Traulsen RET232NUT-HHS Service Manual

Traulsen Refrigeration

SERVICE MANUAL #05

Instructions For The Troubleshooting And

Repair Of Traulsen R-Series

Even-Thaw Refrigerator Models

RET232NUT-FHS & RET232NUT-HHS

-NOTICE-

This Manual is prepared for the use of trained Authorized Traulsen Service Agents and should not be used
by those not properly qualified. This manual is not intended to be all encompassing, but is written to
supplement the formal training, on-the-job experience and other product knowledge acquired by Autho­rized Traulsen Service Agents. Before proceeding with any work, you should read, in its entirety, the repair
procedure you wish to perform to determine if you have the necessary tools, instruments and skills required
to perform the procedure. Procedures for which you do not have the necessary tools, instruments and
skills should be performed only by a trained Authorized Traulsen Service Agent.

Reproduction or other use of this Manual, without the express written consent of Traulsen, is prohibited.

FORM NUMBER TR35845 - REVISED. 12/04

TABLE OF CONTENTS

I. THE SERIAL TAG 1

II. GENERAL INFORMATION

a. Introduction 2
b. Model Designations 2
c. Wiring Diagrams 2
d. Installation - See Owner’s Manual 2
e. Cleaning 2
f. Tools 2
g. Refrigeration System Theory Of Operation 2
h. Air Flow Requirements 3
i. Control Location 3
j. Specifications 3
k. Operating Data Chart 3

III. REMOVAL & REPLACEMENT OF PARTS

a. Standard Incandecent Lights 3
b. Louver Assembly 3
c. Evaporator Housing Cover 4
d. Removing The Door 4
e. Door Hinge 4
f. Snap-In Door Gaskets 5
g. Condensate Drain Pan 5
h. Door Breaker Caps 5

IV. REPLACING THE...

a. CONDENSER FAN MOTOR AND/OR BLADE 6
b. CONDENSER COIL 6
c. COMPRESSOR 7
d. DOOR BREAKER CAPS 7

V. SERVICE PROCEDURES & ADJUSTMENTS

a. System Access 8
b. Sweat On Piercing Valves 8
c. Refrigerant Leak Check 8
d. Evacuating System 8-9
e. Charging System 9
f. System Clean-up 9-10
g. Heater Test/Door Perimeter Heater 10
h. Heater Test/Defrost Heater 10

VI. ELECTRICAL OPERATION

a. Sequence Of Operation/Normal Operation 11
b. Sequence Of Operation/Defrost Mode 11
c. Component Function 11

VII. WIRING DIAGRAMS 12

VIII. PARTS LISTING 13

IX. TROUBLESHOOTING 14

For Questions Please Contact Traulsen Service At:

[phone]

FORT WORTH, TX.

SERIAL MODEL
VOLTS Hz PH

TOTAL CURRENT AMPS
MINIMUM CIRCUIT AMPS
MAXIMUM OVERCURRENT PROTECTION AMPS
LIGHTS WATTS
HEATERS AMPS

REFRIGERANT TYPE OZ
DESIGN PRESSURE HIGH LOW

REFRIGERANT TYPE OZ
DESIGN PRESSURE HIGH LOW

370-60294-00 REV (A)

I. THE SERIAL TAG

The serial tag is a permanently affixed sticker on
which is recorded vital electrical and refrigeration data
about your Traulsen product, as well as the model
and serial number. This tag is located in the upper
right interior compartment on all reach-in/pass-thru
and roll-in/roll-thru refrigerator, freezer and dual-temp
models.

READING THE SERIAL TAG

• Serial = The permanent ID# of your Traulsen

• Model = The model # of your Traulsen

• Volts = Voltage

• Hz = Cycle

• PH = Phase

• Total Current = Maximum amp draw

• Minimum Circuit = Minimum circuit required

• Lights = Light wattage

• Heaters = Heater amperage

• Refrigerant = Refrigerant type used

• Design Pressure = High & low side operating

pressures and refrigerant charge

• Agency Labels = Designates agency listings

-1-

II. GENERAL INFORMATION

II. a - INTRODUCTION:
This manual applies to the following Traulsen
product types:

R-Series Reach-In Even-Thaw Models

II. b - MODEL DESIGNATIONS:
The first letter indicates the series, “R”

R = Stainless Steel Exterior & Interior

The next two letters indicate the product type

ET = Even-Thaw Refrigerator

The first number indicates the number of sections

2 = Two Section

The next two numbers indicates the product depth

32 = 32” Deep Over Body (not including hardware)

The next letter indicates the product width

N = 2 Section: 52-1/8”

If “UT” is present the product is self-contained. If
“UT” is not present the product is remote.

II. c - WIRING DIAGRAM:
Refer to the wiring diagram for any service work per­formed on this unit. The copy contained in this book­let is for standard 115/60/1 voltage, self-contained,
incandescent light equipped models only. Other volt­ages and feature/options sets are not necessarily
covered by the diagrams contained within. Should
you require a wiring diagram for a specific unit,
please contact Traulsen Service at [phone],
and provide the model and serial number of the unit
involved.

II. d - INSTALLATION:
Generally R-Series refrigeration products are in­stalled by the dealer or others contracted by the
dealer or owner. Detailed installation instructions
are included with each unit.

TOOL REQUIREMENTS:

II. f ­For most jobs a standard set of hand tools, a VOM and
AC current tester, along with a temperature tester or
thermometer are adequate. However in some cases
the following additional tools may be required as well:

• Refrigeration Guage Manifold

• Refrigeration Reclaiming Equipment

• Acetylene Torch

• Anti-Static Grounding Kit (TL 84919)

• Nitrogen Bottle With Gauges

• Thin 5/16” Open End Wrench

• Refrigerant Reclaim Unit

II. g -

REF’N SYSTEM - THEORY OF OPERATION:

The refrigeration system is the mechanism whereby
heat is transferred from the cabinet to the outside air.
It works under the principle that the heat moves from
hot to cold as it tries to establish equilibrium.

