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D. Diagnostic Chart

1. Unit Not Cooling

Problem

Possible Cause

Remedy

[1] Unit does not

start.

a) Power Supply

1. Unplugged, off, blown fuse,

or tripped or defective circuit
breaker.

1. Turn on, reset, or replace.

2. Loose connection.

2. Tighten.

3. Not within specifications.

3. Refer to nameplate and correct.

b) Cord and Plug

1. Defective.

1. Replace.

c) Power Switch
(Control Box)

1. "OFF" Position.

1. Move to "ON" position.

2. Bad contacts.

2. Check for continuity and replace.

d) Control Transformer

1. Open coil winding.

1. Check continuity and replace.

e) Wiring

1. Loose connection or open.

1. Tighten, check for continuity and

repair.

2. Faulty.

2. Check continuity and replace.

f) Control Board

1. In alarm.

1. See "II.D.3. LED Lights and Alarm

Safeties Chart."

2. Defective.

2. Replace.

g) High Pressure Switch

(3 pressure trips in
1 hour, 6 beep alarm)

1. Bad contacts.

1. Check continuity and replace.

2. Dirty air filter or condenser.

2. Clean

3. Ambient temperature too

warm.

3. Reduce temperature.

4. Refrigerant overcharge.

4. Recharge.

5. Condenser fan not operating. 5. Replace.
6. Refrigerant lines or

components restricted.

6. Recover, repair, replace drier,

evacuate, and recharge.

h) Cabinet Thermistor

1. Defective.

1. Replace.

i) Clogged Filter Thermostat 1. Clogged filter or condenser.

1. Clean filter or condenser coil.

2. Defective.

2. Replace.

[2] Evaporator fan

does not start.

a) Evaporator Fan Motor

1. Defective.

1. Replace.

b) Control Board

1. Defective.

1. See "IV.B. Control Board Check."

[3] Cool down

does not start.
(compressor)

a) Setpoint

1. Incorrect.

1. Correct setpoint.

Factory defaults:
Refrigerator 36°F (2°C).

b) Cabinet Thermistor

1. Defective.

1. Check thermistor reading and

position. Replace.

c) Control Board

1. In alarm.

1. See "II.D.3. LED Lights and Alarm

Safeties Chart."

2. Defective.

2. See "IV.B. Control Board Check."

d) High Pressure Switch

(5 pressure trips in
1 hour, 6 beep alarm)

1. Bad contacts.

1. Check continuity and replace.

2. Dirty air filter or condenser.

2. Clean.

3. Ambient temperature too

warm.

3. Reduce temperature.

4. Refrigerant overcharge.

4. Recharge.

5. Condenser fan not operating. 5. Replace.
6. Refrigerant lines or

components restricted.

6. Recover, repair, replace drier,

evacuate, and recharge.

e) Compressor Relay

1. Bad contacts.

1. Replace.

2. Open coil windings.

2. Replace.

f) Electronic Unit

1. Defective.

1. See "IV.A. Diagnostic Procedure."

Содержание RH1-SSE-FG

Страница 1: ...shizaki A Superior Degree of Reliability www hoshizaki com Model SSE Professional Series Refrigerated Kitchen Equipment Hoshizaki America Inc Number 73177 Issued 4 14 2010 Revised 9 17 2015 SERVICE MANUAL ...

Страница 2: ...ould 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 Support 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail t...

Страница 3: ... Dip Switch Settings 17 b Unit Operation Freezer Refrigerator S3 dip switch 1 17 c Cabinet Light Heated Glass Door S3 dip switch 2 18 d Door Switch Type S3 dip switch 3 18 e Reach In Pass Thru Defrost Initiation Temperature S3 dip switch 4 18 f Display Board Operation S3 dip switch 5 18 g Dual Temp Unit S3 dip switch 6 19 h Freezer Evaporator Fan Operation except RFH1 S3 dip switch 7 19 i RFH1 Con...

Страница 4: ...2 Evaporator is Frozen Up 33 3 Defrost Fails to Terminate 33 4 Other 33 V Removal and Replacement of Components 34 A Service for Refrigerant Lines 34 1 Refrigerant Recovery 34 2 Brazing 35 3 Evacuation and Recharge R 134a 35 B Removal and Replacement of Compressor 36 C Removal and Replacement of Compressor Electronic Unit 37 D Removal and Replacement of Expansion Valve 38 E Removal and Replacement...

Страница 5: ...at generation or fire THIS UNIT MUST BE GROUNDED This unit is equipped with a 3 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 qualified electrician replace it with a properly grounded independent 3 prong wall outlet Do not r...

