Hoshizaki HWR68A-D, HUR68A-D, HUR40A-D, HWR40A-D, HUR96A-D User Manual

Hoshizaki America, Inc.

Hoshizaki

Commercial Refrigerators & Freezers
Undercounter & Worktop Series

Models

Refrigerators
HUR40A(-D) HWR40A(-D)

“A Superior Degree

of Reliability”

www.hoshizaki.com

HUR68A(-D) HWR68A(-D)
HUR96A(-D) HWR96A(-D)

Freezers
HUF40A(-D) HWF40A(-D)
HUF68A(-D) HWF68A(-D)

SERVICE MANUAL

Number: 73123
Issued: 2-4-2005
Revised: 9-30-2008

IMPORTANT

Only qualied service technicians should attempt to service or maintain this
unit. No such service or maintenance should be undertaken until the technician
has thoroughly read this Service Manual.

Hoshizaki provides this manual primarily to assist qualied service technicians in the
service and maintenance of the unit.

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

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 3069

Attn: Hoshizaki Technical Support Department

Phone: 1-800-33-1940 Technical Support
(770) 487-331
Fax: [phone]
[phone]
E-mail: [e-mail]

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.

ENERGY STAR

®

Products earning the ENERGY STAR prevent greenhouse gas emissions by meeting strict
energy efciency guidelines set by the U.S. Environmental Protection Agency and the
U.S. Department of Energy. Several models of Hoshizaki undercounters have earned the
ENERGY STAR. To easily determine if your unit has earned the ENERGY STAR, see the
nameplate attached to the right wall on the inside of the cabinet.



Please review this manual. It should be read carefully before the unit is serviced or
maintenance operations are performed. Only qualied service technicians should service
and maintain the unit. This manual should be made available to the technician prior to
service or maintenance.

CONTENTS

I. Specications ..................................................................................................................... 5

A. Nameplate Ratings ....................................................................................................... 5

B. Dimensions ................................................................................................................... 5

1. HUR40A, HUF40A .................................................................................................. 6

1a. HUR40A-D, HUF40A-D ......................................................................................... 6

. HWR40A, HWF40A ................................................................................................. 7

a. HWR40A-D, HWF40A-D ....................................................................................... 7

3. HUR68A, HUF68A .................................................................................................. 8

3a. HUR68A-D, HUF68A-D ......................................................................................... 8

4. HWR68A, HWF68A ................................................................................................. 9

4a. HWR68A-D, HWF68A-D ....................................................................................... 9

5. HUR96A ................................................................................................................ 10

5a. HUR96A-D .......................................................................................................... 10

6. HWR96A ............................................................................................................... 11

6a. HWR96A-D ......................................................................................................... 11

II. General Information ........................................................................................................ 1

A. Construction ................................................................................................................ 1

B. Sequence of Operation and Timing Charts ................................................................ 13

1. Refrigerators – Continuous Operating Mode ........................................................ 13

. Freezers – Continuous Operating Mode ............................................................. 15

3. Refrigerators – Energy Saving Operating Mode .................................................. 17

4. Freezers – Energy Saving Operating Mode ......................................................... 19

C. Control Board ............................................................................................................. 1

1. Start-Up Delay ....................................................................................................... 1

. Control Board Layout ............................................................................................ 

D. Settings and Diagnostics ............................................................................................ 3

1. Gaining Access to Settings and Diagnostics ......................................................... 3

. Temperature Display ............................................................................................. 4

a) Switching the Display Between Fahrenheit and Celsius (F5) .......................... 4

b) Adjusting the Setpoint Temperature ................................................................ 4

c) Cabinet Temperature Correction (calibration factor) ........................................ 5

3. Settings and Diagnostics Menu ............................................................................. 6

a) Defrost Interval (F0) ......................................................................................... 7

b) Defrost Termination Temperature (F1) ............................................................ 7

c) Setpoint Temperature Differential (F) ............................................................ 8

d) High Temperature Alarm Delay Time (F3) ....................................................... 9

e) Low Temperature Alarm Delay Time (F4) ....................................................... 9

f) Temperature Display Scale (F5) ....................................................................... 30

g) Alarm History (F6) ............................................................................................ 30

h) Compressor Run Time (F7) ............................................................................. 31

3

4. Operating Modes ................................................................................................... 31

a) Continuous ....................................................................................................... 3

b) Energy Saving ................................................................................................. 3

c) Automatic Corrections Made During Energy Saving Operating Mode ............. 3

