Hoshizaki America, Inc.
Hoshizaki
Undercounter Refrigerator
Model
HR24A
SERVICE MANUAL
“A Superior Degree
of Reliability”
Number: 73187
Issued: 12-7-2011
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IMPORTANT
This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this booklet for any further reference that may be necessary.
CONTENTS
Important Safety Information ................................................................................................. 5
I. Specifications...................................................................................................................... 7
A. Electrical and Refrigerant Data ..................................................................................... 7
B. Storage Capacity and Dimensions................................................................................ 7
1. Storage Capacity...................................................................................................... 7
2. Dimensions.............................................................................................................. 8
II. General Information........................................................................................................... 9
A. Construction.................................................................................................................. 9
B. Sequence of Operation ............................................................................................... 10
1. Sequence Cycles and Shutdown ........................................................................... 10
2. Sequence Flow Chart............................................................................................ 12
C. Control Board and Display Module.............................................................................. 13
1. Control Board Layout ............................................................................................. 14
2. Display Module Layout .......................................................................................... 14
D. Cabinet Temperature................................................................................................... 15
E. Display Module Icons.................................................................................................. 16
F. Control Panel Lockout.................................................................................................. 16
G. Alarm Safeties............................................................................................................. 17
H. Service Menu.............................................................................................................. 18
III. Technical Data ................................................................................................................ 24
A. Refrigeration Circuit .................................................................................................... 24
B. Wiring Diagram............................................................................................................ 25
IV. Service Diagnosis........................................................................................................... 26
A. Diagnostic Procedure.................................................................................................. 26
B. Control Board Check................................................................................................... 29
C. Thermistor Check........................................................................................................ 30
D. Diagnostic Chart ......................................................................................................... 31
V. Replacement of Components .......................................................................................... 33
A. Service for Refrigerant Lines....................................................................................... 33
1. Refrigerant Recovery ............................................................................................. 33
2. Brazing .................................................................................................................. 34
3. Evacuation and Recharge (R-134a) ...................................................................... 34
B. Important Notes for Component Replacement............................................................ 35
C. Door Reversal ............................................................................................................. 36
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VI. Cleaning and Maintenance Instructions ......................................................................... 37
A. Cleaning...................................................................................................................... 37
1. Exterior................................................................................................................... 37
2. Cabinet Interior...................................................................................................... 37
3. Door Gasket .......................................................................................................... 37
4. Shelves.................................................................................................................. 37
B. Maintenance................................................................................................................ 37
VII. Preparing the Appliance for Periods of Non-Use........................................................... 38
VIII. Disposal........................................................................................................................ 39
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Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.
WARNING
NOTICE
IMPORTANT
Indicates a hazardous situation which could result in death or
serious injury.
Indicates a situation which could result in damage to the
appliance or property.
Indicates important information about the use and care of the
appliance.
WARNING
This appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage.
To reduce the risk of death, electric shock, serious injury, or fire, follow basic
precautions including the following:
• Only qualified service technicians should install and service this appliance.
• This appliance must be installed in accordance with applicable national, state, and
local codes and regulations.
• This appliance requires an independent power supply of proper capacity. See
the nameplate for electrical specifications. Failure to use an independent power
supply of proper capacity can result in a tripped breaker, blown fuse, damage to
existing wiring, or component failure. This could lead to heat generation or fire.
• THIS APPLIANCE MUST BE GROUNDED. This appliance is equipped with a
NEMA 5-15 three-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 remove the ground prong from the power cord and do not use an
adapter plug.
• Do not use an extension cord.
• To reduce the risk of electric shock, turn off the appliance before unplugging.
• To reduce the risk of electric shock, do not touch the plug with damp hands.
• Do not use an appliance with a damaged power cord. The power cord should not
be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions
could result in electric shock or fire. To unplug the appliance, be sure to pull the
plug, not the cord, and do not jerk the cord.
• Do not make any alterations to the appliance. Alterations could result in electric
shock, injury, fire, or damage to the appliance.
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WARNING, continued
• This appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.
• Children should be properly supervised around this appliance.
• Do not climb, stand, or hang on the appliance or door or allow children or animals
to do so. Do not climb into the appliance or allow children or animals to do so.
Death or serious injury could occur or the appliance could be damaged.
• Be careful not to pinch fingers when opening and closing the door. Be careful
when opening and closing the door when children are in the area.
• Do not use combustible spray or place volatile or flammable substances near the
appliance. They might catch fire.
• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance
could cause harm to individuals or damage to the appliance.
NOTICE
• Protect the floor when moving the appliance to prevent damage to the floor.
• Keep ventilation openings, in the appliance enclosure or in the built-in structure,
clear of obstruction. Do not place anything on top of the appliance. Blockage of
airflow could negatively affect performance and damage the equipment.
• Do not tightly pack the cabinet. Allow some space between items to ensure good
air flow. Also allow space between items and interior surfaces.
• Do not store items near the air outlet. They might freeze up and crack or break.
• To prevent deformation or cracks, do not spray insecticide onto the plastic parts or
let them come into contact with oil.
• To avoid damage to the gasket, use only the door handle when opening and
closing.
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I. Specifications
A. Electrical and Refrigerant Data
See the nameplate for electrical and refrigerant data. The nameplate is located inside
the cabinet.
Electrical and Refrigerant Data
Design Pressure (PSIG) Refrigerant (oz.)
Model AC Supply Voltage Amperes
HR24A 115/60/1
HIGH
LOW
134a
4
360
120
2.80
We reserve the right to make changes in specifications and design without prior notice.
B. Storage Capacity and Dimensions
1. Storage Capacity
Storage Capacity
Interior Storage
Total Shelf
Model Capacity (ft3)
Space (ft2)
HR24A
3.67
2.26
We reserve the right to make changes in specifications and design without prior notice.
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2. Dimensions
Unit: mm [in.]
Top View
Front View
Side View
Additional Dimensions (mm [in.])
