Hoshizaki CRES49, CPT93, CPT67, CRES60, CRES36 User Manual

Hoshizaki

Hoshizaki America, Inc.

Commercial Series
Refrigerated Kitchen Equipment

Models
Refrigerated Prep Table with Raised Rail

“A Superior Degree

of Reliability”

www.hoshizaki.com

Refrigerated Equipment Stand

SERVICE MANUAL

Number: 73206
Issued: 6-2-2015
Revised: 12-1-2015

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]

HOSHIZAKI AMERICA, INC.
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

1. CPT .......................................................................................................................... 8

2. CRES ....................................................................................................................... 9

B. Refrigeration Circuit Diagram ...................................................................................... 10

II. Sequence of Operation and Service Diagnosis ................................................................11

A. Sequence of Operation Flow Chart ..............................................................................11

B. Service Diagnosis ....................................................................................................... 12

C. Thermistor Check ........................................................................................................ 16

D. Diagnostic Table .......................................................................................................... 17

III. Controls and Adjustments .............................................................................................. 19

A. Control Module ............................................................................................................ 19

B. Temperature ................................................................................................................ 21

1. Default Temperature Settings ................................................................................. 21

2. Temperature Setpoint ............................................................................................ 21

3. Changing the Temperature Display Scale (°F or °C) ............................................. 21

C. Manual Defrost ............................................................................................................ 21

D. Alarm Safeties ............................................................................................................. 22

E. Safety Devices ............................................................................................................ 22

IV. Refrigeration Circuit and Component Service Information.............................................. 23

A. Refrigeration Circuit Service Information .................................................................... 23

1. Refrigerant Recovery ............................................................................................. 23

2. Brazing .................................................................................................................. 24

3. Evacuation and Recharge (R-134a) ...................................................................... 24

B. Component Service Information .................................................................................. 25

C. CPT Door Reversal ..................................................................................................... 26

V. Maintenance .................................................................................................................... 29

VI. Preparing the Appliance for Periods of Non-Use ............................................................ 30

VII. Disposal ......................................................................................................................... 31

VIII. Technical Information .................................................................................................... 32

A. Electrical and Refrigerant Data ................................................................................... 32

B. Wiring Diagrams .......................................................................................................... 33

1. CPT46(-D), CPT67(-D), CPT93(-D) ....................................................................... 33

2. CRES36, CRES49, CRES72, CRES85, CRES98 ................................................. 34

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.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

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 service 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.

• The appliance must be installed in accordance with applicable national, state, and
local codes and regulations. Failure to meet these code requirements could result
in death, electric shock, serious injury, re, or damage to the appliance.

• Appliance is heavy. Use care when lifting or positioning. Work in pairs when
needed to prevent injury or damage. Do not lift using the refrigeration area, 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
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 plug and do not use an adapter
plug. Failure to follow these instructions may result in death, electric shock, or re.

to reduce the risk of potential shock

• The GREEN ground wire in the factory-installed 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 use an extension cord.

4

WARNING, continued

• 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.

• 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.

• 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. 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 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.

• 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.

• 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.

• 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.

5

WARNING, continued

CPT Models

• 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 150 lb. (68 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 entire rail must always be covered by rail dividers and pans. Otherwise, the
appliance will not cool properly. Use only pans up to 6" (15 cm) deep. Do not use
damaged rail dividers or 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.

• 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.

• For CPT46(-D) models, the anti-tip bracket must be properly installed and adjusted.
Otherwise, the unit may tip resulting in injury or damage.

CRES Models

• A minimum of 4" (11 cm) clearance is required between the bottom of the cooking
equipment heating element and the appliance top. When setting up cooking
equipment, follow the cooking equipment manufacturer's setup procedure.
Temperature at the appliance top must not exceed 180°F (82°C). For optimum
performance, installation of a heat shield (supplied by others) is recommended.

• For cooking equipment on the cabinet, do not exceed the total maximum weight
listed for your model.

Total Maximum Weight for Cooking Equipment on the Cabinet

CRES36 CRES49 CRES72 CRES85 CRES98

700 lb. (318 kg) 700 lb. (318 kg) 1,200 lb. (544 kg) 1,200 lb. (544 kg) 1,500 lb. (680 kg)

• 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.

• All casters on the appliance are lockable. After positioning the appliance in its nal
location, lock all casters.

• Before servicing or cleaning the appliance, disconnect any cooking equipment on
the appliance top and allow to cool.

6

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. 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.

• 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.

• Do not leave the doors/drawers open.

