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 [phone], 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-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

V. f - DOOR HINGE MECHANISM (cont’d):
Remove the door spring and two plastic bushings (see
figure 12).

Remove the screws from the hinge mechanism and
remove it from the door (see figure 13).

Insert the replacement hinge mechanism into the door.
Use the hinge plate to turn hinge mechanism past the
point of being spring loaded. This will allow the stem
to be inserted into the square hole in the hinge plate.

A. For LH Hinge, Turn Clockwise.

B. For RH Hinge, Turn Counter-Clockwise.

Install the plastic bushing, the spring and the second
plastic bushing on the hinge mechanism stem. At­tach the hinge plate to the hinge mechanism.

NOTE: The lock washer is critical and must be installed.

Install the door as outlined in section “V. e . ”

ILLUS.
NO. NAME OF PART

1 Mach. Screw 10-32 x
2 Hinge Plate (Lower RH,Upper LH)
3 Self-Tapping Screw
4 Pin-Upper Hinge Pivot
5 Hinge Spacer
6 Bushing - Door Stop (Short)
7 Door Handle (Does Not Include Tape)
8 Door Gasket

9 Plug Button
10 Self-Tapping Screw 8-18 x
11 Square Plug
12 Hinge-Power Cartridge Assy.

(Incls. Spring, Washers & Retaining Screw)
13 Spacer-Hinge
14 Self-Tapping Screw
15 Plate-Hinge (Lower LH,Upper RH)
16 Self-Tapping Screw 10-24 x
17 Door Assembly. (Right Hand)
18 Door Assembly. (Left Hand)
19 Tape For Door Handle
20 Traulsen Nameplate with adhesive

3

⁄8 Truss Hd

1

⁄4-20 x 5⁄8 Hex Washer Hd., Type TT

3

⁄8 Phil Pan Hd., Type B

1

⁄4-20 x 5⁄8 Hex Washer Hd., Type TT

1

⁄2 Phil Truss Hd., Type D

-8-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

27” Models

V. g - DEFROST TIMER:

Begin by removing the evaporator cover as outlined
in section “V a.” Next, remove the screws that secure
the defrost timer to the evaporator housing. Discon­nect the lead wires from the defrost timer (see figure

14).

Reverse the procedure to install. Adjust the defrost
timer as outlined in “DEFROST TIMER SETTINGS” in
the “Service Procedures & Adjustments” section.

V. h -HEATERS:

Begin by removing the evaporator and condensing unit
covers as outlined in section “V a & b.” Next, discon-
nect the lead wires to the defrost heater. There is a
ground wire attached from the heater shield to the side
panel of the evaporator housing (see figure 16).

48” & 60” Models

Begin by removing the evaporator cover as outlined
in section “V a.” Next, remove the screws that secure
the defrost timer to its mounting bracket. Disconnect
the lead wires from the defrost timer (see figure 15).

Reverse the procedure to install. Adjust the defrost
timer as outlined in “DEFROST TIMER SETTINGS” in
the “Service Procedures & Adjustments” section.

Defrost Heater - Freezer Models Only: Begin by remov­ing the evaporator cover as outlined in section “V a.”
Next, disconnect the lead wires to the defrost heater
and drain pan heater. There is a ground wire attached
from the heater shield to the side panel of the evapo­rator housing (see figure 17).

Disconnect the drain tube from the drain pan at the
back of the unit and pull the drain pan and heater from
the unit.

Reverse the procedure to install.

Disconnect the drain tube from the drain pan at the
back of the unit and remove evaporator defrost heater
(see figure 18).

Reverse the procedure to install.

-9-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

V. i - DOOR FRAME HEATER:
Begin by opening the door past 90 degrees. Next re­move the door frame heater covers from the door frame
by gently prying out on the inside edge of the cover.

NOTE: Do not bend the covers. They will be difficult
to install.

Pull the door frame heater wire loose from the door
frame channel (see figure 19).

Disconnect the supply lead wires from each end of
the heater, and the (green) ground lead wire from one
end.

