Hoshizaki HRE-70B(-F) User manual

NO. R003-746
ISSUED: DEC. 11, 2007
REVISED: DEC. 1, 2008
HOSHIZAKI
COMMERCIAL
REFRIGERATOR/FREEZER
SERVICE MANUAL
MODEL HRE-70B(-F)
HRE-140B(-F)
HFE-70B
HFE-140B

i
CONTENTS PAGE
I. GENERAL INFORMATION --------------------------------------------------------------------------1
1. SAFETY INSTRUCTIONS-------------------------------------------------------------------------1
2. DIMENSIONS/SPECIFICATIONS ---------------------------------------------------------------3
[a] HRE-70B-------------------------------------------------------------------------------------------3
[b] HRE-140B -----------------------------------------------------------------------------------------4
[c] HFE-70B -------------------------------------------------------------------------------------------5
[d] HFE-140B -----------------------------------------------------------------------------------------6
[e] HRE-70B-F----------------------------------------------------------------------------------------7
[f] HRE-140B-F --------------------------------------------------------------------------------------8
II. TECHNICAL INFORMATION-----------------------------------------------------------------------9
1. WIRING DIAGRAM----------------------------------------------------------------------------------9
[a] HRE-70B-------------------------------------------------------------------------------------------9
[b] HRE-140B --------------------------------------------------------------------------------------- 10
[c] HFE-70B ----------------------------------------------------------------------------------------- 11
[d] HFE-140B --------------------------------------------------------------------------------------- 12
[e] HRE-70B-F-------------------------------------------------------------------------------------- 13
[f] HRE-140B-F ------------------------------------------------------------------------------------ 14
2. REFRIGERATION CIRCUIT -------------------------------------------------------------------- 15
3. ENERGY SAVING FEATURES----------------------------------------------------------------- 16
[a] FRAME HEATER ENERGIZING CONTROL ------------------------------------------- 16
[b] INTERIOR DC FAN MOTOR --------------------------------------------------------------- 17
[c] CONTROLLER BOARD---------------------------------------------------------------------- 17
[d] REFRIGERATION UNIT --------------------------------------------------------------------- 17
4. ELECTRONIC CONTROLS --------------------------------------------------------------------- 18
[a] SET POINT TEMPERATURE -------------------------------------------------------------- 18
[b] CABINET TEMPERATURE DIFFERENTIAL ------------------------------------------- 18
[c] DEFROST CYCLE ---------------------------------------------------------------------------- 18
[d] DEFROST COMPLETION TEMPERATURE ------------------------------------------- 18
[e] TEMPERATURE DISPLAY CYCLE ------------------------------------------------------- 18
[f] COMPRESSOR SOFT START------------------------------------------------------------- 19
[g] HIGH PRESSURE SWITCH---------------------------------------------------------------- 19
[h] CHECKING AND ADJUSTING SET POINT TEMPERATURE --------------------- 20
[i] MANUAL DEFROST -------------------------------------------------------------------------- 20
[j] FRAME HEATER SETTING ---------------------------------------------------------------- 20
[k] CANCELLING SOFT START --------------------------------------------------------------- 21
[l] ERROR CODES ------------------------------------------------------------------------------- 21
[m] CONTROLLER BOARD MODEL SETTING ------------------------------------------- 21
5. TIMING CHART ------------------------------------------------------------------------------------ 22
[a] STARTUP - CONTROL ---------------------------------------------------------------------- 22
[b] DEFROST --------------------------------------------------------------------------------------- 23
6. BUTTON OPERATION --------------------------------------------------------------------------- 25
[a] OPERATION PANEL LAYOUT ------------------------------------------------------------- 25
[b] BASIC OPERATION -------------------------------------------------------------------------- 25
[c] CHECKING AND DELETING ERROR RECORDS ----------------------------------- 25

