Cornelius COR20RRTM, COR74RRTMT, COR40RRTMD, COR22RRTM, COR48RRTMD User Manual

REACH-IN REFRIGERATORS

COR20RRTM, COR22RRTM, COR40RRTMD,

COR48RRTMD, COR74RRTMT

Service Manual

Re

SERVICE MANUAL

The products, technical information, and instructions contained in this manual are subject
to change without notice. These instructions are not intended to cover all details or varia­tions of the equipment, nor to provide for every possible contingency in the installation,
operation or maintenance of this equipment. This manual assumes that the person(s)
working on the equipment have been trained and are skilled in working with electrical,
plumbing, pneumatic, and mechanical equipment. It is assumed that appropriate safety
precautions are taken and that all local safety and construction requirements are being
met, in addition to the information contained in this manual.

To inquire about current revisions of this and other documentation or for assistance with
any Cornelius product contact:

www.cornelius.com

800-238-3600

Trademarks and copyrights:
Aurora, Cornelius, Decade, Hydro Boost, Sitco, Spirit, UF-1, Vanguard, Venture, Olympus,

and Vista are registered trademarks of IMI Cornelius Inc.
Optifill trademark is pending.

This document contains proprietary information and it may not be

reproduced in any way without permission from Cornelius.

Printed in U.S.A.

Copyright © 2004, All Rights Reserved, IMI Cornelius, Inc.

Reach-In Refrigerator Service Manual

TABLE OF CONTENTS

Features of the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Cleaning and Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

How Your Cabinet Operates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Defrost water flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Warning light and thermometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Automatic defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Service Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Light switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Temperature controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Time clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Blower fan assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Defrost heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

COR20RRTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

COR22RRTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

COR40RRTMD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

COR48RRTMD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

COR74RRTMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Possible causes and solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

© 2004, IMI Cornelius Inc. - i - Publication Number: 630460272SER

Reach-In Refrigerator Service Manual

Publication Number: 630460272SER - ii - © 2004, IMI Cornelius Inc.

FEATURES OF THE UNIT

Heavy duty condensing

unit located on top for

easy-access maintenance.

Reach-In Refrigerator Service Manual

Control panel with

temperature display, door ajar

light, power indicator,

condensate switch

U.L. compliant electrical components

Heavy duty hinges with self-closing mechanism

Strong body with 2 1/2” thick walls injected with

CFC-free polyurethane. Stainless steel front

and exterior sides.

COR48RRTMD

Heavy duty shelves

Recessed handles with cylinder lock

Solid doors save energy by preventing warm air

from reaching your products.

Forced air evaporator for quick temperature pull

down

6” swivel casters

FIGURE 1

© 2004, IMI Cornelius Inc. - 1 - Publication Number: 630460272SER

Reach-In Refrigerator Service Manual

CLEANING AND PREVENTIVE MAINTENANCE

Weekly or sooner, as required:

1. Disconnect the power source before cleaning. Remove all products and place in a proper cooler.

2. Clean the interior and exterior with a mild soap or detergent solution and then rinse with a warm

baking soda solution (one cup of baking soda to one gallon of warm water). Dry the interior

completely before replacing products.

3. Clean the condenser unit periodically by vacuuming the unit compartment, especially the
condenser unit coil (it looks like a small auto radiator). If the condenser coil has accumulated dirt
and grease (possible in heavy traffic areas or a kitchen), use a strong cleaning solution. If you find
any oil in the condensing unit compartment, call a qualified service person immediately.

FIGURE 2

4. Empty out and clean drain pan located next to the condensing unit as required. Check regularly for
excessive water accumulation.

5. Plug in the cabinet and wait until the proper temperature is achieved before reloading the cabinet
with product.

Publication Number: 630460272SER - 2 - © 2004, IMI Cornelius Inc.

HOW YOUR CABINET OPERATES

CAUTION - Make sure the power supply is turned off before making any electrical repairs.

Defrost water flow

Your new cabinet is completely self-defrosting. The frost that collects on the concealed coils is
automatically removed at predetermined intervals. The defrost water on top-mounted condensing units
flows into a thermostatically controlled electric vaporizer where it is dissipated into the atmosphere. All
defrost evaporator systems are designed for normal conditions; however, under some conditions, where
practical and convenient, a drain line to a floor drain may be preferable to the vaporizer. On base­mounted condensing units, the defrost water flows into the unit compartment and is vaporized by the heat
from the hot gas line.

Reach-In Refrigerator Service Manual

Warning light and thermometer

A fan circulates the cold air from the coil throughout the storage area. This provides uniform
termperatures and more rapid recovery after door openings. The number of door openings and the length
of time the door is left open should be kept to a minimum to reduce the operating cost and maintain the
most efficient operation. The temperature in the cabinet will rise very rapidly whenever the doors are
opened; however, the product temperature is not greatly affected.

Some top-mounted cabinets have a thermometer and two small lights located at the right end of the front
motor cover grill, directly over the door. One light is green and is always lit when there is power to the
cabinet. One light is red and should only be lit when the temperature is above the safe zone. It is
controlled by a bi-metallic disk type switch.

The red light will be on at start up until the temperature comes down to normal. When warm product is
put in or the doors are held open for a time, the red light may come on but it will go out again as soon as
the temperature has recovered. When the doors are closed again, the recovery is very rapid unless a
large quantity of warm product is put in at one time.

FIGURE 3
FIGURE 4

© 2004, IMI Cornelius Inc. - 3 - Publication Number: 630460272SER