Model Interior Width Interior Height
HR24A 460 [18.11] 475 [18.70]
Interior Depth
Door Stay Open Position
450/330 [17.72/13.00]
616 [24.25]
We reserve the right to make changes in specifications and design without prior notice.
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II. General Information
A. Construction
1. HR24A
Display Module/Control Board
Door Switch
Door Lock
Door
• Evaporator Fan
• Evaporator
• Cabinet Thermistor
Wire Shelves
Door Gasket
• Evaporator Fan Shroud
Condenser
Compressor
Wire Harness
Condensate
Drain Line
Condensate Drain
Pan
Drier
Power Cord
Capillary Tube
Compressor
Start Relay
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B. Sequence of Operation
1. Sequence Cycles and Shutdown
The steps in the sequence are as outlined below. When power is supplied to CB,
DM LEDs flash 3 times, then °F LED turns on. Press the power button for 2 sec., the
cabinet temperature and EvapFM icon turn on and EvapFM starts. 2-min. Comp delay
timer starts. Comp icon flashes during the 2-min. Comp delay. When the 2-min. Comp
delay timer terminates, Comp icon turns steady and Comp starts.
Note: • EvapFM de-energizes when door is opened.
• There is a Comp delay of 2 min. at startup.
• There is a minimum Comp run time of 3 min.
• There is a Comp delay of 2 min. after a power interruption.
"+" Up "P" Set Power
Button Button Button
Cabinet Temperature LEDs "-" Down
Button
°
°F
Alarm Icon
Compressor Icon
°F LED
Defrost Icon
Evaporator Fan Motor Icon
a) Refrigerator
• The °F and CT LEDs remain on throughout the sequence of operation.
• This appliance uses a time-initiated/time-terminated Comp off cycle defrost. The factory
default defrost setting is once every 6 hours for 30 min.
• 6-hr. defrost timer starts the very first time CB is energized (factory testing). Defrost time
is cumulative power on time, therefore time may vary between starting the appliance
and the first defrost. After the first defrost, defrost can be monitored for activation every
6 hours.
• Cabinet temperature is displayed during defrost.
1. Startup
EvapFM icon is on and Comp icon is flashing. EvapFM energizes. 2-min. Comp delay
timer starts. Comp icon flashes until 2-min. Comp delay timer terminates.
2. Cool Down
EvapFM icon is on and Comp icon turns steady. EvapFM continues. 2-min. Comp
delay timer terminates. Comp energizes and 3-min. Comp run timer starts.
3. Cool Down Achieved
EvapFM icon is on. CTh cools to setpoint (default 39°F). EvapFM continues. If Comp run
time > 3-min., Comp icon turns off and Comp de-energizes. If Comp run time < 3-min.,
Comp continues until 3-min. Comp run timer terminates, then Comp icon turns off and
Comp de-energizes.
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4. Cool Down Restart
EvapFM and Comp icons are on. CTh warms to 4°F above setpoint. Comp icon turns
on and Comp energizes. 3-min. Comp run timer starts.
5. Defrost Initiation
EvapFM and Defrost icons are on.
a) Automatic Defrost Initiation: EvapFM and Defrost icons are on. EvapFM continues.
6-hr. DT terminates. 30-min. DT starts. If Comp run time < 3 min., Comp icon and
Comp continue until 3-min. Comp run timer terminates. Once 3-min. Comp run timer
terminates, Comp icon turns off, Comp de-energizes, and defrost starts.
b) Manual Defrost Initiation: EvapFM and Defrost icons are on. To initiate a manual
defrost, press and hold the "+" button until the defrost icon turns on. EvapFM
continues. 30-min. DT starts. If Comp run time < 3 min., Comp icon and Comp
continue until 3-min. Comp run timer terminates. Once 3-min. Comp run timer
terminates, Comp icon turns off, Comp de-energizes, and 30-min. DT starts.
Note: If the display module panel is locked, press and hold the "-" button and the power
button until "UnL" appears briefly on the display module.
6. Defrost Termination
Comp icon is on. EvapFM icon flashing. 30-min. DT terminates. 6-hr. DT starts. Comp
icon turns on and Comp energizes. 3-min. Comp run timer starts. 2-min. EvapFM timer
starts, EvapFM icon starts flashing, and EvapFM de-energizes. When 2-min. EvapFM
timer terminates, EvapFM icon turns steady and EvapFM energizes.
7. Energy Saving Mode
ESM initiates during periods of inactivity. Once CTh cools to setpoint, 20-min. ESM timer
starts. DS must remain engaged without activation (door open) for 20 min. after CTh
has achieved setpoint for ESM to initiate. Once 20-min. ESM timer terminates, EvapFM
operates on ESM cycle. See "EvapFM ESM Cycle" below.
Note: If DS is activated (door open) before 20-min. ESM timer terminates, ESM timer
resets and 20-min. ESM timer re-starts once CTh cools to setpoint again.
EvapFM ESM Cycle:
• If Comp is de-energized when 20-min. ESM timer terminates, EvapFM de-energizes.
• If Comp is energized when 20-min. ESM timer terminates, EvapFM continues and
cycles off with Comp.
• During ESM Comp off time, EvapFM operation is 1 min. on and 5 min. off. EvapFM
operates on and off with Comp.
Legend: CB–control board; Comp–compressor; CTh–cabinet thermistor; CT–cabinet
temperature; DM–display module; DS–door switch; DT–defrost timer; ESM–energy
saving mode; EvapFM–evaporator fan motor
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2. Sequence Flow Chart
e v s e t a p b o o i n t
C T h 4
F °
e v s e t a p b o o i n t
F ° o 4 m s a r t
C T h w
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C. Control Board and Display Module
• For factory default settings, see "II.H. Service Menu."
• For control board check procedure, see "IV.B. Control Board Check."
NOTICE
• The control board and display module are fragile; handle very carefully.
• The control board and display module contain integrated circuits, which are
susceptible to failure due to static discharge. It is especially important to touch
the metal part of the appliance before handling or replacing the control board and
display module .
• Do not touch the electronic devices on the control board and display module or
the back of the control board or display module.
