Traulsen UHT27 Service Manual
Traulsen Refrigeration
SERVICE MANUAL #01
Instructions For The Troubleshooting And
Repair Of Traulsen Compact Undercounter
Refrigerator, Freezer & Prep Table Models
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.
FORM NUMBER TR35751 - REV. 5/03
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
III. SPECIFICATIONS 3
IV. OPERATING DATA 3-4
V. REMOVAL & REPLACEMENT OF PARTS
a-Evaporator Covers 5
b-Condensing Unit Cover 5
c-Thermostat 6
d-Door Gasket 7
e-Door 7
f-Door Hinge Mechanism 7-8
g-Defrost Timer 9
h-Heaters 9
i-Door Frame Heater 10
j-Condensing Unit Components 11
k-Evaporator Fan Motor 11
l-Condenser Coil 12
m-Compressor 13
n-Condenser Fan Assembly 14
o-Evaporator Coil 15
VI. SERVICE PROCEDURES & ADJUSTMENTS
a-System Access 16
b-Bolt On Piercing Valves 16
c-Seat On Piercing Valves 16
d-Refrigerant Leak Check 16
e-Evacuating System 16-17
f-Charging System 17
g-System Clean-Up 17-18
h-Door Adjustment 18
i-Rehinging Door 18-19
j-Defrost Timer Settings 19
k-Door Perimeter Heater Test 19
l-Defrost Heater Test 19
m-Drain Pan Heater Test 19
VII. ELECTRICAL OPERATION
a-Component Function 19
b-Sequence of Operation 20
c-Component Location 20
VIII. WIRING DIAGRAMS - 27” MODELS 21
IX. WIRING DIAGRAMS - 48” & 60” MODELS 22
X. TROUBLESHOOTING Back Cover
MODEL
ML
VOLTS HZ PH
MAXIMUM FUSE SIZE OR MINIMUM CIRUIT
HACR TYPE CIRCUIT BREAKER AMPACITY
REFRIGERANT OUNCES
TYPE MAXIMUM
LIGHT AMPS EVAPORATOR FAN MOTORS QTY.
ANTICONDENSATE HEATER AMPS DEFROST HEATER AMPS
COMPRESSOR RATED LOAD AMPS LRA AMPS
CONDENSER FAN MOTORS QTY FULL LOAD AMPS EACH
COMMERCIAL REFRIGERATOR AND/OR FREEZER
R
286L PLATE NO. 432680-5 DATA NO. 432679-
SN NO. MD
MAX. OPERATING AMBIENT
TOTAL
AMPS
DESIGN
FORT WORTH, TX.
MADE IN U.S.A.
PRESSURE
PSIG
H.S L.S
FULL LOAD
AMPS EACH
AMPSAMPS
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 on the left
side of the interior compartment of all compact
undercounter refrigerator, freezer and prep table
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
models:
UHT27, UHT48 & UHT60 Compact Undercounter
Refrigerator Models
ULT27, ULT48 & ULT60 Compact Undercounter
Freezer Models
UPT276, UPT279, UPT488, UPT4812, UPT4818,
UPT6012, UPT6018 & UPT6024 Compact Prep
Table Refrigerator Models
All of the information, illustrations and specifications contained in this manual are based on the
latest product information available at the time of
printing.
II. b -
MODEL DESIGNATIONS:
The three letter model prefix indicates the type:
UHT = Compact Undercounter Refrigerator
ULT = Compact Undercounter Freezer
UPT = Compact Prep Table
The next two numbers indicate the product width:
27 = 27” Wide Refrigerator, Freezer or Prep Table
48 = 48” Wide Refrigerator, Freezer or Prep Table
60 = 60” Wide Refrigerator, Freezer or Prep Table
TOOL REQUIREMENTS:
II. f For most jobs a standard set of hand tools, a VOM
with 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 Reclaiming Equipment
• Acetylene Torch
• Nitrogen Bottle With Gauges
• Nitrogen Regulator
• Refrigeration Gauge Manifold
• Refrigerant Scale
• Valve Core Removal Kit
The last one or two number indicates the pan
capacity (prep tables only):
6=Six (6) Sixth Size Pan Capacity
8=Eight (8) Sixth Size Pan Capacity
9=Nine (9) Sixth Size Pan Capacity
12 = Twelve (12) Sixth Size Pan Capacity
18 = Eighteen (18) Sixth Size Pan Capacity
24 = Twenty Four (24) Sixth Size Pan Capacity
II. c - WIRING DIAGRAM:
Refer to the wiring diagrams on pages 21 and 22 for
any service work performed on the unit. Should you
require another copy, please contact Traulsen Service at (800) 825-8220, and provide the model and
serial number of the unit involved.
