Hoshizaki Refrigerator KML 250MAH User Manual

Hoshizaki America, Inc.  
Hoshizaki  
Low-Profile Modular Crescent Cuber  
Models  
KML-250MAH, MWH  
KML-351MAH, MWH  
KML-451MAH, MWH  
KML-631MAH, MWH, MRH  
INSTRUCTION MANUAL  
“A Superior Degree  
of Reliability”  
Issued: 8-19-2013  
 
IMPORTANT  
This manual should be read carefully before the appliance is installed and operated.  
Read the warnings and guidelines contained in this manual carefully as they  
provide essential information for the continued safe use and maintenance of the  
appliance. Retain this manual for any further reference that may be necessary.  
CONTENTS  
Important Safety Information ................................................................................................. 4  
I. Specifications...................................................................................................................... 6  
A. Electrical and Refrigerant Data ..................................................................................... 6  
1. KML-250M_H ........................................................................................................... 6  
2. KML-351M_H........................................................................................................... 6  
3. KML-451M_H........................................................................................................... 7  
4. KML-631M_H........................................................................................................... 7  
B. Dimensions/Connections .............................................................................................. 8  
1. Air-Cooled Models (MAH)......................................................................................... 8  
2. Water-Cooled Models (MWH).................................................................................. 9  
3. Remote Models (MRH).......................................................................................... 10  
4. Remote Condenser Unit URC-9F (use with KML-631MRH)...................................11  
II. Installation and Operating Instructions ............................................................................ 12  
A. Location ...................................................................................................................... 12  
B. Checks Before Installation........................................................................................... 12  
C. How to Remove Panels............................................................................................... 13  
D. Setup........................................................................................................................... 14  
E. Electrical Connection .................................................................................................. 16  
F. Water Supply and Drain Connections .......................................................................... 18  
1. Icemaker ................................................................................................................ 19  
2. Water-Cooled Condenser....................................................................................... 20  
a) KML-250/351/451MWH...................................................................................... 20  
b) KML-631MWH.................................................................................................... 22  
G. Installation of Remote Condenser Unit ....................................................................... 24  
1. Location ................................................................................................................. 24  
2. Checks Before Installation..................................................................................... 25  
3. Setup ..................................................................................................................... 25  
4. Line Set Size and Refrigerant Charge................................................................... 25  
5. Line Set Installation ............................................................................................... 26  
6. Electrical Connection............................................................................................. 29  
7. Stacking Remote Condenser Unit .......................................................................... 30  
H. Final Checklist............................................................................................................. 31  
I. Startup.......................................................................................................................... 32  
III. Maintenance ................................................................................................................... 33  
A. Maintenance Schedule................................................................................................ 33  
B. Cleaning and Sanitizing Instructions........................................................................... 34  
1. Cleaning Procedure................................................................................................ 34  
2. Sanitizing Procedure - Following Cleaning Procedure........................................... 35  
IV. Preparing the Icemaker for Periods of Non-Use ............................................................. 37  
V. Disposal........................................................................................................................... 39  
3
 
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 installation, use, and  
care of the appliance.  
WARNING  
The 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 install, operate, and  
maintain the appliance in accordance with this manual will adversely affect safety,  
performance, component life, and warranty coverage and may result in costly water  
damage.  
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 the appliance.  
• The appliance must be installed in accordance with applicable national, state, and  
local codes and regulations.  
• Electrical connection must be hard-wired and must meet national, state, and local  
electrical code requirements. Failure to meet these code requirements could result  
in death, electric shock, serious injury, re, or damage.  
• The icemaker 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.  
THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker  
could result in death or serious injury.  
To reduce the risk of electric shock, do not touch the control switch or service switch  
with damp hands.  
• Move the control switch to the "OFF" position and turn off the power supply before  
servicing. Lockout/Tagout to prevent the power supply from being turned back on  
inadvertently.  
• Do not make any alterations to the appliance. Alterations could result in electric  
shock, serious injury, re, or damage.  
• The 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.  
4
 
WARNING, continued  
• Children should be properly supervised around the appliance.  
• Do not climb, stand, or hang on the appliance or allow children or animals to do so.  
Serious injury could occur or the appliance could be damaged.  
• 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.  
Additional Warning for Remote Models  
THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and  
ground connection to the remote condenser unit are supplied from the icemaker.  
Failure to properly ground the remote condenser unit could result in death or  
serious injury.  
• Wire routing (conduit) and disconnect (if required) must meet national, state, and  
local electrical code requirements. Failure to meet these code requirements could  
result in death, electric shock, serious injury, re, or damage.  
NOTICE  
• Follow the water supply, drain connection, and maintenance instructions carefully to  
reduce the risk of costly water damage.  
• In areas where water damage is a concern, install in a contained area with a floor  
drain.  
• Install the icemaker in a location that stays above freezing. Normal operating  
ambient temperature must be within 45°F to 100°F (7°C to 38°C).  
• Do not leave the icemaker on during extended periods of non-use, extended  
absences, or in sub-freezing temperatures. To properly prepare the icemaker for  
these occasions, follow the instructions in "IV. Preparing the Icemaker for Periods of  
Non-Use."  
• Do not place objects on top of the appliance.  
• The dispenser unit/ice storage bin is for ice use only. Do not store anything else in  
the dispenser unit/ice storage bin.  
5
 
