Hoshizaki WF27A01, SR36A15M, WR27AD2, UR27ALP, WR27A User Manual

Service Manual

Steelheart Series
Refrigerated Kitchen Equipment

Models
Undercounter
Worktop
Prep Table

hoshizakiamerica.com

Number: 73217
Issued: 11-2-2018

WARNING

Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage. Proper installation is the
responsibility of the installer. Product failure or property damage due to improper
installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the
service of the appliance.

Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.

Phone: [phone]
Fax: [phone]

E-mail: [e-mail]

618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

2

IMPORTANT

This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this booklet for any further reference that may be necessary.

CONTENTS

Important Safety Information ................................................................................................. 4

I. Construction and Refrigeration Circuit Diagram ................................................................. 8

A. Construction .................................................................................................................. 8

B. Refrigeration Circuit Diagram ........................................................................................ 9

II. Sequence of Operation and Service Diagnosis ............................................................... 10

A. Sequence of Operation Flow Chart ............................................................................. 10

1. Undercounter and Work Top: Refrigerator .............................................................. 10

2. Prep Table: Refrigerator ..........................................................................................11

3. Undercounter and Work Top: Freezer .................................................................... 12

B. Service Diagnosis ....................................................................................................... 13

C. Control Module Check ................................................................................................. 18

D. Diagnostic Table .......................................................................................................... 20

III. Controls and Adjustments ............................................................................................... 23

A. Temperature Settings .................................................................................................. 23

B. Defrost ......................................................................................................................... 23

C. Safety Devices ............................................................................................................ 25

D. Perimeter and Mullion Heaters .................................................................................... 25

IV. Refrigeration Circuit and Component Service Information.............................................. 26

A. Refrigeration Circuit Service Information .................................................................... 28

B. Component Service Information .................................................................................. 31

V. Preparing the Appliance for Periods of Non-Use ............................................................. 32

VI. Disposal .......................................................................................................................... 33

VII. Technical Information ..................................................................................................... 34

A. Electrical and Refrigerant Data ................................................................................... 34

B. Wiring Diagrams .......................................................................................................... 35

1. Undercounter and Worktop: Refrigerator ................................................................ 35

2. Prep Table .............................................................................................................. 36

3. Undercounter and Work Top: Freezer .................................................................... 37

3

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.

DANGER

WARNING

NOTICE

IMPORTANT

Indicates a hazardous situation that, if not avoided, will result in
death or serious injury.

Indicates a hazardous situation that, if not avoided, could result
in death or serious injury.

Indicates a situation that, if not avoided, could result in damage
to the appliance or property.

Indicates important information about the use and care of the
appliance.

DANGER

Risk of Fire or Explosion

Flammable Refrigerant Used

• Follow handling instructions carefully
in compliance with U.S. government
regulations.

• Do not use mechanical devices to defrost.

• Do not puncture refrigerant tubing. Risk
of re or explosion due to puncture
of refrigerant tubing; follow handling
instructions carefully.

• Component parts shall be replaced with
like components.

• Servicing shall be done by factory
authorized service personnel to minimize
the risk of possible ignition due to incorrect
parts or improper service.

• Consult instruction manual/ service
manual before attempting to install or
service this product. All safety precautions
must be followed.

• Dispose of properly in accordance with
federal or local regulations.

• Do not place any potential ignition sources
in or near the appliance.

Risque De Feu Ou D'Explosion

Le Frigorigène Est Inammable

• Suivre attentivement les instructions
de manipulation conformément à la
réglementation gouvernementale.

• Ne pas utiliser d'appareils mécaniques
pour dégivrer le réfrigérateur.

• Ne pas perforer la tubulure contenant le
frigorigène. Risque de feu ou d'explosion
si la tubulure contenant le frigorigène
est perforée; suivre les instructions de
manutention avec soin.

• Les pièces des composants doivent être
remplacées par des pièces et accessoires
équivalents.

• L’entretien doit être effectué par le
personnel de service autorisé par le
fabricant an de minimiser les risques
d’inammation attribuables à l’installation
d’une pièce inadéquate ou à la mauvaise
exécution du service.

• Consulter le manuel du propriétaire/
guide de réparation avant de tenter une
réparation. Toutes les mesures de sécurité
doivent être respectées.

• Éliminer conformément aux règlements
fédéraux ou locaux.

• Ne placez aucune source d’inammation
potentielle dans ou près de l’appareil.

4

WARNING

The appliance should be destined only to
the use for which it has been expressly
conceived. Any other use should be
considered improper and therefore
dangerous. The manufacturer cannot be
held responsible for injury or damage
resulting from improper, incorrect, and
unreasonable use. Failure to install,
operate, and maintain the appliance
in accordance with this manual will
adversely affect safety, performance,
component life, and warranty coverage.

To reduce the risk of death, electric
shock, serious injury, or re, follow
basic precautions including the
following:

• Only qualied service technicians should
install and service the appliance.

• Wear appropriate personal protective
equipment (PPE) when servicing the
appliance.

• The appliance must be installed in
accordance with applicable national, state,
and local codes and regulations.

• Appliance is heavy. Use care when lifting
or positioning. Work in pairs when needed
to prevent injury or damage. Do not lift
using the top section or the doors/drawers.

• To reduce the risk of electric shock, do not
touch the plug with damp hands.

• Unplug the appliance before servicing.

• The appliance requires an independent
power supply of proper capacity. See the
nameplate for electrical specications.
Failure to use an independent power
supply of proper capacity can result in a
tripped breaker, blown fuse, damage to
existing wiring, or component failure. This
could lead to heat generation or re.

• THE APPLIANCE MUST BE
GROUNDED. The appliance is equipped

with a NEMA5-15 three-prong grounding
plug
shock hazards. It must be plugged into a
properly grounded, independent 3-prong
wall outlet. If the outlet is a 2-prong outlet,
it is your personal responsibility to have
a qualied electrician replace it with a
properly grounded, independent 3-prong
wall outlet. Do not remove the ground
prong from the power cord and do not use
an adapter plug. Failure to follow these
instructions may result in death, electric
shock, or re.

• Do not use an extension cord.

• Do not use an appliance with a damaged
power cord. The power cord should not be
altered, jerked, bundled, weighed down,
pinched, or tangled. Such actions could
result in electric shock or re. To unplug
the appliance, be sure to pull the plug, not
the cord, and do not jerk the cord.

• The GREEN ground wire in the factory­installed power cord is connected to the
appliance. If it becomes necessary to
remove or replace the power cord, be
sure to connect the power cord's ground
wire.

• Do not splash, pour, or spray water
directly onto or into the appliance. This
might cause short circuit, electric shock,
corrosion, or failure.