Connect lead wires to replacement heater and insert
the new heater into the door frame channel.

NOTE: Do not kink heater wire at the corners of the
frame.

NOTE: Check position of the heater cover in the top
corners of the door frame.

Install the horizontal heater covers first, then the ver­tical ones, using the following method.

a) Hook the inside edge of the heater cover over the
lip of the door frame.

b) Use your fingers to push the outside edge over the
outside lip of the heater channel in the door frame.

c) Repeat for each side.

Finish by checking for proper operation of both the
door and door frame heater.

-10-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

27” Models

V. j - CONDENSING UNIT COMPONENTS:
NOTE: Condensing components may vary on some systems, but the following procedures are general guidelines for
replacement of condensing unit components. Don’t damage any connected refrigeration or electrical lines and wires.

Begin by removing the condensing unit cover as out­lined in section “V b.” Next, remove the screws from
the condensing unit mounting plate and slide the con­densing unit from the unit for easier access (see fig­ure 20).

Reverse the procedure to install.

Begin by removing the condensing unit cover as out­lined in section “V b.” Next, remove the screws from
the condensing unit mounting plate and slide the con­densing unit from the unit for easier access (see fig­ure 21).

Reverse the procedure to install.

48” & 60” Models

V. k- EVAPORATOR FAN MOTOR:

Begin by removing the evaporator cover as outlined
in section “V a.” Next, pull the blade from the motor
shaft (see figure 22).

NOTE: To replace the fan blade only, reverse the pro­cedure to install.

Next, remove the bolts that secure the evaporator fan
motor mounting bracket. Then disconnect the lead
wires to the motor and remove the motor from the
mounting bracket.

Reverse the procedure to install.

Begin by removing the evaporator cover as outlined
in section “V a.” Next, remove the screws securing
the fan shroud from the evaporator coil. Disconnect
the lead wires to the motor and slide out the evapora­tor fan shroud. Pull the blade from the motor shaft
(see figure 23).

NOTE: To replace the fan blade only, reverse the pro­cedure to install.

Next, remove the bolts that secure the evaporator fan
motor mounting bracket. Remove the motor from the
mounting bracket.

Reverse the procedure to install.

-11-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

27” Models

V. l -

CONDENSER COIL:

WARNING: 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.

Begin by recovering refrigerant from the system.
NOTE: The use of reclaiming equipment is mandatory.

Next remove the condenser fan and shroud assembly
from the coil. Disconnect inlet and outlet lines at the
soldered connections nearest the condenser coil(see
figure 24).

48” & 60” Models

WARNING: 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.

Begin by recovering refrigerant from the system.
NOTE: The use of reclaiming equipment is mandatory.

Next remove the condenser fan and shroud assembly
from the coil. Disconnect inlet and outlet lines at the
soldered connections nearest the condenser coil(see
figure 25).

Remove the coil. Reverse the procedure to install coil,
then proceed to the next step.

NOTE: It is recommended that the filter/drier be
changed when this part is replaced.

Evacuate system. To finish, charge the system and
put unit back into operation.

Remove the coil. Reverse the procedure to install coil,
then proceed to the next step.

NOTE: It is recommended that the filter/drier be
changed when this part is replaced.

Evacuate system. To finish, charge the system and
put unit back into operation.

-12-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

27” Models

V. m -

WARNING: 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.

Begin by recovering refrigerant from the system.
NOTE: The use of reclaiming equipment is mandatory.

Next disconnect the lead wires to the compressor junc­tion box. Disconnect the suction and discharge lines
from the compressor (see figure 26).

48” & 60” Models

COMPRESSOR:

WARNING: 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.

Begin by recovering refrigerant from the system.
NOTE: The use of reclaiming equipment is mandatory.

Next disconnect the lead wires to the compressor junc­tion box. Disconnect the suction and discharge lines
from the compressor (see figure 27).

Remove the compressor. Install new compressor and
connect wire leads and conduit at compressor junc­tion box.

Remove the filter/drier and install a new filter/drier.

Evacuate system. To finish, charge the system and
put unit back into operation.