I. Specifications  
A. Electrical and Refrigerant Data  
The rating label and nameplate provide electrical and refrigerant data. The rating label  
can be seen by removing the front panel. The nameplate is located on the rear panel. For  
certification marks, see the nameplate.  
We reserve the right to make changes in specifications and design without prior notice.  
1. KML-250M_H  
Model Number  
AC Supply Voltage 115/60/1  
KML-250AH  
KML-250MWH  
115/60/1  
Compressor  
Pump  
Fan  
115V 7.0RLA 33.6LRA  
115V 6.7RLA 33.6LRA  
120V 0.5FLA 23W  
--- --- ---  
115-120V 0.2A  
20 AMPS  
120V 0.5FLA 23W  
115V 1.2FLA 25W  
115-120V 0.2A  
Other  
Maximum Fuse Size 20 AMPS  
Max. HACR Breaker 20 AMPS  
(USA Only)  
20 AMPS  
Max. Circuit Breaker 20 AMPS  
(Canada Only)  
20 AMPS  
20 AMPS  
Minimum Circuit  
Ampacity  
20 AMPS  
Design Pressure  
Refrigerant  
HI-467PSI LO-230PSI  
404A 1 LB. 2 OZ.  
HI-427PSI LO-230PSI  
404A 14.1 OZ.  
2. KML-351M_H  
Model Number  
AC Supply Voltage 115/60/1  
KML-351MAH  
KML-351MWH  
115/60/1  
Compressor  
Pump  
Fan  
115V 6.1RLA 50LRA  
115V 6.7RLA 33.6LRA  
120V 0.5FLA 23W  
--- --- ---  
115-120V 0.2A  
20 AMPS  
120V 0.5FLA 23W  
115V 0.85FLA 50W  
115-120V 0.2A  
Other  
Maximum Fuse Size 20 AMPS  
Max. HACR Breaker 20 AMPS  
(USA Only)  
20 AMPS  
Max. Circuit Breaker 20 AMPS  
(Canada Only)  
20 AMPS  
20 AMPS  
Minimum Circuit  
Ampacity  
20 AMPS  
Design Pressure  
Refrigerant  
HI-467PSI LO-230PSI  
404A 1 LB. 9.4 OZ.  
HI-427PSI LO-230PSI  
404A 1 LB. 1.6 OZ.  
6
 
3. KML-451M_H  
Model Number  
KML-451MAH  
KML-451MWH  
AC Supply Voltage 115/60/1  
115/60/1  
Compressor  
Pump  
Fan  
115-120V 7.9RLA 54.5LRA 115-120V 9.0RLA 70LRA  
120V 0.5FLA 23W  
120V 0.85FLA 50W  
115-120V 0.15A  
120V 0.5FLA 23W  
--- --- ---  
115-120V 0.15A  
20 AMPS  
Other  
Maximum Fuse Size 20 AMPS  
Max. HACR Breaker 20 AMPS  
(USA Only)  
20 AMPS  
Max. Circuit Breaker 20 AMPS  
(Canada Only)  
20 AMPS  
20 AMPS  
Minimum Circuit  
Ampacity  
20 AMPS  
Design Pressure  
Refrigerant  
HI-467PSI LO-230PSI  
404A 1 LB. 8.7 OZ.  
HI-427PSI LO-230PSI  
404A 15.2 OZ.  
4. KML-631M_H  
Model Number  
KML-631MAH  
KML-631MWH  
KML-631MRH  
AC Supply Voltage 208-230/60/1 (3 Wire with 208-230/60/1 (3 Wire with 208-230/60/1 (3 Wire with  
Neutral) Neutral) Neutral)  
208-230V 6.9RLA 46LRA 208-230V 6.8RLA 46LRA 208-230V 6.4RLA 46LRA  
Compressor  
Pump  
Fan  
120V 0.5FLA 23W  
120V 0.85FLA 50W  
115-120V 0.15A  
120V 0.5FLA 23W  
--- --- ---  
115-120V 0.15A  
20 AMPS  
120V 0.5FLA 23W  
120V 3A MAX (Fan in URC)  
115-120V 0.15A  
20 AMPS  
Other  
Maximum Fuse Size 20 AMPS  
Max. HACR Breaker 20 AMPS  
(USA Only)  
20 AMPS  
20 AMPS  
Max. Circuit Breaker 20 AMPS  
(Canada Only)  
20 AMPS  
20 AMPS  
20 AMPS  
20 AMPS  
Minimum Circuit  
Ampacity  
20 AMPS  
Design Pressure  
Refrigerant  
HI-467PSI LO-230PSI  
404A 2 LB. 10.3 OZ.  
HI-427PSI LO-230PSI  
404A 1 LB. 6.0 OZ.  
HI-467PSI LO-230PSI  
404A  
Total Refrigerant Charge with  
Hoshizaki Remote Condenser  
Unit URC-9F: 11 LB. 7.4 OZ.  
7
 