E. Perimeter Frame Heater ............................................................................................. 3

III. Service Diagnosis ........................................................................................................... 33

A. Alarm Codes ............................................................................................................... 33

1. Alarm Display Priority ............................................................................................ 34

. Alarm Details and Countermeasures .................................................................... 35

a. High Temperature Alarm (E1) .......................................................................... 35

b. Low Temperature Alarm (E) ........................................................................... 36

c. Defrost Alarm (E3) ........................................................................................... 37

d. High Pressure Alarm (E4) ................................................................................ 37

e. Clogged Filter Alarm (E7) ................................................................................ 38

f. Defrost Temperature Sensor Malfunction Alarm (E8) ....................................... 39

g. Clogged Filter Sensor Malfunction Alarm (E9) ................................................. 40

h. Control Board Error Alarms (EA and ED) ........................................................ 41

B. Diagnosis Chart .......................................................................................................... 4

C. Thermistor Check ....................................................................................................... 45

IV. Removal and Replacement of Components .................................................................. 46

A. Service for Refrigerant Lines ...................................................................................... 46

1. Refrigerant Recovery ............................................................................................ 46

. Brazing .................................................................................................................. 46

3. Evacuation and Recharge .................................................................................... 47

B. Removal and Replacement of Refrigeration Unit........................................................ 48

C. Removal and Replacement of Compressor ................................................................ 48

D. Removal and Replacement of Evaporator .................................................................. 49

E. Removal and Replacement of Capillary Tube / Suction Line Assembly ..................... 51

F. Removal and Replacement of Thermistors ................................................................. 5

G. Removal and Replacement of Door Gasket ............................................................... 53

H. Removal and Replacement of Defrost Heater ............................................................ 53

I. Removal and Replacement of Control Board ............................................................... 54

J. Removal and Replacement of Fan Motors .................................................................. 55

K. Door Re-Hinging and Drawer Conversion .................................................................. 55

V. Cleaning and Maintenance Instructions .......................................................................... 56

A. Cleaning ...................................................................................................................... 56

B. Maintenance ............................................................................................................... 57

VI. Wiring Diagrams ............................................................................................................ 58

A1. HUR40A, HWR40A (auxiliary code Q5 and earlier).................................................. 58

A. HUR40A(-D), HWR40A(-D) (auxiliary code Q6 and later) ....................................... 59

B. HUF40A(-D), HWF40A(-D) ......................................................................................... 60

C1. HUR68A, HWR68A (auxiliary code Q5 and earlier) ................................................. 61

C. HUR68A(-D), HWR68A(-D) (auxiliary code Q6 and later) ........................................ 6

D. HUF68A(-D), HWF68A(-D) ......................................................................................... 63

E. HUR96A(-D), HWR96A(-D) ........................................................................................ 64

4

I. Specications

A. Nameplate Ratings

Design Pressure

(PSIG)

Model AC Supply Voltage Amperes HI LO 404A 134a

HUR40A(-D), HWR40A(-D) 115/60/1 5.0 40 10 15.
HUR68A(-D), HWR68A(-D) 115/60/1 5.0 40 10 15.

Refrigerant

(oz.)

HUR96A(-D), HWR96A(-D) 115/60/1 6.0 40 10 15.

HUF40A(-D), HWF40A(-D) 115/60/1 5.5 450 50 14.1
HUF68A(-D), HWF68A(-D) 115/60/1 10.0 450 50 13.0

Undercounter Model Names

The undercounter models covered in this service manual initially had different model
names. If you have a unit with an auxiliary code of N-6 and a serial number ending in "H",
refer to the table below.

Model Name on
Nameplate

UR1-SSB HUR40A

UR-SSB

Current
Name

HUR68A

UF1-SSB HUF40A

UF-SSB

HUF68A

B. Dimensions

Door Opening mm Total Refrigerated

Model

HUR40A(-D), HWR40A(-D),
HUF40A(-D), HWF40A(-D)

HUR68A(-D), HWR68A(-D),
HUF68A(-D), HWF68A(-D)

HUR96A(-D), HWR96A(-D) 9.1 6.6 1

Width Height

570. 616.

Volume ft

18.8 17.1 8

3

8.5 7.6 4

Total Shelf

Space ft

2

Hotel Pan

Capacity (-D)

5

1. HUR40A, HUF40A

Units: mm (in.)

