Traulsen TU044HT, TU072HT, TU044LT, TU072LT, TU100HT User Manual
Traulsen Refrigeration
SERVICE MANUAL
Instructions For The Troubleshooting And
Repair Of Traulsen Full-Size Undercounter
Refrigerators and Freezers
TU044HT, TU072HT & TU100HT Refrigerator Models
TU044LT & TU072LT Freezer Models
This manual is prepared for the use of trained Authorized Traulsen Service Agents and should not be used by
those not properly qualied. 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. Only a trained Authorized Traulsen Service Agent should perform procedures for which you do
not have the necessary tools, instruments and skills. Reproduction or other use of this manual without the
express written consent of Traulsen, is prohibited.
FORM NUMBER TR35912 REV. 7/09 P/N 375-60297-00
TABLE OF CONTENTS
I. THE SERIAL TAG Page 1
II. GENERAL INFORMATION Page 2
a-Introduction Page 2
b-Model Designations Page 2
c-Wiring Diagram Page 2
d-Installation Page 2
e-Cleaning Page 2
f-Tool Requirements Page 2
g-Refrigeration System-Theory of Operation Page 2
h-Air Flow Requirements Page 2
i-The Microprocessor Control Page 3
j-Control Location Page 3
k-Operating Data Chart-Refrigerator Page 3
l-Operating Data Chart-Freezer Page 3
m-Specications-Refrigerator Page 3
n-Specications-Freezer Page 3
III. SERVICE ACCESS
a-System Page 3
b-Evaporator Housing Cover Page 4
c-Accessing Start Components Page 4
IV. RE-HINGE DOOR(S) Page 4
V. CONDENSER FAN MOTOR OR BLADE Page 4
VI. CONDENSER COIL Page 5
VII. EVAPORATOR FAN Page 5
VIII. COMPRESSOR Page 6
IX. WIRING DIAGRAM Page 7
X. SERVICE PROCEDURES & ADJUSTMENTS
a-System Access Page 8
b-Sweat-On Piercing Valves Page 8
c-Refrigerant Leak Check Page 8
d-Evacuating System Page 8
e-Charging System Page 9
f-System Clean Up/Introduction Page 9
g-Heater Test-Drawer Perimeter Heater Page 10
XI. ELECTRICAL OPERATION
a-Normal Operation Page 10
b-Defrost Mode Page 10
c-Component Function Page 10
d-Installation Of The Sensors Page 11
XII. TROUBLESHOOTING Page 12
XIII. SERVICE PARTS LIST Page 13
XIV. SERVICE ASSISTANCE Page 14
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 afxed label 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 right interior compartment on
all standard TU Series Full-Size Undercounter models.
See Figure 1.
READING THE SERIAL TAG
• Serial = The permanent ID# of your Traulsen unit
• Model = The model # of your Traulsen unit
• Volts = Voltage
• Hz = Cycle
• PH = Phase
• Total Current = Maximum amp draw
• Minimum Circuit = Minimum circuit ampacity
• Lights = Light wattage
• Heaters = Heater amperage (Hot Food units only)
• Refrigerant = Refrigerant type used
• Design Pressure = High & low side operating
pressures and refrigerant charge
• Agency Labels = Designates agency listings
Figure 1
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II. GENERAL INFORMATION
II. a-INTRODUCTION:
This manual applies to the following models only:
TU Series Full-Size Undercounter Refrigerators
TU044HT, TU072HT & TU100HT
TU Series Full-Size Undercounter Freezers
TU044LT & TU072LT
II. b-MODEL DESIGNATIONS:
TU 044 HT
Positions 1 2 3
Position 1: TU = Traulsen Undercounter
Position 2: 044 = 44” Length Model
072 = 72” Length Model
100 =100” Length Model
Position 3: HT=Refrigerator
LT=Freezer
II. c-WIRING DIAGRAM:
Refer to the wiring diagram for any service work performed on this unit. A copy is placed on the unit when
shipped. Also, a copy of the wiring diagram is located on
page 7 of this manual. Should you require another copy,
or a wiring diagram for an older production unit, please
contact Traulsen Service at (800) 825-8220. You should
have model and serial number of unit prior to calling. See
page 1 for serial tag location and information.
II. f-TOOL REQUIREMENTS (cont’d):
● 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-REFRIGERATION 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 microprocessor 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 ows to the lter drier which removes all traces of moisture
and particles from the system.
After the lter drier, the refrigerant passes through a “metering
device”. Traulsen uses a thermostatic expansion valve to regulate
the ow of refrigerant into the evaporator coils.
In the evaporator coil, heat is transferred from the cabinet to the
refrigerant, which changed from a cold liquid to a warm low pressure gas. When the desired cabinet air temperature has been
reached, the microprocessor control shuts off the compressor.
See gure 2.
