOT disconnect all
incoming power.
DANGER
Disconnect electric power at the main power
disconnect for all equipment being serviced.
Observe correct polarity of incoming line voltage.
Incorrect polarity can lead to erratic operation.
nWarning
All CrispyMax units have a 5-min cool down
feature, where after the power switch is turned off,
the fans will run for 5 minutes to help cool down.
Never unplug or disconnect the incoming power
before the unit before cool-down is complete as
this will bypass an important safety feature and
may cause injury. Always allow unit to cool down
prior to disconnecting from power source.
nWarning
Never use a high-pressure water jet for cleaning
or hose down or flood interior or exterior of units
with water. Do not use power cleaning equipment,
steel wool, scrapers or wire brushes on stainless
steel or painted surfaces.
nWarning
When using cleaning fluids or chemicals, rubber
gloves and eye protection (and/or face shield)
must be worn.
nWarning
When cleaning interior and exterior of unit, care
should be taken to avoid the front power switch
and the rear power cord. Keep water and/or
cleaning solutions away from these parts.
,Caution
Maintenance and servicing work other than
cleaning as described in this manual must be
done by an authorized service personnel.
,Caution
Never use an acid based cleaning solution on
stainless steel! Many food products have an acidic
content, which can deteriorate the finish. Be sure
to clean the stainless steel surfaces of ALL food
products.
Cleaning and Sanitizing Procedures
GENERAL
You are responsible for maintaining the equipment
in accordance with the instructions in this manual to
ensure satisfactory performance of your CrispyMax
Crisp & Ready Serving Station. Neglecting to follow
these procedures may result in reduced holding
times, reduced reliability and may void the warranty.
Maintenance procedures are not covered by the
warranty.
Maintenance Daily After
Prolonged
Shutdown
At Start-Up
Dividers, Food
Tray and Crumb
Tray
X X X
Interior X X X
Exterior X X X
Section 4
Maintenance

4-2
Maintenance Section 4
DAILY CLEANING INSTRUCTIONS
1. Upon completion of the last holding cycle of
the day, allow the unit to cool approximately 30
minutes.
2. Disconnected from power source.
3. Remove divider(s) if present.
4. Remove food tray.
5. Remove crumb tray.
6. Wash components with soapy water.
7. Use a soft cloth or sponge, dampened with warm
soapy water, to wash the interior and exterior of
the appliance.
NOTE: Do not flood the appliance with cleaning
fluid!
8. Airflow openings should be inspected and any
blockage should be removed.
9. Rinse using a cloth dampened with clear water,
then dry.
10.Reinstall crumb tray, food tray and divider(s).
11.Ensure the food tray is inserted correctly. The
front edge should be flush with the cabinet.
Correct placement of the food tray.
Incorrect placement of the food tray. Front edge is too
high.
Incorrect placement of the food tray. Food tray is
rotated 180˚.
STAINLESS STEEL CLEANING
Stainless steel requires nothing more than a daily
wiping with a damp cloth. If, however, an excessive
amount of food particles/grease are allowed to
collect, a non-abrasive cleaner (hot sudsy water) may
be used. Merco recommends Merco Degreaser to
help remove stubborn, sticky, greasy buildup. Wipe
dry with a clean, soft cloth.
Always rub with the “grain” of the stainless steel to

4-3
Section 4 Maintenance
avoid marring the finish. Never use steel wool or
abrasive pads for cleaning. Never use chlorinated,
citrus based or abrasive cleaners.
Stainless steel has a clear coating that is stain resistant
and easy to clean. Products containing abrasives will
damage the coating and scratch it. Daily cleaning may
be followed by an application of stainless steel cleaner
which will eliminate water spotting and fingerprints.
Early signs of stainless steel breakdown are small pits
and cracks. If this has begun, clean thoroughly and
start to apply stainless steel cleaners in an attempt to
restore the steel.
MONTHLY CLEANING INSTRUCTIONS
1. The air filter should be cleaned once per month
at a minimum. A small round LED indicator above
the power switch will indicate if it needs attention
prior to that. See troubleshooting in Chapter 5.
2. Remove the filter, by lifting it straight up and
out. It is a metal mesh framed filter (similar to a
household range vent hood filter), located at the
back of the unit.
3. Clean the filter. It is dishwasher safe.
4. Allow the filter to air dry for at least 2 hours, or
overnight, before reinstalling. DO NOT operate
with a wet filter in place.

5-1
Troubleshooting Chart
Problem Probable Cause Corrective Action
Machine doesn’t operate. No power. Check power source. Verify voltage.
Call for service.
Excessive time to reach
temperature.
Improper food tray installation /
Blocked airflow at rear of unit /
Dirty or plugged air filter
Install food tray properly / Remove
any airflow blockages / Clean and
dry air filter then reinstall.
Low airflow volume. Improper food tray installation /
Blocked airflow at rear of unit /
Dirty or plugged air filter
Install food tray properly / Remove
any airflow blockages / Clean and
dry air filter then reinstall.
Airflow works but no heat. Internal wiring. Call for service.
Degrading performance. Grease or debris build-up. Clear air intakes at front and rear of
unit.
Sequence Of Operation
Power Supply Electrical power is supplied to the unit by a 3 conductor service for single phase.
Black conductor is hot.
White conductor is neutral.
Green and yellow conductor is ground.
Power is permanently supplied to one of the normally open contacts of the main switch
also to one side of the normally open contacts of the main heater relay.
Heating Circuit Closing the main power switch feeds power through the normally closed high limit
thermostat to the coil of the main relay. Its contacts now close supplying power to the
main heater. Also for air circulation power is supplied to the main fan motor.
This unit has intelligent controls, software and a feedback loop that will automatically adjust for consistent
performance across a range of voltages (110-120V / 200-240V, depending on the model)
LED Troubleshooting
There is a small round LED above the power switch
on the front of the unit that changes color and/
or flashes to alert the user of any performance or
service issues.
Section 5
Troubleshooting

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©2020 Welbilt Inc. except where explicitly stated otherwise. All rights reserved. Connuing product improvement may necessitate change of specicaons without noce.
Part Number: MER_IOM_8197863 08/2020
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Serving Quality on Demand