1a. HUR40A-D, HUF40A-D

6

2. HWR40A, HWF40A

Units: mm (in.)

2a. HWR40A-D, HWF40A-D

7

3. HUR68A, HUF68A

Units: mm (in.)

3a. HUR68A-D, HUF68A-D

8

4. HWR68A, HWF68A

Units: mm (in.)

4a. HWR68A-D, HWF68A-D

9

5. HUR96A

Units: mm (in.)

5a. HUR96A-D

10

6. HWR96A

Units: mm (in.)

6a. HWR96A-D

11

II. General Information

A. Construction

Hoshizaki undercounters feature a cartridge-type refrigeration unit that can be removed
without taking off the top and side panels.

Front Panel

Evaporator Assembly

Evaporator Case

Side Panel

Evaporator Case Cover

Defrost Thermostat

Defrost Heater

Compressor

Capillary Tube/Suction
Line Assembly

Thermal Fuse

Evaporator Case Cover

Control Box

Access Valve (Low-Side)

Condenser

Condenser Fan Motor

Compressor Base

Defrost Thermistor

Evaporator Shroud

Cabinet Thermistor

Evaporator Fan Motor

Evaporator

Evaporator Case

1

B. Sequence of Operation and Timing Charts

For details on operating modes, see "II.D.4. Operating Modes."

1. Refrigerators – Continuous Operating Mode

a) Sequence of Operation

POWER ON

Board Self Check

1. Frame heater(s) on
. Evaporator fan(s) on

Cycle On (Cut-on
temperature reached)
[Minimum  minutes]

1. Compressor start-up
. Condenser fan start-up

Continue as
normal cycling

2-minute Delay

1. Compressor start-up
. Condenser fan start-up

Defrost Start

Preprogrammed time interval

1. Compressor off
. Evaporator fan(s) off

3. Frame heater(s) off (Q6 and later)

4. Condenser fan off

5. Defrost heater on

6. "dF" displayed

Cycle Off (Cut-out
temperature reached)
[Minimum  minutes]

1. Compressor off
. Condenser fan off

Defrost End

Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
Defrost heater off

Five minutes after
defrost heater off

1. Compressor on
. Condenser fan on

Five minutes after
compressor start-up

1. Evaporator fan(s) on
. Frame heater(s) on
(Q6 and later)

One minute after evaporator
fan start-up "dF" no
longer displayed, cabinet
temperature displayed

Note:

1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the
"cabinet thermistor."

) The defrost thermistor reads the evaporator temperature.

3) There is a ve second evaporator fan startup delay when the compressor and
fan would otherwise start together.

13

b) Timing Chart

N
O

FF
O

NO

FF
O

FFO

NO

N
O

F
FO

)+
(

la
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fiD

+
t
niop

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effiD + t

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opt

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S

gni
nae

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NO

F
F

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N
O

F
F

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TIME-TEMPERATURE CONTROL CHART ENERGY SAVING MODE

REFRIGERATORS

1AND,ATER

1AND%ARLIER

Frame Heater(s)

Refrigerators – Continuous Operating Mode

14

2. Freezers – Continuous Operating Mode

a) Sequence of Operation

POWER ON

Board Self Check

1. Frame heater(s) on
. Evaporator fan(s) on

Cycle On (Cut-on
temperature reached)
[Minimum  minutes]

1. Compressor start-up
. Condenser fan start-up

Continue as
normal cycling

2 minute delay

1. Compressor start-up
. Condenser fan start-up

Defrost Start

Preprogrammed time interval

1. Compressor off
. Evaporator fan(s) off

3. Condenser fan off

4. Defrost heater on

5. "dF" displayed

Cycle Off (Cut-out
temperature reached)
[Minimum  minutes]

1. Compressor off
. Condenser fan off

Defrost end

Defrost thermistor
reaches defrost
termination
temperature, or defrost
timer reaches 1 hour
Defrost heater off

Five minutes after
defrost heater off

1. Compressor on
. Condenser fan on

Five minutes after
compressor start-up

1. Evaporator fan(s) on

Eight minutes after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed

Note:

1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the
"cabinet thermistor."

) The defrost thermistor reads the evaporator temperature.

3) There is a ve second evaporator fan startup delay when the compressor and
fan would otherwise start together.