NOTE: Note the position of the compressors vibration
reduction grommets and washers, for reassembly with
new compressor.

Remove the compressor. Install new compressor and
connect wire leads and conduit at compressor junc­tion box.

Remove the filter/drier and install a new filter/drier.

Evacuate system. To finish, charge the system and
put unit back into operation.

-13-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

27” Models

V. n- CONDENSER FAN ASSEMBLY:

Begin by removing the screws that secure the fan
mounting bracket and remove it from the condensing
unit shroud (see figure 28).

48” & 60” Models

Begin by disconnecting the lead wires from the motor
(see figure 29).

Next, remove the screws that secure the fan mounting
bracket. Pull the blade from the motor shaft then re­move the fan motor from the mounting bracket.

Pull the blade from the motor shaft.

NOTE: To replace the fan blade only, reverse the pro­cedure to install.

Next, disconnect the lead wires from the motor and
remove the fan motor from the mounting bracket.

Reverse the procedure to install.

Reverse the procedure to install.

-14-

V. REMOVAL & REPLACEMENT OF PARTS (cont’d)

WARNING: UNPLUG UNIT BEFORE SERVICING

27” Models

V. o- EVAPORATOR COIL:

WARNING: 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.

Begin by removing the evaporator and condensing unit
covers as outlined in sections “V. a & b”.

Next, recover the refrigerant from the system.
NOTE: The use of reclaiming equipment is mandatory.

Remove the evaporator fan assembly and shroud.
Move the thermostat bulb out of the way (on freezer
models only, it will also be necessary to remove the
high limit thermostat and clips that support the de­frost heater and locate the thermostat bulb).

Remove the screws from the mounting brackets that
secure the coil (see figure 30).

48” & 60” Models

WARNING: 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.

Begin by removing the evaporator and condensing unit
covers as outlined in sections “V. a & b”. Also re­move the evaporator fan shroud as outlined in sec­tion “V. k”.

Next, recover the refrigerant from the system.
NOTE: The use of reclaiming equipment is mandatory.

Remove the thermostat as outlined in section “V. c”
(on freezer models only, it will also be necessary to
remove the high limit thermostat and screws that sup­port the defrost heater ).

Disconnect the wiring harness from condensing unit
to the evaporator.

Disconnect the refrigeration lines to the evaporator coil
at the back of the unit. Pull the coil from the cabinet.

NOTE: You may have to remove the defrost heater with
the evaporator coil.

Reverse the procedure to install.

Evacuate system. To finish, charge the system and
put unit back into operation.

NOTE: It is recommended that the filter/drier be
changed when this part is replaced.

Disconnect the refrigeration lines and wiring harness
to the evaporator coil at the back of the unit.

Remove the screws from the mounting brackets that
secure the coil (see figure 31). Pull the coil from the
cabinet.

NOTE: You may have to remove the defrost heater with
the evaporator coil.

Reverse the procedure to install. Evacuate system.

NOTE: it is recommended that the filter/drier be
changed when this part is replaced.

To finish, charge the system and put unit back into
operation.

-15-

VI. SERVICE PROCEDURES & ADJUSTMENTS

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL 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 TO TEST.

VI. 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.

VI. b - BOLT-ON PIERCING VALVES:
CAUTION: Bolt-on piercing valves are used as a tem­porary diagnostic tool. They must be removed from
the system before the system is put back into opera­tion.

1) Place one piercing valve on the compressor pro­cess tube and one on the liquid line drier process tube.
Follow the installation instructions provided by the
manufacturer of the piercing valve.

2) Upon completion of diagnosis, pinch off the pro­cess tube just below the piercing valve.

3) Remove the valve and sweat the opening shut.

4) Install permanent access fittings in the suction and
liquid lines as part of system repair.

5) When complete, follow the guidelines as outlined
under “LEAK CHECK” and “EVACUATING SYSTEM.”

VI. c - SWEAT-ON PIERCING VALVES:
NOTE: Sweat-on piercing valves are used for system
diagnostics, but may be left on after service is com­plete. They may be installed while the system is fully
charged.