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

Additional Notice for CPT Models

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

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

• Do not place anything on the air duct panels beneath the pans in the rail. The air
duct panels are not load-bearing.

7

I. Construction and Refrigeration Circuit Diagram

A. Construction

1. CPT

Rail Cover

Start Relay and
Start Capacitor

Front Panel

Left Side Panel

Pans

Rail Dividers

Air Duct Panel

Compressor

Model Shown: CPT46

Model Shown: CPT67

Air Duct Panels

Control
Module

Air Duct Panels

CPT46 Series CPT67 Series CPT93 Series

8

2. CRES

Start Relay and
Start Capacitor

Control Module

Compressor

Front Panel

Model Shown: CRES49

Right Side Panel

9

B. Refrigeration Circuit Diagram

1. CPT and CRES Models

Evaporator Fans
(quantity depends on model)

Defrost Safety
Thermostat

Defrost Heater

Evaporator

Capillary Tube

Condenser Fan(s)
(quantity depends
on model)

Compressor

Condenser

High-Pressure Switch
(CPT67(-D), CPT93(-D)),

and All CRES Models)

Drier

10

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

DTh warms to 41°F (5°C)

1-min. Comp/CPT EvapFM

delay timer starts

11-min. temperature display

5. Defrost Termination

delay timer starts

Comp energized

ConFM energized

CRES EvapFM energized

CPT EvapFM energized (DTh≤36°F(2°C))

DH de-energized

CPT and CRES Sequence Flow Chart

4. Defrost Initiation

2. Cool Down Achieved

DTh is at or below

39°F (3.8°C) and

CTh warms

CTh cools

to 3°F (1.7°C)

3. Cool Down Restart

DTh in control

6-hr. defrost interval timer

terminates

to 3°F (1.7°C)

above setpoint

below setpoint.

*See Table.

CTh in control

2-min. Comp off

timer starts

2-min. Comp on

timer starts

DH energized

EvapFM continues

Comp de-energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

Note:

*CPT: Factory Default Setpoint 32°F (0°C)

*CRES: Factory Default Setpoint 35°F (2°C)

ConFM de-energized

Legend:

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

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

Comp-compressor

ConFM-condenser fan motor

c) 5-min. minimum defrost time.

d) 1-hr. maximum defrost time.

e) "dEF" displayed during defrost.

CTh-cabinet thermistor

DH-defrost heater

DTh-defrost thermistor

EvapFM-evaporator fan motor

1. Startup/Cool Down

Slight

Delay at

Startup

Startup

11

Comp energized

ConFM energized

EvapFM energized

B. Service Diagnosis

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.

• 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.

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

• CRES: WARNING! A minimum of 4" (11 cm) clearance is required between the

bottom of the cooking equipment heating element and the appliance top.

• CRES: WARNING! Temperature at the appliance top must not exceed 180°F
(82°C). For optimum performance, installation of a heat shield (supplied by
others) is recommended.

• WARNING! For cooking equipment on the cabinet, do not exceed the total
maximum weight listed for your model.

Total Maximum Weight for Cooking Equipment on the Cabinet

CRES36 CRES49 CRES72 CRES85 CRES98

700 lb. (318 kg) 700 lb. (318 kg) 1,200 lb. (544 kg) 1,200 lb. (544 kg) 1,500 lb. (680 kg)

NOTICE

• The appliance is not intended for outdoor use.

• The appliance must not be located in a corrosive environment.

• Normal operating ambient temperature must be within:
CPT 45°F to 86°F (7°C to 30°C)
CRES 45°F to 100°F (7°C to 37.8°C)

• The appliance must not be located next to ovens, grills, or other high heat
producing equipment.

• The appliance must be a minimum of 1" (3 cm) from side walls.

• The factory-installed rear bumpers must be in place to ensure proper rear
clearance.

• CPT: A minimum of 10" (25 cm) clearance above the rail must be provided to allow
the rail cover to open.

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. If the display is in alarm, see "III.D. Alarm Safeties."

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

establish a good neutral connection.

CPT Factory Default Temperature Settings:

a) Setpoint: 32°F (0°C).
b) Display Scale: °F.

12

CRES Factory Default Temperature Settings:

a) Setpoint: 35°F (2°C).
b) Display Scale: °F.

For further details, see "III. Controls and Adjustments."

There is a minimum 2-min. Comp on time and 2-min. Comp off time.

Note:

1) Unplug the appliance from the electrical outlet.

2) Remove the front panel.

3) Plug the appliance back into the electrical outlet.

4) Conrm 115VAC at CM L2 (BK or BR) to neutral (W).