B. Dimensions/Connections  
Units: mm [in.]  
1. Air-Cooled Models (MAH)  
Rear  
Side  
Model Shown: KML-451MAH  
KML-250MAH KML-631MAH  
KML-351MAH  
KML-451MAH  
Model Shown: KML-451MAH  
Bottom  
A 559 [22]  
659 [26]  
B 515 [20-1/4]  
C 505 [19-7/8]  
615 [24-1/4]  
605 [23-7/8]  
Model Shown: KML-451MAH  
NOTICE  
• Allow 6" (15 cm) clearance at rear,  
sides, and top for proper air circulation  
and ease of maintenance and/or  
service should they be required.  
• The ice storage bin opening must  
match the bottom opening as in the  
illustration.  
8
 
2. Water-Cooled Models (MWH)  
Units: mm [in.]  
Rear  
Side  
KML-250/351/451/MWH  
Model Shown: KML-451MWH  
KML-250MWH KML-631MWH  
KML-351MWH  
KML-451MWH  
Model Shown: KML-451MWH  
A 559 [22]  
659 [26]  
Rear  
KML-631MWH  
B 515 [20-1/4]  
C 505 [19-7/8]  
D 403 [15-7/8]  
E 55 [2-1/8]  
615 [24-1/4]  
605 [23-7/8]  
504 [19-7/8]  
-
NOTICE  
• Allow 6" (15 cm) clearance at rear,  
sides, and top for proper air circulation  
and ease of maintenance and/or  
service should they be required.  
Model Shown: KML-631MWH  
Bottom  
• The ice storage bin opening must  
match the bottom opening as in the  
illustration.  
Model Shown: KML-451MWH  
9
 
3. Remote Models (MRH)  
Units: mm [in.]  
Rear  
Side  
Model Shown: KML-631MRH  
KML-631MRH  
A 659 [26]  
Model Shown: KML-631MRH  
Bottom  
B 615 [24-1/4]  
C 605 [23-7/8]  
D 448 [17-5/8]  
E 41 [1-5/8]  
F 63 [2-1/2]  
G 75 [3]  
Model Shown: KML-631MRH  
NOTICE  
• Allow 6" (15 cm) clearance at rear,  
sides, and top for proper air circulation  
and ease of maintenance and/or  
service should they be required.  
• The ice storage bin opening must  
match the bottom opening as in the  
illustration.  
10  
 
4. Remote Condenser Unit URC-9F (use with KML-631MRH)  
Units: mm [in.]  
NOTICE  
Allow 24" (61 cm) clearance at front  
and rear for proper air circulation and  
ease of maintenance and/or service  
Top  
should they be required.  
Rear  
URC-9F Heat of Rejection  
Icemaker  
Model  
AT 90°F (32°C)  
WT 70°F (21°C)  
KML-631MRH 10,300 BTU/hr  
11  
 
II. Installation and Operating Instructions  
WARNING  
• The appliance must be installed in accordance with applicable national, state, and  
local codes and regulations.  
• Failure to install, operate, and maintain the appliance in accordance with this  
manual will adversely affect safety, performance, component life, and warranty  
coverage and may result in costly water damage.  
CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews  
are securely in place after installation. Make sure that none have fallen into the  
dispenser unit/ice storage bin.  
A. Location  
NOTICE  
• The icemaker is not intended for outdoor use. Normal operating ambient  
temperature must be within 45°F to 100°F (7°C to 38°C); Normal operating  
water temperature must be within 45°F to 90°F (7°C to 32°C). Operation of the  
icemaker, for extended periods, outside of these normal temperature ranges may  
affect icemaker performance.  
• The icemaker will not work at sub-freezing temperatures. To prevent damage  
to the water supply line, drain the icemaker if the air temperature is going to go  
below 32°F (0°C). See "IV. Preparing the Icemaker for Periods of Non-Use."  
• The icemaker should not be located next to ovens, grills, or other high heat producing  
equipment.  
• Allow 6" (15 cm) clearance at rear, sides, and top for proper air circulation and ease of  
maintenance and/or service should they be required.  
• The location should provide a firm and level foundation for the appliance.  
B. Checks Before Installation  
• Visually inspect the exterior of the shipping container and immediately report any  
damage to the carrier. Upon opening the container, any concealed damage should also  
be immediately reported to the carrier.  
• Remove the shipping carton, tape, and packing material. If any are left in the appliance,  
it will not work properly.  
• See the nameplate on the rear panel, and check that your voltage supplied corresponds  
with the voltage specified on the nameplate.  
• Remove the panels to prevent damage when installing the appliance. See "II.C. How to  
Remove Panels."  
• Remove the package containing the accessories.  
• Remove the protective plastic film from the panels. If the appliance is exposed to the  
sun or to heat, remove the film after the appliance cools.  
12  
 