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[d] ADJUSTING OPERATION SETTINGS -------------------------------------------------- 26
[e] MODEL SETTING AT CONTROLLER BOARD REPLACEMENT----------------- 28
III. SERVICE DIAGNOSIS---------------------------------------------------------------------------- 30
1. ERROR CODES ----------------------------------------------------------------------------------- 30
2. FLOWCHART--------------------------------------------------------------------------------------- 33
3. COMPONENTS ------------------------------------------------------------------------------------ 35
4. CONTROLLER BOARD-------------------------------------------------------------------------- 37
[a] SERVICING CONTROLLER BOARD ---------------------------------------------------- 37
[b] CHECKING THERMISTOR ----------------------------------------------------------------- 38
IV. REMOVAL AND REPLACEMENT OF COMPONENTS ---------------------------------- 39
1. CONTROLLER BOARD AND THERMISTOR ---------------------------------------------- 39
[a] REMOVAL OF CONTROL BOX ----------------------------------------------------------- 39
[b] REPLACEMENT OF CONTROL BOX --------------------------------------------------- 39
[c] THERMISTOR---------------------------------------------------------------------------------- 39
2. RELAY BOX ----------------------------------------------------------------------------------------- 41
[a] POWER SUPPLY BOARD ------------------------------------------------------------------ 41
3. REFRIGERATION CIRCUIT -------------------------------------------------------------------- 41
[a] COMPRESSOR-------------------------------------------------------------------------------- 41
[b] CONDENSER AND DRIER ----------------------------------------------------------------- 42
[c] EVAPORATOR --------------------------------------------------------------------------------- 42
[d] CONDENSER FAN MOTOR---------------------------------------------------------------- 43
[e] DEFROST HEATER AND THERMAL FUSE (HFE)----------------------------------- 43
4. EVAPORATION TANK ---------------------------------------------------------------------------- 44
[a] DRAIN TANK HEATER----------------------------------------------------------------------- 44
[b] THERMOSTAT --------------------------------------------------------------------------------- 45
[c] THERMAL FUSE------------------------------------------------------------------------------- 45
5. AIR DUCT-------------------------------------------------------------------------------------------- 45
[a] AIR DUCT --------------------------------------------------------------------------------------- 45
[b] INTERIOR FAN MOTOR -------------------------------------------------------------------- 46
6. DOOR PARTS -------------------------------------------------------------------------------------- 46
[a] DOOR HANDLE ------------------------------------------------------------------------------- 46
[b] HINGE SPACER ------------------------------------------------------------------------------- 47
[c] LIFT HINGE ------------------------------------------------------------------------------------- 47
[d] DOOR GASKET ------------------------------------------------------------------------------- 47
7. CONDENSER CLEANING PAN---------------------------------------------------------------- 48
8. OPTIONAL PARTS -------------------------------------------------------------------------------- 48
[a] HINGE KIT -------------------------------------------------------------------------------------- 48
[b] GASTRONOME PAN RAIL------------------------------------------------------------------ 49

1
I. GENERAL INFORMATION
1. SAFETY INSTRUCTIONS
The following instructions contain important safety precautions and should be strictly
observed. The terms used here are dened as follows:
WARNING: There is a possibility of death or serious injury to the service person and
a third party or the user due to improper service operations or defects in
serviced products.
CAUTION: There is a possibility of injury to the service person and a third party or the
user or damage to their property* due to improper service operations or
defects in serviced products.
* The term “damage to their property” here refers to extensive damage to household
effects, houses and pets.
WARNING
1. Always ask the user to keep children away from the work area. They may be injured by
tools or disassembled products.
2. When there is no need to energize the unit during disassembly or cleaning, be sure to
unplug the unit or disconnect the main power supply before servicing the unit to prevent
electric shocks.
3. If the unit must be energized for inspection of the electric circuit, use rubber gloves to
avoid contact with any live parts resulting in electric shocks.
4. Keep the following in mind when servicing the refrigeration circuit:
(1) Be sure to recover the refrigerant. Do not discharge it into the atmosphere. It will
affect the environment.
(2) Check for any ames in the vicinity, and ensure good ventilation.
(3) If the refrigerant should leak in servicing, immediately put out any re used in the
vicinity.
(4) When unbrazing the refrigeration circuit connections, check that the circuit is
completely evacuated. The refrigerant may produce a poisonous gas when coming
in contact with an open ame.
(5) Do not braze in an enclosed room to prevent carbon monoxide poisoning.
(6) In case of a refrigerant leak, locate and repair the leaking part completely before
recharging the refrigerant and checking for further leaks. If the leaking part cannot

