Hoshizaki SafeTemp Service Manual
Hoshizaki America, Inc.
Hoshizaki
Commercial Refrigerators & Freezers
Models
SafeTemp®
“A Superior Degree
of Reliability”
www.hoshizaki.com
SERVICE MANUAL
Number: 73096
Issued: 10-9-2000
Revised: 3-7-2007
IMPORTANT
Only qualified 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 qualified 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 30269
Attn: HOSHIZAKI Technical Support Department
Phone: 1-800-233-1940 Technical Service
(770) 487-2331
Fax: 1-800-843-1056
(770) 487-3360
E-mail: techsupport@hoshizaki.com
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
Please review this manual. It should be read carefully before the unit is serviced or
maintenance operations are performed. Only qualified service technicians should service
and maintain the unit. This manual should be made available to the technician prior to
service or maintenance.
CONTENTS
I. Specifications ...................................................................................................................... 5
A. Nameplate Ratings........................................................................................................ 5
B. Dimensions ................................................................................................................... 5
1. Notes for All Units .................................................................................................... 5
2. RH1-AAC(-HD), FH1-AAC(-HD) .............................................................................. 6
3. RH2-AAC(-HD), FH2-AAC(-HD) .............................................................................. 7
4. RH3-AAC(-HD) ........................................................................................................ 8
II. General Information ........................................................................................................... 9
A. Sequence of Operation and Timing Charts ................................................................... 9
1. Refrigerator ............................................................................................................. 9
2. Freezer .................................................................................................................. 11
B. Control Module ............................................................................................................ 13
1. Settings and Adjustments. ..................................................................................... 13
2. Service Menu ........................................................................................................ 14
C. Thermistors ................................................................................................................. 16
1. Cabinet Thermistor (SEN1: white and black leads) ............................................... 16
2. Defrost Thermistor (SEN2: black and red leads) .................................................. 16
3. Thermistor Check Procedure ................................................................................. 16
D. Compressor Protector ................................................................................................. 17
E. Safety Devices ............................................................................................................ 17
1. Pressure Switch ..................................................................................................... 17
2. Defrost Protection .................................................................................................. 17
F. Perimeter Frame Heater .............................................................................................. 17
III. Service Diagnosis ........................................................................................................... 18
A. Diagnosis Chart .......................................................................................................... 18
IV. Removal and Replacement of Components ................................................................... 21
A. Service for Refrigerant Lines ...................................................................................... 21
1. Refrigerant Recovery ............................................................................................. 21
2. Brazing .................................................................................................................. 21
3. Evacuation and Recharge [R-134a, R-404A] ........................................................ 22
B. Removal and Replacement of Compressor ................................................................ 23
C. Removal and Replacement of Expansion Valve ......................................................... 24
D. Removal and Replacement of Evaporator .................................................................. 25
E. Removal and Replacement of Door Gasket ................................................................ 25
F. Removal and Replacement of Door Closure Spring .................................................... 26
G. Door Re-Hinging ......................................................................................................... 27
H. Removal and Replacement of Control Module ........................................................... 28
I. Removal and Replacement of Thermistors .................................................................. 29
3
V. Cleaning Instructions ....................................................................................................... 32
VI. Wiring Diagrams ............................................................................................................. 33
A. RH1-AAC(-HD) ............................................................................................................ 33
B. RH2-AAC(-HD) ............................................................................................................ 34
C. RH3-AAC(-HD) ............................................................................................................ 35
D1. FH1-AAC(-HD) (auxiliary code P-7 and earlier) ........................................................ 36
D2. FH1-AAC(-HD) (auxiliary code P-8 and later) ...........................................................
E1. FH2-AAC(-HD) (auxiliary code P-5 and earlier) ........................................................ 38
E2. FH2-AAC(-HD) (auxiliary code P-6 and later) ........................................................... 39
37
4
I. Specifications
A. Nameplate Ratings
Design Pressure
(PSIG)
AC Supply Voltage Amperes HI LO R-404A R-134a
RH1-AAC / RH1-AAC-HD 115/60/1 5.0 240 120 9.3 OZ
FH1-AAC / FH1-AAC-HD 115/60/1 12 475 250 15.2 OZ
RH2-AAC / RH2-AAC-HD
FH2-AAC / FH2-AAC-HD
RH3-AAC / RH3-AAC-HD 115/60/1 12.0 250 120 20.6 OZ
RH1-AAC-W 115/60/1 7.0 450 200 12.2 OZ
115/60/1 7.0 240 120 11.6 OZ
115/60/1 15.5 450 250 20.1 OZ
Refrigerant and
Refrigerant Charge
B. Dimensions
1. Notes for All Units
1) Units shipped with 4" casters
2) Optional legs have 25.4 mm (1 in.) height adjustment
Door Opening Total
Width
mm (in.)