• Check that the refrigerant lines do not rub or touch lines or other surfaces, and that the  
fan blade (if applicable) turns freely.  
• Check that the compressor is snug on all mounting pads.  
• The icemaker can be installed on a dispenser unit or ice storage bin. The ice storage  
bins listed below are recommended.  
Model Number Bin Width  
Recommended Hoshizaki Ice Storage Bin  
KML-250M_H  
KML-351M_H  
KML-451M_H  
KML-631M_H  
30" or Wider B-500 Series  
For further options, contact your local Hoshizaki distributor.  
NOTICE! Remote model must be connected to an appropriate remote condenser  
unit.The remote condenser unit listed below is recommended. Connection to a  
different remote condenser unit will void the warranty unless Hoshizaki approves  
a different remote condenser unit for your specific application. For further  
details, contact your local Hoshizaki distributor.  
Model Number Recommended Hoshizaki Remote Condenser Unit  
KML-631MRH URC-9F  
C. How to Remove Panels  
See Fig. 1  
• Front Panel: Remove the screw. Lift up and towards you.  
Top Panel: Lift up at front slightly, push rearward, and lift off.  
• Right Side Panel: Remove the screw. Slide forward slightly and lift off.  
• Front Insulation Panel: Lift up slightly, and pull towards you.  
Top Insulation Panel: Lift off.  
Top Panel  
Top Insulation Panel  
Front Insulation Panel  
Right Side Panel  
Front  
Panel  
Screw  
Screw  
Fig. 1  
13  
 
D. Setup  
1. Dispenser Unit/Ice Storage Bin and Icemaker Setup  
WARNING  
The installer must ensure the dispenser unit/ice storage bin is compatible with  
the icemaker, and the dispenser unit/ice storage bin and icemaker are properly  
attached and secured.  
1a) Dispenser Unit: Follow the dispenser unit's setup procedure.  
1b) Ice Storage Bin: Unpack the ice storage bin and attach the 4 adjustable legs provided  
(bin accessory) to the bottom of the ice storage bin.  
2) Position the dispenser unit/ice storage bin in its permanent location.  
3) If required, install an adapter kit or top kit. Contact your local Hoshizaki distributor for  
recommendations.  
4) Level the dispenser unit/ice storage bin in both the left-to-right and front-to-rear  
directions. If using an ice storage bin, adjust the ice storage bin legs to level.  
5) Place the icemaker on top of the dispenser unit/ice storage bin.  
6a) Dispenser Unit: Follow the dispenser unit, adapter kit, or top kit instructions for  
securing the icemaker. If no instructions are available, secure the icemaker using the  
mounting brackets provided. Rotate the mounting brackets so that they fit flush to the  
dispenser unit. See Fig. 2a. Secure the mounting brackets to the icemaker with the bolts  
provided. Secure the mounting brackets to the dispenser unit with self-tapping screws  
(not provided). NOTICE! Use care to avoid damage to dispenser unit components  
when attaching the mounting brackets.  
6b) Ice Storage Bin: Follow the ice storage bin, adapter kit, or top kit instructions for  
securing the icemaker. If no instructions are available, secure the icemaker using the  
2 mounting brackets and the bolts provided. See Fig. 2b.  
Icemaker  
Icemaker  
Bolts  
Mounting  
Brackets  
Bolts  
Fig. 2b  
Fig. 2a  
Ice  
Storage  
Bin  
Dispenser  
Unit  
Mounting  
Brackets  
Self-Tapping  
Screws  
(Not Provided)  
14  
 
Intentionally Left Blank  
15  
 
E. Electrical Connection  
WARNING  
For All Models  
• Electrical connection must be hard-wired and must meet national, state, and local  
electrical code requirements. Failure to meet these code requirements could result  
in death, electric shock, serious injury, re, or damage.  
• The icemaker 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.  
THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker  
could result in death or serious injury.  
• Electrical connection must be made in accordance with the instructions on the  
"WARNING" tag, provided with the pig tail leads in the junction box. See Fig. 3.  
Additional Warnings for Remote Models  
THE REMOTE CONDENSER UNIT MUST BE GROUNDED. Power supply and  
ground wire to the remote condenser unit are supplied from the icemaker. See  
"II.G.6. Electrical Connection." Failure to properly ground the remote condenser  
unit could result in death or serious injury.  
To reduce the risk of electric shock, make all remote condenser unit connections  
before connecting the icemaker power supply.  
NOTICE  
On remote models, the appliance must have power for a minimum of 4 hours prior  
to startup to prevent compressor damage.  
• Usually an electrical permit and services of a licensed electrician are required.  
• The maximum allowable voltage variation is ±10 percent of the nameplate rating.  
• The white lead must be connected to the neutral conductor of the power source.  
NOTICE! Miswiring may result in severe damage to the icemaker.  
• The opening for the power supply connection is 7/8" DIA to fit a 1/2" trade size conduit.  
16  
 
KML-250M_H  
KML-351M_H  
KML-451M_H  
KML-631M_H  
WARNING  
ELECTRICAL CONNECTION  
THISꢀUNITꢀMUSTꢀBEꢀGROUNDED  
Failure to properly ground or wire  
this unit could result in death,  
serious injury, or severe damage  
to the icemaker. The white lead  
must be connected to the neutral  
conductor of the power source.  
See diagram below.  
115-120/60/1  
JUNCTIONꢀBOX  
L
BROWN  
N
WHITE  
Fig. 3  
17  
 
