Marvel Refrigeration MS24RFSG Owner’s Manual

OPERATION AND MAINTENANCE

OF

MECHANICAL FIELD WARD

REFRIGERATOR

NSN4110-01-629-6841

MARVEL MODEL

#4570105-MODIFIED-230/115 VOLT, 60/50 Hz.

CONTRACT #

41012491 revision C

Marvel Refrigeraon

1260 E. VanDeinse St.

Greenville MI 48838

800.223.3900

CONTENTS

CHAPTER/PARAGRAPH

1. Introducon ...............................................................................................................................................

1-1 Introducon ...............................................................................................................................

1-2 Warning .....................................................................................................................................

1-4 Organizaon of the manual .......................................................................................................

1-5 Purpose of the Refrigerator .......................................................................................................

1-6 Descripon .................................................................................................................................

1-8 Specicaons .............................................................................................................................

1-9 Required Tools ...........................................................................................................................

1-10 Safety ........................................................................................................................................

2. Operaon ..................................................................................................................................................

2-1 Introducon ...............................................................................................................................

2-3 Shelf life, storage requirements, unpacking procedures, packaging, and preservaon

and storage inspecon ..............................................................................................................

2-4 Installaon .................................................................................................................................

2-5 Operaon and Theory of Operaon ..........................................................................................

3. Maintenance .............................................................................................................................................

3-1 Introducon ..............................................................................................................................

3-3 Safety ........................................................................................................................................

3-4 Prevenve Maintenance ...........................................................................................................

3-5 Troubleshoong ........................................................................................................................

3-6 Correcve Maintenance Procedures .........................................................................................

3-7 Fan Assembly Replacement .......................................................................................................

3-8 Transformer / 230 Volt Power Cord Replacement .....................................................................

3-9 115 Volt power Cord Replacement ............................................................................................

3-10 Door Gasket Replacement ........................................................................................................

3-11 Thermostat Replacement .........................................................................................................

3-12 Front Glide Replacement ..........................................................................................................

3-13 Rear Glide Replacement ...........................................................................................................

3-14 Freezer Door Replacement .......................................................................................................

3-15 Depot-Level Repair or Replacement Assemblies ......................................................................

3-16 Defrosng .................................................................................................................................

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4. Replacement Parts List ...............................................................................................................................

4-1 Introducon ...............................................................................................................................

5. Diagrams ....................................................................................................................................................

5-1 Introducon ...............................................................................................................................

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LIST OF ILLUSTRATIONS

FIGURE
NUMBER DESCRIPTION

1-1 Refrigerator, Front View ...................................................................................................................

1-2 Refrigerator, Rear View ....................................................................................................................

2-1 Door Handle Installaon .................................................................................................................

2-2 Refrigerator Funconal Block Diagram ............................................................................................

.

3-1 Mechanical Assembly .......................................................................................................................

4-1 Refrigerator, front View ....................................................................................................................

4-2 Refrigerator, Rear View ....................................................................................................................

4-3 Mechanical Assembly ......................................................................................................................

5-1 Refrigerator Wiring Diagram ............................................................................................................

LIST OF TABLES

TABLE
NUMBER DESCRIPTION

1-1 Specicaons ...................................................................................................................................

1-2 Required Tools ..................................................................................................................................

2-1 Shelf Life ..........................................................................................................................................

2-2 Storage Requirements .....................................................................................................................

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CHAPTER 1

INTRODUCTION

1-1 Introducon

1-2 This operaon and maintenance manual provides you with the necessary informaon for using and
maintaining the Mechanical and Biological Refrigerator, NSN 4110-01-629-6841. The manual includes informa­on for operaon, prevenve maintenance, and correcve maintenance.