Страница 6: ...play Board Top Cover Front Panel Door Door Lock Door Gasket Control Box Power Switch Perimeter Heater Switch Door Latch Cabinet Thermistor Defrost Thermistor Evaporator Case Cover Models RH1 SSE FG RH1 SSE HG RH1 SSE FS RH1 SSE HS Control Box Cover Model Shown RH1 SSE FG Light Switch glass door model Door Switch Compressor and Compressor Electronic Unit ...

Страница 7: ...ndenser Condenser Air Filter Display Board Top Cover Front Panel Door Lock Door Gasket Control Box Power Switch Perimeter Heater Switch Cabinet Thermistor Defrost Thermistor Evaporator Case Cover Model Shown RH2 SSE HS Control Box Cover Door Latch Door Light Switch glass door model Door Switch Compressor and Compressor Electronic Unit ...

Страница 8: ...orator Control Board Condenser Fan Motor Condenser Condenser Air Filter Display Board Top Cover Front Panel Door Door Lock Door Gasket Control Box Power Switch Perimeter Heater Switch Cabinet Thermistor Defrost Thermistor Evaporator Case Cover Model Shown RH3 SSE FS Control Box Cover Door Latch Door Switch Light Switch glass door model ...

Страница 9: ... cools to 3 F 1 7 C below setpoint EvapFM continues Comp ConFM and PH de energize d Cool Down Restart LEDs 4 and 5 on CTh warms to 3 F 1 7 C above setpoint EvapFM continues Comp ConFM and PH energize e Defrost LED 5 on 1a Temperature Initiated Defrost DTh cools to 13 F 10 C Comp and PH if energized de energize EvapFM continues If energized ConFM continues otherwise ConFM energizes Cabinet temperat...

Страница 10: ... in control EvapFM energized 2 5 minute Comp delay timer starts EvapFM continues Comp de energized ConFM de energized PH de energized CTh cools to 3 F 1 7 C below setpoint CTh warms to 3 F 1 7 C above setpoint 4 Defrost DTh cools to 13 F 10 C or optional defrost timer terminates EvapFM continues ConFM continues Comp de energized PH de energized 5 Defrost Termination EvapFM continues ConFM continue...

Страница 11: ... From the guarded access menu the cabinet setpoint defrost frequency and temperature display scale can be adjusted For further details see II D 5 Guarded Access Menu From the service menu information regarding unit functions can be obtained For further details see II D 6 Service Menu Ribbon Cable Connector LED Display Up and Down Buttons ENTER Button RESET Button P N 2A0883 01 Fig 2 Display Board ...

Страница 12: ...the metal part of the unit before handling or replacing the control board 3 Do not touch the electronic devices on the control board or the back of the control board 4 Do not change wiring and connections Never misconnect terminals 5 Always replace the whole control board assembly if it goes bad 6 Do not short out power supply to test for voltage 7 Keep the thermistor leads clogged filter thermost...

Страница 13: ...ator Fan Motor dark blue 4 Open 5 Cabinet Light light blue 6 Open 7 Open 8 Open 9 Power Switch Input black 10 Compressor Relay gray K5 Connector 5VDC Open K4 Connector 5VDC Cabinet Thermistor gray GY K3 Connector 5VDC Defrost Thermistor orange O S1 ALARM RESET Button S2 OUTPUT TEST Button K2 Connector 10VAC K7 Connector Display Cable S3 Dip Switch X3 X2 X1 X4 X5 LED 5 X5 Relay Condenser Fan Motor ...

Страница 14: ...erminated defrost For details see II D 5 b Defrost Frequency f Default Safety Program Cabinet Thermistor In the event the cabinet thermistor reading is out of range the compressor operates on a fixed time basis of 5 minutes on and 5 minutes off Defrost Thermistor In the event the defrost evaporator thermistor reading is out of range defrost initiation occurs every 6 hours and terminates at 40 F ca...

Страница 15: ...ontinues to flash E2 4 Low Temperature Alarm Cabinet temperature has remained below setpoint by 8 F 4 4 C for more than 1 hour Press the display board RESET button If temperature has returned to setpoint range alarm stops and E2 clears If the temperature is not back in range pressing the display board RESET button temporarily silences the alarm for 5 minutes E2 continues to flash E3 5 N A Freezer ...

Страница 16: ...NG If this alarm occurs frequently discharge temperature is consistently too high Failure to take action could result in damage to the compressor Clean filter Allow time for thermostat to react then press the display board RESET button During alarm press the display board RESET button to silence alarm for 2 hours door 2 Door open Display alternates between cabinet temperature and door Door open lo...

