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

-4-

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

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE

AND FOLLOW LOCKOUT/TAGOUT PROCEDURES.

III. f - DOOR GASKETS:
To remove the gasket to be replaced, grasp it firmly by
one corner and pull it out. Before attempting to install
a new gasket, both the unit and the gasket itself must
be at room temperature. Insert the four corners first
by using a rubber mallet (or hammer with a block of
wood). After the corners are properly inserted, work
your way towards the center from both ends by gently
hitting with a mallet until the gasket is completely
seated in place (see figure 7 for proper gasket place­ment).

Fig. 7

Gasket Detail

III. h - DOOR BREAKER STRIPS:
The door breaker strips can be removed to provide
access to the door perimeter heaters. All cabinet
heater wires are face mounted as shown in figure 8.
Face mounted heater wires are located inside the
foam. Replacement of heater wires can be performed
by following procedure “IV. g - REPLACING THE ANTI­CONDENSATE DOOR PERIMETER HEATERS.”

To remove the four breaker strips from around a door
frame, unscrew the sheet metal screws along the front
and back of each.

After removeing all the screws, the breaker strip will
still be firmly mounted to the cabinet foam insulation.
Gently lift the breaker strip away from the cabinet to
remove.

Reverse the procedure to re-install breaker strips.

NOTE: The gasket may appear too large, but if it is
installed as indicated above it will slip into place.

III. g -

DRAIN PAN:

To remove the drain pan, begin by removing the evapo­rator housing cover as outlined in section “III. c.” Next,
remove the screws and brackets which secure the
drain pan, and remove the drain tube from the drain
pan. Finish by sliding the drain pan out from under
the coil.

Reverse the procedure to install.

Fig. 8

Heater/ Breaker Cap Detail

-5-

IV. a - REPLACING THE CONDENSER

FAN MOTOR AND/OR BLADE

IV. b - REPLACING THE CONDENSER

COIL

WARNINGS:

1) DISCONNECT THE ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.

STEP 1: Remove the louver assembly completely.

STEP 2: Remove the screws holding the fan motor

bracket to the compressor mounting base.

STEP 3: Remove the blade from the motor shaft by

removing the nut.

NOTE: Install the concave side of the fan blade
toward the motor.

NOTE: If the blade is all that is being replaced,
stop here and reverse procedure to install.

STEP 4: Remove the mounting bracket from the

motor

STEP 5: Disconnect the lead wires at the

compressor junction box.

STEP 6: Reverse the procedure to install.

WARNINGS:

1) DISCONNECT THE ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.

2) THIS PROCEDURE REQUIRES THE USE OF REFRIG­ERANTS. BE CERTAIN THE WORK AREA IS WELL
VENTILATED. SAFETY GOGGLES AND GLOVES
SHALL BE WORN SINCE REFRIGERANTS MAY CAUSE
BURNS TO THE SKIN.

STEP 1: Remove the louver assembly completely.

STEP 2: Recover the refrigerant in the system

following the current EPA Guidelines for
refrigerant recovery.

NOTE: The use of reclaiming equipment is required.

STEP 3: Disconnect the input and output lines to

the condenser coil at the soldered joints
closest to the condenser.

STEP 4: Remove the four (4) screws which secure

the condenser coil to the condensing unit
base and remove the coil from the cabinet.

STEP 5: Remove the shroud from the coil for

installation to the new coil.

STEP 6: Reverse the procedure to install the new

fan motor.

STEP 7: Install a new drier.

STEP 8: Charge the refrigeration system as outlined

under “CHARGING SYSTEM” in “SERVICE
PROCEDUES AND ADJUSTMENTS.”

STEP 9: Reconnect power to the unit.

-6-

IV. c - REPLACING THE

COMPRESSOR

IV. d - REPLACING THE DOOR

PERIMETER HEATERS

WARNINGS:

1) DISCONNECT THE ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.

2) THIS PROCEDURE REQUIRES THE USE OF REFRIG­ERANTS. BE CERTAIN THE WORK AREA IS WELL
VENTILATED. SAFETY GOGGLES AND GLOVES
SHALL BE WORN SINCE REFRIGERANTS MAY CAUSE
BURNS TO THE SKIN.

STEP 1: Recover the refrigerant in the system

following the current EPA Guidelines for
refrigerant recovery.

NOTE: The use of reclaiming equipment is required.