• Do not make any alterations to the
appliance. Alterations could result in
electric shock, injury, re, or damage to
the appliance.

• The appliance is not intended for use by
persons (including children) with reduced
physical, sensory, or mental capabilities,
or lack of experience and knowledge,
unless they have been given supervision
or instruction concerning use of the
appliance by a person responsible for
their safety.

to reduce the risk of potential

5

WARNING, continued

• Children should be properly supervised
around the appliance.

• Do not climb, stand, or hang on the
appliance or doors/drawers or allow
children or animals to do so. Do not climb
into the appliance or allow children or
animals to do so. Death or serious injury
could occur or the appliance could be
damaged.

• Be careful not to pinch ngers when
opening and closing the doors/drawers
or rail cover (prep table models) or when
handling food pans. Be careful when
opening and closing the doors/drawers or
rail cover when children are in the area.

• Open and close the doors/drawers and
rail cover (prep table models) with care.
Opening the doors/drawers or rail cover
too quickly or forcefully may cause
injury or damage to the appliance or
surrounding equipment.

• Do not use combustible spray or place
volatile or ammable substances in or
near the appliance. They might catch re.

• Keep the area around the appliance clean.
Dirt, dust, or insects in the appliance
could cause harm to individuals or
damage to the equipment.

• Do not block air inlets or outlets, otherwise
cooling performance may be reduced.

• Do not tightly pack the cabinet. Allow some
space between items to ensure good air
ow. Also allow space between items and
interior surfaces.

• Do not put warm or hot foods in the cabinet.
Let them cool rst, or they will raise the
cabinet temperature and could deteriorate
other foods in the cabinet or overload the
appliance.

• Food storage and handling must comply with
applicable codes and regulations.

• All foods should be wrapped in plastic lm
or stored in sealed containers. Otherwise
foods may dry up, pass their smells onto
other foods, cause frost to develop, result in
poor appliance performance, or increase the
likelihood of cross-contamination. Certain
dressings and food ingredients, if not
stored in sealed containers, may accelerate
corrosion of the evaporator, resulting in
failure.

• Do not store items near air outlets.
Otherwise, items may freeze up and
crack or break causing a risk of injury or
contamination of other food.

• Do not throw anything onto the shelves
or load any single shelf with more than
120lb. (54.5 kg) of product. They might fall
off and cause injury.

• Do not load any single drawer with more
than 75 lb. (34 kg) of product. Depending
on the weight of product in the drawers,
secure the unit as necessary to prevent it
from overturning. Do not open more than
one drawer at a time.

• The appliance is designed only for
temporary storage of food. Employ
sanitary methods. Use for any other
purposes (for example, storage of
chemicals or medical supplies such
as vaccine and serum) could cause
deterioration of stored items.

6

WARNING, continued

Additional Warnings for Prep Table
Models

• The entire rail must always be covered
by rail dividers and pans (1/6 size, up
to 6"(15cm)deep). Otherwise, the
appliance will not cool properly.

• Use only 1/6 size pans up to 6"(15cm)
deep. Do not use damaged pans.

• Ingredients must be pre-chilled to 37°F
(3°C) or less before placing in rail.

• Keep the rail cover closed when not
actively preparing food.

NOTICE

• Protect the oor when moving the
appliance to prevent damage to the oor.

• Keep ventilation openings, in the
appliance enclosure or in the built-in
structure, clear of obstruction. Do not
place anything on top of the appliance in
an undercounter installation. There must
be at least 1.5" (4 cm) overhead clearance
for proper ventilation. The factory-installed
rear bumpers must be in place to ensure
proper rear clearance. Blockage of airow
could negatively affect performance and
damage the appliance.

• The rail is for keeping ingredients cool
while preparing food. If not actively
preparing food for a long period such
as overnight, seal pans with plastic
wrap in addition to closing the rail cover.
Depending on conditions, the cabinet
temperature setting may need to be
adjusted to prevent items from freezing.
Alternatively, seal ingredients and store
them in a refrigerator or freezer.

• Do not allow the appliance to bear any
outside weight.

• To prevent deformation or cracks, do not
spray insecticide onto the plastic parts or
let them come into contact with oil.

• To avoid damage to the gasket, use only
the door/drawer handle when opening
and closing.

• To avoid damage to the top seal, do not lift
the appliance by the top panel or remove
the top panel.

Additional Notice for Prep Table
Models

• Do not place anything on top of the rail
hood or rail cover and do not lift the
appliance by the rail hood or rail cover.
The rail hood and rail cover are not
designed to bear any outside weight.

7

I. Construction and Refrigeration Circuit Diagram

A. Construction

1. Undercounter, Worktop, Prep Table Common Parts

• Evaporator

• Evaporator Fan

• Evaporator Fan Shroud
Nameplate

Thermometer

Door

Rear Panel

Control Module
Cover

Cabinet Temperature Control Dial

Model Shown: UF60A

Control
Module

Compressor

Door Gasket

Condenser

Condenser Fan Motor

Model Shown: UF60A

8

B. Refrigeration Circuit Diagram

Condenser

High-Pressure Switch

Capillary Tube

Condenser Fan

Evaporator Fans
(1, 2, or 3 depending on model)

Drier

Compressor

Evaporator

Cabinet Thermostat Bulb

Prep Table and Freezer Models: Defrost Heater, Defrost Safety Thermostat, and Defrost Thermistor

9

II. Sequence of Operation and Service Diagnosis

The steps in the sequence are as outlined below.
See the table for default cabinet temperature control settings.

Model Default Cabinet Temperature

Approximate Default Temperature

Control Setting

Undercounter
Worktop

Between 4 and 5 Refrigerator: 34°F (1°C)

Freezer: -5°F (-21°C)

Prep Table Between 4 and 5 34°F (1°C)

A. Sequence of Operation Flow Chart

1. Undercounter and Work Top: Refrigerator

Refrigerator Sequence Flow Chart

1. Startup/Cool Down

CTh above setpoint

CTh in control

Power on
Red LED On
(5 sec. Delay)

*

2-min. Comp
on timer starts

Green LED Flashes
If Red LED ashes, check CTh

Comp energized
ConFM energized
EvapFM energized

2. Cool Down Achieved

CTh cools to setpoint

*

2-min. Comp
off timer starts

Green LED Flashes
If Red LED ashes, check CTh

Comp de-energized
ConFM de-energized
EvapFM de-energized

Off cycle defrost
between run cycles

CTh above

setpoint

Legend:
Comp-compressor
ConFM-condenser fan motor
CTh-cabinet thermistor
EvapFM-evaporator fan motor

Note: Delays

*

a) 2-min. minimum Comp on timer starts when Comp energizes.
b) 2-min. minimum Comp off timer starts when Comp de-energizes.