Страница 17: ...Board Operation 5 Door Switch Type Rocker Plunger 3 Cabinet Light Heated Glass Door 2 Freezer Evaporator Fan Operation except RFH1 7 Reach In Pass Thru Defrost Initiation Temperature 4 Dual Temp Unit 6 RFH1 Condensate Pan Heater Operation 8 b Unit Operation Freezer Refrigerator S3 dip switch 1 This setting determines whether the control board operates in refrigerator mode or freezer mode It also d...

Страница 18: ...ed to select the type of switch used on a particular model Factory set no adjustment required S3 Dip Switch Setting Door Switch Type Rocker or Plunger No 3 OFF Rocker Door Switch square Open Contacts when Doors are Open ON Plunger Door Switch round Closed Contacts when Doors are Open e Reach In Pass Thru Defrost Initiation Temperature S3 dip switch 4 Refrigerators only Pass Thru refrigerator model...

Страница 19: ...e Compressor After Defrost Evap Fan Restarts when Defrost Thermistor Reaches 0 F 17 7 C ON Continuous Evap Fan except during defrost After Defrost Evap Fan Restarts when Defrost Thermistor Reaches 70 F 21 C i RFH1 Condensate Pan Heater Operation S3 dip switch 8 Active when S3 dip switch 1 is in the OFF position freezer application and S3 dip switch 6 is in the ON position Dual Temp application Whe...

Страница 20: ...ycle defrost initiated by temperature or time During defrost the cabinet temperature is displayed and the condenser fan motor and evaporator fan motor are energized Defrost Initiation Temperature 13 F 10 C 8 F 13 3 C for pass thru units Defrost Termination Temperature 40 F 4 4 C Defrost Initiated Time Adjustable between 0 and 12 defrosts per 24 hrs The factory default setting is 0 Before changing ...

Страница 21: ...ay scale follow the steps below 1 Press and hold the up and down buttons simultaneously for 3 seconds Press the ENTER button until F or C temperature display scale is displayed 2 To change the temperature display press the up or down buttons until the desired scale is displayed The factory default is F 3 Press the ENTER button to save the value and return to normal display mode If you do not press...

Страница 22: ...ur Example 16 hours total run time in the last 24 hours 5 50 Right two digits represent compressor on time percentage for the last 5 run cycles A run cycle begins when the compressor switches from off to on and ends the next time it switches from off to on See diagram below Example 50 run time over the last 5 run cycles Value is calculated as follows Percent On Time On Time Last 5 Cycles Total Tim...

Страница 23: ... Note Time may vary with high pressure switch or thermal overload activation F Perimeter Heater This unit is equipped with a perimeter heater The perimeter heater is controlled by the perimeter heater switch located on the control box To help prevent the formation of condensation on the front frame turn the perimeter heater on perimeter heater switch red marking visible When on the perimeter heate...

Страница 24: ...24 III Technical Data A Wiring Diagrams 1 RH_ SSE XX FG HG FS or HS Models Transformer Ouput 10V at 115VAC Input ...

Страница 25: ...25 2 PTR_SSE XXXX FSFS HSHS FGFG HGHG HGHS Models Transformer Ouput 10V at 115VAC Input ...

Страница 26: ...s in IV B Control Board Check For factory default settings see II D 4 a Default Dip Switch Settings The service menu may used to view history information To access the service menu press and hold the up and down buttons and ENTER button simultaneously for 3 seconds Scroll through the service menu list using the ENTER button For further details see II D 6 Service Menu As you go through the diagnost...

Страница 27: ...or 115VAC at Comp relay orange O wire to Comp relay red R wire If 115VAC is present Comp relay is bad and must be replaced If 115VAC is not present check for 115VAC at Comp relay red R wire to any white W neutral wire If 115VAC is not present electronic unit is bad and must be replaced If 115VAC is present and Comp is not on remove the electronic unit to access Comp terminals Next check for 80VAC ...

Страница 28: ...gray GY wire to any white W neutral wire If 115VAC is present CB is bad and must be replaced If Comp is on and 115VAC is not present check Comp relay for closed contacts Confirm EvapFM and ConFM continue to run If not check for 115VAC at K1 connector pin 3 dark blue DBU wire to any white W neutral wire for EvapFM and 115VAC at red K9 connector pin 2 brown BR to any white W neutral wire for ConFM I...

Страница 29: ...If the secondary circuit does not have proper voltage check the control transformer primary circuit Check the power switch to a white W neutral wire 3 The OUTPUT TEST button provides a relay sequence test Move the power switch to the ON position Next press the OUTPUT TEST button The control board cycles through all relays in sequence The correct LED lighting sequence is 3 2 1 4 5 Note that the ord...

