Merco MHC-22CE Service Manual

MHC-22 Holding Cabinet Items 86002 & 86003

Service, Installation and Operation Manual

Please read this manual completely before attempting to install or operate this equipment!

Notify carrier of damage!

Inspect all components immediately.

CAUTION

Important Information

Read Before Use

Please Save These Instructions!

February 2014

MHC-22 Holding Cabinet Items 86002 & 86003 Service, Installation And Operation Manual

Important Warning And Safety Information

WARNING Read This Manual Thoroughly Before Operating, Installing, Or Performing Maintenance On The Equipment.

WARNING Failure To Follow Instructions In This Manual Can Cause Property Damage, Injury Or Death.

WARNING Do Not Store Or Use Gasoline Or Other Flammable Vapors Or Liquids In The Vicinity Of This Or Any Other

Appliance.

WARNING Unless All Cover And Access Panels Are In Place And Properly Secured, Do Not Operate This Equipment.

WARNING This Appliance Is Not Intended For Use By Persons Who Lack Experience Or Knowledge, Unless They Have

Been Given Supervision Or Instruction Concerning Use Of The Appliance By A Person Responsible For Their
Safety.

WARNING This Appliance Is Not To Be Played With.

WARNING Do Not Clean With Water Jet.

WARNING Do Not Use Electrical Appliances Inside The Food Storage Compartment Of This Appliance.

CAUTION Observe the following:

• Minimum clearances must be maintained from all walls and combustible materials.

• Keep the equipment area free and clear of combustible material.

• Allow adequate clearance for air openings.

• Operate equipment only on the type of electricity indicated on the specification plate.

• Unplug the unit before making any repairs.

• Retain this manual for future reference.

2

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MHC-22 Holding Cabinet Items 86002 & 86003 Service, Installation And Operation Manual

Contents

Receiving & Inspecting The Equipment ....................................3

Serial Number Information ........................................................ 4

Warranty Information ................................................................. 4

Regulatory Certifications ............................................................ 4

Specifications ............................................................................. 5

Installation .................................................................................. 6

Control Panel ..............................................................................7

Operation .................................................................................... 8

Quick-Start Programming Instructions ................................9-12

Maintenance ........................................................................13-14

Application Guide ..................................................................... 15

Personalized Product Settings ................................................. 16

Troubleshooting .......................................................................17

Diagnostic Mode ...................................................................... 18

Wiring Diagram ........................................................................ 19

Sequence Of Operation ............................................................ 19

Replacement Parts ................................................................... 20

Replacement Instructions ........................................................ 21

Notes ...................................................................................22-23

Receiving And Inspecting The Equipment

Care should be taken during unloading so the equipment is not
damaged while being moved into the building.

1. Visually inspect the exterior of the package and skid or
container. Any damage should be noted and reported to
the delivering carrier immediately.

2. If damaged, open and inspect the contents with the carrier.

3. In the event that the exterior is not damaged, yet upon
opening, there is concealed damage to the equipment
notify the carrier. Notification should be made verbally as
well as in written form.

4. Request an inspection by the shipping company of the

5. Check the lower portion of the unit to be sure legs are

6. Freight carriers can supply the necessary damage forms

7. Retain all packaging material until an inspection has been

damaged equipment. This should be done within 10 days
from receipt of the equipment.

not bent.

upon request.

made or waived.

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3

MHC-22 Holding Cabinet Items 86002 & 86003 Service, Installation And Operation Manual

Serial Number Information

MHC-22 holding cabinet 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.

©2014 Merco. All rights reserved. Reproduction without written permission is
prohibited.

Warranty Information

Visit http://www.mercoproducts.com/minisite/service/warranty_info to:

• Register your product for warranty.

• Verify warranty information.

• View and download a copy of your warranty.

Regulatory Certifications

120V Models are certified by:

Underwriters Laboratories Sanitation

Underwriters Laboratories (UL)
Underwriters Laboratories of Canada (ULC)

230V Models are certified by:

Underwriters Laboratories Sanitation

European Conformity
Technical Inspection Association

4

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Specifications

MHC-22 Holding Cabinet Items 86002 & 86003 Service, Installation And Operation Manual

Item/Sku Model/Description V-Hz-Ph Watts Amps Plug Type

86002 MHC-22 120-60-1 1250 10.4

NEMA
5-15P

Net Wt.

lbs/kg

30/14 35/16

Ship Wt.

lbs/kg

86003 MHC-22, CE 230-50-1 1250 5.5 CEE 7/7 30/14 35/16

Removable back for pass-through applications

13.65”