VI. d - REFRIGERANT LEAK CHECK (cont’d):

1) Access the refrigeration system (note: see section
“VI. a - SYSTEM ACCESS”).

2) Attach gauge manifold set to the system, low side
to process tube on the compressor and the high side
to the process tube on the drier.

3) Connect refrigerant bottle to the center of gauge
manifold and open the valve on the bottle. Bleed charg­ing 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 of the gauge manifold and the valve
on the refrigerant bottle.

6) Disconnect refrigerant bottle and connect nitrogen
bottle.

NOTE: The use of a nitrogen requlator 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 “VI. e - EVACUATING SYSTEM”.

1) Place one piercing valve on the compressor pro­cess tube and one on the liquid line drier process tube.
Follow the installation instructions provided by the
manufacturer of the piercing valve.

2) When complete, follow the guidelines as outlined
under “LEAK CHECK” and “EVACUATING SYSTEM.”

VI. d - 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 REFRIG­ERANTS. BE CERTAIN THE WORK AREA IS WELL
VENTILATED. 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 recom­mended as a trace gas for leak detection.

11) Charge the system and check for proper opera­tion.

VI. e - 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 moisture 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
WARNING - 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.

VI. SERVICE PROCEDURES & ADJUSTMENTS (cont’d)

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL 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 TO TEST.

VI. e - EVACUATING SYSTEM/GUIDELINES (cont’d):

• Blow down of system with DRY NITROGEN prior to

evacuation is acceptable and many times desirable.
See”System Clean-Up.”

• Evacuate to 200 microns.

PROCEDURE
WARNING: 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.

WARNING: 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.

1) Access the refrigeration system as outlined under
“SYSTEM ACCESS.”

2) Connect low (blue) side of gauge manifold to
schrader valve on compressor process line and high
(red) side of gauge manifold to schrader valve on fil­ter/drier process line.

3) Connect center line of gauge manifold to vacuum
pump.

4) Turn vacuum pump on and open both sides of gauge
manifold.

5) Pull a vacuum to 200 microns.

6) Break the vacuum with 3 psig of dry nitrogen.

7) Repeat steps 5 and 6.

8) Pull vacuum to 200 microns.

9) Charge system and check for proper operation.

VI. f - CHARGING SYSTEM:
WARNING: 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.

WARNING: 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.

1) Access the refrigeration system.

2) Attach gauge manifold set to the system, low side
to process tube on the compressor and the high side
to the process tube on the drier.

NOTE: See “SYSTEM ACCESS.”

CHARGING SYSTEM (cont’d):

VI. f -

3) Be sure system is properly leak checked and evacu­ated before charging as outlined under “LEAK
CHECK” and “EVACUATING SYSTEM.”

4) Make certain both valves are closed on the gauge
manifold. Open the valve on the bottle. Bleed charg­ing hose at the manifold gauge to remove the air.

NOTE: Initially charge system through high side to
prevent liquid refrigerant from reaching compressor.

5) Open the high side gauge valve (red). Allow refrig­erant to flow into the system until the nameplate charge
is reached or until the high side will not accept any
more refrigerant. At this point, shut the gauge and
bottle valves.

6) Reconnect power to the unit and check for proper
operation and high pressure leaks.

7) Add the remaining amount of refrigeration charge
through the low side with the compressor running.

8) Check for proper operation and leaks.

9) Disconnect power to the unit and replace any cov­ers removed.

VI. g -

SYSTEM CLEAN UP/INTRODUCTION:
When a compressor burn-out or moisture infiltration
is encountered, the service person must make the
determination as to the degree of system contamina­tion. Normally a compressor burn-out will fit into one
of three catagories:

• CONTAINED - compressor oil not acidic, no oil dis

coloration.

• CONTAMINATED COMPRESSOR - oil acidic,

discoloration of oil, contamination limited to
compressor.

• MASSIVE CONTAMINATION - contaminated oil

and/or refrigerant pumped through system.

CONTAINED

1) Replacement of liquid line drier.