II. d - INSTALLATION:
Generally compact undercounter refrigeration products are installed by the dealer or others contracted
by the dealer or owner. Detailed installation instructions are included with each unit.
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. This can be done
with a vacuum cleaner using a brush attachment, or
a stiff brush or wisk broom. For more information
please refer to section “V. a & b” of the Compact
Undercounter Owner’s Manual.
-2-
III. SPECIFICATIONS
Refrigerant Refrigerant Cond. Unit Amp
Model No. HP Type Charge Draw (LRA) Voltage Amps
UHT27 1/6 R-134a 8 oz. 4.0 120/60/1 3.4
UHT48 1/4 R-134a 12oz. 6.1 120/60/1 6.7
UHT60 1/4 R-134a 12oz. 6.1 120/60/1 6.7
ULT27 1/3 R-134a 9 oz. 7.2 120/60/1 6.7
ULT48 1/3 R-404A 14 oz. 8.9 120/60/1 10.0
ULT60 1/2 R-404A 14 oz. 10.8 120/60/1 12.0
UPT276 1/5 R-134a 9 oz. 4.5 120/60/1 4.3
UPT279 1/5 R-134a 9 oz. 4.5 120/60/1 4.3
UPT488 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT4812 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT4818 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT6012 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT6018 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
UPT6024 1/4 R-134a 12 oz. 6.1 120/60/1 7.0
IV. OPERATING DATA
Refrigerator Model: UHT27
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 43 lb. 43 lb.
End of Cycle 15 lb. 15 lb.
Discharge Pressure
Start of Cycle 68 lb. 71 lb.
End of Cycle 87 lb. 145 lb.
Freezer Model: ULT27
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 11 lb. 11 lb.
End of Cycle 0 lb. 1 lb.
Discharge Pressure
Start of Cycle 84 lb. 120 lb.
End of Cycle 116 lb. 164 lb.
-3-
IV. OPERATING DATAVI. SERVICE PROCEDURES & ADJUSTMENTS (cont’d)
Refrigerator Model: UHT48
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 37 psig 36 psig
End of Cycle 12 psig 15 psig
Discharge Pressure
Start of Cycle 58 psig 130 psig
End of Cycle 102 psig 171 psig
Refrigerator Model: UHT60
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 37 psig 38 psig
End of Cycle 11 psig 21 psig
Discharge Pressure
Start of Cycle 57 psig 109 psig
End of Cycle 99 psig 168 psig
Prep Models: UPT276 & UPT279
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 41 lb. 43 lb.
End of Cycle 21 lb. 20 lb.
Discharge Pressure
Start of Cycle 61 lb. 90 lb.
End of Cycle 118 lb. 174 lb.
Freezer Model: ULT48
Refrigerant R-404A R-404A
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 37 psig 41 psig
End of Cycle 14 psig 20 psig
Discharge Pressure
Start of Cycle 164 psig 250 psig
End of Cycle 210 psig 310 psig
Freezer Model: ULT60
Refrigerant R-404A R-404A
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 39 psig 40 psig
End of Cycle 11 psig 17 psig
Discharge Pressure
Start of Cycle 96 psig 126 psig
End of Cycle 214 psig 308 psig
Prep Models: UPT488, UPT4812 & UPT4818
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 30 psig 32 psig
End of Cycle 12 psig 21 psig
Discharge Pressure
Start of Cycle 89 psig 148 psig
End of Cycle 105 psig 171 psig
Prep Models: UPT6012, UPT6018 & UPT6024
Refrigerant R-134a R-134a
Ambient Temperature 70° F 100° F
Suction Presure
Start of Cycle 29 psig 34 psig
End of Cycle 12 psig 20 psig
Discharge Pressure
Start of Cycle 81 psig 128 psig
End of Cycle 99 psig 169 psig
-4-
V. REMOVAL & REPLACEMENT OF PARTS
WARNING: UNPLUG UNIT BEFORE SERVICING
27” Models
V. a -
EVAPORATOR COVERS:
Begin by removing the shelves from inside the cabinet. In addition on prep tables it will also be necessary to remove the pans and duct work. Next, remove
the screw and lock washer and the canoe clips from
the cover (see figure 1).
