Hoshizaki SR27A-12M Manuel utilisateur

Marque: Hoshizaki

Modèle: SR27A-12M

Taper: Manuel utilisateur

Models

Undercounter

Worktop

Prep Table

Steelheart Series

Refrigerated Kitchen Equipment

Service Manual

Number: 73217

Issued: 11-2-2018

Revision: 11-18-2019

hoshizakiamerica.com

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: 1-800-233-1940; (770) 487-2331

Fax: 1-800-843-1056; (770) 487-3360

E-mail: techsuppor[email protected]

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.

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 ...................................................................................... 10

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

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

1. Undercounter and Work Top: Refrigerator ...............................................................11

2. Prep Table: Refrigerator ......................................................................................... 12

3. Undercounter and Work Top: Freezer .................................................................... 13

B. Service Diagnosis ....................................................................................................... 14

1. Refrigerator/Freezer/Prep Table ............................................................................. 15

C. Control Module Check ................................................................................................. 20

D. Thermistor Check ........................................................................................................ 22

E. Cabinet Temperature Control Dial (CTCD) .................................................................. 23

F. Diagnostic Table ........................................................................................................... 23

III. Controls and Adjustments ............................................................................................... 26

A. Temperature Settings .................................................................................................. 26

B. Defrost ......................................................................................................................... 26

C. Safety Devices ............................................................................................................ 28

D. Perimeter and Mullion Heaters .................................................................................... 28

IV. Refrigeration Circuit and Component Service Information.............................................. 29

A. Refrigeration Circuit Service Information .................................................................... 31

B. Component Service Information .................................................................................. 34

V. Preparing the Appliance for Periods of Non-Use ............................................................. 35

VI. Disposal .......................................................................................................................... 36

VII. Technical Information ..................................................................................................... 37

A. Electrical and Refrigerant Data ................................................................................... 37

B. Wiring Diagrams .......................................................................................................... 38

1. Undercounter and Worktop: Refrigerator ................................................................ 38

2. Prep Table .............................................................................................................. 39

3. Undercounter and Work Top: Freezer .................................................................... 40

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.

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

Indicates a hazardous situation that, if not avoided, will result in

death or serious injury.

WARNING

Indicates a hazardous situation that, if not avoided, could result

in death or serious injury.

NOTICE

Indicates a situation that, if not avoided, could result in damage

to the appliance or property.

IMPORTANT

Indicates important information about the use and care of 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 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 to reduce the risk of potential

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 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 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.

• 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.

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 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.

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.

• 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.

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.

• 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.

I. Construction and Refrigeration Circuit Diagram

A. Construction

1. Solid Door Models

Compressor

Condenser Fan Motor

Condenser

Rear Panel

Thermometer

Door

Door Gasket

Nameplate

• Evaporator

• Evaporator Fan

• Evaporator Fan Shroud

Cabinet Temperature Control Dial

Model Shown: UF60A

Control

Module

2. Glass Door Models

Compressor

Condenser Fan Motor

Condenser

Rear Panel

Thermometer

Door

Door Gasket

Nameplate

• Evaporator

• Evaporator Fan

• Evaporator Fan Shroud

Cabinet Temperature Control Dial

Model Shown: UR48A-GLP01

Channel

Control

Module

Model Shown: UR48A-GLP01

LED Driver

LED Lights

B. Refrigeration Circuit Diagram

Evaporator Fans

(1, 2, or 3 depending on model)

Evaporator

Compressor

Drier

Condenser Fan

Condenser

Prep Table and Freezer Models: Defrost Heater

Capillary Tube

High-Pressure Switch

Cabinet Thermistor

Prep Table and

Freezer Models:

Defrost Safety

Thermostat

Prep Table and

Freezer Models:

Defrost Thermistor

II. Sequence of Operation and Service Diagnosis

The steps in the sequence are as outlined below.

A. Sequence of Operation Flow Chart

1. Undercounter and Work Top: Refrigerator

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.

c) 20-min. defrost time.

d) If evaporator temperature raises above 41°F (10°C) during the cooling cycle, 4-hr. DT is skipped. 8-hr. DT becomes mandatory.

1. Startup/Cool Down

Comp energized

ConFM energized

EvapFM energized

4-hr. DT starts

8-hr. DT starts

Comp de-energized

ConFM de-energized

EvapFM de-energized

Refrigerator Sequence Flow Chart

2. Cool Down Achieved

4. Defrost

CTh above setpoint

CTh cools to setpoint

CTh above

setpoint

Defrost Termination:

43°F (6.1°C) achieved

or 20 min. defrost timer

terminated.