F. Water Supply and Drain Connections  
See Figs. 4 through 8  
WARNING  
Water supply and drain connections must be installed in accordance with applicable  
national, state, and local regulations.  
NOTICE  
• Normal operating water temperature should be within 45°F to 90°F (7°C to  
32°C). Operation of the appliance, for extended periods, outside of this normal  
temperature range may affect appliance performance.  
• Water supply pressure must be a minimum of 10 PSIG and a maximum of  
113 PSIG. If the pressure exceeds 113 PSIG, the use of a pressure reducing valve  
is required.  
To prevent damage to the appliance, do not operate the appliance when the water  
supply is off, or if the pressure is below 10 PSIG. Do not run the appliance until  
the proper water pressure is reached.  
• External filters, strainers, or softeners may be required depending on water quality.  
Contact your local Hoshizaki Certified Service Representative or local Hoshizaki  
distributor for recommendations.  
• A plumbing permit and services of a licensed plumber may be required in some areas.  
• The icemaker drain line, dispenser unit/ice storage bin drain line, and water-cooled  
condenser drain line (if applicable) must be run separately.  
• Drain lines must have 1/4" fall per foot (2 cm per 1 m) on horizontal runs to get a good  
flow. A vented tee connection is also required for proper flow.  
• Drain lines should not be piped directly to the sewer system. An air gap of a minimum of  
2 vertical inches (5 cm) should be between the end of the drain pipes from the icemaker,  
dispenser unit/ice storage bin, and water-cooled condenser (if applicable) and the floor  
drain.  
18  
 
1. Icemaker  
Icemaker Water Minimum Icemaker  
Icemaker Drain Minimum Icemaker  
Supply Inlet  
Water Supply Line Size Outlet Drain Line Size  
1/2" Female Pipe 1/4" Nominal ID  
Thread (FPT)  
3/4" Female Pipe 3/4" Nominal  
Copper Water Tubing or Thread (FPT)  
ID Hard Pipe or  
Equivalent  
Equivalent  
• An icemaker water supply line shut-off valve and drain valve must be installed.  
• Be sure there is sufficient extra water supply line and drain line for the appliance to be  
pulled out for service.  
Icemaker Water  
Supply Inlet  
1/2" FPT  
Remote Condenser  
Line Set Connections  
(Remote Model)  
Minimum 1/4" Nominal ID Copper  
Water Tubing or Equivalent  
Icemaker  
Shut-Off Valve  
Drain Valve  
Icemaker  
Drain Outlet  
3/4" FPT  
Ice  
Be sure there is sufficient  
Storage  
extra water supply line and  
drain line for the appliance  
to be pulled out for service.  
Bin  
Separate piping to approved  
drain. Leave a 2-inch (5-cm)  
vertical air gap between the  
end of each pipe and the  
drain.  
Vent Tube  
Minimum 3/4" Nominal ID  
Hard Pipe or Equivalent  
2-inch (5-cm) air gap  
Bin Drain Outlet  
3/4" FPT  
Floor  
Drain  
Fig. 4  
Air-Cooled and Remote Models  
Model Shown:  
KML-631MRH  
19  
 
2. Water-Cooled Condenser  
a) KML-250/351/451MWH  
(1) Connection to an Open Drain System  
Condenser Water Minimum Condenser  
Condenser Drain Minimum Condenser  
Outlet Drain Line Size  
3/8" Female Pipe 1/4" Nominal ID Hard Pipe  
Supply Inlet  
1/2" Female Pipe 1/4" Nominal ID Copper  
Thread (FPT)  
Water Supply Line Size  
Water Tubing or Equivalent Thread (FPT)  
or Equivalent  
• A condenser water supply line shut-off valve and drain valve must be installed.  
• In some areas, a back flow preventer may be required in the cooling water circuit.  
• In order to maintain the proper high side pressure, the condenser water supply inlet  
temperature should not drop below 45°F (7°C) and the condenser drain outlet temperature  
must be in the 104°F to 115°F (40°C to 46°C) range. Once the icemaker installation  
is complete, confirm the condenser drain outlet temperature 5 minutes after a freeze  
cycle starts. If the condenser drain outlet temperature is not in the proper range, use a  
flat blade screwdriver to rotate the adjustment screw on the water-regulating valve until  
the temperature is in the proper range (rotate counterclockwise to raise temperature or  
clockwise to lower temperature).  
Minimum 1/4" Nominal ID Copper  
Water Tubing or Equivalent  
Icemaker Water  
Supply Inlet  
Icemaker  
1/2" FPT  
Shut-Off Valve  
Condenser  
Drain Outlet  
3/8" FPT  
Condenser Water  
Supply Inlet  
1/2" FPT  
Drain Valve  
Vent Tube  
Ice  
Storage  
Bin  
Be sure there is sufficient  
extra water supply line and  
drain line for the appliance  
to be pulled out for service.  
Icemaker  
Drain Outlet  
3/4" FPT  
Minimum 1/4"  
Nominal ID  
Hard Pipe or  
Equivalent  
Separate piping to approved  
drain. Leave a 2-inch (5-cm)  
vertical air gap between the  
end of each pipe and the  
drain.  
Bin Drain Outlet  
3/4" FPT  
Vent Tube  
2-inch (5-cm) air gap  
Minimum 3/4" Nominal ID  
Hard Pipe or Equivalent  
Floor  
Drain  
Fig. 5  
Water-Cooled Models  
Connection to an Open Drain System  
Model Shown:  
KML-451MWH  
20  
 