NOTE: Lock washer must be installed.
Reverse the procedure to install.
48” & 60” Models
Begin by removing the shelves from inside the cabinet. In addition on prep tables it will also be necessary to remove the pans and duct work. Next, remove
the screws from the evaporator cover (see figure 2).
Reverse the procedure to install.
V. b - CONDENSING UNIT COVER:
Begin by accessing the back of the unit. Next remove
the screws that secure the covers (see figure 3).
Reverse the procedure to install.
Begin by accessing the back of the unit. Next remove
the screws that secure the cover (see figure 4).
Reverse the procedure to install.
-5-
V. REMOVAL & REPLACEMENT OF PARTS (cont’d)
WARNING: UNPLUG UNIT BEFORE SERVICING
27” Models
V. c - THERMOSTAT:
NOTE: The thermostat bulb for the refrigerator is embedded in the coil, top center location.
Begin by removing the evaporator cover as outlined
in section “V a.” Next, remove the screws that secure
the thermostat and then disconnect the lead wires from
the thermostat (see figure 5).
48” & 60” Models
NOTE: The thermostat bulb for the refrigerator is above
the evaporator coil, front area location, access from
the left side of the evaporator coil, behind the door
mullion.
Begin by removing the evaporator cover as outlined
in section “V a.” Next, remove the screws that secure
the thermostat and then remove the lead wire from the
thermostat (see figure 6).
Remove the thermostat bulb from its location (see figure 7).
Reverse the procedure to install.
Remove the thermostat bulb from the mounting clips
on the evaporator coil (see figure 8).
Reverse the procedure to install.
-6--17-
V. REMOVAL & REPLACEMENT OF PARTS (cont’d)
WARNING: UNPLUG UNIT BEFORE SERVICING
V. d - DOOR GASKET:
Begin by removing the old gasket by pulling it out from
the gasket retainer.
Begin installing the new gasket by installing the four
corners first, pushing straight into the gasket until it
is hooked behind the gasket retainer (see figure 9).
Next, starting at the center of one edge, push the door
gasket straight in until it is hooked behind the gasket
retainer (see figure 10).
Proceeding from this point out to the corners, continue to push the gasket straight into the gasket retainer.
Continue to the remaining edges and repeat the preceding operations until installation is completed.
Plug in the unit and put back into operation.
CAUTION:
will stretch it and, at room temperature, the material
will NOT return to its original length.
V. e - DOOR:
Begin by removing the old door. Open it to the maximum position, placing support under the non-hinged
end of the door so minimum movement occurs when
bolts from the lower hinge are removed (see figure 11).
Remove the bolts from the lower hinge plate and proceed to remove the door from the top hinge bracket.
The hinge plate pin and plastic bushing will remain in
the top hinge plate.
To install, position the lower hinge plate into the position of being open 90 degrees to the cabinet. Place
the top hinge plate pin in the hole in the top of the
door and support the other end of the door for minimal movement.
Start the bolts in the lower hinge plate and tighten the
bolts enough to hold the door in place. Remove the
support from under the end of the door.
Do Not Pull on the gasket material. This
Adjust the door as outlined in “section VI. h.”
V. f - DOOR HINGE MECHANISM:
Begin by removing the door as outlined above. Lay
the door flat on a padded surface to prevent damage.
Remove the screw that holds the lower hinge plate to
the hinge mechanism stem.
NOTE: When installing, make sure the hinge mechanism stem is in a position where there is tension on
the stem when turned in either direction.
-7- -16-
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