10

2. Prep Table: Refrigerator

5. Defrost Termination

Defrost Termination:

46°F (7.7°C) achieved or

45 min. backup defrost

timer terminated.

Evap. temp. below

50°F (10°C)

4. Defrost

6-hr. DT terminates

Defrost:

Time/Temp achieved.

DTh in control

setpoint
CTh above

Defrost

Evap. Temp.

Terminated

reaches 46°F (7.7°C)

DH de-energized

*

6-hr DT starts

After DOT Delay:

Comp energized

ConFM energized

After FDD

*

EvapFM energized

*

*

6-hr. DT terminates

5-min. min. DT starts

45-min. max. DT starts

DH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

*

2-min. Comp off

3. Cool Down Achieved

CTh cools to setpoint

timer starts

EvapFM energized

Comp de-energized

CTh in control

ConFM de-energized

Prep Table Top Sequence Flow Chart

*

*

2-min. Comp on

2. Cool Down

1. Startup

CTh above setpoint

Red LED Off

Green LED Flashes

timer starts

If Red LED Flashes,

check CTh or DTh

Comp energized

EvapFM energized

ConFM energized

EvapFM energized

a) 2-min. minimum Comp on timer starts when Comp energizes.

b) 2-min. minimum Comp off timer starts when Comp de-energizes.

c) 5-min. minimum defrost time.

d) 45-min. maximum defrost time.

e) DOT (drip off time) 1-min. Comp/ConFM delay timer starts when defrost termination temperature is met (drip off time (DOT)).

f) FDD (fan delay after defrost) EvapFM starts once 30-sec. EvapFM delay timer terminates or DTh reaches 40°F (4.4°C).

Note: Delays

g) If evaporator temperature raises above 50°F (10°C) during the cooling cycle, 6-hr. DT resets.

Power on

Red LED On

(5 sec. Delay)

11

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DH-defrost heater

DT-defrost timer

DTh-defrost thermistor

EvapFM-evaporator fan motor

3. Undercounter and Work Top: Freezer

Defrost

5. Defrost Termination

Defrost Termination:

50°F (°10C) achieved or

1 hr. backup defrost timer

terminated.

DH de-energized

DTh in control

Terminated

8-hr. DT starts

*

After DOT Delay:

Comp energized

ConFM energized

MH energized

PH energized

*

After FDD

EvapFM energized

Defrost Initiation:

3. Defrost

Time/Temp achieved.

CTh warms

above

setpoint

8-hr. DT terminates

Evap. temp. below 41°F (5°C)

8-hr. DT terminates

Evap. temp. below 41°F (5°C)

5-min. min. DT starts

60-min. max. DT starts

DH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

PH de-energized

MH de-energized

Freezer Sequence Flow Chart

2. Cool Down Achieved

Achieved

2-min. Comp off

timer starts

Comp de-energized

ConFM de-energized

EvapFM de-energized

MH de-energized

PH de-energized

Setpoint

*

CTh in control

a) 2-min. minimum Comp on timer starts when Comp energizes.

b) 2-min. minimum Comp off timer starts when Comp de-energizes.

c) 5-min. minimum defrost time.

d) 1-hr. maximum defrost time.

e) DOT (drip off time) 3-min. Comp/ConFM delay timer starts when defrost termination temperature is met (drip off time (DOT)).

f) FDD (fan delay after defrost) EvapFM starts once 7-min. EvapFM delay timer terminates or DTh reaches 25°F (-4°C).

1. Startup/Cool Down

Red LED off

Green LED Flashes

If Red LED ashes,

check CTh or DTh

6-hr. or 8-hr. DT starts

2-min. Comp on

timer starts

Note: Delays

Comp energized

Power on

Red LED On

(5 sec. Delay)

ConFM energized

EvapFM energized

MH energized

PH energized

12

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DH-defrost heater

DT-defrost timer

DTh-defrost thermistor

EvapFM-evaporator fan motor

MH-mullion heater

PH-perimeter heater

B. Service Diagnosis

DANGER

Risk of Fire or Explosion

Flammable Refrigerant Used

• Follow handling instructions carefully
in compliance with U.S. government
regulations.

• Do not use mechanical devices to defrost.

• Do not puncture refrigerant tubing. Risk
of re or explosion due to puncture
of refrigerant tubing; follow handling
instructions carefully.

• Component parts shall be replaced with
like components.

• Servicing shall be done by factory
authorized service personnel to minimize
the risk of possible ignition due to
incorrect parts or improper service.

• Consult instruction manual/service manual
before attempting to install or service this
product. All safety precautions must be
followed.

• Dispose of properly in accordance with
federal or local regulations.

• Do not place any potential ignition sources
in or near the appliance.

Risque De Feu Ou D'Explosion

Le Frigorigène Est Inammable

• Suivre attentivement les instructions
de manipulation conformément à la
réglementation gouvernementale.

• Ne pas utiliser d'appareils mécaniques
pour dégivrer le réfrigérateur.

• Ne pas perforer la tubulure contenant le
frigorigène. Risque de feu ou d'explosion
si la tubulure contenant le frigorigène
est perforée; suivre les instructions de
manutention avec soin.

• Les pièces des composants doivent être
remplacées par des pièces et accessoires
équivalents.

• L’entretien doit être effectué par le
personnel de service autorisé par le
fabricant an de minimiser les risques
d’inammation attribuables à l’installation
d’une pièce inadéquate ou à la mauvaise
exécution du service.

• Consulter le manuel du propriétaire/
guide de réparation avant de tenter une
réparation. Toutes les mesures de sécurité
doivent être respectées.

• Éliminer conformément aux règlements
fédéraux ou locaux.

• Ne placez aucune source d’inammation
potentielle dans ou près de l’appareil.

WARNING

• The appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.

• Wear appropriate personal protective equipment (PPE) when servicing the
appliance.

• Risk of electric shock. Use extreme caution and exercise safe electrical practices.

• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

• Appliance is heavy. Use care when lifting or positioning. Work in pairs when
needed to prevent injury or damage.

• Make sure all food zones are clean after the appliance is serviced.

13

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.

See the table for default cabinet temperature control settings.

Model Default Cabinet Temperature

Control Setting

Undercounter
Worktop

Prep Table Between 4 and 5 34°F (1°C)

Between 4 and 5 Refrigerator: 34°F (1°C)

Approximate Default Temperature

Freezer: -5°F (-21°C)

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.
Conrm that the appliance location meets factory requirements:

• This appliance is not intended for outdoor use. Normal operating ambient

temperature should be within 45°F to 86°F (7°C to 30°C).