(2) Connection to a Closed Loop System  
Condenser Water Minimum Condenser  
Condenser  
Return Outlet  
3/8" Female Pipe 1/4" Nominal ID Copper  
Minimum Condenser  
Return Line Size  
Supply Inlet  
1/2" Female Pipe 1/4" Nominal ID Copper  
Thread (FPT)  
Water Supply Line Size  
Water Tubing or Equivalent Thread (FPT)  
Water Tubing or Equivalent  
• Shut-off valves and drain valves must be installed at both the condenser water supply inlet  
and condenser return outlet.  
• Minimum water flow to the condenser is 4 GPM.  
• The pressure differential between the condenser water supply inlet and condenser return  
outlet must be no less than 10 PSIG.  
• When using a glycol blend, the solution mixture should be less than 30% glycol.  
• In order to maintain the proper high side pressure, the condenser water supply inlet  
temperature should not drop below 45°F (7°C) and the condenser return outlet  
temperature must be in the 104°F to 115°F (40°C to 46°C) range. Once the icemaker  
installation is complete, confirm the condenser return outlet temperature 5 minutes after a  
freeze cycle starts. If the condenser return outlet temperature is not in the proper range,  
use a flat blade screwdriver to rotate the adjustment screw on the water-regulating valve  
until the temperature is in the proper range (rotate counterclockwise to raise temperature  
or clockwise to lower temperature).  
Minimum 1/4" Nominal ID Copper  
Water Tubing or Equivalent  
Icemaker Water  
Supply Inlet  
Icemaker  
1/2" FPT  
Shut-Off Valve  
Condenser  
Return Outlet  
3/8" FPT  
Condenser Water  
Supply Inlet  
1/2" FPT  
Drain Valve  
Vent Tube  
Ice  
Storage  
Bin  
Be sure there is sufficient  
extra water supply line and  
drain line for the appliance  
to be pulled out for service.  
Icemaker  
Drain Outlet  
3/4" FPT  
Separate piping to approved  
drain. Leave a 2-inch (5-cm)  
vertical air gap between the  
end of each pipe and the  
drain.  
Bin Drain Outlet  
3/4" FPT  
Vent Tube  
2-inch (5-cm) air gap  
Minimum 3/4" Nominal ID  
Hard Pipe or Equivalent  
Fig. 6  
Water-Cooled Models  
Connection to a Closed Loop System  
Model Shown:  
KML-451MWH  
Floor  
Drain  
21  
 
b) KML-631MWH  
(1) Connection to an Open Drain System  
Condenser Water Minimum Condenser  
Condenser Drain Minimum Condenser  
Outlet Drain Line Size  
3/8" Female Pipe 1/4" Nominal ID Hard Pipe  
Supply Inlet  
1/2" Female Pipe 1/4" Nominal ID Copper  
Thread (FPT)  
Water Supply Line Size  
Water Tubing or Equivalent Thread (FPT)  
or Equivalent  
• A condenser water supply line shut-off valve and drain valve must be installed.  
• In some areas, a back flow preventer may be required in the cooling water circuit.  
• In order to maintain the proper high side pressure, the condenser water supply inlet  
temperature should not drop below 45°F (7°C) and the condenser drain outlet temperature  
must be in the 104°F to 115°F (40°C to 46°C) range. Once the icemaker installation  
is complete, confirm the condenser drain outlet temperature 5 minutes after a freeze  
cycle starts. If the condenser drain outlet temperature is not in the proper range, use a  
flat blade screwdriver to rotate the adjustment screw on the water-regulating valve until  
the temperature is in the proper range (rotate counterclockwise to raise temperature or  
clockwise to lower temperature).  
Minimum 1/4" Nominal ID Copper  
Water Tubing or Equivalent  
Icemaker Water  
Supply Inlet  
Icemaker  
1/2" FPT  
Shut-Off Valve  
Condenser  
Drain Outlet  
3/8" FPT  
Condenser Water  
Supply Inlet  
1/2" FPT  
Drain Valve  
Vent Tube  
Ice  
Storage  
Bin  
Icemaker  
Drain Outlet  
3/4" FPT  
Be sure there is sufficient  
extra water supply line and  
drain line for the appliance  
to be pulled out for service.  
Minimum 1/4"  
Nominal ID  
Hard Pipe or  
Equivalent  
Separate piping to approved  
drain. Leave a 2-inch (5-cm)  
vertical air gap between the  
end of each pipe and the  
drain.  
Bin Drain Outlet  
3/4" FPT  
Vent Tube  
2-inch (5-cm) air gap  
Minimum 3/4" Nominal ID  
Hard Pipe or Equivalent  
Floor  
Drain  
Fig. 7  
Water-Cooled Models  
Connection to an Open Drain System  
Model Shown:  
KML-631MWH  
22  
 