STEP 2: Remove the compressor junction box cover.

STEP 3: Disconnect all wire leads coming into the

junction box.

STEP 4: Disconnect the input and output lines to the

compressor.

STEP 5: Remove the compressor which is secured by

four (4) nuts.

WARNINGS:

1) DISCONNECT THE ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.

STEP 1: Remove the four stainless steel breaker strips

around the door perimeter by removing the
screws which secure each to the cabine.

STEP 2: Disconnect lead wires and ground to heater

from the unit.

STEP 3: On the replacement heater, remove the paper

backing and install in door frame behind front
flange screw holes.

STEP 4: Take care not to pinch the heater wires at the

corners of the door frame channel.

STEP 5: Connect the lead wires and attach the ground

wire.

STEP 6: Replace and secure the four stainless steel

breaker strips to the door frame. Be careful
not to force the breaker caps into the corners.

STEP 6: Install the new compressor and connect the

input and output lines.

STEP 7: Connect the lead wires at the junction box.

STEP 8: Install a new drier.

STEP 9: Charge the refrigeration system as outlined

under “CHARGING SYSTEM” in “SERVICE
PROCEDUES AND ADJUSTMENTS.”

STEP 10: Reconnect power to the unit.

-7-

V. SERVICE PROCEDURES & ADJUSTMENTS

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE
NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

V. a -

SYSTEM ACCESS:
All external indicators should be checked as part of
system diagnosis before determining the refrigerant
pressures. Improper access may expose the refriger­ant to contaminates and non-condensables which will
result in system failure.

V. b - SWEAT-ON PIERCING VALVES:
NOTE: Sweat-on piercing valves are used for system
diagnostics, but may be left on after service is com­plete. They may be installed while the system is fully
charged.

1) Place one piercing valve on the compressor pro­cess tube and one on the liquid line drier process tube.
Follow the installation instructions provided by the
manufacturer of the piercing valve.

2) When complete, follow the guidelines as outlined
under “LEAK CHECK” and “EVACUATING SYSTEM.”

V. c - REFRIGERANT LEAK CHECK:
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.

THIS PROCEDURE REQUIRES THE USE OF REFRIG­ERANTS. BE CERTAIN THE WORK AREA IS WELL
VENTILATED. SAFETY GOGGLES AND GLOVES
SHALL BE WORN SINCE REFRIGERANTS MAY CAUSE
BURNS TO THE SKIN.

NOTE: The use of R-22 in small quantities is recom­mended as a trace gas for leak detection.

NOTE: This leak check procedure is to be used only
after the refrigerant has been properly reclaimed.

1) Access the refrigeration system (note: see section
“V. a - SYSTEM ACCESS”).

2) Attach gauge manifold set to the system, low side
to process tube on the compressor and the high side
to the process tube on the drier.

3) Connect refrigerant bottle to the center of gauge
manifold and open the valve on the bottle. Bleed charg­ing hose at the manifold gauge to remove air from the
system.

4) Open valve on low side of gauge manifold and
charge system with one ounce of R-22.

5) Close low side valve on gauge manifold and the
valve on the refrigerant bottle.

6) Disconnect refrigerant bottle and connect nitrogen
bottle.

V. c - REFRIGERANT LEAK CHECK (cont’d):
NOTE: The use of a nitrogen requlator is required.

7) Set output valve on nitrogen valve to 120 psi.

8) Open nitrogen bottle valve and low side gauge mani­fold valve. Allow pressure to equalize.

9) Shut off both valves and disconnect nitrogen bottle.

10) Use a leak detector or a thick soapy solution and
check for leaks at all tubing connections.

A - If leaks are found, repair leaks and repeat process.

B - If no leaks are found, evacuate system as outlined
in section “V. d - EVACUATING SYSTEM”).

11) Charge the system and check for proper opera­tion.

V. d - EVACUATING SYSTEM:
Introduction - Refrigeration reclaiming equipment is
required. Our goal in system evacuation is to remove
all the non-condensables possible. No evacuation
method will remove 100% of the moisture and air from
within the refrigeration circuit. Because of this, guide­lines and methods must be developed and adhered to
ensuring only harmless amounts of contaminants re­main in the system.

GUIDELINES
WARNING - DO NOT PRESSURIZE SYSTEM ABOVE
150 PSIG. PRIOR TO EVACUATION OR DURING LEAK
TEST PROCEDURES.