• The appliance should not be located next to ovens, grills, or other high heat

producing equipment. Check CM using the steps in "II.C. Control Module Check."

Note: • When checking voltage (115VAC), always choose a neutral white (W) wire to

establish a good neutral connection.

• CM has high and low voltage protection. If off on either protection, no LED is

visible and all components are off.
High Voltage: 135VAC
Low Voltage: 90VAC

• Solid red LED for 5 sec. at startup.

• Flashing green LED: Normal operation.

• Flashing red LED: check cabinet thermistor and defrost thermistor (if applicable).

• CM has a 2 min. minimum on time and 2 min. minimum off time for Comp.

1) Unplug the appliance from the electrical outlet.

2) Remove the rear panel.

3) Plug the appliance back into the electrical outlet. If appliance was in defrost when power
supply was disconnected, defrost is terminated and normal cooling cycle begins when
power supply is reconnected.

4) Startup/Cool Down–There is a slight delay (solid red LED for 5 sec., then ashing
green LED). Temperature above setpoint at CTh and if applicable, conrm appliance is
not in a defrost cycle (PT and Freezers). Comp, CondFM, and EvapFM energize. 2-min.
Comp on timer starts.
Freezers: PH, and MH energize.

a) CTh Diagnosis: If CTh fails, a red LED ashes along with the green LED on the CM.

Conrm CTh is properly connected to CM. Check Ohm reading of CTh. Replace as
needed.

b) TD Diagnosis: Conrm TD is set between 4 and 5. Check Ohm reading of TD.

Replace as needed.

14

c) CM Diagnosis: Conrm green LED is ashing. If not, check for 115VAC between

CM 2 (L) black (BK) wire and CM 3 (N) neutral white (W) wire. If 115VAC is
not present, check power cord connections and breaker/fuse. Conrm wiring
connections are secure for both CM 2 (L) black (BK) (power supply) and CM 3 (N)
white (W) (neutral).
If 115VAC is present and green LED is not ashing, replace CM.

d) Comp/CondFM Diagnosis: Check that Comp and ConFM energize. If not, conrm

that the temperature is above setpoint. Next, check for 115VAC at CM 1 (C)
brown(BR) wire to neutral white (W) wire. If 115VAC is not present, replace CM.
If 115VAC is present, check HPS continuity (if applicable). See "f) HPS Activation"
below.
Comp: If 115VAC is present, check Comp external overload, start cap, start relay,
and Comp motor windings. Replace as needed.
CondFM: If 115VAC is present, check fan blade for binding, then check ConFM
motor windings.

e) EvapFM Diagnosis: Check that EvapFM(s) energize. If not, check for 115VAC at

CM 5 (F) dark blue (DBU) wire to neutral white (W) wire. If 115VAC is not present,
replace CM. If 115VAC is present, check fan blades for binding, then check EvapFM
motor windings.

f) HPS Activation: Check continuity of HPS. If open, allow time for system pressure

to equalize and HPS to reset. If HPS does not reset, replace HPS and diagnose
reason for HPS activation. Conrm ConFM is energized and fan blade turns freely.
Check that the condenser coil is not clogged or restricted. Check that there are no
restrictions in the refrigeration circuit (drier).

g) PH and MH Diagnosis (Freezer only): PH and MH follow Comp operation. When

Comp is energized, PH and MH are energized. If 115VAC is present, check amp
draw of PH and MH. If an amp reading is not present, check the continuity of PH
and MH. If defective, replace PH or MH.

If Comp, ConFM, and EvapFM are energized and the cabinet does not cool down,

check for a restriction in the refrigeration circuit, low refrigerant charge, or inefficient
Comp.

5) Cool Down Achieved–Temperature cools to setpoint. Comp and ConFM de-energize.
UC/WT Refrigerators and Freezers: EvapFM de-energizes.
Prep Table: EvapFM continues.
Diagnosis: If temperature setpoint achieved and Comp, ConFM, and EvapFM(except
PT models) does not de-energize, check CTh and TD continuity. If CTh or TD is
defective, replace. If CTh and TD are good and either the Comp, ConFM, and/or
EvapFM (except PT models) continue, or if EvapFM on PT models de-energizes,
replace CM.

15

6) Defrost–Manually initiated defrost, off cycle defrost, and time-initiated
temperature-terminated heated defrost.

1a) Manually-Initiated (All): Turn the TD all the way to the right. Wait 1 to 3 sec. then

back to original setting. Defrost initiated. If defrost does not initiate, wait 1 to 2 min.
and repeat process.

1b) Off Cycle-Initiated (UC/WT Refrigerators): Off cycle between cooling cycles.

CTh cools below TD setting. TD setting satised. Comp, CondFM, and EvapFM
de-energize.

1c) Temp/Time-Initiated (Heated) (Prep Table and All Freezers): 6-hr. Prep Table or

8-hr. Freezer DT terminates.

(1) Prep Tables: Comp and ConFM de-energizes, EvapFM continues. DH energizes.

5-min. minimum DT starts and 45-min. maximum DT starts.

(2) Freezers: Comp, ConFM, PH, MH, and EvapFM de-energize. DH energizes.

5-min. minimum DT starts and 1-hr maximum DT starts.

Note: When DTh is above 50°F (10°C) on Prep Tables or above 41°F (5°C) on

Freezers, defrost will not initiate and Prep Table 6-hr. DT and Freezer 8-hr.
DT resets and starts once DTh temperature cools below 50°F (10°C)on Prep
Tables or cools below 41°F (5°C) on Freezers.

2a) Manually-Terminated: Turn the TD all the way to the right. Wait 1 to 3 sec. then

back to original setting. Defrost terminated. If DH continues or Comp does not
energize, make several more attempts of manual termination.

2b) Off Cycle-Terminated: CTh warms above TD setting. Comp, CondFM, EvapFM

energize.

2c) Temperature or Time-Terminated: DTh achieves termination temperature or

backup DT terminates.

(1) Prep Tables: 46

°F (7.7°C) achieved or 45-min. backup DT terminates. DH

de-energizes. IfCTh calling for cooling, 1-min. Comp delay timer starts (drip time)
and 90-sec. EvapFM delay timer starts. 1-min. Comp delay timer terminates.
Comp and ConFM energize. 30 sec. later, 90-sec. EvapFM delay timer
terminates and EvapFM energizes.
Note: If DTh achieves 40°F before 90-sec. EvapFM delay timer terminates,
90-sec. EvapFM delay timer terminates and EvapFM energizes.