CTh in control

4-hr. or 8-hr DT terminates

20-min. DT starts

Comp de-energized

ConFM de-energized

EvapFM energized

Defrost:

Time/Temp achieved.

Power on

Red LED On

(5-sec. Delay)

2-min. Comp off

timer starts

Green LED Flashes. If Red LED Flashes, check CTh

2-min. Comp on

timer starts

Evap. Temp.

reaches 43°F (6.1°C) or

20-min. DT terminates

Comp energized

ConFM energized

EvapFM energized

CTh in control

5. Defrost Termination

4-hr. or 8-hr. DT

terminates

Evap. temp. at or

below 41°F (5°C)

Defrost

Terminated

3. Cool Down Restarts

2. Prep Table: Refrigerator

Prep Table Top Sequence Flow Chart

2. Cool Down Achieved

3. Cool Down Restarts

EvapFM energized

Comp de-energized

ConFM de-energized

4. Defrost

CTh above setpoint

CTh cools to setpoint

CTh above

setpoint

Defrost Termination:

46°F (7.7°C) achieved or

45 min. backup defrost

timer terminated.

CTh in control

1. Startup/Cool Down

Comp energized

ConFM energized

EvapFM energized

6-hr. DT starts

6-hr. DT terminates

5-min. minimum DT starts

45-min. maximum DT starts

DH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

Defrost:

Time/Temp achieved.

Power on

Red LED On

(5-sec. Delay)

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DH-defrost heater

DT-defrost timer

DTh-defrost 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.

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

2-min. Comp off

timer starts

2-min. Comp on

timer starts

Evap. Temp.

reaches 46°F (7.7°C)

DH de-energized

6-hr DT starts

After DOT Delay:

Comp energized

ConFM energized

EvapFM energized

DTh in control

5. Defrost Termination

6-hr. DT terminates

Evap. temp. at or

below 50°F (10°C)

Defrost

Terminated

Green LED Flashes. If Red LED Flashes, check CTh or DTh

3. Undercounter and Work Top: Freezer

Freezer Sequence Flow Chart

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

1. Startup/Cool Down

2. Cool Down Achieved

Comp energized

ConFM energized

EvapFM energized

MH energized

PH energized

8-hr. DT starts

CTh in control

4. Defrost

Comp de-energized

ConFM de-energized

EvapFM de-energized

MH de-energized

PH de-energized

5. Defrost Termination

DTh in control

2-min. Comp off

timer starts

2-min. Comp on

timer starts

Defrost Termination:

50°F (°10C) achieved or

1 hr. backup defrost timer

terminated.

8-hr. DT terminates

Evap. temp. below 41°F (5°C)

5-min. minimum DT starts

60-min. maximum DT starts

DH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

MH de-energized

PH de-energized

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.

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).

DH de-energized

8-hr. DT starts

After DOT Delay:

Comp energized

ConFM energized

MH energized

PH energized

After FDD

EvapFM energized

Defrost

Terminated

8-hr. DT terminates

Evap. temp. below 41°F (5°C)

Power on

Red LED On

(5 sec. Delay)

4-hr continuous compressor

run timer terminates

Green LED Flashes. If Red LED Flashes, check CTh or DTh

3. Cool Down Restarts

CTh above setpoint CTh cools to setpoint

CTh above

setpoint

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.

1. Refrigerator/Freezer/Prep Table

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 dial settings.

Model Default Cabinet Temperature

Control Dial Setting

Approximate Default Temperature

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)

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.

• Control module 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).

• Control module 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.

See "II.D. Thermistor Check." Replace as needed.

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

CTCD. See "II.E) Cabinet Temperature Control Dial (CTCD)."

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. Next, check

for 115VAC at CM 1 (C) brown(BR) wire to neutral white (W) wire. If 115VAC is not

present at CM 1 (C) (BR) to neutral (W), check CTh status. See "II.D. Thermistor

Check." If CTh ohm reading is in proper range, 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.

h) Glass Door Cabinet Light Diagnosis: LED(s) are activated by CLS. If CLS is

engaged and LED(s) fail to turn on, check for 115VAC at both CLS (Y) wires to a

neutral white (W) wire. If 115VAC is present on one end and not the other, check

CLS continuity. If open replace CLS. If CLS is closed and 115VAC is present on both

CLS (Y) wires to a neutral (W), check for check for 24VDC at DCD black (BK) wire

to DCD red (R) wire. If 24VDC is not present, check continuity of DCD driver.

If open, replace DCD driver. If 24VDC is present and LED(s) are not on, check

wiring harness and wiring connections from DCD to LED(s). Ifconnections are good

and LED(s) are not on, replace LED(s).

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 CTCD continuity.

See "II.D. Thermistor Check." and "II.E) Cabinet Temperature Control Dial (CTCD)."