• Use only a two stage vacuum pump (2 CFM or

greater) and electronic micron gauge.

• Evacuate from high and low sides of the system.

• No chemical additive or alcohols are to be used to

“dry up” a system.

• Blow down of system with DRY NITROGEN prior to

evacuation is acceptable and many times desirable.
See “System Clean-Up.”

• Evacuate to 200 microns.

-8-

VI. SERVICE PROCEDURES & ADJUSTMENTS (cont’d)

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE
NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

V. d - EVACUATING SYSTEM/GUIDELINES (cont’d):

PROCEDURE
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.

WARNING: THIS PROCEDURE REQUIRES THE USE OF
REFRIGERANTS. BE CERTAIN THE WORK AREA IS
WELL VENTILATED. SAFETY GOGGLES AND
GLOVES SHALL BE WORN SINCE REFRIGERANTS
MAY CAUSE BURNS TO THE SKIN.

1) Access the refrigeration system as outlined under
“SYSTEM ACCESS.”

2) Connect low (blue) side of gauge manifold to
schrader valve on compressor process line and high
(red) side of gauge manifold to schrader valve on fil­ter/drier process line.

3) Connect center line of gauge manifold to vacuum
pump.

4) Turn vacuum pump on and open both sides of gauge
manifold.

5) Pull a vacuum to 200 microns.

6) Break the vacuum with 3 psig of dry nitrogen.

7) Repeat steps 5 and 6.

8) Pull vacuum to 200 microns.

9) Charge system and check for proper operation.

V. e - CHARGING SYSTEM:
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.

WARNING: THIS PROCEDURE REQUIRES THE USE OF
REFRIGERANTS. BE CERTAIN THE WORK AREA IS
WELL VENTILATED. SAFETY GOGGLES AND
GLOVES SHALL BE WORN SINCE REFRIGERANTS
MAY CAUSE BURNS TO THE SKIN.

1) Access the refrigeration system.

2) Attach gauge manifold set to system, low side to
process tube on the compressor and the high side to
the process tube on the drier.

NOTE: See “SYSTEM ACCESS.”

CHARGING SYSTEM (cont’d):

V. e -

3) Be sure the system is properly leak checked and
evacuated before charging as outlined under “LEAK
CHECK” and “EVACUATING SYSTEM.”

4) Make certain both valves are closed on the gauge
manifold. Open the valve on the bottle. Bleed charg­ing hose at the manifold gauge to remove air.

NOTE: Initially charge system through high side to
prevent liquid refrigerant from reaching compressor.

5) Open the high side gauge valve (red). Allow refrig­erant to flow into the system until the nameplate charge
is reached or until the high side will not accept any
more refrigerant. At this point, shut the gauge and
bottle valves.

6) Reconnect power to the unit and check for proper
operation and high pressure leaks.

7) Add the remaining amount of refrigeration charge
through the low side with the compressor running.

8) Check for proper operation and leaks.

9) Disconnect power to the unit and replace any cov­ers removed.

V. f -

SYSTEM CLEAN UP/INTRODUCTION:
When a compressor burn-out or moisture infiltration
is encountered, the service person must make the
determination as to the degree of system contamina­tion. Normally a compressor burn-out will fit into one
of three catagories:

• CONTAINED - compressor oil not acidic, no oil dis

coloration.

• CONTAMINATED COMPRESSOR - oil acidic,

discoloration of oil, contamination limited to
compressor.

• MASSIVE CONTAMINATION - contaminated oil

and/or refrigerant pumped through system.

CONTAINED

1) Replacement of liquid line drier.

2) Install suction filter drier for clean up and then re­move it when service is complete. Usually within 48
hours.

3) Replacement of compressor.

4) Evacuation (to 200 microns).

5) Charge by weight.

CONTAMINATED COMPRESSOR
The “contaminated compressor” requires the same
procedure as the “contained” burn-out. Plus, the sys-
tem must be flushed with nitrogen after the compres­sor and drier has been removed.

-9-

V. SERVICE PROCEDURES & ADJUSTMENTS (cont’d)

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE
NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

V. f - SYSTEM CLEAN UP/INTRODUCTION (cont’d):

MASSIVE CONTAMINATION
The replacement compressor MUST NOT be installed
until after system clean-up procedures have been com­pleted.