(2) Freezers: 50°F (10°C) achieved or 1-hr. DT terminates. DH de-energizes. If CTh

calling for cooling, 3-min. Comp delay timer starts (drip time) and 7-min. EvapFM
delay timer starts. 3-min. Comp delay timer terminates. Comp and ConFM
energize. 4min. later, 7-min. EvapFM delay timer terminates and EvapFM
energizes.
Note: If DTh achieves 25°F before 7-min. EvapFM delay timer terminates, 7-min.
EvapFM delay timer terminates and EvapFM energizes.

16

Defrost Diagnosis:

1) Manual-Initiation: TD rotated to max. position and back. Prep Table 6-hr. DT or
Freezer 8-hr. DT terminates. After rotating TD several times and defrost still not
activated, wait 1 to 2 min. and repeat process. Replace TD as needed.

(2) CM Diagnosis: Conrm DH energizes (if applicable) and Comp, ConFM, and

EvapFM (if applicable) de-energize. If not, replace CM.

(3) Comp and ConFM Diagnosis: Conrm Comp and ConFM de-energize. If not,

check for 115VAC at CM 1 (C) (BR) to neutral (W). If 115VAC is present, Check
DTh continuity. Replace as needed. If DTh conrmed, replace CM.

(4) EvapFM (if applicable): Conrm EvapFM de-energizes. If not, check for 115VAC

at CM 5 (F) (DBU) to neutral (W). If 115VAC is present, conrm Comp and
ConFM de-energized. Next, check DTh continuity. Replace as needed. If DTh
conrmed, replace CM.

2) Off Cycle Defrost: Off cycle defrost. Has CTh warmed above temperature setpoint?
Ifnot, conrm CTh continuity. Replace as needed. If CTh conrmed, replace CM.

3) Heated Defrost Diagnosis: Initiation; Conrm Comp is energized, then manually
initiate defrost. Rotate TD all the way to the right. Wait 1 to 5sec. then rotate back
to original setting. Defrost initiated.

a) Prep Table: Check that Comp and ConFM de-energize. DH energizes.

EvapFMcontinues.

b) Freezer: Check that Comp, ConFM, PH, MH, and EvapFM de-energize.

DHenergizes.

(1) TD: If Comp and ConFM continue, wait 1 to 2 min. and make several more

attempts of manual initiation. Ifmanual initiation fails, replace TD.
(2) CM: If TD conrmed and Comp and ConFM continue, replace CM.
(3) DH: If Comp and ConFM de-energize, check that DH energizes. Check for

115VAC at CM 4 (H) (R) to CM 3 (N) (W). If 115VAC is not present, replace CM.

If115VAC is present, and DH is not energized, check for 115VAC at DST black

(BK) wire to any neutral white (W) wire. If 115VAC is not present, DST is open.

Letcool and reset. If DST does not reset (close), replace DST. If 115VAC is

present, check continuity of DH. Replace as needed.

4) Heated Defrost Diagnosis: Termination;
a) Prep Table

(1) DTh: DTh warms to 46°F (7.7°C). DH de-energizes. Conrm continuity of DTh.
Replace as needed. If DTh is good and DH continues after DTh achieves 46°F
(7.7°C), replace CM.

b) Freezer

(1) DTh: DTh warms to 50°F. (10°C) DH de-energizes. Conrm continuity of DTh.
Replace as needed. If DTh is good and DH continues after DTh achieves 50°F
(10°C), replace CM.

Legend: Comp–compressor; ConFM–condenser fan motor; CM–control module;

CTh–cabinet thermistor; DH–defrostheater; DST–defrost safety thermostat;
DT–defrost timer; DTh–defrost thermistor; EvapFM–evaporator fan motor;
HPS–high-pressure switch; MH–mullion heater; PH–perimeterheater;

TD–temperature dial

17

C. Control Module Check

1. Control Module

Before replacing a CM that does not show a visible defect and that you suspect is bad,
conduct the following check procedure. This procedure will help you verify your diagnosis.
Always choose a neutral (W) to establish a good power supply and neutral connection to
CM: 115VAC at CM 2 (L) (BK)

2. Startup/Cool Down

At startup, CM displays a solid red LED for 5 sec. After 5 sec. CM turns red LED off and
begins ashing a green LED. This is normal operation. If a red LED ashes (fault code),
check CTh or DTh for continuity and good connection to CM.

1) Check all wiring connections.

2) Be sure the power supply is connected to the electrical outlet.

3) Conrm the CTh and DTh are properly connected (no red LED ashing). A Red LED
turns on for 5 sec. at startup. After 5 sec. the red LED turns off and a green LED starts
ashing. This is normal operation. If the red LED starts ashing, check CTh and DTh
continuity. Replace as needed.

4) Check that Comp, ConFM, and EvapFM energize (PH and MH on freezers). If not check
CTh status. If CTh ohm reading is in proper range,
Comp and ConFM and PH and MH (freezers); check for 115VAC at CM 1 (C) (BR)
to neutral white (W). If 115VAC is not present, replace CM. If 115VAC is present and
Comp energized and ConFM did not, check ConFM blades for binding and motor
winding continuity. If PH or MH (freezers) does not energize, check continuity, replace
as needed.
EvapFM; Check for 115VAC at CM 5 (F) (DBU) to neutral white (W). If 115VAC is not
present, replace CM. If115VAC is present, check EvapFM blades for binding and motor
winding continuity.

3. Defrost initiation

5) Manual Defrost Check: Turn the TD all the way to the right. Wait 1 to 3 sec. then back
to original setting. Defrost initiated. If Comp and ConFM continue, wait 1 to 2 min. and
repeat process of manual initiation. If Comp remains energized, replace CM.

6) Conrm Comp, ConFM, EvapFM (UC/WT refrigerator and freezer), PH and MH
(freezers) de-energize. If not, for Comp, ConFM and PH and MH (freezers), check for
115VAC at CM 1 (C) (BR) to neutral white (W) wire and for EvapFM (if applicable) CM
5 (F) (DBU) to neutral white wire (W). If 115VAC is present, replace CM. Note: EvapFM
continues on Prep Table models.

7) Heated Defrost: Conrm DH energizes. Check for 115VAC at CM 4 (H) (R) to neutral
white (W) wire. If 115VAC is not present, replace CM.

18

4. Defrost Termination

8) Check that all components restart after defrost termination.
a) UC/WT Refrigerator: CTh above setpoint. Cool cycle starts. Comp, ConFM, and

EvapFM energize.

b) Prep Table: DTh warms to 46°F (7.7°C). DH de-energizes. Conrm continuity of DTh.

