Traulsen ULT27 - User Manual

Traulsen Refrigeration
SERVICE MANUAL #01
Instructions For The Troubleshooting And
Repair Of Traulsen Compact Undercounter
Refrigerator, Freezer & Prep Table Models
FORM NUMBER TR35751 - REV. 5/03
27”, 48” & 60” Compact Undercounter Refrigerator Models
27”, 48” & 60” Compact Undercounter Freezer Models
27”, 48” & 60” Compact Prep Table Models
-NOTICE-
This Manual is prepared for the use of trained Authorized Traulsen Service Agents and should not be used
by those not properly qualified, nor should the equipment for which it is prepared be adjusted or repaired by
anyone except properly qualified personnel. 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. Reproduction or other use of this Manual, without the express written
consent of Traulsen & Co., Inc. is prohibited.
Traulsen
4401 Blue Mound Road Fort Worth, TX 76106
Phone: (800) 825-8220 Fax-Svce: (817) 740-6757
Website: www.traulsen.com
HOURS OF OPERATION:
Monday thru Friday 7:30 am - 4:30 pm CST
Quality Refrigeration
VI. TROUBLESHOOTING
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL AND REFRIGERATION SYS-
TEM TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAU-
TION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST
EQUIPMENT AND REAPPLY POWER TO TEST.
Compressor will not run, no current draw. 1. Compressor circuit breaker open.
2. Cabinet temperature satisfied.
3. Wired wrong or faulty connection.
4. Start component malfunction.
5. Compressor motor windings open.
6. Thermostat malfunction.
7. High pressure control tripped.
Compressor will not run, current draw and trips overload. 1. Low voltage.
2. Start component malfunction.
3. Compressor windings shorted.
4. Locked rotor.
5. Excessive head pressure.
Defrost time too long. 1. Defrost timer malfunction.
Compressor short cycles on overload. 1. Low voltage.
2. Improper air flow over condenser.
3. Low refrigerant charge.
4. Compressor electrical component malfunction.
5. High head pressure.
Compressor short cycles on thermostat. 1. Improper air flow over evaporator coil.
2. Low ambient conditions.
3. Thermostat bulb improperly located.
4. Thermostat malfunction.
Continuous unit operation. 1. Loss of refrigerant.
2. Excessive door openings.
3. Thermostat malfunction.
4. Compressor inoperative.
Compressor run time lengthy. 1. Partial loss of refrigerant.
2. High ambient conditions.
3. Improper air flow over condenser coil.
4. Excessive product load.
5. Excessive door openings.
6. Door gasket inoperative.
7. Contaminates in refrigeration system.
8. Compressor malfunction.
Low suction pressure. 1. Restriction in drier.
2. Loss of refrigerant.
3. Poor air flow.
High head pressure. 1. Improper air flow across condenser.
2. Extreme ambient conditions.
3. Overcharge of refrigerant.
4. Air in system.
Will not defrost. 1. Defrost heater malfunction.
2. High limit thermostat open.
3. Defrost timer inoperative.
4. Wired wrong or faulty connection.
Coil icing. 1. Gasket leaking.
2. Drain tube plugged.
3. Non-frozen product in freezer.

Summary

V. REMOVAL & REPLACEMENT OF PARTS

V. c - THERMOSTAT

Procedures for removing and replacing the thermostat on 27" and 48"/60" models.

V. d - DOOR GASKET

Instructions for removing and installing door gaskets.

V. e - DOOR

V. f - DOOR HINGE MECHANISM

V. g - DEFROST TIMER

V. h -HEATERS

V. i - DOOR FRAME HEATER

V. j - CONDENSING UNIT COMPONENTS

V. k- EVAPORATOR FAN MOTOR

V. l - CONDENSER COIL

Procedures for removing and replacing the condenser coil.

V. m - COMPRESSOR

Procedures for removing and replacing the compressor.

V. n - CONDENSER FAN ASSEMBLY

V. o- EVAPORATOR COIL

Procedures for removing and replacing the evaporator coil.

VI. SERVICE PROCEDURES & ADJUSTMENTS

VI. d - REFRIGERANT LEAK CHECK

Procedures for performing a refrigerant leak check.

VI. e - EVACUATING SYSTEM

Guidelines and procedures for evacuating the refrigeration system.

VI. f - CHARGING SYSTEM

Procedures for charging the refrigeration system.

VI. g - SYSTEM CLEAN UP;INTRODUCTION

Procedures for system clean-up after compressor burn-out or contamination.

VI. h - DOOR ADJUSTMENT

VI. i - REHINGING DOOR

VI. j - DEFROST TIMER SETTING

VII. ELECTRICAL OPERATION

VII. a- COMPONENT FUNCTION

VII. b - SEQUENCE OF OPERATION

VIII. WIRING DIAGRAMS - 27 MODELS

VIII. WIRING DIAGRAMS - 48 & 60 MODELS

VI. TROUBLESHOOTING

Compressor will not run, no current draw.

Lists potential causes for a compressor not running with no current draw.

Compressor will not run, current draw and trips overload.

Lists potential causes for a compressor running but tripping the overload.

Defrost time too long.

Compressor short cycles on overload.

Lists potential causes for the compressor short cycling on overload.

Compressor short cycles on thermostat.

Lists potential causes for the compressor short cycling on the thermostat.

Continuous unit operation.

Compressor run time lengthy.

Low suction pressure.

Lists potential causes for low suction pressure in the system.

High head pressure.

Lists potential causes for high head pressure in the system.

Will not defrost.

Lists potential causes for the unit not defrosting.

Coil icing.

Lists potential causes for evaporator coil icing.

Traulsen ULT27 Specifications

General

Category	Refrigerator
Model	ULT27
Type	Undercounter Freezer
Voltage	115V
Defrost Type	Automatic
Door Swing	Right
Construction	Stainless Steel
Number of Sections	1
Door Type	Solid