Страница 30: ... 3 Remove the cabinet and defrost thermistors See V K Removal and Replacement of Thermistor 4 Disconnect the cabinet thermistor gray GY wires from the RED K3 connector or the defrost thermistor orange O wires from the WHITE K3 connector 5 Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes 6 Check the resistance between the wires at the thermistor connector...

Страница 31: ...frigerant lines or components restricted 6 Recover repair replace drier evacuate and recharge h Cabinet Thermistor 1 Defective 1 Replace i Clogged Filter Thermostat 1 Clogged filter or condenser 1 Clean filter or condenser coil 2 Defective 2 Replace 2 Evaporator fan does not start a Evaporator Fan Motor 1 Defective 1 Replace b Control Board 1 Defective 1 See IV B Control Board Check 3 Cool down do...

Страница 32: ... opened too often 1 Close check for door open at time of warm cabinet temperature 2 Not sealing 2 Check for proper sealing e Cabinet Thermistor 1 Defective 1 Check thermistor reading and position Replace f Clogged Filter Thermostat 1 Clogged filter or condenser coil 1 Clean filter or condenser coil 2 Defective 2 Replace g Evaporator 1 Clogged or frozen 1 Clean Defrost and check defrost cycle h Eva...

Страница 33: ...ns 1 See II D 5 b Defrost Frequency c Control Board 1 Defective 1 See IV B Control Board Check 2 Compressor operates during defrost a Compressor Relay 1 Bad Contacts 1 Replace relay b Control Board 1 Defective 1 Replace 4 Other 1 Abnormal Noise a Fasteners 1 Loose fasteners allow vibration of part 1 Tighten fasteners b Compressor 1 Problem with mount or electronic unit 1 Properly mount compressor ...

Страница 34: ...40 PSIG DO NOT use R 134a as a mixture with pressurized air for leak testing CAUTION 1 Do not leave the system open for longer than 15 minutes when replacing or servicing parts The Polyol Ester POE oils used in R 134a units can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts 2 Always install a new drier every time the...

Страница 35: ...ing 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 Note Because the pipes in the...

Страница 36: ...CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 flow 3 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...

Страница 37: ...lug the unit back in Move the power switch to the ON position 18 Close the front panel C Removal and Replacement of Compressor Electronic Unit CAUTION Do not attempt to repair the compressor electronic unit 1 Raise the front panel then move the power switch to the OFF position and unplug the unit 2 Remove the rear panel 3 Loosen the 2 screws securing the compressor electronic unit to the compresso...

Страница 38: ... disconnect the expansion valve Place the new expansion valve in position 6 Remove the drier then place the new drier in position 7 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG See V A 2 Brazing 8 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 ...

Страница 39: ...e pipes in the evaporator case are specially coated to resist corrosion Use sandpaper to remove the coating from the brazing connections before unbrazing 5 Place the new evaporator in position 6 Remove the drier then place the new drier in position 7 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG See V A 2 Brazing 8 Use an electronic leak detector or soap b...

Страница 40: ...t back in Move the power switch to the ON position 8 Close the front panel G Removal and Replacement of Door Gasket Remove old gasket by pulling it directly out of the vinyl gasket retainer Thoroughly clean the gasket area with mild soap and water prior to installing the new gasket The new gasket should be installed by assembling it at the corners first then working toward the center at the top bo...

Страница 41: ...ve the top pivot pin and hinge washer from the top hinge bracket 6 Firmly grasp the door and pull it forward at the top Then raise the door disengaging it from the bottom pivot pin 7 Remove the spring guide pin and spring from the spring cartridge 8 Replace the spring with one of the same color Be certain that the spring ends are engaged in both the spring cartridge and the top of the spring guide...

Страница 42: ...r 3 Unhook all wiring connections to the control board 4 Remove the control board by carefully squeezing the tips of the board mounts 5 Verify that the S3 dip switches are set correctly See II D 4 a Default Dip Switch Settings 6 Place the control board into its correct position taking care not to damage it 7 Connect all wiring connections to the control board 8 Replace the control box cover in its...

Страница 43: ...ol board 8 Replace the evaporator case cover and control box cover 9 Plug the unit back in Move the power switch to the ON position 10 Close the front panel 2 Defrost Thermistor 1 Raise the front panel Move the power switch to the OFF position then unplug the unit 2 Remove the evaporator case cover 3 Remove the control box cover 4 Disconnect the defrost thermistor connector orange O wires from the...

Страница 44: ...eriodically with a mild soap or detergent 3 Door Gaskets Door gaskets should be cleaned regularly with mild soap and water to remove dirt and grease 4 Air Filter Check the filter at least once a month If it is dirty use warm water and a neutral cleaner to wash the filter Fig 6 5 Condenser Check the condenser once a year and use a brush or vacuum cleaner to clean the unit as required 6 Glass Door W...

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