WARNING

WHEN THE REFRIGERANT LINE HAS BEEN OPENED, OR FOR ANY OPERATION REQUIRING OPENING THE REFRIG­ERANT LINE, ONLY QUALIFIED MAINTENANCE PERSONNEL, USING PROCEDURES AND EQUIPMENT SPECIFIED

BY THE MANUFACTURER OR BY DEPOT-LEVEL AUTHORITIES, SHOULD WORK ON THE REFRIGERATION SYSTEM.

ANY MOISTURE THAT IS ALLOWED INTO THE REFRIGERATION LINES WILL COMBINE WITH THE FLUORINE RE­FRIGERANT TO PRODUCE HYDROFLUORIC ACID, AN EXTREMELY POWERFUL AND CORROSIVE ACID.

1-3 All procedures in this manual refer to the electrical and mechanical elements of operaon and mainte­nance.

1-4 Organizaon of the manual. As shown in the Table of Contents, this manual is organized as follows:

Chapter 1: INTRODUCTION. Provides informaon on organizaon of the manual, purpose of the
refrigerator, descripon and specicaons for the refrigerator, list of required equipment, and
safety informaon.

Chapter 2: OPERATION. Tells you shelf life, storage requirements, how to unpack, install, and oper
ate the refrigerator, with a brief theory of operaon.

Chapter 3: MAINTENANCE. Details the procedures for preventave and correcve maintenance of
the refrigerator.

Chapter 4: PARTS LIST. Lists, by assemblies, the replacement parts for the refrigerator, with part
numbers and illustraons.

Chapter 5: DIAGRAMS. Contains all illustraons cited in the text, but not otherwise included.

1-5 Purpose of the refrigerator. The refrigerator is to be used as a refrigerator-freezer at ward level in eld
hospitals as designated by the Department of Defense.

1-6 Descripon. Refer to Figures 1-1 and 1-2. The refrigerator is light weight and portable, designed for
eld operaons. Providing 6.1 cubic feet of refrigeraon and freezing space, the refrigerator incorporates three
shelves, drip pan, 0.7 cubic foot freezer compartment, adjustable thermostat, carrying handles, glide feet, and
corrosion resisng steel shield for mounng over rear mechanical openings. The refrigerator compartment op­erates over a temperature range of 34 to 42 degrees Fahrenheit, and the freezer compartment operates over
a range of 12 to 20 degrees Fahrenheit. The operaon of this unit may vary from unloaded performance when
loaded with commodies in various amounts and temperatures.

The refrigerator has a 230/115 VAC step-down transformer; it can operate from either 230 or 115 VAC, 60/50
Hz source. Figure 1-2, No. 2, 3, 7.

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Figure 1-1. Refrigerator, Front View

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3

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10 11

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1. Restraining strap 7. Thermostat, behind grill

2. Freezer door 8. Glides (4)

3. Drip tray 9. Hinge pin, top

4. Wire shelves (2) 10. Door gasket

5. Cabinet 11. Door

6. Crisper shelf and tray 12. Grill

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Figure 1-2. Refrigerator, Rear View

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1

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3

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1. Cabinet back cover 5. Power cord holding strap (2)

2. Transformer/230 Volt Power Cord 6. Stainless steel back shield

3. Transformer/ 115 Volt outlet 7. 115 Volt power cord

4. Wiring diagram 8. Grommet

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1-7 The outer shell of the refrigerator and the door cover are 1/32nd inch carbon steel with olive drab
nish. The inner shell and door liner are plasc. The door has a magnec latch. There is a door security snap
fastener located at the upper le corner for use during transport.

1-8 Specicaons. Table 1-1 lists the complete specicaons and parameters for the refrigerator,

NSN 4110-01-629-6841.

Table 1-1

Parameter Specicaon

Acceptable input voltages 115/230 VAC. Step-down transformer provided for use with 230 VAC source.

Acceptable input frequencies 50/60 Hz.

Power consumpon 380 was nominal; 2100 was maximum surge

Line current, maximum 18 amps inrush at 115 V; 9 amps inrush at 230 V.

Weight 106 lbs.