1) Remove the burned-out compressor as outlined
under “COMPRESSOR” in “Section IV. f”.

2) Remove the TXV metering device.

3) Purge nitrogen through the high and low sides of
system until moisture and contaminated oil has been
removed from the remaining components of the sys­tem.

4) Reassemble refrigeration system and add an CW
style liquid drier and a suction line drier.

5) Purge nitrogen through the high and low sides of
system for 5 minutes.

6) Evacuate refrigeration as outlined under “EVACU-
ATING SYSTEM” for 30 minutes. Repeat nitrogen
purge and evacuation two more times.

7) Charge system as outlined under “CHARGING SYS­TEM”. Allow for the increased liquid capacity of the
liquid line drier.

8) Reconnect power and check for proper operation.

9) Disconnect power and install any panels removed.

10) Return between 24 and 48 hours to recover gas,
replace liquid line drier with a CW style drier. Remove
the suction drier, but do not replace.

11) Evacuate and charge system as outlined under
“EVACUATING SYSTEM” and “CHARGING SYSTEM .

V. h - HEATER TEST - DOOR PERIMETER HEATER:

1) Access the heater wire around the door frame.

2) Plug the unit in and verify 120 volt supply to the
heater.

3) The reading should be .25 amp.

V. i - HEATER TEST - DEFROST HEATER:
WARNING: UNPLUG UNIT BEFORE SERVICING.

1) Access the heater lead wire to the defrost heater.

2) Plug the unit in, turn the defrost timer to start a de­frost cycle.

3) Verify 120 volt supply to the heater.

4) The reading should be 3.7 amp.

5) If you want to perform a continuity check:
a. Unplug the unit.
b. Disconnect the lead wires to the heater.
c. Use an ohmmeter to check for 32.4 ohms.

-10-

VI. ELECTRICAL OPERATION

NORMAL OPERATION:

VI. a -

1. Conditions
a) Unit connected to correct voltage.
b) Defrost settings correct.
c) Condensing unit controlled by temperature control.
d) Cabinet at desired temperature.
e) Door perimeter heaters are powered.
f) Evaporator fan powered.
g) Temperature control operating correctly.

2. Cabinet temperature rises above set temperature.
a) Temperature control initiates compressor

operation.

b) Evaporator fan should be ON.

3. Set temperature is met.
a) Conditions return to those outlined in step 1.

VI. b - DEFROST MODE:

1. Conditions
a) Unit operating in normal mode.

2. Defrost initiated by temperature control.
a) Control turns OFF the evaporator fan.

3. Defrost terminated by either: 1) Maximum Set Time
Interval, or 2) Evaporator Coil Temperature.

a) Defrost heater turns OFF.
b) Drain pan heater turns OFF (if so equipped).

4. Cabinet returns to normal operation.

a) Temperature controlled by controller.
b) Evaporator fan stays OFF until evaporator coil

reaches desired temperature.

VI. c - COMPONENT FUNCTION:
Compressor: Pumps refrigerant thru refrigeration system components and com

presses the low pressure vapor to high pressure vapor.

Condenser Fan: Draws air across condenser coil to aid in removing heat from the

refrigerant and moves air across compressor to aid in cooling the
compressor.

Evaporator Blower: Draws air from the cabinet and pulls the air thru the evaporator coil.

Defrost Heater: Defrosts evaporator coil; operates only during defrost cycle.

Start Capacitor: Stores electrical charge which helps start the compressor motor.

Run Capacitor: Helps keep the compressor motor running after starting.

Door Switch: A concealed switch which operates the interior incandescent lights.

Contactor: Controls voltage to compressor motors.

Temperature Controller: Electronic control which regulates the interior temperature of the

cabinet, and powers ON and OFF the auxiliary fans and heaters needed
for even-thaw operation.

Door Perimeter Heater: Heats door opening to prevent condensate from forming.

-11-

VII. WIRING DIAGRAM

-12-

VIII. PARTS LISTING

NOTE: Part numbers listed are for standard products as currently manufactured. For products manufactured

as other than standard, or for older production units, please contact the factory.