The temperature control control signals a need for heat
to be removed from the cabinet. The compressor be­gins by compressing the refrigerant gas as it is dis­charged. The high pressure refrigerant now circulates
through the condenser, removing heat from the refrig­erant and condensing it into a liquid. From there the
refrigerant flows to the filter drier which removes all
traces of moisture and particles from the system.

After the filter drier, the refrigerant passes through a
“metering device.” Traulsen uses a thermostatic ex­pansion valve to regulate the flow of refrigerant into
the evaporator coil.

In the evaporator coil, heat is transfered from the cabi­net to the refrigerant, which changes from a cold liq­uid to a warm low pressure gas. When the desired
cabinet air temperature has been reached, the tem­perature control shuts off the compressor.

II. e - CLEANING:
Detailed cleaning instructions are included with each
unit, however special care MUST be given to the con­denser coil. The condenser coil must be cleaned at
a minumum of every six months. Your particular
application may require more frequent intervals. This
can be done with a vacuum cleaners using a brush
attachment, or a stiff brush or wisk broom. For more
information please refer to

the Owner’s Manual sup-

plied with the unit.

Your Traulsen unit may incorporate a washable, re­usable wire mesh filter on the condensing unit. Clean
it with soap and water or in a dishwasher.

Fig. 1 - The Traulsen Refrigeration System

-2-

II. GENERAL INFORMATION (cont’d)

II. h - AIR FLOW REQUIREMENTS:
In order to assure optimum performance, the condens­ing unit of your Traulsen unit MUST have an adequate
supply of air for cooling purposes. Therefore, the op­erating location must either have a minimum of 12”
clearance overhead of the condensing unit or allow
for unrestricted air flow at the back of the unit. The
louver panel must remain free and clear of obstruc­tion. The condenser coil must be kept clean (see II. e).

Please note that clearance of at least 12” above is re­quired in order to perform certain maintenance tasks.

III. REMOVAL & REPLACEMENT OF

BASIC PARTS

WARNING: DISCONNECT THE ELECTRICAL POWER

TO THE MACHINE AT THE MAIN CIRCUIT BOX.

PLACE A TAG ON THE CIRCUIT BOX INDICATING

THE CIRCUIT IS BEING SERVICED.

III. a - STANDARD INCANDESCENT LIGHTS:
Lights are usually located in the front center of the unit,
mounted on the interior top. To replace the light bulb,
first remove the light cover by squeezing the sides to­gether, which releases the tabs from the holding slots.
Replace the burned out light bulb with a similar type
appliance bulb.

II. i - CONTROL LOCATION:
On all Even-Thaw refrigerator models, the temperature
control is located on the evaoprator housing behind
the louvers.

II. j - SPECIFICATIONS:

R-Series Even-Thaw Refrigerator

ET232N

Horsepower 1/2 HP

Condensing Unit - BTU/HR 4750

Condensing Unit Amp Draw 10.0

Fan, Lights, Etc. Amp Draw 5.0

Refrigerant R-404A

Refrigerant Charge (oz.) 20

II. k - OPERATING DATA CHART:

Even-Thaw Models (Cabinet Temperature Set at 38°F)
AMBIENT 70°F 100°F

SUCTION PRESSURE 45 PSIG 50 PSIG

SUCTION TEMPERATURE 11°F15°F

DISCHARGE PRESSURE 240 PSIG 360 PSIG

DISCHARGE TEMPERATURE 100°F 130°F

To replace the light cover, squeeze the sides together
and reinsert tabs in to the holding slots and release to
lock in place.

III. b -

LOUVER ASSEMBLY:
To remove the louver assembly, first remove the two
screws located on both sides at the bottom of the lou­ver assembly (see figure 2). Once the screws are re­moved, the panel can be pivoted upwards allowing full
access to the front facing condenser (see figure 3).

Fig. 2

Remove Screws

Fig. 3

Lift-Up Louvers

When finished, lower the louver assembly and replace
the screws to hold it in place.

-3-

III. REMOVAL & REPLACEMENT OF BASIC PARTS (cont’d)

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE

AND FOLLOW LOCKOUT/TAGOUT PROCEDURES.

EVAPORATOR HOUSING COVER:

III. c ­Remove the screws on top of the evaporator housing.
Lift-off the housing cover to complete removal (see
figure 4).

Fig. 4

Lift-Off Cover

Reverse the procedure when done to reinstall, mak­ing sure that the gasket forms a tight seal.

III. d -

REMOVING THE DOOR:
The door can be easily removed from the cabinet. To
remove the door, remove the plug at the bottom of the
top hinge. Inside the hinge there is a small screw which
secures the door in place. Remove this with a flat head
screwdriver and the door can then be lifted off the
hinge (see figure 5).

III. e - DOOR HINGE:
The hinge can be easily removed from the cabinet. To
remove the door, follow the instructions listed in sec­tion “III. d.”

To remove the door portion of the hinge from the door,
lift off the hinge cover and then remove the three
Phillips head screws which secure the hinge in place
on the door (see figure 6). To remove the cabinet por­tion of the hinge, remove the three Phillips head screws
which hold it in place. On solid door units, the top
hinge(s) contains a microswitch for controlling the
interior lighting.

Fig. 6

To reassemble the hinge reverse the previous proce­dure.

Fig. 5

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