5) Startup/Cool Down–There is a slight delay, cabinet temperature appears on display
and Comp and EvapFM icons turn on. Comp, ConFM, and EvapFM energize.

a) CM Diagnosis: Cabinet temperature appears on display. If not, check for 115VACat

CM L2 (BK or BR) to CM N3 neutral (W). If 115VAC is not present, check power
cord connections and breaker/fuse. Conrm wiring connections are secure for both
CML2 (BK or BR) (power supply) and CMN3(W) (neutral). If 115VAC is present
and display is off, replace CM.

b) Comp/ConFM Diagnosis: Conrm Comp and ConFM energize. Ifnot, check

for 115VAC at CM C1 (BR or BK) to neutral(W). If 115VAC is not present at
CMC1(BRor BK) to neutral (W), check CTh status. See "II.C. Thermistor Check."
If CTh ohm reading is in proper range, replace CM. If 115VAC is present at CM C1
(BR or BK) to neutral(W), check continuity of HPS (if applicable). If open, allow time
for HPS to reset. If HPS does not reset, see "d) HPS Activation" below. If ConFM
is energized but Comp is not, check for 115VAC from both sides of Comp external
protector to neutral (W). If 115VAC is present on one side and not the other, allow
time for Comp external protector to cool and reset. If Comp external protector does
not reset, replace Comp external protector. If115VAC is present on both Comp
external protector wires, check Comp start capacitor, start relay, and Comp motor
windings. If ConFM is not energized, check ConFM fan blades for binding and motor
winding continuity.

If Comp and ConFM are energized and the cabinet does not cool down, check for a
restriction in the refrigeration circuit and correct refrigerant charge.

c) EvapFMDiagnosis:

1. CPT: Conrm EvapFM energizes. If not, check for 115VAC at CMF5(DBU) to
neutral (W). If 115VAC is not present, replace CM. If 115VAC is present, check
EvapFM blades for binding and EvapFM continuity.

2. CRES: Conrm EvapFM energizes when Comp energizes. If not, check for 115VAC

at CM C1 (BR) to neutral(W). If 115VAC is not present, replace CM.
If115VAC is present, check for a loose wire, EvapFM blades binding, and
EvapFM continuity.

d) HPS Activation: Conrm ConFM is energized and fan blade turns freely.

Conrmcondenser coil is not clogged or restricted. Conrm there are no restrictions
in the refrigeration circuit (drier). Let refrigeration circuit pressures equalize. IfHPS
does not reset and pressures are equalized, replace HPS. Ifpressures are not
equalized, reclaim refrigerant and diagnose refrigeration circuit restriction.

13

6) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM continues.
Comp and ConFM de-energize. Diagnosis: Conrm Comp and ConFM de-energize.
Ifnot, and Comp and ConFM were energized longer than 2 min., check CTh status.
See"II.C. Thermistor Check." If CTh ohm reading is in range and Comp and ConFM
were energized longer than 2 min., check for 115VAC at CM C1 (BR or BK) to
neutral(W). If115VAC is present, replace CM.

7) Defrost– 6-hr. defrost timer terminates and DTh is at or lower than39°F(3.8°C),
defrost starts. If on, Comp and EvapFM icons turn off. Comp, ConFM, and EvapFM
de-energize. The defrost icon turns on and "dEF" is displayed. DHenergizes. There
is a 5-min. minimum defrost time, 1-hr. maximum defrost time, 6-hr. minimum defrost
interval, and 8-hr. maximum defrost interval.

1a) Time-Initiation: 6-hr. defrost interval timer terminates. Control module checks DTh.

IfDTh is at or lower than 39°F (3.8°C), defrost starts. Ifon, Comp and EvapFM
icons turn off. Comp, ConFM, and EvapFM de-energize. Defrosticon turns on and
"dEF"is displayed. DHenergizes. IfDTh is greater than 39°F (3.8°C), defrost is
delayed for 2 hrs. (8-hr. defrost interval timer). Once the 8-hr. defrost interval timer
terminates, defrost starts regardless of evaporator temperature.

1b) Manual-Initiation: To initiate a manual defrost, press and release the manual defrost

button on display. If on, Comp and EvapFM icons turn off. Comp, ConFM, and
EvapFM de-energize. Defrost icon turns on and "dEF" is displayed. DHenergizes.

2) Defrost-Termination:
(1) DTh warms to 41°F (5°C). DH de-energizes. 1-min. Comp/EvapFM delay timer

and 11-min. temperature display delay timer start. Defrost icon and "dEF" display
continue.