• Do not change wiring and connections. Do not misconnect terminals.
• Do not short out power supply to test for voltage.
• Always replace the whole control board and display module assembly if it goes
bad.
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1. Control Board Layout
Control Board
Power Supply Input (115VAC)
Compressor (115VAC)
Ribbon Cable
Control Board
Cabinet Thermistor
E1
CONTROL BOARD
Door Switch (5VDC)
RIBBON CABLE
Evaporator Fan Motor
(12VDC)
E2
DISPLAY MODULE
Display Module
Display Module
Fig. 1
2. Display Module Layout
"+" Up "P" Set Power
Button Button Button
Cabinet Temperature LEDs "-" Down
Button
Display
°
°F
Alarm Icon
Compressor Icon
Defrost Icon
°F LED
Evaporator Fan Motor Icon
Fig. 2
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D. Cabinet Temperature
1. Default Settings
The default CT setpoint is 39°F. The default CT display scale setting is °F. NOTICE! Do
not change the CT display scale from °F to °C. All temperature related values in the
service menu must be changed manually if the CT display scale is changed from
°F to °C.
a) Adjusting the Temperature Setpoint
The CT setpoint is adjustable between 34°F and 52°F. Follow the directions below to
adjust the CT setpoint.
Note: If the display module panel is locked, press and hold the "-" button and the power
button until "UnL" appears briefly on the display module.
1) Press and hold the "P" button until Comp icon flashes on DM.
2) Press the "-" or "+" button until the desired value is displayed.
3) Press the "P" button to save the new CT setpoint and return to the CT display. If
no button is pressed for 15 sec. after selecting the new CT setpoint, DM returns to
CT display and the new CT setpoint is saved.
b) Manual Defrost
To initiate a manual defrost, press and hold the "+" button until the defrost icon turns on.
30-min. DT starts. If Comp run time < 3 min., Comp icon and Comp continue until 3-min.
Comp run timer terminates. Once 3-min. Comp run timer terminates, Comp icon turns
off, Comp de-energizes, and 30-min. DT starts. During defrost, the defrost icon stays on,
EvapFM runs normally, and CT is displayed. Defrost lasts for 30 min.
Legend: Comp–compressor; CT–cabinet temperature; DM–display module; DT–defrost
timer; EvapFM–evaporator fan motor
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E. Display Module Icons
Display module icons inform you of energized components and if the appliance is in
alarm.
Display Module Icons
Icon
Meaning
Compressor
Steady: Compressor running.
Flashing: • Compressor delay timer. Compressor starts within 2 min.
• While adjusting cabinet temperature setpoint. For cabinet temperature setpoint
adjustment, see "II.D Cabinet Temperature."
Defrost
Appliance is in defrost cycle. See "II.B.a)5. Defrost" for details.
Evaporator Fan Motor
Evaporator fan motor is running. Evaporator fan motor de-energizes when door is open.
During energy saving mode, evaporator fan motor cycles with compressor. When compressor is
de-energized, evaporator fan motor cycles 1 min. on and 5 min. off.
Alarm
Appliance is in alarm. See "II.G. Alarm Safeties" for details.
F. Control Panel Lockout
The control panel can be locked to help prevent the appliance from being turned off or
the setpoint from being changed inadvertently.
To lock the control panel, press and hold the "-" button and the power button until "Loc"
appears briefly on the display module.
To unlock the control panel, press and hold the "-" button and the power button until
"UnL" appears briefly on the display module.
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G. Alarm Safeties
The alarms are designed to protect the appliance and the items inside. These alarms
give information and warnings in the event the appliance is operating out of acceptable
parameters. For all alarms except Pr1, the alarm icon
alternates with the cabinet temperature. If the Pr1 alarm occurs, only Pr1 and the alarm
icon are displayed.
turns on and the alarm code
Alarm Signals
Corrective Action/Reset Details
Alarm Code Problem
High Temperature Alarm
If obvious corrections such as closing the door and
cleaning the condenser do not bring temperature
back in range, see "IV. Service Diagnosis."
Cabinet temperature has exceeded the
setpoint temperature by 10°F for more
than 2 hours.
AH
Automatically resets when temperature returns to
normal. Alarm icon flashes until reset manually.
Low Temperature Alarm
If obvious corrections do not bring the temperature
back in range, see "IV. Service Diagnosis."
AL
Cabinet temperature has remained below
the setpoint temperature by 10°F for more Automatically resets when temperature returns to
than 2 hours.
normal. Alarm icon flashes until reset manually.
Door Open
Close the door.
Ld
Cabinet Thermistor Malfunction Alarm
Compressor and evaporator fan motor cycle 10 min.
on, 10 min. off.
Pr1
Cabinet thermistor has failed.
a) High and Low Temperature Alarm Values (AH or AL)
If an AH or AL alarm occurs, follow the steps below to acquire alarm details.
1) Press the "-" button for 3 sec. to enter the alarm menu. "EnS" is displayed.
2) Press the "+" button once. "LS" is displayed.
3) Press the "P" button. The alarm code is displayed.
4) Press the "P" button again and the alarm details are displayed in 2 second increments.
AH or AL Alarm code
XX°F The highest or lowest temperature during the alarm
dur Alarm duration
h01 Hours alarm has been engaged
n15 Minutes alarm has been engaged (continuance of h01)
To review, press the "P" button again.
To exit, press the on/off button twice. After pressing the on/off button the first time, "LS"
is displayed. After pressing the on/off button the second time, the display returns to the
alarm code display.
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b) Clearing High and Low Temperature Alarms
To clear an alarm, follow the steps below.
1) Press the "-" button for 3 sec. to enter the alarm menu. "EnS" is displayed.
2) Press the "-" or "+" button twice. After pressing the "-" or "+" button the first time, "LS" is
displayed. After pressing the "-" or "+" button the second time, "rLS" is displayed.
3) Once "rLS" is displayed, press the "P" button.
4) Using the "-" or "+" button, set the display to "149."