2) Install suction filter drier for clean up and then re­move it when service is complete. Usually within 48
hours.

3) Replacement of compressor.

4) Evacuation (to 200 microns).

5) Charge by weight.

CONTAMINATED COMPRESSOR
The “contaminated compressor”requires the same
procedure as the “contained” burn-out. Plus, the sys-
tem must be flushed with nitrogen after the compres­sor and drier has been removed.

VI. SERVICE PROCEDURES & ADJUSTMENTS (cont’d)

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL 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 TO TEST.

VI. g - SYSTEM CLEAN UP/INTRODUCTION (cont’d):

MASSIVE CONTAMINATION
The replacement compressor MUST NOT be installed
until after system clean-up procedures have been com­pleted.

1) Remove the burned-out compressor as outlined
under “COMPRESSOR” in “Section V. m”.

2) Remove the capillary tube and drier.

3) Purge nitrogen through the high and low sides of
system until moisture and contaminated oil has been
removed from the remaining components of the sys­tem.

4) Reassemble refrigeration system and add an CW052
style liquid drier and a suction line drier.

5) Purge nitrogen through the high and low sides of
system for 5 minutes.

6) Evacuate refrigeration as outlined under “EVACU-
ATING SYSTEM” for 30 minutes. Repeat nitrogen
purge and evacuation two more times.

7) Charge system as outlined under “CHARGING SYS­TEM”. Allow for the increased liquid capacity of the
liquid line drier.

8) Reconnect power and check for proper operation.

9) Disconnect power and install any panels removed.

10) Return between 24 and 48 hours to recover gas,
replace liquid line drier with a CW032 style drier. Re­move the suction drier, but do not replace.

11) Evacuate and charge system as outlined under
“EVACUATING SYSTEM” and “CHARGING SYSTEM”.

VI. i - REHINGING DOOR:
WARNING: UNPLUG UNIT BEFORE SERVICING.

1) Remove the door as outlined in “Section V. e.”

2) Remove the hinge plate pin and plastic bushing from
the top hinge plate.

3) Remove the top hinge plate from the cabinet and
set aside for use as the lower hinge plate.

4) Remove the plug button from the top of the door.

5) Lay the door face down on a padded flat surface.

6) Remove the screw that secures the bottom hinge
plate to the hinge mechanism and set aside for use as
the top hinge plate.

7) Remove the hinge mechanism, filler screws and
square plug from the bottom of the door.

8) Remove enough foam from the new location of the
hinge mechanism to allow for insertion of the hinge
mechanism without compressing the foam.

9) Install the hinge mechanism into the bottom of the
door where the square plug was removed and install
the plug and filler screws in the remaing locations.

VI. h - DOOR ADJUSTMENT:
WARNING: UNPLUG UNIT BEFORE SERVICING.

1) Open the door and loosen the hinge plate screws
enough to move the hinges if desired, but the door is
still held in place.

2) Center the door in the opening.

3) Level the top hinge plate and tighten the screws.

4) Level the lower hinge plate and tighten the screws.

10) Use the hinge plate to turn the hinge mechanism
past the point of being spring loaded. This will allow
the stem to be inserted into the square hole in the hinge
plate. For LH hinge, turn clockwise or for RH hinge,
turn counterclockwise.

11) Install the plastic bushing, the spring and the sec­ond plastic bushing on the hinge mechanism stem.
Attach the hinge plate to the hinge mechanism. NOTE:
The lockwasher is critical and must be installed.

12) Remove the plastic buttons (turn counterclockwise,
do not pull) from the hinge plate mounting positions
on the opposite side of the cabinet.

13) Install the top hinge plate to the cabinet.

14) Install the plug button and hinge plate pin in the
top of the door.

15) Install the door as outlined under “DOOR” in “RE-
MOVAL AND REPLACMENT OF PARTS.”

16) Adjust the door as outlined under “DOOR ADJUST­MENT.”

-18-

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL 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 TO TEST.

VI. i - REHINGING DOOR (cont’d):

13) Install the top hinge plate to the cabinet.