(2) 1-min. Comp/EvapFM delay timer terminates. Defrost icon turns off. Comp icon

turns on. Comp and ConFM energize. EvapFM on CRES energizes. If DTh is
at 36°F(2°C) or lower, EvapFM icon turns on and EvapFM on CPT energizes.
"dEF" display continues. 6-hr. defrost interval timer resets.
Note: If DTh is 37°F (3°C) or higher when 1-min. Comp/EvapFM delay timer
terminates, CPT EvapFM remains off until evaporator temperature is 36°F(2°C)
or lower.

(3) 11-min. temperature display delay timer terminates. Cabinet temperature replaces

"dEF."

Defrost Diagnosis:

1) Time-Initiation: Has 6-hr. defrost timer terminated? Before proceeding, conrm DTh

status. See "II.C. Thermistor Check." Manual-Initiation: Press and release the
defrost button.

Check the following:

(1) CM Diagnosis: Conrm defrost icon turns on, Comp and EvapFM icons turn off,

and "dEF" replaces cabinet temperature on display. If not, replaceCM.

(2) DH Diagnosis: Conrm DH energizes. If not, check for 115VAC at CM H4 (R) to

neutral (W). If 115VAC is not present, replace CM. If115VAC is present, check
DST continuity. If open, let cool and reset. If DST does not close, replace DST.
IfDST is closed, check DH amp draw and continuity.

14

(3) Comp/ConFM/CRES EvapFM Diagnosis: Conrm Comp, ConFM, and EvapFM

de-energize. If not, check for 115VAC at CM C1 (BR or BK) to neutral(W).
If115VAC is present, replace CM.

(4) CPT EvapFM Diagnosis: Conrm EvapFM de-energizes. If not, check for

115VAC at CM F5 (DBU) to neutral (W). If 115VAC is present, replace CM.

2) Defrost-Termination: There is a 5 min. minimum defrost time and a 1 hr. maximum
defrost time. Has 5-min. minimum defrost timer terminated? Conrm DTh status.
See "II.C. Thermistor Check."

(1) CM, DTh, and DH Diagnosis: If5-min. minimum defrost timer has terminated,

has DTh warmed to 41°F (5°C)? If DTh has not warmed to 41°F(5°C), check
DST and DH continuity. Next, check DH amp draw. If DTh is in proper range,
DHde-energizes. Ifnot, replace CM. Once DH de-energizes, 1-min. Comp/
EvapFM delay timer and 11-min. temperature display delay timer start. Defrost
icon and "dEF" display continue. If not, replace CM. If41°F(5°C) is not achieved
within 1 hr., CM terminates defrost.

(2) Comp/ConFM/CRES EvapFM Diagnosis: 1-min. Comp/EvapFM delay timer

terminates. Comp icon turns on and Comp, ConFM, and CRES EvapFM
energize. If not, conrm CTh is warm enough for Comp, ConFM, and CRES
EvapFM operation. Next, check for 115VAC at CM C1(BR or BK) to neutral(W).
If115VAC is not present, check CTh status. "II.C.Thermistor Check." If CTh
ohm reading is in proper range, and Comp, ConFM, and CRES EvapFM do not
energize, replace CM. If 115VAC is present at CM C1(BR or BK), check that
CRES EvapFM energize. If not, check for loose wiring, fan blades binding, and
CRES EvapFM winding continuity. Relace as needed. Next, check for closed
HPS. If closed, check Comp start components, Comp external protector, and
Comp motor winding continuity. If ConFM is not energized, check ConFM fan
blades for binding and motor winding continuity.

(3) CPT EvapFM Diagnosis: 1-min. Comp/EvapFM delay timer terminates. If DTh

is at 36°F(2°C) or lower, EvapFM icon turns on and CPT EvapFM energizes.
Ifnot, conrm that DTh is at 36°F(2°C) or lower. If not, conrm Comp is on and
cooling. See "II.B.5)b) Comp/ConFM Diagnosis" and "II.C. Thermistor Check."
Once 36°F(2°C) or lower is achieved, check for 115VAC at CMF5 (DBU) to
neutral (W). If 115VAC is not present, replace CM. If 115VAC is present, and
CPT EvapFM is not energized, check CPT EvapFM blades for binding and CPT
EvapFM winding continuity.

(4) 11-min. temperature display delay timer terminates: "dEF" is replaced by

cabinet temperature on display. If not, replace CM.