5) Press the "P" button. The display flashes "----" for 4 sec. The alarm and display module
are now deleted and clear. The control board returns to normal operation.
Note: If the cabinet temperature is out of acceptable range, the procedures above
only change the alarm icon
from flashing to steady for 15 minutes. Once the
temperature is in acceptable range, the alarm clears from the display module and
deleted from memory.
H. Service Menu
The service menu chart is provided to give information on the operation parameters of
this appliance. NOTICE! Do not adjust. Adjustments outside of the factory default
settings could adversely affect safety, performance, component life, and warranty
coverage.
Note: If the display module panel is locked, press and hold the "-" button and the power
button until "UnL" appears briefly on the display module.
a) Service Menu Access
(1) Enter Service Menu
1. Make sure the appliance is plugged into the electrical outlet and power is on.
2. Press and hold the "-" and "+" buttons until "PA" is displayed.
3. Press the "P" button. "0" is displayed. Using the "-" button, set the display to "-19." This is
the service menu password.
(2) Service Menu List
4. Press the "P" button, "PA" is displayed. Press and hold the "-" and "+" buttons until "SP"
is displayed. "SP" is the first level of the service menu. "SP" is working setpoint.
5. To view the setting value, press the "P" button. To adjust the setting value, press the
"-" or "+" button. To return to the service menu list, press the "P" button. This saves the
new value and returns you to the service menu list.
6. Press the "-" or "+" button to scroll through the service menu list. Press the "P" button
to view the selected setting value. Press the "P" button again to save the changes and
return to the service menu list.
(3) Exit Service Menu
7. Press the "-" and "+" buttons for 4 sec. to exit the service menu or do not operate the
display for 60 sec. Display automatically switches back to normal operating mode and
saves changes after 60 sec. of inactivity.
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b) Service Menu Chart
Setpoint
Service Menu Min.
Max.
Unit
Factory Setting Description
SP
See r1 See r2 °C/°F 39°F
Cabinet setpoint.
(compressor off temperature).
(see r0 for compressor on temperature).
Thermistor Input (Do Not Adjust)
Service Menu Min.
Max.
25
Unit
Factory Setting Description
CA1
CA2
-25
-25
°C/°F
°C/°F
0
0
Cabinet thermistor temperature offset.
25
Evaporator thermistor temperature
offset.
P1
0
1
---
0
Decimal point for °C display: 0=no,
1=yes.
P2
P3
0
0
1
2
---
---
1
0
Temperature display scale: 0=°C, 1=°F
Evaporator thermistor:
0=not connected
1=defrost/evaporator fan
2=defrost
P8
0
250
ds
5
Temperature display delay.
Operation (Do Not Adjust)
Service Menu Min.
Max.
Unit
Factory Setting Description
r0
0
15
°C/°F
4°F
Temperature differential above
setpoint for the compressor to
turn on.
r1
r2
r3
r4
r5
r6
-99
r1
0
r2
99
1
°C/°F
°C/°F
---
34°F
52°F
0
Minimum cabinet setpoint.
Maximum cabinet setpoint.
Locked setpoint. 0=no, 1=yes
0
99
99
240
°C/°F
°C/°F
min.
0
Energy saving and overcooling
Do not adjust.
0
0
0
30
Compressor Protection (Do Not Adjust)
Service Menu Min.
Max.
Unit
Factory Setting Description
C0
0
240
min.
2
Compressor delay at startup
and after power interruption.
C1
0
240
min.
5
Minimum time between
compressor starts.
C2
C3
C4
0
0
0
240
240
240
min.
sec.
min.
3
Minimum compressor off time.
Minimum compressor run time.
180
10
Compressor off time with
defective cabinet thermistor.
C5
0
240
min.
10
Compressor on time with
defective cabinet thermistor.
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Defrost (Do Not Adjust)
Unit Factory Setting Description
Service Menu Min.
Max.
d0
0
99
hrs.
6
Defrost interval:
0=no defrost
d1
0
2
---
2
Defrost type. Do not adjust.
0=electric heater
1=hot gas
2=off cycle (evaporator fan motor)
d2
d3
d4
-99
0
99
99
1
°C/°F
min.
---
N/A
30
0
Limit for defrost if P3 = 1 or 2.
Defrost duration.
0
Defrost on startup. Do not adjust.
0=no, 1=yes
d5
d6
0
0
99
1
min.
---
0
0
Minimum time between startup and
defrost. Do not adjust.
Temperature display
during defrost. Do not adjust.
0=cabinet temperature
1=cabinet temperature or setpoint
+ differential (4°F). Based on
cabinet temperature at defrost
initiation.
d7
d8
0
0
15
3
min.
---
0
0
Drip time. Do not adjust.
Defrost initiation. Do not adjust.
0=d0 defrost timer is cumulative
power on time.
1=d0 defrost timer is cumulative
compressor run time.
2=defrost starts when
evaporator temperature < d9
for time d0.
3=based on evaporator temperature
when evaporator thermistor is
present.
d9
-99
0
99
99
°C/°F
°C/°F
---
32
27
0
Do not adjust.
Do not adjust.
Do not adjust.
Do not adjust.
Do not adjust.
Do not adjust.
d10
d11
d12
d13
d14
d15
0
1
0
99
min.
min.
min.
min.
30
1
1
240
240
99
0
30
0
0
Minimum compressor run time before
defrost if d1=1. Do not adjust.
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Temperature Alarm (Do Not Adjust)
Service Menu Min.
Max.
Unit
Factory Setting Description
A0
0
1
---
0
AL alarm sensor. Do not adjust.
0=cabinet thermistor
1=evaporator thermistor
A1
A2
-99
0
99
2
°C/°F
---
-10
1
Degrees below setpoint for AL alarm
when A2=1. Do not adjust.
AL alarm. Do not adjust.
0=deactivated
1=A1 relative to setpoint
(setpoint - A1)
2=absolute. AL occurs at
temperature A1.
A4
A5
-99
0
99
2
°C/°F
---
10
1
Degrees above setpoint for AH
alarm when A5=1. Do not adjust.
