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X. 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. 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.
X. b-SWEAT-ON PIERCING VALVES:
NOTE: Sweat-on piercing valves are used for system
diagnostics, but may be left on after service is com-
plete. 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 process tube. Follow the
installation instructions provided by the manufacturer of
the piercing valve.
2) When complete, follow the guidelines as outlined under
“REFRIGERATION LEAK CHECK” and “EVACUATING
SYSTEM.”
X. 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 re-
frigerants, be certain the work area is well ven-
tilated. 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 Recom-
mended 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
III. a).
2) Attach gauge manifold set to the system, low side to
process tube on the compressor and the high side to
the process tube.
3) Connect refrigerant bottle to the center of gauge
manifold and open the valve on the bottle. Bleed charg-
ing 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.
X. c-REFRIGERANT LEAK CHECK (cont’d):
NOTE: The use of a nitrogen regulator 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
“X. d - EVACUATING SYSTEM”).
11) Charge the system by weighing in the exact charge
and check for proper operation.
X. 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 mois-
ture 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
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.
• 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.” See page 9.
• Evacuate to 200 microns.
PROCEDURE
Disconnect the electrical power to the machine
at the main circuit box. Place a tag on the circuit box indicat-
ing 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.
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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