15

b) Timing Chart

N
O

F
F

O

N
O

FF
O

)+(
la

i

tnere

f

f

i
D

+
tniop

teS

)--( laitnere

f

fiD + tniopteS

gn
inaem

oN

F
FO

N
O

N
O

F
F

O

N
O

F
F

O

N
O

F
F

O

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TIME-TEMPERATURE CONTROL CHART [NOT DURING ENERGY SAVING MODE] FOR

REFRIGERATORS & FREEZERS WITH AUXILIARY CODE _____ AND BEFORE

Frame Heater(s)

Freezers – Continuous Operating Mode

16

3. Refrigerators – Energy Saving Operating Mode

a) Sequence of Operation

POWER ON

Board Self Check

1. Frame heater(s) on continuously
(Q5 and earlier)

Frame heater(s) cycle on and off

(Q6 and later)

. Evaporator fan(s) cycles on and off

Cycle On (Cut-on
temperature reached)
[Minimum  minutes]

1. Compressor start-up
. Condenser fan start-up

3. Frame heater(s) on
(continuously)

4. Evaporator fan(s) on
(continuously)

Continue as
normal cycling

Defrost Start

Preprogrammed time interval

1. Compressor off
. Frame heater(s) off (Q6 and later)

3. Evaporator fan(s) off

4. Condenser fan off

5. Defrost heater on

6. "dF" displayed

2-minute Delay

1. Compressor start-up
. Condenser fan start-up

3. Frame heater(s) on
(continuously)

4. Evaporator fan(s) on
(continuously)

Cycle Off (Cut-out
temperature reached)
[Minimum  minutes]

1. Compressor off
. Condenser fan off

3. Frame heater(s)
cycle on and off
(Q6 and later)

4. Evaporator fan(s)
cycles on and off

Defrost End

Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
Defrost heater off

Five minutes after
defrost heater off

1. Compressor on
. Condenser fan on

Five minutes after
compressor start-up

1. Evaporator fan(s) on
. Frame heater(s)
on (Q6 and later)

One minute after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed

Note:

1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet

) The defrost thermistor reads the evaporator temperature.

thermistor."

17

b) Timing Chart

NO

FFO

NO

FFO

)+(
l

a

i

t
n
e

r
ef
f

i
D

+
t

n

i
o
p

teS

)-

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n

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ef

f

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+

tniopt

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S

g
n

i
n
a
e

m
oN

FFO

NO

NO

FFO

NO

FFO

NO

FFO

r
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T
t
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C

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C

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TIME-TEMPERATURE CONTROL CHART [DURING ENERGY SAVING MODE] FOR

REFRIGERATORS

WITH AUXILIARY CODE _____ AND AFTER

*

*

neh

w
y

ale
d

pu tr

a

t
s

naf rotaropave dnoc

e
s

eviF

r
eh

t
e
g
ot

t
r

ats e

s

i
w

reh
t

o dluo

w

naf dn

a
r
osse

r
pm

o
c

1AND%ARLIER

1AND,ATER

*

*

Frame Heater(s)

.n
im

2

)NO

.n
i
M

(

.
n

im
2

)
F
FO

.n
i
M

(

Refrigerators – Energy Saving Operating Mode

18

4. Freezers – Energy Saving Operating Mode

a) Sequence of Operation

POWER ON

Board Self Check

1. Frame heater(s) on
. Evaporator fan(s)
cycles on and off

Cycle On (Cut-on
temperature reached)
[Minimum  minutes]

1. Compressor start-up
. Condenser fan start-up

3. Evaporator fan(s) on
(continuously)

Continue as
normal cycling

2-minute Delay

1. Compressor start-up
. Condenser fan start-up

3. Evaporator fan(s) on
(continuously)

Defrost Start

Preprogrammed time interval

1. Compressor off
. Evaporator fan(s) off

3. Condenser fan off

4. Defrost heater on

5. "dF" displayed

Cycle Off (Cut-out
temperature reached)
[Minimum  minutes]

1. Compressor off
. Condenser fan off

3. Evaporator fan(s)
cycles on and off

Defrost End

Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
Defrost heater off

Five minutes after
defrost heater off

1. Compressor on
. Condenser fan on

Five minutes after
compressor start-up

1. Evaporator fan(s) on

Eight minutes after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed

Note:

1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the "cabinet

) The defrost thermistor reads the evaporator temperature.

thermistor."

19

b) Timing Chart

nehw

y
ale

d
pu

t
rat

s
naf

rot
a

ro
p

ave

dno

c
es

evi
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