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

CTh–cabinet thermistor; DH–defrost heater; DST–defrost safety thermostat;
DTh–defrost thermistor; EvapFM–evaporator fan motors; HPS–high-pressure

switch

15

C. Thermistor Check

The cabinet thermistor is used for cabinet temperature control and the defrost thermistor
is used for defrost cycle initiation (39°F (3.8°C), defrost termination (41°F (5°C), and
EvapFM initiation after defrost (36°F(2°C) or lower). Thermistor resistance varies
depending on temperature. The control module monitors the thermistors to control
system operation.
No adjustment is required.

To check thermistor resistance, follow the steps below.

1) Unplug the appliance.

2) Remove the front panel.

3) Disconnect and remove the thermistor in question.

4) Immerse the thermistor sensor portion in a glass containing ice and water for 2 to 3 min.

5) Check the resistance between the wires at the thermistor connector. Normal reading is
within 16.0 to 16.7 kΩ. If outside the normal reading, replace the thermistor.

6) Reconnect and replace the thermistor in its correct position. See "IV.B. Component
Service Information."

7) Plug the appliance back in.

16

D. Diagnostic Table

Check for correct appliance installation per the instruction manual and proper voltage per
appliance nameplate.

1. Appliance Not Cooling

Appliance Not Cooling - Possible Cause

1. Power Supply

2. Power Cord and Plug

3. Wiring a) Loose connection or open.

4. Control Module
See "III.D. Alarm Safeties."

5. Compressor External Protector

6. Compressor a) Defective.

7. Condenser a) Dirty.

8. Evaporator Fan

9. Evaporator

10. Refrigerant/Refrigerant Lines a) Gas leak.

High-Pressure Switch

11.
CPT67(-D), CPT93(-D), and all
CRES Models

Defrost Heater

12.
Rail Air Duct Panels

13.
CPT Models

a) Unplugged, blown fuse, or tripped or defective circuit breaker.
b) Loose connection.

c) Not within specications.
a) Loose connection.
b) Defective.

b) Faulty.

In alarm or "- - -" shown on display module on models with

a)

remote display module.
Defective.

b)

a) Dirty condenser.
b) Condenser fan not operating.

c) Defective.
d) Start relay defective.
e) Low charge.

f) Start capacitor (if applicable) defective.

a) Defective.
b) Fan blade binding.
a) Dirty or frozen up. See "2. Evaporator is Frozen Up."

b) Refrigerant lines or components restricted.

Dirty condenser.

a)

Ambient temperature too warm.

b)

Condenser fan not operating.

c)

Refrigerant overcharge.

d)

Refrigerant lines or components restricted.

e)

Defective.

f)

Control module defective.

a)

Misaligned.

a)

Missing.

b)

17

2. Evaporator is Frozen Up

Evaporator is Frozen Up - Possible Cause

Evaporator

1.
Evaporator Fan Motor

2.

Defrost Thermistor

3.
Control Module

4.
Refrigerant Charge/Refrigerant

5.
Lines

Defrost Heater

6.

Defrost Timer

7.
Defrost Safety Thermostat

8.

Dirty.

a)

Defective.

a)
b) Fan blade binding.
c) Defrost thermistor defective.
d) Control module defective.

Out of position or defective.

a)

Defective.

a)

Low.

a)

Component restriction (cap tube, drier).

b)

Defective.

a)

Defective.

a)

Defective.

a)

3. Defrost Fails to Initiate or Terminate

Defrost Fails to Initiate - Possible Cause

Defrost Thermistor (Conrm

1.

DTh status. See "II.C.
Thermistor Check.")

Control Module

2.

Defrost Fails to Terminate - Possible Cause

Defrost Thermistor (Conrm

1.

DTh status. See "II.C.
Thermistor Check.")

Defrost Heater

2.

Control Module

3.

Evaporator temperature 39°F (3.8°C) or lower not achieved.

a)

See "1. Appliance Not Cooling."
Out of position or defective.

b)

Defective.

a)

Evaporator temperature 41°F (5°C) not achieved.

a)

Defective.

b)

Defrost safety thermostat defective.

a)

Defective.

b)

Defective.

a)

18

III. Controls and Adjustments

A. Control Module

When the power cord is plugged in there is a slight delay, then the current cabinet
temperature is displayed. From the control module, the cabinet setpoint and temperature
display scale can be changed.

All models are pretested and factory set

.

NOTICE

• The control module is fragile, handle very carefully.

• Do not change wiring and connections. Never misconnect terminals.

• Do not short out power supply to test for voltage.

1. Control Module Display Icons

Control Module Icons

Icon Meaning

Compressor, condenser fan motor, and CRES evaporator fan motor

Compressor running.