(2) Connection to a Closed Loop System  
Condenser Water Minimum Condenser  
Condenser  
Return Outlet  
3/8" Female Pipe 1/4" Nominal ID Copper  
Minimum Condenser  
Return Line Size  
Supply Inlet  
1/2" Female Pipe 1/4" Nominal ID Copper  
Thread (FPT)  
Water Supply Line Size  
Water Tubing or Equivalent Thread (FPT)  
Water Tubing or Equivalent  
• Shut-off valves and drain valves must be installed at both the condenser water supply inlet  
and condenser return outlet.  
• Minimum water flow to the condenser is 4 GPM.  
• The pressure differential between the condenser water supply inlet and condenser return  
outlet must be no less than 10 PSIG.  
• When using a glycol blend, the solution mixture should be less than 30% glycol.  
• In order to maintain the proper high side pressure, the condenser water supply inlet  
temperature should not drop below 45°F (7°C) and the condenser return outlet  
temperature must be in the 104°F to 115°F (40°C to 46°C) range. Once the icemaker  
installation is complete, confirm the condenser return outlet temperature 5 minutes after a  
freeze cycle starts. If the condenser return outlet temperature is not in the proper range,  
use a flat blade screwdriver to rotate the adjustment screw on the water-regulating valve  
until the temperature is in the proper range (rotate counterclockwise to raise temperature  
or clockwise to lower temperature).  
Minimum 1/4" Nominal ID Copper  
Water Tubing or Equivalent  
Icemaker Water  
Supply Inlet  
Icemaker  
1/2" FPT  
Shut-Off Valve  
Condenser  
Return Outlet  
3/8" FPT  
Condenser Water  
Supply Inlet  
1/2" FPT  
Drain Valve  
Vent Tube  
Ice  
Storage  
Bin  
Be sure there is sufficient  
extra water supply line and  
drain line for the appliance  
to be pulled out for service.  
Icemaker  
Drain Outlet  
3/4" FPT  
Separate piping to approved  
drain. Leave a 2-inch (5-cm)  
vertical air gap between the  
end of each pipe and the  
drain.  
Bin Drain Outlet  
3/4" FPT  
2-inch (5-cm) air gap  
Vent Tube  
Minimum 3/4" Nominal ID  
Hard Pipe or Equivalent  
Fig. 8  
Water-Cooled Models  
Connection to a Closed Loop System  
Model Shown:  
KML-631MWH  
Floor  
Drain  
23  
 
G. Installation of Remote Condenser Unit  
WARNING  
• Installation of remote condenser unit must be performed by properly trained and  
EPA-certified service personnel.  
• The remote condenser unit must be installed in accordance with applicable  
national, state, and local codes and regulations.  
• Failure to install the remote condenser unit within these guidelines may adversely  
affect safety, performance, component life, and warranty coverage.  
• Power supply and ground wire to the remote condenser unit are supplied from the  
icemaker. For details, see section "II.G.6. Electrical Connection."  
1. Location  
NOTICE  
• The remote condenser unit is intended for outdoor use. Normal operating ambient  
temperature should be within -20°F to +122°F (-29°C to +50°C). Operation of the  
remote condenser unit, for extended periods, outside of this normal temperature  
range may affect icemaker performance.  
• The maximum line length for the standard line sizes and refrigerant charge is  
66 feet (20 m). With larger line sizes and/or additional refrigerant, the maximum  
line length is 100 feet (30.5 m). For details, see "II.G.4 Line Set Size and  
Refrigerant Charge."  
• The maximum vertical distance between the remote condenser unit and the  
icemaker is 33 feet (10 m) above or 10 feet (3 m) below the icemaker. These  
distances are measured fitting to fitting. See Fig. 9.  
The remote condenser unit must be positioned in a permanent site under the following  
guidelines:  
• A firm and flat site.  
• A dry and well ventilated area with 24" (61 cm) clearance at front and rear for proper air  
circulation and ease of maintenance and/or service should they be required. See Fig. 10.  
Icemaker  
Remote  
Condenser  
Unit  
Min. 24" (61 cm) Clearance  
Max.  
33 Feet  
(10 m)  
Max.  
10 Feet  
(3 m)  
Air  
Air  
Icemaker  
Service Loop  
Fig. 10  
Remote  
Service Loop  
Condenser  
Unit  
Fig. 9  
24  
 
2. Checks Before Installation  
1) Remove the shipping carton, tape, and packing material.  
2) Check that the refrigerant lines do not rub or touch lines or other surfaces, and that the  
fan blade moves freely.  
3. Setup  
1) Assemble 2 sets of legs using the legs, bolts, and nuts provided. See Fig. 11.  
2) Position 1 of the plates provided between a set of legs and the remote condenser unit,  
then secure the legs to the remote condenser unit with the bolts and nuts provided.  
Repeat on the other side with the remaining set of legs.  
3) The bottom of each leg has a mounting hole. Secure the legs to the permanent site with  
4 bolts (not included).  
Bolt with Split Lock  
Washer and Flat Washer  
Nut  
Plate  
Fig. 11  
Nut  
Bolt with Split Lock  
Washer and Flat Washer  
Leg  
4. Line Set Size and Refrigerant Charge  
NOTICE  
The icemaker, line set, and remote condenser unit must contain the same type  
of refrigerant. Mixing of refrigerants will result in improper operation and possible  
damage to the refrigeration system.  
Line Set Size and Refrigerant Charge  
Line Set  
Line Set  
Up to 66 Feet (20 m)  
Greater than 66 Feet (20 m)  
Maximum 100 Feet (30.5 m)  
Hoshizaki  
Remote  
Hoshizaki  
Icemaker  
KML-631MRH URC-9F  
Condenser Liquid  
Charge  
Liquid  
Charge Adjustment  
(R-404A)  
Discharge  
Line  
1/2" OD  
Discharge  
Line  
1/2" OD  
Unit  
Line  
3/8"  
OD  
Adjustment Line  
Not 3/8"  
Applicable OD  
Add 0.4 oz. for each  
foot over 66 feet  
(40 g for each meter  
over 20 m). Write  
new total charge on  
icemaker's rating  
label.  
25  
 