AH alarm. Do not adjust.
0=deactivated
1=A4 relative to setpoint
(setpoint + A4)
2=absolute. AH occurs at
temperature A4.
A6
A7
0
0
240
240
min.
min.
120
120
AH delay after startup.
Do not adjust.
Delay for AL or AH alarm to occur
after temperature is below A1 or
above A4.
Do not adjust.
A8
A9
0
0
240
240
15
min.
min.
15
15
4
AH delay after door switch closes.
Do not adjust.
AH delay after door switch opens. Do
not adjust.
A11
0.1
°C/°F
A1 and A4 temperature differential.
Do not adjust.
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Evaporator Fan Motor (Do Not Adjust)
Service Menu Min.
Max.
Unit
Factory Setting Description
F0
0
4
---
1
Fan operation with door closed.
Do not adjust.
0=off
1=on: see also F13, F14, and L10
2=parallel with compressor
3= dependent on F1
4=disabled when compressor is off,
dependent on F1 when
compressor is on.
F1
F2
-99
0
99
2
°C/°F
---
30
1
Fan off temperature when F0 set to
3 or 4. Do not adjust.
Fan operation during defrost:
Do not adjust.
0=disabled
1=enabled
2=dependent on F0
F3
F7
0
15
99
2
0
Maximum fan off time when defrost
thermistor used.
-99
°C/°F
Fan on temperature when defrost
thermistor used.
F8
F9
0.1
0
15
°C/°F
sec.
4
0
F1 differential.
240
Energy saving evaporator fan motor
delay after compressor shuts off.
F13
F14
0
0
240
240
min.
min.
5
1
Energy saving evaporator fan motor
off time.
Energy saving evaporator fan motor
on time.
Door Switch and Door Alarm (Do Not Adjust)
Service Menu Min.
Max.
Unit
Factory Setting Description
L0
0
5
---
2
Door switch function.
1=compressor and evaporator
fan motor de-energized
2=evaporator fan motor
de-energized
3-5=reserved
L1
0
1
---
0
Door switch operation.
0=normally open
1=normally closed
L2
L3
-1
-1
120
120
min.
min.
10
-1
Door alarm time delay.
-1=deactivated
Evaporator fan motor off time
when door is open.
-1=until door switch engaged
L4
0
0
1
---
0
Save door alarm.
0=no
1=yes
L10
999
min.
20
Energy saving activation.
After cabinet temperature
is reached and door switch
remains closed.
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Serial Network (Do Not Adjust)
Service Menu Min.
Max.
247
3
Unit
---
Factory Setting Description
LA
Lb
LP
1
0
0
247
2
Address (not used)
---
Baud Rate (not used)
Parity (not used)
2
---
2
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III.Technical Data
A. Refrigeration Circuit
Left Side
Perimeter
Liquid Line
Condenser
Drier
Condensate Pan
Evaporator
Capillary Tube
Evaporator
Fan Motor
Compressor
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B. Wiring Diagram
1. HR24A
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IV. Service Diagnosis
WARNING
• This appliance should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• Risk of electric shock. Use extreme caution and exercise safe electrical practices.
• Moving parts (e.g. fan blade) can crush and cut. Keep hands clear.
• Make sure all food zones are clean after the appliance is serviced. For cleaning
procedures, see "VI. A. Cleaning."
A. Diagnostic Procedure
The diagnostic procedure is basically a sequence check that allows you to diagnose the
electrical system and components. Before proceeding, check for correct installation and
proper voltage per appliance nameplate. When checking AC voltage (115VAC), always
choose a neutral (W wire) to establish a good neutral connection. If the control board is
in alarm, see "II.F Alarm Safeties." For further details, see "IV.B. Control Board Check."
• If the control panel is locked, press and hold the "-" button and the power button until
"UnL" appears briefly on the display module.
• The °F and cabinet temperature LEDs remain on throughout the sequence of operation.
• This appliance uses a time-initiated/time-terminated Comp off cycle defrost. The factory
default defrost setting is once every 6 hours for 30 min.
• 6-hr. defrost timer starts the very first time CB is energized (during factory testing).
Defrost time is cumulative power on time, therefore time may vary between starting
the appliance and the first defrost. After the first defrost, defrost can be monitored for
activation every 6 hours.
• Cabinet temperature is displayed during defrost.
1) Press and hold the power button for 2 sec. to turn off the appliance.
2) Unplug the appliance from the electrical outlet.
3) Remove the top panel. Secure the top panel to prevent it from falling over when
checking voltages and CB items.
4) Secure (tape) DS in the door closed position.
5) Plug the appliance back into the electrical outlet. °F LED turns on. Diagnosis: Confirm
that °F LED is on. If not, check CB POWER connector for 115VAC. If 115VAC is not
present, check power supply and power cord connection. If 115VAC is present and
°F LED is not on, replace CB.
6) Press the power button for 2 sec. to turn on the appliance.
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7) Startup–EvapFM icon is on and Comp icon is flashing. EvapFM energizes.
2-min. Comp delay timer starts. Comp icon flashes until 2-min. Comp delay timer
terminates. Diagnosis: Check that CT LEDs and EvapFM icon turn on. Next, check
that EvapFM energizes. If not, confirm that DS is engaged. Check across DS for 5VDC.
If 5VDC is not present, check DS activation lever and DS continuity. Note: DS contacts
are open when DS is engaged. If 5VDC is present, check CB EvapFM connector for
12VDC. If 12VDC is not present, replace CB. If 12VDC is present, check EvapFM wiring
connector for loose connection, EvapFM continuity, and fan blade for binding.
8) Cool Down–EvapFM icon is on and Comp icon turns steady. EvapFM continues.