Defrost

Appliance is in defrost cycle. See "II.B. Service Diagnosis" for details.
Evaporator Fan Motor (CPT model only)

Evaporator fan motor is running. Evaporator fan motor de-energizes when appliance is in
defrost.

Alarm

Appliance is in alarm. See "III.D. Alarm Safeties" for details.

2. Control Module Display Layout

Control Module

Manual
Defrost
Button

Compressor Icon

ECO

SC

SC
Button

Defrost
Icon

Evaporator Fan
Motor Icon
(CPT model only)

°C
°F

Alarm
Icon

19

Up
Button

V

V

Down
Button

Fig. 1

Front
Panel

3. Control Module Rear Layout

Defrost Thermistor

Fig. 2

4. Control Module Electrical Layout

Cabinet Thermistor

(BU)

(BR)

Defrost Thermistor

(BR)

(BU)

Cabinet Thermistor

C1 Compressor, Condenser Fan Motor, and
CRES Evaporator Fan Motor (BR or BK)

L2 Power Supply (BR or BK)

N3 Neutral (W)

20

F5 CPT Evaporator Fan Motor (DBU)

H4 Defrost Heater (R)

B. Temperature

EHE

The default temperature scale is °F, but it can be changed to read °C. To change,
see "III.B.3. Changing the Temperature Display Scale (°F or °C)."

1. Default Temperature Settings

a) CPT Setpoint: 32°F (0°C).
b) CRES Setpoint: 35°F (2°C).
c) Temperature Display Scale: °F.

2. Temperature Setpoint

The temperature setpoint is the value for the average cabinet temperature. The
temperature differential for the compressor to turn on and off is ±3°F (±1.7°C) of the
temperature setpoint. For example, for a temperature setpoint of 32°F (0°C), the
compressor comes on at 35°F (2°C), and the compressor goes off at 29°F (-2°C).
If necessary, adjust the temperature setpoint as follows:

1) Press and hold the up button briey, then release. The current temperature setpoint
appears.

2) Press the up or down button until the desired value is displayed. After a few sec., the
display returns to the current cabinet temperature and the temperature setpoint is
saved.

• The temperature setpoint is adjustable between 28°F and 45°F (-2°Cand 7°C).
The factory default is 32°F (0°C) for CPT and 35°F (2°C) for CRES.

NOTICE! Do not adjust the temperature setpoint more than 2°F (1°C) at a time.
Allow the temperature to stabilize for a minimum of 8 hrs. before making further
temperature setpoint adjustments.

3. Changing the Temperature Display Scale (°F or °C)

To change the temperature display scale, follow the steps below.

1) Press and hold both the up and down buttons for 5 sec. "PAS" appears briey in the
display, then "000" appears.

2) Press the up button to change the display to "001".

3) Press the SC button. "
"diS" is displayed.

4) Press the SC button. "CFu" appears in the display. Press the SC button again. The
current temperature display scale setting appears.

5) Press the up or down button to change the temperature display scale.

6) Press the SC button to save the setting. Wait 1 min. or press the manual defrost button
twice to return to the temperature display.

" appears in the display. Press the up or down button until

C. Manual Defrost

To initiate a manual defrost, press and release the manual defrost button. The defrost
icon and "dEF" appear in the display.

21

D. Alarm Safeties

Alarm signals are designed to protect the appliance and food product. These alarms
give information or warnings in the event the appliance is operating out of acceptable
parameters. Should one of the alarms occur, follow the instructions in the table below
to address the alarm. The alarm code ashes once every second with audible alarm.
Tosilence the alarm, press and release the upper button.

Alarm Signals

Alarm Code Problem Corrective Action/Reset Details

E01

E02

Hi

Lo

UHi

ULo

Cabinet Thermistor Malfunction Alarm

Cabinet thermistor has failed.

Defrost Thermistor Malfunction Alarm

Defrost thermistor has failed.

High Temperature Alarm

Cabinet temperature has remained above
57°F (13.9°C) for more than 2hr.

Low Temperature Alarm

Cabinet temperature has remained below
20°F (-6.5°C) for more than 2hr.

High-Voltage Alarm (135VAC
more)

Low-Voltage Alarm (96VAC

±5% or

±5% or less)

Beeps for 10 sec., then silent for 50 sec. To silence
the alarm, press and release the up button.

Appliance cycles 5 min. on, 5 min. off.

Beeps for 10 sec., then silent for 50 sec. To silence
the alarm, press and release the up button.

Appliance cycles on and off with cabinet thermistor.

Beeps for 10 sec., then silent for 50 sec. To silence
the alarm and clear "Hi" from the display, press and
release the up button. The alarm icon stays on.