Volume, internal 6.1 cubic feet

Outer dimensions 34-3/4” H x 25-3/8” W x 24-1/16” D

Internal volume

Freezer

Refrigerator

Pull down mes at ambient temperature of:

120 degrees F
100 degrees F

77 degrees F

Nominal weight and volume in shipping container

Weight

Volume

Dimensions

Type of refrigerant R-134a

Weight of full charge of refrigerant 4.4 oz. (0.27 lb. or 0.12 kg.)

0.7 cubic feet, minimum

4.5 cubic feet, minimum

5.0 hours, max.

2.0 hours, max.

1-1/4 hours, max.

135 lbs.

16.8 cubic feet

38-1/2” H x 28” W x 27” D

1-9 Required tools. Table 1-2 lists all of the tools required for normal use and maintenance of the refrigera­to r.

Table 1-2

Descripon No. Req.

Hex Key Wrenches, 1/8” and 5/32” 1 of each

Phillips head screwdriver (8” long) 1

Flat blade screwdriver, (small approximately 1/8” wide blade) 1

Hand roller 1

36” x 36” cardboard sheet 1

36” x 36” table or bench 1

Channel lock adjustable pliers 1

Combinaon open end / box end wrenches 1

any standard mul-meter for checking voltages and connuity of circuits 1

Nut Driver, 5/16” and 3/8” 1 of each

Marvel Refrigeraon

For tools and associated equipment used in maintenance
procedures NOT described in this manual, refer to Depot-level

1260 E. VanDeinse St.
Greenville MI 48838

maintenance organizaon or contact the manufacturer:

800.223.3900

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1-10 Safety. ALWAYS observe the warning noce shown aer paragraph 1-2 above. Always disconnect power
before servicing. Failure to do so could result in property damage, physical injury, or death. For connecon to a
230 VAC source, be sure to use the step down transformer, as detailed in par. 2.4h, below.

1-11 When the refrigerator is in operaon, the condenser (radiator), the compressor, and the refrigerant
lines can get hot enough to burn the skin.

1-12 NEVER use an ungrounded cord or power outlet with this refrigerator. Such a pracce can produce elec­trical shocks and possibly damage operang elements of the system.

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CHAPTER 2

OPERATION

2-1 INTRODUCTION

2-2 This chapter details shelf life, storage requirements, unpacking, installaon, and operaon of the refrig­erator, with a brief explanaon of the theory of operaon.

2-3 SHELF LIFE STORAGE REQUIREMENTS, UNPACKING PROCEDURES, PACKAGING, AND PRESERVATION
AND STORAGE INSPECTION.

a. Shelf life. Table 2-1 lists the shelf life for the refrigerator.

Table 2-1

Locaon Shelf Life

Indoors 2 years (see Table 2-2 for details)

Outdoors 6 months (see Table 2-2 for details)

b. Storage Requirements. Table 2-2 lists the storage requirements for the refrigerator.

Table 2-2

State of Product Locaon Condions Required

Cartoned refrigerator Indoors Dry building, concrete or wooden oor, temperature maintained between -10° to

+120°F.,humidity up to 100% with units not stacked over three high. An earthen oor is
acceptable, if a metal, plasc, or wooden material/structure is used that prevents ground­water or rain from coming in contact with the cartons.

Cartoned refrigerator Outdoors Cartons covered with weatherproof material and kept o the ground by metal, plasc, or

wooden material/structure that prevents groundwater or rain from coming in contact with
the cartons. Temperatures to be between -10° to +120°F., humidity up to 100% and units
not stacked over two high.

Uncartoned refrigerator Indoors Dry building, concrete or wooden oor, temperature maintained between -10° to

+120°F.,humidity up to 100% with units not stacked over two high. A heavy wall 24” x 24”
piece of cardboard is to be placed on the top of the boom unit, if the refrigerators are
stacked two high, to protect the paint on the boom unit. An earthen oor is acceptable,
if a metal, plasc, or wooden material/structure is used that prevents groundwater or rain
from coming in contact with the refrigerators. See par. 2.3.d. for required packaging and
preservaon procedures.