14) Install the plug button and hinge plate pin in the
top of the door.

15) Install the door as outlined in “Section V. e”.

16) Adjust the door as outlined under “DOOR ADJUST­MENT”.

VI. j -

DEFROST TIMER SETTING:

WARNING: UNPLUG UNIT BEFORE SERVICING

The timer is preset with four, 23 to 25 minute defrost
cycles per day. You can only set when the defrost cycle
will start.

1) Use a screwdriver to turn cam clockwise until you
hear the contacts close. This position is when the
defrost cycle begins.

NOTE: The screwdriver slot is designed to be turned
clockwise only.

2) Continue to turn the cam until you hear the con­tacts open. The defrost cycle has ended and it will be
six hours until the next occurrence.

3) You can continue turning the cam and position it
approximately within the six hour period.

DOOR PERIMETER HEATER TEST:

VI. k ­WARNING: UNPLUG UNIT BEFORE SERVICING

1) Access the heater wire around the door frame.

2) Plug the unit in and verify 120 volt supply to the
heater.

3) The reading should be .25 amp.

VI. l -

DEFROST HEATER TEST:

WARNING: UNPLUG UNIT BEFORE SERVICING

1) Access the heater lead wire to the defrost heater.

2) Plug the unit in, turn the defrost timer to start a de­frost cycle.

3) Verify 120 volt supply to the heater.

4) The reading should be 3.7 amp (27” models) or 2.8
amp (48” & 60” models).

5) If you want to perform a continuity check:

a. Unplug the unit.
b. Disconnect the lead wires to the heater.
c. Use an ohmmeter to check for 32.4 ohms (27”

models) or 41 ohms (48” & 60” models).

VI. m - DRAIN PAN HEATER TEST (n/a on 27” models):
WARNING: UNPLUG UNIT BEFORE SERVICING

1) Access the heater lead wire to the drain pan heater.

2) Plug the unit in, turn the defrost timer to start a de­frost cycle.

3) Verify 120 volt supply to the heater.

4) The reading should be 1.04 amp.

5) If you want to perform a continuity check:

a. Unplug the unit.
b. Disconnect the lead wires to the heater.
c. Use an ohmmeter to check for 110.0 ohms.

VII. a- COMPONENT FUNCTION:

VII. ELECTRICAL OPERATION

Compressor: Pumps refrigerant through refrigeration lines and components.
Condenser Fan: Draws air across condenser coil to aid in removing heat from the refrigerant and moves air across

Start Capacitor: Wired in series with the start windings to help start compressor motor.
Thermal Overload: Removes power from the compressor if the internal temperature of the compressor becomes too high (auto

Relay: Senses current of run winding of compressor motor. Normally open contacts close when the run winding

Evaporator Fan: Draws air from the cabinet and moves the air through the evaporator coil.
Defrost Heater: Defrosts evaporator coil and prevents water droplets from evaporator coil from freezing before they can drain

High Limit Thermostat: Monitors temperature at the evaporator. Opens circuit to defrost heater if coil

Defrost Time Clock: Controls defrost cycles on freezers. Four, 23 to 25 minute defrost per day. Start time can be set, but number

Door Perimeter Heater: Prevents condensate from forming on door frame.
Thermostat: Monitors cabinet air temperature. Opens when cabinet temperature reaches set temperature.
Drain Pan Heater: 48” and 60” models only. Defrosts drain pan to prevent water droplets from evapaorator coil from freezing

Hi-Limit Press. Control: 48” and 60” models only. Monitors compressor’s head pressure. Removes power from compressor and

compressor to aid in cooling the compressor.

reset).

draws a high amperage at start and brings the start capacitor and start windings into the circuit. As the motor
reaches operating speed (less amperage through run winding), the normally open contacts open and
removes the start capacitor and start windings from the circuit.

into the condensate pan. Operates only during defrost cycle.

temperature reaches 40°F (± 5°). Closes at 20°F (± 5°).

of defrosts is permanent.

before they can drain out. Operates only during defrost cycle.

condenser fan motor, if head pressure becomes too high (manual reset for high pressure trip).