II. d-INSTALLATION:
Generally TU Series Full Size Undercounter refrigerators
and freezer units are installed by the dealer, or other
parties contracted by the dealer or owner. Detailed installation instructions are included along with each unit
when shipped.
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 minimum
of every six months. This can be done with a vacuum
cleaner using a brush attachment, or a stiff brush or whisk
broom. For more information on cleaning, please refer
to the Owner’s Manual.
II. f-TOOL REQUIREMENTS:
For most jobs a standard set of hand tools, a VOM and
AC current tester, along with a temperature tester or thermometer are adequate tools. However, in some cases
the following additional tools may be required as well:
Figure 2
II. h-AIR FLOW REQUIREMENTS:
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 allow a
minimum of 12” clearance in front of the louvers to allow for
unrestricted air ow to the condensing unit.
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II. GENERAL INFORMATION (cont’d)
II. i-THE MICROPROCESSOR CONTROL:
For detailed information on replacement, repair or adjustment of
the INTELA-TRAUL® microprocessor control please refer to it’s
manual, form number TR35705 or contact our Service Department at 800-825-8220.
II. j-CONTROL LOCATION:
On all TU Series Full Size Undercounter models, the microprocessor control is located on the louver assembly, right above the
Traulsen nameplate. The louver/refrigeration system are mounted
standard on the left side, but as an option are available on the
right side as well. See gure 3.
Figure 3
II. k-OPERATING DATA CHART-REFRIGERATOR:
II. m-SPECIFICATIONS-REFRIGERATOR:
TU044HT TU072HT TU100HT
HP 1/3 1/3 1/3
Condensing Unit
BTU/HR
Cabinet
Amp Draw
Refrigerant R-404a R-404a R-404a
Refrigerant
Charge (oz.)
2440 2440 2440
6.3 6.3 6.3
19 19 19
II. n-SPECIFICATIONS-FREEZER:
TU044LT TU072LT
HP 1/2 1/2
Condensing Unit
BTU/HR
Cabinet
Amp Draw
Refrigerant R-404a R-404a
Refrigerant Charge
(oz.)
1970 1970
8.0 8.0
18 18
Ambient 700F 1000F
Suction Pressure 35 PSIG 50 PSIG
0
Suction Temperature 3
Discharge Pressure 200 PSIG 295 PSIG
Discharge Temperature 88
F 160F
0
F 1150F
II. l-OPERATING DATA CHART-FREEZER:
Ambient 700F 1000F
Suction Pressure 15 PSIG 17 PSIG
0
Suction Temperature -22
Discharge Pressure 200 PSIG 265 PSIG
Discharge Temperature 88
F -190F
0
F 1070F
III. SERVICE ACCESS
III. a-SYSTEM:
To remove the louver assembly rst place your hands
under the louver panel and lift this up off the bracket and
then away from the cabinet face. NOTE: Figure below
shown with optional refrigerator drawers.
Figure 4
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III. SERVICE ACCESS (cont’d)
V. CONDENSER FAN MOTOR OR BLADE
III. a-SYSTEM(cont’d):
To gain full access to the refrigeration system from the
side, remove the side cover by removing the screws.
Illustration III. 1
When nished, place the louver assembly back into position and replace the side panel. Secure these in place
using the previously removed screws.
III. b-EVAPORATOR HOUSING COVER:
If the unit is supplied with a marine work top, rst remove
the work top by removing the mounting screws on the
left and right side of the work top. Next, remove the #3
Phillips head screws from the top of the evaporator and
cabinet space cover.
V. a-REPLACEMENT INSTRUCTIONS:
Disconnect the electrical power to the machine
and follow lockout/tag out procedures.
Step 1: Remove the louver assembly as outlined in section III.
a. To gain access through left side.
Step 2: Remove the screws holding the fan motor bracket to the
compressor mounting base (see Illustration V.1).
Illustration V. 1
Step 3: Remove the blade from the motor shaft by removing the
nut (see Illustration V. 2).
NOTE: The cover is sealed with RTV which may need
to be scored before removing the cover.
Illlustration III. 2
Reverse the procedure when done, to reinstall.
III. c-ACCESSING START COMPONENTS:
The start components are mounted on the compressor.
To access the start components, rst remove the louver
assembly and side panel as instructed in section III. a.
The start components are mounted on the back side of
the compressor.
IV. RE-HINGE DOOR(S)
Illustration V. 2
NOTE: Install the concave side of the fan blade toward the
motor. 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 (see
Illustration V. 3).
Illustration V. 3
IV. a-DOOR RE-HINGE INSTRUCTIONS:
Your Traulsen Full Size Undercounter model door(s)
are eld re-hingeable. If re-hinging is required, please
contact our Service Department at 800-825-8220 for
re-hinge instructions.
Step 5: Disconnect lead wires at the compressor junction box.
Step 6: Reverse the procedure to install.
Step 7: Reconnect power to the unit.
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