(35cm)

17.51”

(44cm)

Plan View

19.50”

(50cm)

10.76”

(27cm)

Elevation View End View

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5

MHC-22 Holding Cabinet Items 86002 & 86003 Service, Installation And Operation Manual

Installation

Site Preparation

Choose a well-ventilated location. Place the holding cabinet on
a suitable table or counter capable of supporting the weight of
30 lbs. or 14 kg. The power supply must be in accordance with
the specifications on the data plate located on the rear of the
appliance. It should be installed on a dedicated service line with
no other equipment on the circuit. The unit must be positioned
so that the unit’s plug is accessible.

Installation Instructions

1. Remove legs from unit.

2. Place mounting brackets on either side of unit and attach

by inserting the screws/washers (provided) into the holes
left by the vacated legs. Tighten firmly.

3. With brackets securely attached to the unit, place the unit

where it is to be mounted and mark the locations for stud
placement.

4. Mount unit to shelf using hardware (not included) capable

of handling the weight of unit.

Mounting Kit contains (2) brackets, (4)
screws & (4) washers

5. With stud locations marked, attach studs with stud gun.

Insert nut and washer on each stud then insert unit with
mounting brackets followed by additional washers and
nuts to complete the installation. NOTE: Studs should
be ¼-20 stainless steel. Studs, washers and nuts are not
included.

Hole locations to mark for stud placement

Mounting brackets on either side of unit

Unit with mounting kit attached

6

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Control Panel

MHC-22 Holding Cabinet Items 86002 & 86003 Service, Installation And Operation Manual

Bin 1 Button

Up Arrow Button

Down Arrow Button

Temperature Button

Bin 2 Button

Program Button

Time Button

Bin 4 ButtonBin 3 Button

On/Off Button

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7

MHC-22 Holding Cabinet Items 86002 & 86003 Service, Installation And Operation Manual

Operation

The Merco Holding Cabinet has been designed to afford
foodservice operators the ability to cook menu components in
advance and then gently store that product in the holding bins
until an order is received. Once that order has been placed,
the crew can assemble the order using hot and fresh menu
components from the holding bins. This allows for operators
to serve to order, helping increase speed of service while
maintaining high product quality standards.

The holding bin controller is, at all times, operating in one of
three modes:

• Normal mode

• Programming mode

• Diagnostic mode

Instructions for each of these operating modes are detailed
below.

If the supply cord appears to be damaged, do not
attempt to operate unit. Contact service agent or

WARNING

qualified technician to repair.

When holding potentially hazardous foods, the
minimum shelf temperature must be 220°F for the

CAUTION

upper-bin heating element and 200°F for the lower-bin
heating element.

Normal Mode

This is the normal mode of operation. The product for each bin
is displayed, timers are activated for loaded bins, alarms are
generated for cook more and expired product.

Typical Operator Actions

Action Instructions

Turn Unit On Push Power On/Power Off button.

Green Power button will illuminate in
on position.

Load bin with
product and start
timer

Pull out tray, load product and reinsert
bin. Push and hold bin button. Bin
display will change to show presence
of product. Control will sound one
short beep. Release hold of bin button.

Empty bin and
stop timer

Pull out tray and remove product.
Reinsert tray. Press and hold bin
button. The bin display will indicate
empty bin (----). Control will sound one
short beep.

Action Instructions

Silence Alarm for
Cook or Dump

Locate bin displaying Attn and press
the bin button. The alarm will be
silenced. Bin will continue to indicate
desired action: Cook (it is now time to
cook additional product) or Dump (it is
now time to discard product in bin).

Normal Display Modes

Each bin display consists of two parts, a primary and secondary
message word. These words are displayed one after the other,
repeating regularly. The following sections describe the type of
displays present under various conditions.

Bin empty display: Bin display shows product name followed
by ---- to indicate that bin is empty.

Bin loaded: Bin display shows product name followed by a brief
display of the time remaining until the product expires.

Bin alarm for Cook More: Bin display shows Attn and a brief
Cook message. Once the alarm is silenced, the display will
show the product name followed by Cook. This condition
persists until the product expires or the bin is emptied.

Bin alarm for Holding Time Expiration: Bin display shows Attn
followed by Dump. Once the alarm is silenced, the display
indicates the product name followed by Dump. This condition
persists until the bin is emptied.

Programming Mode

See the next section, Quick Start Programming Instructions.

Diagnostic Mode

See page 18.

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