-19-

VII. ELECTRICAL OPERATION (cont’d)

VII. b -

REFRIGERATION
1 - Conditions:

2- Temperature Rises Above Set Temperature:

3-

VII. c - COMPONENT LOCATION:

SEQUENCE OF OPERATION:

a. Unit connected to correct voltage.
b. Condensing unit controlled by thermostat.
c. Thermostat set to desired temperature.
d. Evaporator fan powered.
e. Cabinet temperature below set point.
f. High limit thermostat closed (freezer).
g. Power to thermostat contacts through defrost

timer 1/4 (freezer).
h. Door perimeter heater energized (freezer).
i. Defrost timer motor energized (freezer).

a. Thermostat contact close, powering compressor.

Set Temperature Is Met:
a. Unit returns to conditions in step 1.

27” Models

VII. b -

DEFROST MODE (freezer)
1 - Unit Operating In Refrigeration Mode.

2 - Defrost Intiated By Defrost Timer.

3 - Defrost Time Expires.

4 - Unit Returns To Normal Operation Until The Next

SEQUENCE OF OPERATION (cont’d):

a. Defrost timer contacts 1/4 open.

1) Power removed from evaporator fan.

2) Power removed from thermostat contacts.

b. Defrost timer contacts 1/2 close.

1) Power to defrost heater.

a. Defrost timer contacts 1/2 open.

1) Power removed from defrost heater.

b. Defrost timer contacts 1/4 close.

1) Power to evaporator fan.

2) Power to thermostat.

Defrost Cycle.

48” & 60” Models

-20-

VIII. WIRING DIAGRAMS - 27” MODELS

Electrical Diagram - Refrigerator Cabinet With Digital Thermometer Option

Models: UHT27, UPT276 & UPT276, 120VAC/60HZ/1PH

Electrical Diagram - Freezer Cabinet With Digital Thermometer Option

Model: ULT27, 120VAC/60HZ/1PH

-21-

VIII. WIRING DIAGRAMS - 48” & 60” MODELS

Electrical Diagram - Refrigerator Cabinets

Models: UHT48, UHT60, UPT488, UPT4812, UPT4818, UPT6012, UPT6018 & UPT6024, 120VAC/60HZ/1PH

Electrical Diagram - Freezer Cabinets

Model: ULT48 & ULT60, 120VAC/60HZ/1PH

-22-

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 CAU­TION 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.

Compressor will not run, current draw and trips overload. 1. Low voltage.

Defrost time too long. 1. Defrost timer malfunction.

Compressor short cycles on overload. 1. Low voltage.

Compressor short cycles on thermostat. 1. Improper air flow over evaporator coil.

Continuous unit operation. 1. Loss of refrigerant.

Compressor run time lengthy. 1. Partial loss of refrigerant.

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.

2. Start component malfunction.

3. Compressor windings shorted.

4. Locked rotor.

5. Excessive head pressure.

2. Improper air flow over condenser.

3. Low refrigerant charge.

4. Compressor electrical component malfunction.

5. High head pressure.

2. Low ambient conditions.

3. Thermostat bulb improperly located.

4. Thermostat malfunction.

2. Excessive door openings.

3. Thermostat malfunction.

4. Compressor inoperative.

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.

High head pressure. 1. Improper air flow across condenser.

Will not defrost. 1. Defrost heater malfunction.

Coil icing. 1. Gasket leaking.

Traulsen

4401 Blue Mound Road Fort Worth, TX 76106
Phone: [phone] Fax-Svce: [phone]
Website: www.traulsen.com

Quality Refrigeration

HOURS OF OPERATION:

Monday thru Friday 7:30 am - 4:30 pm CST

2. Loss of refrigerant.

3. Poor air flow.

2. Extreme ambient conditions.

3. Overcharge of refrigerant.

4. Air in system.

2. High limit thermostat open.

3. Defrost timer inoperative.

4. Wired wrong or faulty connection.

2. Drain tube plugged.

3. Non-frozen product in freezer.