2-min. Comp delay timer terminates. Comp energizes and 3-min. Comp run timer
starts. Diagnosis: Confirm CTh is at least 4°F above setpoint. Next, check that Comp
energizes. If not, check CB Comp connector for 115VAC. If 115VAC is not present,
confirm CTh status. See "IV.C. Thermistor Check." If CTh is in range and 115VAC is not
present, replace CB. If 115VAC is present, and Comp is off, check Comp wire harness
connections. Next check Comp external protector (integrated with start relay), Comp
start components, and Comp motor winding continuity. If Comp energizes and the
cabinet does not cool down, check for air leaks around the door (gasket), a restriction in
the refrigeration circuit, or refrigerant leak.
9) Cool Down Achieved–EvapFM icon is on. CTh cools to setpoint (default 39°F).
EvapFM continues. If Comp run time > 3-min., Comp icon turns off and Comp
de-energizes. If Comp run time < 3-min., Comp continues until 3-min. Comp run timer
terminates, then Comp icon turns off and Comp de-energizes. Diagnosis: If CTh is
in range and Comp does not de-energize, confirm Comp run time > 3 min. If Comp
continues after 3-min. Comp run timer terminates, replace CB.
10) Cool Down Restart–EvapFM icon is on. CTh warms to 4°F above setpoint (default
39°F). Comp icon turns on and Comp energizes. 3-min. Comp run timer starts.
Diagnosis: See step 8 above.
11) Defrost–EvapFM and Defrost icons are on. Cabinet Temperature is Displayed.
a) Automatic Defrost Initiation: 6-hr. DT terminates. 30-min. DT starts. EvapFM
continues. If Comp run time < 3 min., Comp icon and Comp continue until 3-min.
Comp run timer terminates. Once 3-min. Comp run timer terminates, Comp
icon turns off, Comp de-energizes, and defrost starts. Diagnosis: Has 6-hr. DT
terminated? If defrost icon is on, confirm that Comp de-energizes. If not, confirm
Comp run time > 3 min. If Comp continues after 3-min. Comp run timer terminates,
replace CB.
b) Manual Defrost Initiation: To initiate a manual defrost, press and hold the "+" button
until the defrost icon turns. 30-min. DT starts. EvapFM continues. If Comp run time
< 3 min., Comp icon and Comp continue until 3-min. Comp run timer terminates.
Once 3-min. Comp run timer terminates, Comp icon turns off, Comp de-energizes,
and defrost starts. Diagnosis: If defrost icon is on, confirm that Comp de-energizes.
If not, confirm Comp run time > 3 min. If Comp continues after 3-min. Comp run timer
terminates, replace CB.
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c) Defrost Termination: Comp icon is on. EvapFM icon flashing. 30-min. DT
terminates. 6-hr. DT starts. Comp icon turns on and Comp energizes. 2-min. EvapFM
timer starts. EvapFM icon starts flashing and EvapFM de-energizes. When 2-min.
EvapFM timer terminates, EvapFM icon turns steady and EvapFM energizes. Normal
operation resumes. Diagnosis: Has appliance been in defrost for 30 min.? If not,
allow 30-min. DT to terminate. Confirm CTh is 4°F above setpoint. After 30-min.
DT terminates, does Comp icon turn on and Comp energize? If not, replace CB. If
30-min. DT terminates and Comp icon turns on but Comp does not energize, check
CB Comp connector for 115VAC. If 115VAC is not present, replace CB. If 115VAC is
present, and Comp is off, check Comp wire harness connections, Comp external
protector (integrated with start relay), Comp start components, and Comp motor
winding continuity.
12) Energy Saving Mode
ESM initiates during periods of inactivity. Once CTh cools to setpoint, 20-min. ESM
timer starts. DS must remain engaged without activation (door open) for 20 min. after
CTh has achieved setpoint for ESM to initiate. Once 20-min. ESM timer terminates,
EvapFM operates on ESM cycle.
Diagnosis: Confirm 20-min. ESM timer terminates. Check that EvapFM cycles off with
Comp and operates 1 min. on and 5 min. off when Comp is de-energized. If not, replace
CB.
Legend: CB–control board; Comp–compressor; CT–cabinet temperature; DM–display
module; DS–door switch; DT–defrost timer; ESM–energy saving mode;
EvapFM–evaporator fan motor
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B. Control Board Check
Before replacing a CB that does not show a visible defect and that you suspect is bad,
always conduct the following check procedure. This procedure will help you verify your
diagnosis. Always choose a neutral (W wire) to establish a good neutral connection
when checking AC voltage (115VAC).
Startup and Cool Down:
1) Press the power button for 2 sec. to turn off the appliance.
2) Unplug the appliance from the electrical outlet.
3) Remove the top panel. Check all wiring connections. Confirm that the power cord,
EvapFM, Comp, DS, and CTh are all properly connected to CB and ground connection
(GND) is properly connected to the frame.
4) Secure the top panel to prevent it from falling over when checking voltages and
CB items.
5) Secure (tape) DS in the door closed position.
6) Plug the appliance back in. °F LED turns on. Diagnosis: Confirm that °F LED is on. If
not, check CB POWER connector for 115VAC. If 115VAC is not present, check power
supply and power cord connection. If 115VAC is present and °F LED is not on, replace
CB.
7) Press the power button for 2 sec. to turn on the appliance.
8) Check that CT LEDs and EvapFM icon turn on. If not, check for 115VAC at the POWER
connector on CB. If 115VAC is not present, check power cord and power supply.
If 115VAC is present, and DM is not on (°F and CT LEDs and EvapFM icon), replace
CB.
9) If °F and CT LEDs are on but EvapFM icon is not, confirm DS is engaged (pushed in,
contacts open). Check across DS for 5VDC. If 5VDC is not present, check DS activation
lever and DS continuity. Note: DS contacts are open when DS is engaged (door closed).
If 5VDC is present, check CB EvapFM connector for 12VDC. If 12VDC is not present,
replace CB. If 12VDC is present, check EvapFM wiring connector for loose connection,
EvapFM continuity, and fan blade for binding.
10) Defrost:
This appliance defrosts every 6 hrs. for 30 min. Defrost is an off-cycle defrost.
a) Manual Defrost Initiation: To initiate a manual defrost, press and hold the "+" button
until the defrost icon turns on. 30-min. DT starts. EvapFM continues. If Comp run
time < 3 min., Comp icon and Comp continue until 3-min. Comp run timer terminates.
