Hoshizaki SafeTemp Service Manual

HoshizakiHoshizaki America, Inc.

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: [phone] Technical Service [phone]

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

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

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)...........................................................	37
E1. FH2-AAC(-HD) (auxiliary code P-5 and earlier).........................................................	38
E2. FH2-AAC(-HD) (auxiliary code P-6 and later)............................................................	39

I. Specifications

A. Nameplate Ratings

			Design Pressure			Refrigerant and
				(PSIG)		Refrigerant Charge
	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	115/60/1	7.0	240		120		11.6 OZ
FH2-AAC / FH2-AAC-HD	115/60/1	15.5	450		250	20.1 OZ
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

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	Total Shelf
			Refrigerated	Space ft2
	Width	Height
			Volume ft3
	mm (in.)	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)	1507 (59.3)	48.3	25.9
RH2-AAC-HD / FH2-AAC-HD	554.8 (21.8)	681.7 (26.8)	48.3
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

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.

2. RH1-AAC(-HD), FH1-AAC(-HD)

mm (in.)

* Shown with optional 6" legs; 4" casters are standard

3. RH2-AAC(-HD), FH2-AAC(-HD)

mm (in.)

* Shown with optional 6" legs; 4" casters are standard

4. RH3-AAC(-HD)

mm (in.)

* Shown with optional 6" legs; 4" casters are standard

II. General Information

A. Sequence of Operation and Timing Charts

1. Refrigerator

a) Sequence of Operation

POWER ON

1. Frame heaters on 2.0 minute delay

2. Evaporator fan on 1. Compressor start-up

2. Condenser fan start-up

Cycle Off (Cut-out temperature reached) [Minimum 2.0 minutes]

1.Compressor off

2.Condenser fan off

Cycle On (Cut-on temperature reached) [Minimum 2.0 minutes]

1.Compressor on

2.Condenser fan on

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.)

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.

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

Cycle On (Cut-on temperature reached) [Minimum 2.0 minutes]

1.Compressor on

2.Condenser fan on

Five minutes after

defrost heater off

Defrost End

1. Compressor on

Defrost thermistor

2. Condenser fan on

reaches 100°F;

3. "rEC" displayed

Defrost heater off

Evaporator temperature

drops to 70°F

1. Evaporator fan on

Cycle Off (Cut-out

Cabinet thermistor drops

temperature reached)

to 15°F above setpoint.

[Minimum 2.0 minutes]

1. "rEC" no longer

1. Compressor off

displayed; cabinet temp.

2. Condenser fan off

displayed

	Defrost Start						Defrost End
	Preprogrammed time interval						Defrost thermistor
	1. Compressor off						reaches 100°F;
	2. Evaporator fan off						Defrost heater off
	3. Condenser fan off
	4. Defrost heater on
	5. "dEF" displayed
				Cabinet thermistor drops to
				15°F above setpoint.
				1. "rEC" no longer displayed;
Normal cycling continues				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