2
be located, be sure to check again for further leaks after recharging the refrigerant.
Leaked refrigerant may produce a poisonous gas when coming in contact with an
open ame of a gas cooking stove or a fan heater.
(7) Before servicing, check the surface temperature of the refrigeration circuit to
prevent a burn.
5. Keep the following in mind when making electrical connections:
(1) Check for proper earth connections, and repair if necessary to prevent electric
shocks.
(2) Always use service parts intended for the applicable model for replacement of
defective parts. Use proper tools to secure the wiring. Otherwise abnormal
operation or trouble may occur and cause electric leaks or re.
(3) Check for proper part installations, wiring conditions and soldered or solderless
terminal connections to avoid re, heat or electric shocks.
(4) Be sure to replace damaged or deteriorated power cords and lead wires to prevent
re, heat or electric shocks.
(5) Cut-off lead wires must be bound using closed end connectors or the like, with their
closed ends up to avoid entrance of moisture that could lead to electric leaks or
re.
(6) After servicing, always use a megohmmeter (500V DC) to check for the insulation
resistance of at least 1 megohm between the live part (attachment plug) and the
dead metal part (earth terminal).
(7) Do not service the electrical parts with wet hands to prevent electric shocks.
(8) The capacitors used for the compressor and other components may be under high
voltage and should be discharged properly before servicing.
CAUTION
1. After servicing, follow the instructions below:
(1) Always check the unit for proper operation before nishing services.
(2) Be sure to reassemble the parts completely. Loose assembly of such parts
as control box cover may cause entrance of vermins resulting in a short circuit
between terminals and possible ignition.

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2. DIMENSIONS/SPECIFICATIONS
[a] HRE-70B

4
[b] HRE-140B

5
[c] HFE-70B

6
[d] HFE-140B

7
[e] HRE-70B-F

8
[f] HRE-140B-F

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II. TECHNICAL INFORMATION
1. WIRING DIAGRAM
[a] HRE-70B

10
[b] HRE-140B

11
[c] HFE-70B

12
[d] HFE-140B

13
[e] HRE-70B-F

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[f] HRE-140B-F

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2. REFRIGERATION CIRCUIT
Refrigerant: HFC-134a (HRE series)
HFC-404A (HFE series)

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3. ENERGY SAVING FEATURES
[a] FRAME HEATER ENERGIZING CONTROL
The Frame Heater is energized intermittently to keep the Front Frame surfaces at the
optimum temperature for preventing condensation. As the optimum surface temperature
depends on the ambient temperature, the ratio between ON time and OFF time is
determined by the difference between the ambient temperature (measured by the
Temperature Sensor built in the Controller Board) and the cabinet temperature (measured
by the Interior Thermistor). This duty ratio has eight patterns and is updated every two
minutes.
The duty ratios are sorted into seven levels (HRE series) or six levels (HFE series)
depending on the difference between the ambient and cabinet temperatures. The higher
levels at the same ambient and cabinet temperatures mean the higher duty ratios. The
unit is factory adjusted to level 2.
The user is allowed to choose between levels 2 and 3 only, and service persons between
levels 0 - 6 (HRE series) or 1 - 6 (HFE series).
[Reference]
Level 2: No condensation at ambient temperature 35°C, relative humidity 70%
Level 3: No condensation at ambient temperature 35°C, relative humidity 80%
Duty Ratio
(%)
ON time
(sec)
OFF time
(sec)
Ambient temp - cabinet temp
HRE series HFE series
Level 3 Level 2 Level 3 Level 2
12.5 15 105 5 or less 14 or less 9 or less 23 or less
25 30 90 5 - 10 14 - 19 9 - 16 23 - 30
37.5 45 75 10 - 14 19 - 24 16 - 23 30 - 37
50 60 60 14 - 19 24 - 28 23 - 30 37 - 44
62.5 75 45 19 - 24 28 - 33 30 - 37 44 - 52
75 90 30 24 - 28 33 - 37 37 - 44 52 - 59
87.5 105 15 28 - 33 37 - 41 44 - 52 59 - 66
100 120 0 33 or more 41 or more 52 or more 66 or more
[Relations between duty ratio and ambient and cabinet temperature differences]
HRE series duty ratio
Level 0: Constantly OFF
Level 2: Factory adjustment
Level 6: Constantly ON

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HFE series duty ratio
Level 2: Factory adjustment
Level 6: Constantly ON
The heater control reduces the power consumption, and the less heat invasion into the
cabinet improves the refrigeration unit operating efciency, resulting in signicant energy
saving effects.
[b] INTERIOR DC FAN MOTOR
The highly efcient DC brushless motor reduces the power consumption of the motor body
from 21 W to 4 W with the same output. Also, the lower heating value prevents cabinet
temperature rise and improves the refrigeration unit operating efciency, resulting in energy
saving effects.
[c] CONTROLLER BOARD
To save energy, HRE series stops energizing the Frame Heater for a maximum of 15
minutes during a defrost cycle (HFE series has an energizing control).
[d] REFRIGERATION UNIT
Provided with the best matched Capillary Tubes for refrigerant control.
Plastic Unit Base and Unit Frame in shape to minimize heat input/output.
Corrosion resistant aluminum Evaporator with boehmite treated and clear coated surfaces.