Once 3-min. Comp run timer terminates, Comp icon turns off, Comp de-energizes,
and 30-min. DT starts. Diagnosis: If defrost icon is on, confirm that Comp
de-energizes. If not, confirm Comp run time > 3 min. If Comp continues after 3-min.
Comp run timer terminates, replace CB.
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b) Defrost Termination: Comp icon is on. EvapFM icon flashing. 30-min. DT terminates.
6-hr. DT starts. Comp icon turns on and Comp energizes. 2-min. EvapFM timer
starts. EvapFM icon starts flashing and EvapFM de-energizes. When 2-min. EvapFM
timer terminates, EvapFM icon turns steady and EvapFM energizes. Normal
operation resumes. Diagnosis: Has appliance been in defrost for 30 min.? If not,
allow 30-min. DT to terminate. Confirm CTh is 4°F above setpoint. After 30-min. DT
terminates, does Comp icon turns on and Comp energize? If not, replace CB.
Legend: CB–control board; Comp–compressor; CT–cabinet temperature; DM–display
module; DS–door switch; DT–defrost timer; EvapFM–evaporator fan motor
C.Thermistor Check
The cabinet thermistor is used for cabinet temperature control. Thermistor resistance
varies depending on temperature. The control board monitors the resistance to control
system operation. No adjustment is required. In the event the cabinet thermistor reading
is out of range (Pr1 alarm), the compressor operates on a fixed time basis of 10-min. on
and 10-min. off.
To check thermistor resistance, follow the steps below.
1) Press the power button for 2 sec. to turn the appliance off, then unplug the appliance.
2) Remove the evaporator shroud.
3) Disconnect and remove the evaporator thermistor.
4) Immerse the thermistor sensor portion in a glass containing ice and water for 2 to 3 min.
5) Check the resistance between the wires at the thermistor connector. Normal reading is
within 14.0 to 19.0 kΩ. If outside the normal reading, replace the thermistor.
6) Reconnect and replace the thermistor in its correct position.
7) Replace the evaporator shroud in its correct position.
8) Plug the appliance back in. Press the power button for 2 sec. to turn the appliance on.
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D. Diagnostic Chart
Before consulting the diagnostic charts, check the following:
• Check the cabinet temperature setpoint and factory default settings. For factory default
settings, see "II.D. Cabinet Temperature" and "II.H. Service Menu."
• Make sure the doors are not left open or opened too often and that they are sealing
properly.
• Make sure product is not blocking airflow and that the cabinet is not overloaded with
warm or hot product. Product should be allowed to cool before putting in the appliance.
• Check for correct installation and proper voltage per appliance nameplate. This
appliance is approved for indoor or outdoor use. Normal operating ambient temperature
should be within 61°F to 95°F (16°C to 35°C).
• The appliance should not be located next to ovens, grills, or other high heat producing
equipment or exposed to direct sunlight.
• The appliance must have a minimum of 1" (3 cm) clearance at bottom and top. Air must
be able to circulate freely under, behind, and above the appliance.
• Check the control board using the steps in "IV.B. Control Board Check."
1. Appliance Not Cooling
Appliance Not Cooling - Possible Cause
Power Supply
Unplugged, off, blown fuse, or tripped or defective breaker.
1.
a)
b)
c)
a)
b)
a)
b)
a)
b)
a)
Loose connection.
Not within specifications.
Loose connection.
Defective.
Cord and Plug
2.
3.
4.
5.
Wiring
Loose connection or open.
Faulty.
Power Button (control board)
Turned "OFF."
Defective.
Control Board and Display Module
See "II.G. Alarm Safeties."
and "IV.B. Control Board Check."
In alarm.
Defective.
b)
Door Switch
Door open.
6.
7.
a)
b)
a)
b)
a)
b)
c)
d)
a)
a)
a)
b)
Defective.
Evaporator Fan Motor
Compressor
Fan blade binding.
Defective.
Compressor external protector open or defective.
Motor winding open.
PTC relay contacts bad or coil winding open.
Inefficient.
8.
Condenser
Dirty.
9.
10.
11.
Evaporator
Dirty or frozen up.
Refrigerant/Refrigerant Lines
Gas leak, low charge.
Refrigerant lines restricted.
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2. Evaporator is Frozen Up
Evaporator is Frozen Up - Possible Cause
Evaporator
Dirty.
1.
2.
3.
4.
a)
a)
a)
a)
b)
Evaporator Fan Motor
Control Board
Defective.
Defective, not operating evaporator fan motor.
Gas leak, low charge.
Refrigerant lines restricted.
Refrigerant/Refrigerant Lines
3. Defrost Fails to Start or Terminate
Defrost Fails to Start or Terminate - Possible Cause
Control Board
Defective.
a)
1.
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V. Replacement of Components
WARNING
• This appliance should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• Press the power button for 2 sec. to turn off the appliance, then unplug the power
cord from the electrical outlet before servicing.
• Make sure all food zones in the appliance are clean after the appliance is
serviced. For cleaning procedures, see "VI.A. Cleaning."
A. Service for Refrigerant Lines
WARNING
• Repairs requiring the refrigeration circuit to be opened must be performed by
properly trained and EPA-certified service personnel.
• 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.
NOTICE
• Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
• Do not leave the system open for longer than 15 min. when replacing or servicing
parts. The Polyol Ester (POE) oils used in R-134a appliances can absorb
moisture quickly. Therefore it is important to prevent moisture from entering the
system when replacing or servicing parts.
• Always install a new drier every time the sealed refrigeration system is opened.
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.
• 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°C).
1. Refrigerant Recovery
No refrigerant access valves are provided on this appliance. Using proper refrigerant
practices, utilize a temporary tap-line valve on the high side to recover the refrigerant.
Store the refrigerant in an approved container. Do not discharge the refrigerant into the
atmosphere.
After recovery is complete, replace the tap-line valve with a proper, permanent access
valve.