Automatically resets when temperature returns to
normal.

Beeps for 10 sec., then silent for 50 sec. To silence
the alarm and clear "Lo" from the display, press and
release the up button. The alarm icon stays on.

Automatically resets when temperature returns to
normal.

The compressor de-energizes if voltage protection
operates. The voltage safeties automatically reset
when voltage is corrected.

E. Safety Devices

1. Compressor External or Internal Protector

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 (CPT67(-D), CPT93(-D) and all CRES models)

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 both the compressor and condenser fan motor are off, it is most likely the appliance is
off or the high-pressure switch has opened. See "VIII.B. Wiring Diagrams."

22

IV. Refrigeration Circuit and Component Service Information

WARNING

• 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. For cleaning procedures, see the instruction manual.

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-134a 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 min. when replacing or servicing
parts. The Polyol Ester (POE) oils used in R-134a 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).

1. Refrigerant Recovery

No refrigerant access valves are provided on this appliance. Using proper refrigerant
practices, utilize a temporary tap-line valve on the high side to recover the refrigerant.
Store the refrigerant in an approved container. Do not discharge the refrigerant into the
atmosphere.
After recovery is complete, replace the tap-line valve with a proper, permanent access
valve.

23

2. Brazing

WARNING

• R-134a itself is not ammable at atmospheric pressure and temperatures up to
212°F (100°C).

• R-134a itself is not explosive or poisonous. However, when exposed to high
temperatures (open ames), R-134a can be decomposed to form hydrouoric
acid and carbonyl uoride both of which are hazardous.

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

• 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-134a as a mixture with
pressurized air for leak testing.

1) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 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).

2) 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-134a as a mixture with
pressurized air for leak testing.

3. Evacuation and Recharge (R-134a)

1) Attach a vacuum pump to the system. Be sure the high-side charging hose is connected
to the eld-installed high-side access valve.

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 high-side valve on the gauge manifold. 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. Evacuating period depends
on pump capacity.

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

24

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. See the nameplate for the required refrigerant charge. Hoshizaki recommends
only virgin refrigerant or reclaimed refrigerant which meets the requirements of ARI
Standard 700 (latest edition) be used.

6) A liquid charge is recommended when charging an R-134a system. 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, then close the refrigerant access valve
(if applicable). Disconnect the gauge manifold hose.

9) Cap the access valve to prevent a possible leak.

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.

25

C. CPT Door Reversal

This appliance is provided with a cabinet design which, after being delivered to the
installation location, permits changing of the door swing from left to right or right to left. To
change the door swing, follow the steps below. Example shows change from right hinged
to left hinged.

WARNING

• Wear eye protection when reversing the doors.

• Keep ngers away from edge of upper hinge bracket. Spring cartridge can cause
the upper hinge bracket to move suddenly with extreme force.

1) Make sure the appliance is unplugged from the electrical outlet and the casters are
locked.

2) Open the door to the fully open position, then remove the inner screw from the upper
hinge bracket. See Fig. 3.

3) Close the door. WARNING! Keep away from upper hinge bracket. Upper hinge
bracket kicks out when door is closed. See Fig. 4. Remove the outer screw from the
upper hinge bracket.

WARNING! Upper
hinge bracket
kicks out when
door is closed

Inner Screw
Upper Hinge Bracket

Outer Screw
Upper Hinge Bracket

Door Fully Open

Door Closed

Fig. 3

Fig. 4

4) While maintaining a hold on the door, remove the lower hinge bracket. See Fig. 5. Leave
the thrust-washer in place.

5) Pull out the bottom of the door slightly and gently remove the door from the appliance.

6) Remove the upper hinge bracket from the spring cartridge. See Fig. 6.

Fig. 5

Thrust-Washer

Lower Hinge Bracket

Bolts

Fig. 6

Screw

Washer

Upper Hinge Bracket

Door

26

7) Remove the ller cap, ller screws, and spring cartridge. See Fig. 7. Leave the
thrust-washers in place on the spring cartridge. NOTICE! Spring cartridge may be

difficult to remove. Be careful not to damage the nish.

Screws

Filler Cap

Filler Screws

Thrust-Washers

Fig. 7

Door

Spring Cartridge

8) Clear material from the spring cartridge hole to allow for spring cartridge installation.
Reinstall the ller cap, ller screws, and spring cartridge on the opposite side of the
door. See Fig. 8.

Screws

Spring Cartridge

Fig. 8

Spring Cartridge Hole

Filler Screws

Filler Cap

Door

27

9) Make sure the thrust-washers are in place on the spring cartridge, then install the upper
hinge bracket onto the spring cartridge. See Fig. 9. The upper hinge bracket should be
canted out towards the center as shown with the screw holes towards the back of the
appliance.

