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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 per-
formed 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. 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 in-
stallation 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 ther-
mometer are adequate tools. However, in some cases
the following additional tools may be required as well:
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 re-
frigerant 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 refrig-
erant 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 pres-
sure gas. When the desired cabinet air temperature has been
reached, the microprocessor control shuts off the compressor.
See gure 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 cool-
ing 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.
Figure 2
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Contents Summary of Traulsen

  • Page 1Traulsen 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 Servi
  • Page 2TABLE OF CONTENTS I. THE SERIAL TAG Page 1 V. CONDENSER FAN MOTOR OR BLADE Page 4 II. GENERAL INFORMATION Page 2 VI. CONDENSER COIL Page 5 a-Introduction Page 2 VII. EVAPORATOR FAN Page 5 b-Model Designations Page 2 VIII. COMPRESSOR Page 6 c-Wiring Diagram Page 2 IX. WIRING DIAGRAM Page 7 d-Installa
  • Page 3II. GENERAL INFORMATION II. a-INTRODUCTION: II. f-TOOL REQUIREMENTS (cont’d): This manual applies to the following models only: ● Refrigeration Guage Manifold ● Refrigeration Reclaiming Equipment TU Series Full-Size Undercounter Refrigerators ● Acetylene Torch TU044HT, TU072HT & TU100HT ● Anti-Stati
  • Page 4II. GENERAL INFORMATION (cont’d) II. i-THE MICROPROCESSOR CONTROL: II. m-SPECIFICATIONS-REFRIGERATOR: For detailed information on replacement, repair or adjustment of the INTELA-TRAUL® microprocessor control please refer to it’s TU044HT TU072HT TU100HT manual, form number TR35705 or contact our Serv
  • Page 5III. SERVICE ACCESS (cont’d) V. CONDENSER FAN MOTOR OR BLADE III. a-SYSTEM(cont’d): V. a-REPLACEMENT INSTRUCTIONS: To gain full access to the refrigeration system from the Disconnect the electrical power to the machine side, remove the side cover by removing the screws. and follow lockout/tag out pr
  • Page 6VI. CONDENSER COIL VII. EVAPORATOR FAN VI. a-REPLACEMENT INSTRUCTIONS: VII. a-REPLACEMENT INSTRUCTIONS: Disconnect the electrical power to the Disconnect the electrical power to the machine and follow lockout/tag out procedures. machine and follow lockout/tag out procedures. This procedure requires
  • Page 7VIII. COMPRESSOR VIII. a-COMPRESSOR: Disconnect the electrical power to the machine and follow lockout/tag out procedures. This procedure requires the use of re- frigerants, be certain the work area is well ventilated. Safety goggles and gloves shall be worn since refrig- erants may cause burns to t
  • Page 8IX. WIRING DIAGRAM NOTE: Refer to the wiring diagram below (applies to refrigerators and freezers units) for any service work performed by a qualified technician. -7-
  • Page 9X. SERVICE PROCEDURES & ADJUSTMENTS Certain procedures in this section require electrical test or measurements while power is applied to the machine. Excercise extreme caution at all times. If test points are not easily accessible, disconnect power, attach test equipment and reapply power to test. X
  • Page 10X. SERVICE PROCEDURES & ADJUSTMENTS (cont’d) Certain procedures in this section require electrical test or measurements while power is applied to the machine. Excercise extreme caution at all times. If test points are not easily accessible, disconnect power, attach test equipment and reapply power t
  • Page 11X. PROCEDURES & ADJ. (cont’d) XI. ELECTRICAL OPERATION Certain procedures in this section re- XI. a-NORMAL OPERATION: quire electrical test or measurements while power is 1. Conditions applied to the machine. Excercise extreme caution a) Unit connected to correct voltage (check using a volt me- at a
  • Page 12XI. ELECTRICAL OPERATION (cont’d) XI. c-COMPONENT FUNCTION: COMPONENT FUNCTION 1. Compressor Pumps refrigerant thru refrigeration system components and compresses the low pressure vapor into high pressure vapor. 2. Evaporator Fan Draws air across condenser coil to aid in removing heat from the refri
  • Page 13XII. TROUBLESHOOTING Certain procedures in this section require electrical and refrigeration system 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 t
  • Page 14XIII. SERVICE PARTS LIST NOTE: Part numbers listed are for standard products as currently manufactured. For products manufactured as other than standard, please contact the factory with model and serial number of unit in question. ITEM DESCRIPTION PART NUMBER Casters All Models 6” Adjustable - No Lo
  • Page 15XIV. SERVICE ASSISTANCE XIV. a-SERVICE INFORMATION: NOTE: Before calling for service, please check the following: Is the electrical cord plugged in? Is the fuse OK or circuit breaker on? Clean condenser coil Is the power switch on? Reset microprocessor control values to factory defaults. If after ch
  • Page 16HOURS OF OPERATION: Monday thru Friday 7:30 am - 4:30 pm CST Traulsen 4401 Blue Moud Road Fort Worth, TX 76106 Phone (800) 825-8220 Fax (817) 740-6757 Website: www.traulsen.com Quality Refrigeration © 2009 Traulsen - All Rights Reserved