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2. Brazing
WARNING
• R-134a itself is not flammable at atmospheric pressure and temperatures up to
212°F (100°C).
• R-134a itself is not explosive or poisonous. However, when exposed to high
temperatures (open flames), R-134a can be decomposed to form hydrofluoric
acid and carbonyl fluoride both of which are hazardous.
• Do not use silver alloy or copper alloy containing arsenic.
• 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.
1) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
NOTICE
• Always install a new drier every time the sealed refrigeration system is opened.
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.
• 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°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.
3. Evacuation and Recharge (R-134a)
1) Attach a vacuum pump to the system. Be sure the high-side charging hose is connected
to the field-installed high-side access valve.
IMPORTANT
The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils.
2) Turn on the vacuum pump, then open the high-side valve on the gauge manifold. Never
allow the oil in the vacuum pump to flow backwards.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.
4) Close the high-side valve on the gauge manifold.
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5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air from
the hose. See the nameplate for the required refrigerant charge. Hoshizaki recommends
only virgin refrigerant or reclaimed refrigerant which meets the requirements of ARI
Standard 700 (latest edition) be used.
6) A liquid charge is recommended when charging an R-134a system. Place the service
cylinder on the scales; if the service cylinder is not equipped with a dip tube, invert the
service cylinder, then place it on the scales. Open the high-side valve on the gauge
manifold.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) Close the high-side valve on the gauge manifold, then close the refrigerant access valve
(if applicable). Disconnect the gauge manifold hose.
9) Cap the access valve to prevent a possible leak.
B. Important Notes for Component Replacement
NOTICE
When replacing a component listed below, see the notes to help ensure proper
operation.
Component
Notes
Compressor
Install a new PTC relay. WARNING! To reduce the risk of electric shock, be sure to
reconnect the component's ground wire.
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C. Door Reversal
If you would like to reverse the door swing, follow the steps below.
1) Make sure the appliance is off and unplugged.
2) Remove the fasteners securing the top panel. See Fig. 1. Being careful not to pull on the
wires to the control panel and door switch, lift off the top panel. Secure the top panel so
that it does not interfere with the upper hinge or top panel bracket and will not fall.
3) While maintaining a hold on the door, remove the fasteners securing the upper hinge to
the right side of the appliance. Lift off the door and upper hinge.
4) Remove the top panel bracket from the left side of the appliance, then secure it to the
right side of the appliance.
5) Remove the 2 outside plastic plugs from the lower left side of the appliance.
6) Remove the lower hinge from the right side of the appliance, then secure it to the left
side of the appliance.
7) Place the 2 plastic plugs in the holes on the lower-right side of the appliance.
8) Remove the plastic plugs and the handle from the door.
9) Secure the handle to the right side of the door. Place the plugs in the open handle holes
on the left side of the door and in the hinge hole on the right side of the door.
10) Place the door onto the lower hinge, then place the upper hinge in the door and secure
to the left side of the appliance.
11) Make sure the door is level. If not, adjust the door using the slots in the hinges.
12) Check that the wiring is connected and routed properly, then replace the top panel in its
correct position. Secure the top panel.
Plastic Plugs
Top Panel
Top Panel Bracket
Upper Hinge
Control Panel
Handle
Door Switch
Lower Hinge
Fig. 1
Plastic Plugs
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VI. Cleaning and Maintenance Instructions
A. Cleaning
WARNING
• Before cleaning the appliance, turn off and unplug the appliance to prevent
electric shock by unexpected entrance of water into the appliance or injury by
moving parts.
• Before cleaning the appliance, move all items into another refrigerator.
• Do not splash water directly onto the appliance. This might cause short circuit,
electric shock, corrosion, or failure.
• Before using a sanitizer such as inert soap and sodium hypochlorite (chlorine
bleach), thoroughly read the manufacturer’s instructions on its proper usage.
IMPORTANT
• To prevent damage to the plastic surfaces, do not use the following: thinner,
benzine, alcohol, petroleum, soap powder, polishing powder, alkaline cleaner,
acid, scouring pad and especially those strong cleaners for use on a ventilating
fan or a cooking range. Also, to prevent corrosion, do not use sodium hypochlorite
(chlorine bleach) on the stainless steel surfaces.
• Use a clean cloth for cleaning.
1. Exterior
Wipe the exterior occasionally with a clean, soft cloth. Use a damp cloth containing a
neutral cleaner to wipe off oil or dirt buildup.
2. Cabinet Interior
Spills should be wiped up promptly to avoid unpleasant odors. The cabinet interior should
be cleaned periodically with a mild soap or detergent and warm water.
3. Door Gasket
Door gasket should be cleaned regularly with mild soap and warm water to remove dirt
and grease.
4. Shelves
Remove and clean regularly.
B. Maintenance
1. Condenser
Check the condenser once a year and use a brush or vacuum cleaner to clean the
condenser as required.
2. Power Supply Connection
If the plug or power cord is damaged, replace it. Be sure to connect the ground wire.
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VII. Preparing the Appliance for Periods of Non-Use
When shutting down the appliance for more than one week, follow the instructions
below.
WARNING
When preparing the appliance for long storage, prevent the door from closing
to reduce the risk of children getting trapped. Leave the shelves in place so that
children may not easily climb inside.
IMPORTANT
When preparing the appliance for long storage, clean the cabinet interior, door
gaskets, and shelves. See "VI.A. Cleaning" for details.
1) Before shutting down the appliance, move all items into another refrigerator.
2) Press and hold the power button for 2 sec. to turn off the appliance.
3) Unplug the appliance. WARNING! To reduce the risk of electric shock, do not touch
the plug with damp hands.
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VIII. Disposal
WARNING
When preparing the appliance for disposal, remove the door to reduce the risk of
children getting trapped. Leave the shelves in place so that children may not easily
climb inside.
This appliance contains refrigerant and must be disposed of in accordance with
applicable national, state, and local codes and regulations. Refrigerant must be
recovered by properly certified service personnel.
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