Replace as needed. If DTh is good and DH continues after DTh achieves
46°F (7.7°C), replace CM.

c) UC/WT Freezer: DTh warms to 50°F (10°C). DH de-energizes. Conrm continuity of

DTh. Replace as needed. If DTh is good and DH continues after DTh achieves 50°F
(10°C), replace CM.

Legend: Comp–compressor; ConFM–condenser fan motor; CM–control module;

CTh–cabinet thermistor; DH–defrost heater; DTh–defrost thermistor;
EvapFM–evaporator fan motors, MH–mullion heater; PH–perimeter heater

19

D. Diagnostic Table

Before consulting the diagnostic tables, check the following:

• Check the cabinet temperature control setting. See the table for default cabinet
temperature control settings.

Model Default Cabinet Temperature

Control Setting

Undercounter
Worktop

Prep Table Between 4 and 5 34°F (1°C)

Between 4 and 5 Refrigerator: 34°F (1°C)

Approximate Default Temperature

Freezer: -5°F (-21°C)

• Make sure the doors are not left open or opened too often and that they are sealing
properly.

• On prep tables, pans and rail dividers must be in place. Otherwise, the rail will not cool
properly.

• Make sure product is not blocking airow and that the cabinet is not overloaded with
warm or hot product. Product should be allowed to cool before putting in the appliance.
On prep tables, only load ingredients that have been pre-chilled to 37°F (3°C) or less.

• Check for correct installation and proper voltage per appliance nameplate. This
appliance is not intended for outdoor use. Normal operating ambient temperature:
– Undercounter and Worktop 45°F to 100°F (7°C to 38°C)
– Prep Table 45°F to 86°F (7°C to 30°C)

• The appliance should not be located next to ovens, grills, or other high heat producing
equipment. A minimum of 1.5" (38 mm) overhead clearance is required for proper
ventilation.

20

1. Appliance Not Cooling

Appliance Not Cooling - Possible Cause

Power Supply

1.

Power Supply Cord and Plug

2.

Wiring

3.

Cabinet Thermostat or Cabinet

4.

Thermistor
Cabinet Temperature Dial

5.

Defrost Timer or Control Module

6.

(if applicable)

Evaporator Fan Motor

7.

Condenser Fan Motor

8.

Compressor External Protector

9.

Compressor

10.

Condenser

11.

Evaporator

12.

Refrigerant/Refrigerant Lines

13.

High-Pressure Switch

10.
(if applicable)

Thermostatic Expansion Valve

11.

(not adjustable)

Unplugged, blown fuse, or tripped or defective circuit breaker.

a)

Loose connection.

b)

Not within specications.

c)

Loose connection.

a)

Defective.

b)

Loose connection or open.

a)

Faulty.

b)

Loose, disconnected, or defective.

a)

Loose, disconnected, or defective.

a)

Defrost timer defective. If applicable.

a)

Control module in alarm (red LED ashing). If applicable.

b)

Control module defective. If applicable.

c)

Defective.

a)

Fan blade binding.

b)

Defective.

a)

Fan blade binding.

b)

Dirty condenser.

a)

Condenser fan motor not operating.

b)

Defective.

c)

Start relay defective.

d)

Low charge.

e)

Start capacitor (if applicable) defective.

f)

Defective.

a)

Dirty.

a)

Dirty or frozen up.

a)

Gas leak.

a)

Refrigerant lines or components restricted.

b)

Dirty condenser.

a)

Ambient temperature too warm.

b)

Condenser fan motor not operating.

c)

Refrigerant overcharge.

d)

Refrigerant lines or components restricted.

e)

Bad contacts.

f)

Defective.

a)

21

2. Evaporator is Frozen Up

Evaporator is Frozen Up - Possible Cause

Evaporator

1.

Evaporator Fan Motor

2.

Refrigerant Charge

3.

Defrost Heater (if applicable)

4.

Defrost Timer or Control Module

5.

(if applicable)
Defrost Safety Thermostat Open

6.

(if applicable)
Thermostatic Expansion Valve

7.

(not adjustable)

Dirty.

a)

Defective.

a)

Fan blade binding.

b)

Low.

a)

Defective.

a)

Defective.

a)

Defective.

a)

Defective.

a)

3. Defrost Fails to Initiate or Terminate

Defrost Fails to Initiate or Terminate - Possible Cause

Defrost Thermistor (if applicable)

1.

Defrost Timer or Control Module

2.

(if applicable)
Defrost Heater (if applicable)

3.

Defective.

a)

Defective.

a)

Defective

a)

22

III. Controls and Adjustments

A. Temperature Settings

1. Temperature Reading

A thermometer with both °F and °C scales is mounted in the cabinet. See Fig. 1.

2. Cabinet Temperature

The appliance features a cabinet temperature control dial (TD). The warmest setting
is 1and the coldest setting is 7. See the table for default cabinet temperature control
settings.

Model Default Cabinet Temperature

Control Setting

Undercounter
Worktop

Prep Table Between 4 and 5 34°F (1°C)

Between 4 and 5 Refrigerator: 34°F (1°C)

Approximate Default Temperature

Freezer: -5°F (-21°C)

Fig. 1

Warmer Colder

Cabinet Temperature
Control Dial

B. Defrost

There are 2 types of defrost: Off Cycle Defrost and Heated Defrost.

Manual Initiation (All Models): Turn the TD all the way to the right. Wait 3 sec. then

back to original setting. Defrost initiated.
Refrigerator Off Cycle Defrost Automatic Initiation: Compressor cycles off with
cabinet setpoint temperature achieved.
Heated Defrost Automatic Initiation: Temperature achieved and defrost timer
terminates.
Manual Termination: Turn the TD all the way to the right. Wait 3 sec. then back to
original setting. Defrost terminated.
Automatic Termination: Cabinet temperature above setpoint, or defrost thermistor
above termination temperature, or backup defrost timer terminates.

Thermometer

1. Undercounter and Worktop Refrigerators

Off-Cycle Defrost: Undercounter and worktop refrigerators defrost naturally between run
cycles.

23

2. Prep Table and Freezer

Temperature/Time-Initiated Defrost Cycle: Defrost cycle occurs once every 6hrs. for prep
tables or 8 hrs. for freezers when defrost initiation temperature achieved (50
Prep Tables or 41

°F (5°C) for the Freezers). Defrost cycle initiation and termination are

°F (10°C) for

controlled by the control module and defrost thermistor.
Prep Table Refrigerators: The defrost heater energizes, the evaporator fan motor

remains energized, and all other components de-energize during the defrost cycle.
There is an in-line defrost safety thermostat.