Uncartoned refrigerator Outdoors Refrigerators covered with waterproof material and kept o the ground with a metal, plas-

c, or wooden material/structure that prevents groundwater or rain from coming in contact
with the refrigerators. Temperatures to be maintained between -10° to +120°F.,humidity
up to 100% with units not stacked over two high. A heavy wall 24” x 24” piece of cardboard
is to be placed on the top of the boom unit, if the refrigerators are stacked two high, to
protect the paint on the boom unit. See par. 2.3.d. for required packaging and preserva­on procedures.

c. Unpacking Procedures Unpacking is easy. The refrigerator is shipped in a heavy duty card

board carton, with slip-o top and boom covers held on by plasc straps. To unpack:

1. Stand the carton upright.

2. With n snips cut the lower plasc band.

3. Pull all four sides of the boom cover away and down from the sides of the carton.

4. Liing from the top, pull the carton up and o the refrigerator.

5. Dispose of the carton, wipe o the refrigerator, and its ready for installaon.

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d. Packaging and Preservaon Refrigerators that have been uncartoned and used in service re­ quire that the following procedures be done to them before they are made inacve and placed in
storage.

1. Turn the thermostat knob to the “OFF” posion to deacvate the refrigerator and before
removing the electrical plug(s) from the electrical supply outlet(s). The “OFF” posion on the
thermostat knob is achieved when the “OFF” marking on the knob is at the twelve o’clock
posion.

2. Remove the refrigerator electrical plug(s) from the electrical supply outlet(s). Roll up each
power-cord in an approximate one foot diameter coil. Secure each power cord to the back of
the refrigerator with the use of the plasc holding straps on the back of the refrigerator. Snap
the strap over its plasc prong unl it clips in place.

3. Open the refrigerator door, remove all commodies from the refrigerator, freezer, and door
shelves. Empty and dry any ice trays in the freezer compartment.

4. Allow the freezer compartment and its cold plate to completely defrost. You may leave the
cabinet and freezer door open to facilitate defrosng. Also, a heat source such as a pan of hot
water or a hair dryer may be used to speed up defrosng. NEVER use an ice pick or sharp instru­ ment to chip or break the ice away from the cold plate. Doing so may rupture the aluminum
tubes in the cold plate, allowing the refrigerant to escape and causing the system to fail. Escap­ ing refrigerant may cause injury to skin, due to frostbite or blindness to eyes due to contact with
the supercold refrigerant liquid/gas.

5. Aer all ice and frost have been removed from the refrigerator and freezer, thoroughly dry all
interior surfaces and parts. Place dried out ice trays in drip tray of refrigerator and the Opera­ on and Maintenance Manual in a 9” x 12” plasc bag. Place bag and manual on the cabinet
shelf.

6. Close the cabinet door and snap the plasc door latch onto the buon of the top le side of
the cabinet door.

7. Remove any dust or dirt that may be on the condenser coils and ns. The condenser is locat­ ed on the back of the cabinet on the lower right side as you look at the back, just inside the rect­ angular 5-1/4” x 2-1/4” opening on the stainless steel motor guard. A small vacuum cleaner
brush aachment works well in removing any dust or dirt that may exist.

8. Examine the cabinet and door outer painted surfaces. If any nicks or scratches exist in the
painted surface, use matching appliance touch up paint to cover and seal any nicks or
scratches.

9. The refrigerator is ready for uncartoned storage. See par. 2.3.b. for details.

10. If the refrigerator is to be re-cartoned and placed in storage, obtain a carton service assem­ bly kit from Marvel. Re-carton the unit as specied in the instrucons included with the kit.
The refrigerator, once re-cartoned, is ready for cartoned storage. See par.2.3.b. for details.

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