If CTh or CTCD is defective, replace. If CTh and CTCD are good and either the Comp,

ConFM, and/or EvapFM (except PT models) continue, or if EvapFM on PT models

de-energizes, replace CM.

6) Defrost–Manually initiated defrost, off cycle defrost, and time-initiated

temperature-terminated heated defrost.

1a) Manually-Initiated (All): Turn the CTCD 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. Note: When refrigerator defrost is manually-initiated

EvapFM continues.

1b) Off Cycle-Inititiated: Off cycle between cooling cycles. CTh cools below CTCD.

Setting satised. Comp and CondFM de-energize. EvapFM energizes.

1c) Time/Temperature-Initiated:

(1) Refrigerator: 4-hr. defrost interval timer terminates. Control module checks CTh.

If CTh is at or below 41°F (5°C), defrost starts. If in defrost, Comp and CondFM

de-energize. EvapFM continues. 20-min. DT starts. If CTh is above 41°F (5°C),

defrost is delayed for 4 hrs. (8-hr. defrost interval timer). Once the 8-hr. defrost

interval timer terminates, defrost starts regardless of evaporator temperature.

(2) Prep Table: 6-hr. defrost timer terminates. Control module checks DTh. If DTh

is at or below 50°F (10°C), defrost starts. If in defrost, Comp, CondFM, and

EvapFM de-energize. DH energizes. 5-min. minimum DT starts and 45-min.

maximum DT starts. If DTh is above 50°F (10°C), defrost will not initiate.

(3) Freezer: 8-hr. defrost timer terminates. Control module checks DTh. If DTh is

at or below 41°F (5°C), defrost starts. If in defrost, Comp, ConFM, PH, MH,

and EvapFM de-energize. DH energizes. 5-min. minimum DT starts and 1-hr

maximum DT starts. If DTh is above 41°F (5°C), defrost will not initiate.

2a) Manually-Terminated: Turn the CTCD 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) Temperature or Time-Terminated: CTh (Refrigerator) or DTh (PT and Freezers)

achieves termination temperature or backup DT terminates.

(1) Refrigerator: 43°F (6.1°C) achieved or 20-min. backup DT terminates. If CTh

calling for cooling, Comp and CondFM energize. EvapFM continues.

(2) 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). 1-min. Comp delay timer terminates. Comp, ConFM, and EvapFM

energize.

(3) Freezers: 50°F (10°C) achieved or 1-hr. backup 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.

Defrost Diagnosis:

1) Manual-Initiation: CTCD rotated to max. position and back. Refrigerator: 4-hr min.

or 8-hr max., Prep Table: 6-hr., or Freezer: 8-hr. DT terminates. After rotating CTCD

several times and defrost still not activated, wait 1 to 2 min. and repeat process.

Replace CTCD as needed.

(1) CM Diagnosis: Conrm DH energizes (if applicable) and Comp, ConFM, and

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

(2) 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. See "II.D. Thermistor Check." Replace as needed. If DTh

conrmed, replace CM.

(3) 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. See "II.D. Thermistor Check."

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. See "II.D. Thermistor Check." Replace as needed. If

CTh conrmed, replace CM.

3) Defrost Diagnosis: Initiation: Conrm Comp is energized, then manually initiate

defrost. Rotate CTCD all the way to the right. Wait 1 to 5sec. then rotate back to

original setting. Defrost initiated.

a) UC/WT Refrigerator: Check that Comp and ConFM de-energize. EvapFM

continues.

b) Prep Table: Check that Comp, ConFM, and EvapFM de-energize. DH energizes.

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

DHenergizes.

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

attempts of manual initiation. Ifmanual initiation fails, replace CTCD.

(2) CM: If CTCD 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) Defrost Diagnosis: Termination;

a) UC/WT Refrigerator: CTh warms to 43°F (6.1°C). Conrm continuity of CTh. See

"II.D. Thermistor Check." Replace as needed. If CTh conrmed, replace CM.

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

DTh. See "II.D. Thermistor Check." Replace as needed. If DTh is good and DH

continues after DTh achieves 46°F (7.7°C), replace CM.

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

See "II.D. Thermistor Check." 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;

CLS–cabinet light switch; CTCD–cabinet temperature control dial

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. See "II.D. Thermistor

Check."

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, EvapFM, PH and MH (freezers) energize. If not check CTh

status. See "II.D. Thermistor Check." 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 CTCD 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 (continues on refrigerators), 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 CM 5 (F) (DBU) to neutral white

wire (W). If 115VAC is present, replace CM.

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.

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Hoshizaki SR27A-12M Manuel utilisateur

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Modèle: SR27A-12M

Taper: Manuel utilisateur

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