Freezers: The defrost heater energizes and all other components de-energize during the
defrost cycle. There is an in-line defrost safety thermostat.

Minimum Defrost Time is 5 min.
Maximum Defrost Time is 45 min. for Prep Tables and 1 hr. for Freezers.

To initiate a manual defrost cycle follow the steps below.

1) Rotate TD all the way to the right. Wait 1 to 5sec. then rotate back to original setting.
Defrost initiated. See Fig. 2.

2) Repeat step 1 to terminate defrost.

Fig. 2

24

C. Safety Devices

1. Compressor External or Internal Protector (All Models)

If combined temperature/amperage value is above the limit specied by the
compressor manufacturer, the compressor protector operates independently to turn
off the compressor. The compressor protector de-energizes the compressor until the
temperature/amperage value returns to an acceptable level.

2. High-Pressure Switch

If pressure on the high-side of the appliance exceeds Hoshizaki specications, the
high-pressure switch activates and interrupts the compressor circuit, de-energizing the
compressor until the pressure returns to an acceptable level.
If the condenser fan motor is operating and the compressor is off, it is most likely that the
compressor protector opened. If both the compressor and condenser fan motor are off, it
is most likely the appliance is off or the high-pressure switch has opened.

D. Perimeter and Mullion Heaters

Freezers are equipped with perimeter and mullion heaters. If condensation occurs,
check continuity of heaters.

25

IV. Refrigeration Circuit and Component Service Information

DANGER

Risk of Fire or Explosion Flammable Refrigerant Used

• Follow handling instructions carefully in compliance with U.S. government
regulations.

• Do not use mechanical devices to defrost.

• Do not puncture refrigerant tubing. Risk of re or explosion due to puncture of
refrigerant tubing; follow handling instructions carefully.

• Component parts shall be replaced with like components.

• Servicing shall be done by factory authorized service personnel to minimize the risk
of possible ignition due to incorrect parts or improper service.

• Consult instruction manual/service manual before attempting to install or service
this product.

• Dispose of properly in accordance with federal or local regulations.

• Do not place any potential ignition sources in or near the appliance.

Risque De Feu Ou D'Explosion Le Frigorigène Est Inammable

• Suivre attentivement les instructions de manipulation conformément à la
réglementation gouvernementale.

• Ne pas utiliser d'appareils mécaniques pour dégivrer le réfrigérateur.

• Ne pas perforer la tubulure contenant le frigorigène. Risque de feu ou d'explosion
si la tubulure contenant le frigorigène est perforée; suivre les instructions de
manutention avec soin.

• Les pièces des composants doivent être remplacées par des pièces et accessoires
équivalents.

• L’entretien doit être effectué par le personnel de service autorisé par le fabricant
an de minimiser les risques d’inammation attribuables à l’installation d’une pièce
inadéquate ou à la mauvaise exécution du service.

• Consulter le manuel du propriétaire/guide de réparation avant de tenter une
réparation. Toutes les mesures de sécurité doivent être respectées.

• Éliminer conformément aux règlements fédéraux ou locaux.

• Ne placez aucune source d’inammation potentielle dans ou près de l’appareil.

26

WARNING

• Wear appropriate personal protective equipment (PPE) when servicing the
appliance.

• Technician must utilize a combustible gas leak detector at all times.

• Notify everyone in the immediate area that you are working with ammable
refrigerant.

• Do not work on appliance in a conned space. Conrm area is well ventilated.

• Identify and eliminate all possible ignition points in a 10 ft. (3 m) area around service
area.

• Do not use mechanical devices to defrost.

• Use non-sparking tools.

• Class B dry chemical re extinguisher or equivalent must be available.

• Do not pressurize system above 200 PSIG during leak check procedure or prior to
evacuating refrigeration system.

• This appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.

• To reduce the risk of electric shock, do not touch the plug with damp hands.

• Unplug the appliance from the electrical outlet before servicing.

• Make sure all food zones in the appliance are clean after the appliance is
serviced.

27

A. Refrigeration Circuit Service Information

WARNING

• Repairs requiring the refrigeration circuit to be opened must be performed by
properly trained and EPA-certied service personnel.

• Use an electronic leak detector or soap bubbles to check for leaks. Add a trace
of refrigerant to the system (if using an electronic leak detector), and then raise
the pressure using nitrogen gas (140 PSIG). Do not use R-290 as a mixture with
pressurized air for leak testing.

NOTICE

• Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.

• Do not leave the system open for longer than 15 minutes when replacing or
servicing parts. The Polyol Ester (POE) oils used in R-290 appliances can absorb
moisture quickly. Therefore it is important to prevent moisture from entering the
system when replacing or servicing parts.

• Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant
ow.

• When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).

Refrigerant leaks must be repaired as soon as they are discovered. If not, refrigerant
charge should be recovered from the system until the leak can be repaired.
When repairing a leak:

• Repair the leak properly – Remove the refrigerant, examine the leak source, determine
the reason for the leak, and carry out the proper course of action.

• Before repairing the leak, ensure that the refrigerant has been recovered and the
system purged with nitrogen when brazing.

• Be sure to remove piercing valves attached to the system after repairs are made.

1. Refrigerant Recovery

Using proper refrigerant practices, place piercing valves toward the end (crimped area)
of the high and low-side process tubes, then recover the refrigerant into an approved
container or device.

28

2. Brazing

DANGER

Risk of Fire or Explosion Flammable Refrigerant Used

• Servicing shall be done by factory authorized service personnel to minimize the risk
of possible ignition due to incorrect parts or improper service.

Risque De Feu Ou D'Explosion Le Frigorigène Est Inammable

• L’entretien doit être effectué par le personnel de service autorisé par le fabricant
an de minimiser les risques d’inammation attribuables à l’installation d’une pièce
inadéquate ou à la mauvaise exécution du service.

WARNING

• Wear appropriate personal protective equipment (PPE) when servicing the
appliance.

• You must have a combustible gas leak detector in the immediate work area at all
times.

• You must have a Class B chemical re extinguisher available at all times.

• Notify all persons in the immediate area that you are working with a ammable
refrigerant.

• Do not use silver alloy or copper alloy containing arsenic.

• Be sure the area is clear of refrigerant vapor before brazing.

1) Braze/repair/replace damaged component or tting.

2) Purge with nitrogen gas for 2 min. Then braze all ttings while purging with nitrogen gas
owing at a pressure of 3 to 5 PSIG.

NOTICE

• Always install a new drier every time the sealed refrigeration system is opened.

• Do not replace the drier until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant
ow.

• When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).