RH1-AAC / FH1-AAC 554.8 (21.8) 1507 (59.3) 22.3 11.5
RH1-AAC-HD / FH1-AAC-HD 554.8 (21.8) 681.7 (26.8) 22.3
RH2-AAC / FH2-AAC 554.8 (21.8)
RH2-AAC-HD / FH2-AAC-HD 554.8 (21.8) 681.7 (26.8)
RH3-AAC 554.8 (21.8) 1507 (59.3) 73.7 40.3
RH3-AAC-HD 554.8 (21.8) 681.7 (26.8) 73.7
Height
mm (in.)
1507 (59.3) 48.3 25.9
Refrigerated
Volume ft
3
48.3
Total Shelf
Space ft
2
See the nameplate for electrical and refrigeration specifications. The nameplate is
located on the right side wall of the cabinet interior.
Note: We reserve the right to make changes in specifications and design without prior
notice.
5
2. RH1-AAC(-HD), FH1-AAC(-HD)
mm (in.)
* Shown with optional 6" legs; 4" casters are standard
6
3. RH2-AAC(-HD), FH2-AAC(-HD)
mm (in.)
* Shown with optional 6" legs; 4" casters are standard
7
4. RH3-AAC(-HD)
mm (in.)
* Shown with optional 6" legs; 4" casters are standard
8
II. General Information
A. Sequence of Operation and Timing Charts
1. Refrigerator
a) Sequence of Operation
POWER ON
1. Frame heaters on
2. Evaporator fan on
Cycle On (Cut-on
temperature reached)
[Minimum 2.0 minutes]
1. Compressor on
2. Condenser fan on
2.0 minute delay
1. Compressor start-up
2. Condenser fan start-up
If evaporator temperature
reaches 13°F, unit initiates
defrost. Defrost initiation for
RH1-AAC-W is 7°F.
1. Compressor off
2. Condenser fan off
(Note: Evaporator fan is on.)
Cycle Off (Cut-out
temperature reached)
[Minimum 2.0 minutes]
1. Compressor off
2. Condenser fan off
Evaporator temperature
reaches 40°F, defrost
terminated
1. Compressor on
2. Condenser fan on
Normal cycling continues
Note: The start circuit of the compressor is timed such that at power-up and during any
compressor off time, there will be at least a 2 minute delay before the compressor
will start. The compressor has a 2 minute minimum run time during every run
cycle. The only exception is when the overload activates and deactivates.
9
b) Timing Chart
For Refrigerator
10
2. Freezer
a) Sequence of Operation
POWER ON
Initiate Defrost
1. Compressor off
2. Evaporator fan off
3. Condenser fan off
4. Defrost heater on
5. "dEF" displayed
6. Frame heaters on
Defrost End
Defrost thermistor
reaches 100°F;
Defrost heater off
Five minutes after
defrost heater off
1. Compressor on
2. Condenser fan on
3. "rEC" displayed
Evaporator temperature
drops to 70°F
1. Evaporator fan on
Cycle On (Cut-on
temperature reached)
[Minimum 2.0 minutes]
1. Compressor on
2. Condenser fan on
Defrost Start
Preprogrammed time interval
1. Compressor off
2. Evaporator fan off
3. Condenser fan off
4. Defrost heater on
5. "dEF" displayed
Normal cycling continues
Cycle Off (Cut-out
temperature reached)
[Minimum 2.0 minutes]
1. Compressor off
2. Condenser fan off
Defrost End
Defrost thermistor
reaches 100°F;
Defrost heater off
Cabinet thermistor drops to
15°F above setpoint.
1. "rEC" no longer displayed;
cabinet temp. displayed
Cabinet thermistor drops
to 15°F above setpoint.
1. "rEC" no longer
displayed; cabinet temp.
displayed
Five minutes after
defrost heater off
1. Compressor on
2. Condenser fan on
3. "rEC" displayed
Evaporator temperature
drops to 70°F
1. Evaporator fan on
Note: For freezers, defrost will be initiated at power-up. To bypass initial defrost, press
and hold the up arrow button on the control module while turning on the toggle
switch. The display should read a temperature. There will be at least a 2 minute
delay before the compressor will start even if the initial defrost cycle is bypassed.
The compressor has a 2 minute minimum run time during every run cycle. The
only exception is when the overload activates and deactivates.
11
b) Timing Chart
For Freezer
12
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