10) Remove the ller cap and nylon bearing from the bottom of the door. SeeFig.10.
Reinstall on the opposite side.

Screw

Washer

Screw Holes

Upper Hinge Bracket

Thrust-Washers

Door

Filler Cap

Fig. 9

Fig. 10

Nylon Bearing

11) Move the door into position and maintain a hold on the door. Make sure the
thrust-washer is in place, then install the lower hinge bracket. Do not tighten the bolts
yet. Start each bolt for a few threads only and leave loose. See Fig. 11.

12) Install the outer screw into the upper hinge bracket. Do not tighten the screw yet. Start
the screw for a few threads only and leave loose. See Fig. 12. Note: The door being
reversed must be in the closed position. However, the adjoining door may be opened for
ease of access.

Outer Screw
Upper Hinge Bracket

Thrust-Washer

Lower Hinge Bracket

Bolts

Fig. 11

Door Closed

Fig. 12

13) Open the door to the fully open position.

14) Rotate the upper hinge bracket inward into position using channel locks. See Fig.13.
NOTICE! Be careful not to damage the nish. Install the inner screw into the upper
hinge bracket.

15) Tighten all fasteners.

Rotate Inward

Rotate upper hinge bracket using
channel locks

Inner Screw

Fig. 13

Upper Hinge Bracket

Door Fully Open

28

V. Maintenance

The maintenance schedule below is a guideline. More frequent maintenance may be
required depending on the appliance's environment, and local sanitation regulations.

WARNING

• Unplug the appliance before performing maintenance to prevent electric shock or
injury by moving parts. To reduce the risk of electric shock, do not touch the plug
with damp hands.

• Before servicing: Move all foods into another clean refrigerator or freezer.

• CRES: Before performing maintenance, disconnect any cooking equipment on the
appliance top and allow to cool.

Maintenance Schedule

Frequency Area Task

Twice a Year CRES Condenser Inspect. Clean if necessary by using a brush or vacuum cleaner.

More frequent cleaning may be required depending on location.

Yearly CPT Condenser

Power Supply Connection

If the plug or power cord is damaged, contact your local Hoshizaki service representative
or local Hoshizaki distributor immediately and ask for repairs.

29

VI. Preparing the Appliance for Periods of Non-Use

When shutting down the appliance for more than one week, follow the instructions below.

WARNING

When preparing the appliance for long storage, prevent the doors/drawers from
closing to reduce the risk of children getting trapped.

NOTICE

When preparing the appliance for long storage, clean the appliance. See the
instruction manual for cleaning details.

1) Before shutting down the appliance, move all foods into another clean refrigerator or
freezer.

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

the plug with damp hands.

30

VII. Disposal

When disposing of the appliance, follow the instructions below.

WARNING

When preparing the appliance for disposal, remove the doors/drawers to reduce the
risk of children getting trapped. Leave the 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.

31

VIII. Technical Information

A. Electrical and Refrigerant Data

Design

Pressure

AC Supply

Model

CPT46(-D) 115/60/1 3.7 290 120 6.5
CPT67(-D), CPT93(-D) 115/60/1 5.5 290 120 11.6
CRES36 115/60/1 4.3 330 120 8.5
CRES49 115/60/1 3.7 330 120 8.5
CRES72 115/60/1 4.3 330 120 8.5
CRES85 115/60/1 4.3 330 120 8.5
CRES98 115/60/1 4.3 330 120 8.5

Voltage Amperes

(PSIG)

HIGH LOW 134a

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.

Refrigerant

(oz.)

32

B. Wiring Diagrams

1. CPT46(-D), CPT67(-D), CPT93(-D)

CPT67(-D) &

CPT93(-D)

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

**

CPT67(-D) &

CPT93(-D)

*

Yellow (Y) CPT67

Auxiliary Code D-5(B)

and Earlier

* High-Pressure Switch

Cut-out 300±10 PSIG

Cut-in 190±20 PSIG

** Defrost Thermostat

Cut-out

Cut-in

33

2. CRES36, CRES49, CRES72, CRES85, CRES98

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

**

** Defrost Safety Thermostat

EVAPORATOR FAN MOTOR

EVAPORATOR FAN MOTOR

(CRES49)

(CRES72, CRES85, CRES98)

Cut-in

Cut-out

34

*

* High-Pressure Switch

Cut-out 300±10 PSIG

Cut-in 190±20 PSIG