3) Use soap bubbles to check for leaks. Raise the pressure using nitrogen gas (190 PSIG).
Do not use any refrigerant as a mixture with pressurized air for leak testing.

4) Once leak checking is complete, release the nitrogen gas from the system.

29

3. Evacuation

1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both
high and low-side refrigerant piercing valves.

IMPORTANT

The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils.

2) Turn on the vacuum pump, then open the gauge manifold valves. Never allow the oil in
the vacuum pump to ow backwards.

3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum (500 microns). Evacuating
period depends on pump capacity.

4) Close the low-side valve and high-side valve on the gauge manifold.

5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air
from the hose. For the required refrigerant charge, see the nameplate. Hoshizaki
recommends only virgin or reclaimed refrigerant which meets ARI Standard 700 (latest
edition) be used.

4. Recharge

6) R-290 can be charged in either the liquid or vapor state.
Liquid charge is preferred. Ifrefrigerant charging is done in the liquid state, place the
service cylinder on the scales; if the service cylinder is not equipped with a dip
tube, invert the service cylinder, then place it on the scales. Open the high-side
valve on the gauge manifold.

7) Allow the system to charge with liquid until the proper charge weight is met.

8) Close the high-side valve on the gauge manifold. If charging is complete, skip to step 10.

9) If necessary, add any remaining charge to the system through the low-side.

NOTICE!To prevent compressor damage, use a throttling valve or liquid
dispensing device to add the remaining liquid charge through the low-side
refrigerant access valve with the compressor running. Close the refrigerant

cylinder valve and let the low-side refrigerant equalize to the system, then close the
low-side manifold gauge. Move the power switch to the "OFF" position (if applicable) or
unplug the appliance from the electrical outlet.

10) Pinch off (crimp down) the process tubes just below the piercing valves.

11) Remove the piercing valves. Cut the process tubes to remove the piercing valve holes
then braze the process tubes closed. Note: Be sure there is no refrigerant leak before
brazing.

12) Use a combustible gas leak detector or soap bubbles to check for leaks again.

13) Place red sleeves over the process tubes.

14) Plug the appliance back into the electrical outlet.

30

B. Component Service Information

NOTICE

When replacing a component listed below, see the notes to help ensure proper
operation.

Component Notes
Compressor Install a new start relay and compressor external protector. WARNING! To reduce the

risk of electric shock, be sure to reconnect the compressor's ground wire.

Thermostatic
Expansion Valve

• Attach the thermostatic expansion valve bulb to the suction line in the same location as
the previous bulb.

• The bulb should be between the 10 and 2 o'clock positions on the tube.

• Secure the bulb with the clamp and holder.

31

V. Preparing the Appliance for Periods of Non-Use

When shutting down the appliance for periods of non-use, follow the instructions below.

WARNING

Prevent the doors from closing to reduce the risk of children getting trapped.

NOTICE

Clean the cabinet interior, door gaskets, and shelves.

1) Before shutting down the appliance, move the stored food into another refrigerator or
freezer.

2) Unplug the appliance. WARNING! To reduce the risk of electric shock, do not touch

the plug with damp hands.

32

VI. Disposal

DANGER

Risk of Fire or Explosion Flammable Refrigerant Used

• Follow handling instructions carefully in compliance with U.S. government
regulations.

• Do not puncture refrigerant tubing. Risk of re or explosion due to puncture of
refrigerant tubing; follow handling instructions carefully.

• Dispose of properly in accordance with federal or local regulations.

Risque De Feu Ou D'Explosion Le Frigorigène Est Inammable

• Suivre attentivement les instructions de manipulation conformément à la
réglementation gouvernementale.

• Ne pas perforer la tubulure contenant le frigorigène. Risque de feu ou d'explosion
si la tubulure contenant le frigorigène est perforée; suivre les instructions de
manutention avec soin.

• Éliminer conformément aux règlements fédéraux ou locaux.

WARNING

When preparing the appliance for disposal, remove the doors/drawers to reduce the
risk of children getting trapped. Leave any shelves in place so that children may not
easily climb inside.

The appliance contains refrigerant and must be disposed of in accordance with
applicable national, state, and local codes and regulations. Refrigerant must be
recovered by properly certied service personnel.

33

VII. Technical Information

A. Electrical and Refrigerant Data

Design

Pressure

AC Supply

Model (includes drawer models)

U/WR27A(-xxx)
UR27A-GLP01 2.9
U/WF27A(-xx)

UF27A-GLP01 2.0
SR27A-(xxxxx) 115/60/1 2.4 360 190 2.3
U/WR36A(-xx) 115/60/1 2.4 360 190 2.3

SR36A(-xxx) 115/60/1 2.7 360 190 2.1
U/WR48A(-01)
U/WR48A-D2(-D4) 2.8
UR48A-GLP01 115/60/1 2.7 360 190 2.6
U/WF48A(-xx)
U/WF48A-D4 3.0
SR48A-(xxxxx) 115/60/1 2.5 360 190 2.9
U/WR60A(-01)
U/WR60A(-Dx) 3.3
U/WF60A(-xx) 115/60/1 5.6 360 190 3.9
SR60A-(xxxxx) 115/60/1 5.9 360 190 3.1
U/WR72A(-01)
U/WR72A(-D6) 3.5
SR72A-(xxxxx) 115/60/1 6.3 360 190 3.4

Voltage Amperes

115/60/1

115/60/1

115/60/1

115/60/1 5.9 360 190

115/60/1

115/60/1

2.5

2.5

2.6

3.1

2.9

(PSIG) Refrigerant (oz.)

HIGH LOW R290

360 190 2.3

360 190 2.1UF27A-LP 2.3

360 190 3.0

360 190 2.8

360 190 3.9

3.2

See the nameplate for electrical and refrigeration specications. The nameplate is located
inside the cabinet.
We reserve the right to make changes in specications and design without prior notice.

Legend: U/WR–undercounter/worktop refrigerator;
SR–prep table;
U/WF–undercounter/worktop freezer

34

B. Wiring Diagrams

1. Undercounter and Worktop: Refrigerator

35

2. Prep Table

°F±5°F (49°C±3°C)

120

** Defrost Thermostat

Cut-Out

°F±5°F (21°C±3°C)

70

Cut-In

**

*

* High-Pressure Switch

Cut-Out 300±10 PSIG

Cut-In 190±20 PSIG

36

3. Undercounter and Work Top: Freezer

**

°F±5°F (49°C±3°C)

*

** Defrost Thermostat

°F±5°F (21°C±3°C)

70

120

Cut-Out

Cut-In

* High-Pressure Switch

Cut-Out 360±30 PSIG

Cut-In 249±10 PSIG

37