PART
NO. NAME OF PART

HALF LENGTH REACH-IN DOORS

200-60136-00 2-Section “N-Width” Models - Hinged Right
200-60136-01 2-Section “N-Width” Models - Hinged Left

FULL LENGTH REACH-IN DOORS

200-60135-00 2-Section “N-Width” Models - Hinged Right
200-60135-00 2-Section “N-Width” Models - Hinged Left

DOOR GASKETS

341-60060-00 Gasket-Half Length 2-Section “N-Width” Models
341-60259-00 Gasket-Full Length 2-Section “N-Width” Models

DOOR LOCKS

346-28924-42 Lock Keys T-42
346-13186-42 Lock Cylinder
346-13189-00 Lock Bolt
SER-60443-00 Lock Keeper Reach-In
SER-60434-00 Lock Keeper Roll-in

OTHER

378-60013-00 Alarm Indicator Light
337-60006-00 Start Capacitor
337-60032-00 Terminal Block
337-31075-02 Thermal Fuse
329-60048-00 Mullion Heater
333-60051-00 Blower Harness
601-60809-00 Panel Air Duct
601-60811-00 Cover Air Duct
601-60814-00 Channel Heaters
344-60126-00 Thermometer
337-60311-00 Heater Relay
337-60324-00 2-Pole Relay, 30 Amp
337-60309-00 Transformer
337-60308-00 Temperature Sensor

TRAY SLIDES

701-60032-00 No. 1 Type Tray Slide

LOUVER ASSEMBLY

500-60138-06 2-Section “N” Reach-In Models
351-15822-02 Louver Screws For All Above

CABINET SUPPORTS

344-13168-01 6” High Adjustable Stainless Steel Leg
344-13140-01 6” High Locking Caster
351-15822-02 Caster Bolts For Above

HINGES

SER-28583-00 Door Hinge
344-28484-00 Actuator

TEMPERATURE CONTROL

324-60027-00 Even-Thaw Control

LIGHTS

333-60241-00 Lamp Holder 56” LG
337-30858-00 Light Cover, Flush Mounted
378-29776-00 Incandescent Light Bulb

-13-

IX. TROUBLESHOOTING

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL AND REFRIGERA-

TION SYSTEM TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXEERCISE
EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

Compressor will not run, compressor has no current draw. 1. Main circuit breaker open.

Compressor will not run, current draw and trips overload. 1. Low voltage.

Compressor short cycles on overload. 1. Low voltage.

Compressor short cycles. 1. Improper air flow over evaporator coil.

Continuous unit operation. 1. Loss of refrigerant.

Compressor run time lengthy. 1. Partial loss of refrigerant.

Low suction pressure. 1. Expansion valve restricted.

High head pressure. 1. Improper air flow across condenser.

Coil icing. 1. Number of defrost cycles too few.

Sensor Light Illuminated 1. Slow or inadequate thawing - Check position of Cool/

Moisture Condensing Around Door Perimeter 1. Excessively humid environment - Turn on Door

2. Compressor overload tripped.

3. Cabinet temperature satisfied.

4. Wired wrong or faulty connection.

5. Temperature control malfunction

6. Start component malfunction.

7. Compressor motor windings open.

2. Start component malfunction.

3. Compressor windings shorted.

4. Locked rotor.

5. Excessive discharge pressure.

2. Low refrigerant charge.

3. Dirty condenser coil.

4. Wired wrong or faulty connection.

5. Condenser fan inoperative.

6. Run capacitor malfunction.

7. Start component malfunction.

8. Temperature control malfunction

9. High head pressure.

2. Low ambient conditions.

3. Temperature control malfunction1.

4. Bad sensors.

5. Temp differential set too close.

2. Excessive door openings.

3. Temperature control malfunction1.

4. Broken compressor valves.

5. Very dirty condenser.

2. High ambient conditions.

3. Dirty condenser coil or improper air flow over
condenser coil.

4. Excessive product load.

5. Excessive door openings.

6. Door gasket requires replacement.

7. Temperature control malfunction1.

8. Contaminates in refrigeration system.

9. Compressor valve leakage.

10. Inadequate defrost cycle.

2. Drier plugged.

3. Loss of refrigerant.

4. Poor air flow.

5. Iced evaporator coil.

2. High ambient conditions.

3. Overcharge of refrigerant.

4. Air in system.

5. Dirty condenser coil.

2. Defrost duration too short.

3. Cabinet air leak.

4. Drain tube plugged.

5. Defrost heater not working.

6. Non-frozen product put into cabinet.

7. Coil sensor failure.

Thaw switch.

perimeter heaters using defogger switch.

1

.

1

.

-14-