5. Line Set Installation  
Precharged factory line sets, available as optional equipment from Hoshizaki America,  
are recommended. For details, see "II.G.5.a) Factory Line Set Installation." Field  
fabricated line sets are allowed. For details, see "II.G.5.b) Field Fabricated Line Set  
Installation."  
a) Factory Line Set Installation  
1) Route the factory line set (see "II.G.4 Line Set Size and Refrigerant Charge" for  
details) from the remote condenser unit to the icemaker. Leave a service loop behind  
the icemaker to allow the icemaker to be pulled out for service. See Fig. 12. Factory  
fabricated line sets are precharged and do not need to be evacuated. If the line set is  
too long or too short, see "II.G.5.a)(1) Factory Line Set Modification."  
NOTICE  
• Ensure that there are no traps and no kinks in the line set. The service loop is not  
considered an oil trap.  
• Do not coil extra line set.  
2) Connect the refrigerant lines to the appropriate male fittings on the remote condenser  
unit first and then at the icemaker. Make a proper connection as follows:  
a. Remove the protective covers from the male fitting and female coupling.  
b. Apply Polyol Ester (POE) refrigerant oil or Parker Super O Lube to the entire male  
fitting, including O-ring, diaphragm, and threads before making the connection.  
See Fig. 13. NOTICE! Do not use thread sealant on the fittings. Use POE  
refrigerant oil or Parker Super O Lube only.  
c. Make sure the male fitting and female coupling are properly aligned, then start the  
connection by hand to ensure that it is not cross threaded.  
d. Tighten the connection with a wrench until it is tight. At this point, the nut has  
covered most of the threads on the male fitting.  
e. Mark a reference line on the female coupling and the remote condenser unit or  
icemaker panel. Using a backup wrench on the back of the female coupling, tighten  
the six-sided nut of the female coupling an additional 1/6 turn. See Fig. 14.  
3) If you lengthened the line set as outlined in "II.G.5.a)(1) Factory Line Set Modification"  
and it exceeds 66 feet, see "II.G.4. Line Set Size and Refrigerant Charge" for proper  
charging of the appliance.  
(1) Factory Line Set Modification  
1) Recover the line set charge through the Schrader access ports on the Parker quick  
connect couplings and store it in an approved container. Do not discharge the  
refrigerant into the atmosphere. Remove the extra line set length or add extra tubing.  
When adding extra tubing, insulate the additional copper tubes separately.  
2) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace  
of refrigerant to the lines through the Schrader access ports on the Parker quick  
connect couplings (if using an electronic leak detector), and then raise the pressure  
using nitrogen gas (140 PSIG). WARNING! Do not use R-404A as a mixture with  
pressurized air for leak testing.  
26  
 
3) Evacuate through the Schrader access ports on the Parker quick connect couplings and  
charge with R-404A refrigerant vapor to a pressure of 15 to 30 PSIG. Go to step 2 in  
"II.G.5.a) Factory Line Set Installation."  
b) Field Fabricated Line Set Installation  
1) Route the copper tube liquid line and copper tube discharge line (see "II.G.4 Line  
Set Size and Refrigerant Charge" for details) from the remote condenser unit to the  
icemaker. Leave a service loop behind the icemaker to allow the icemaker to be pulled  
out for service. See Fig. 12.  
NOTICE  
• Ensure that there are no traps and no kinks in the line set. The service loop is not  
considered an oil trap.  
• Do not coil extra line set. Fabricate the line set to the proper length.  
2) Insulate the two copper tubes separately.  
3) Install Parker quick connect couplings on each end. OS-QUICK, a universal quick  
connect coupling kit available as optional equipment from Hoshizaki America, is  
recommended. NOTICE! Before brazing, remove the Schrader valve core from the  
access port. When brazing, protect the coupling by using a wet cloth to prevent  
the coupling from overheating. Do not use silver alloy or copper alloy containing  
arsenic.  
4) Allow the coupling to cool, then replace the Schrader valve core.  
5) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace  
of refrigerant to the lines through the Schrader access ports on the Parker quick  
connect couplings (if using an electronic leak detector), and then raise the pressure  
using nitrogen gas (140 PSIG). WARNING! Do not use R-404A as a mixture with  
pressurized air for leak testing.  
6) Evacuate through the Schrader access ports on the Parker quick connect couplings and  
charge with R-404A refrigerant vapor to a pressure of 15 to 30 PSIG.  
7) Connect the refrigerant lines to the appropriate male fittings on the remote condenser  
unit first and then at the icemaker. Make a proper connection as follows:  
a. Remove the protective covers from the male fitting and female coupling.  
b. Apply Polyol Ester (POE) refrigerant oil or Parker Super O Lube to the entire male  
fitting, including O-ring, diaphragm, and threads, before making the connection.  
See Fig. 13. NOTICE! Do not use thread sealant on the fittings. Use POE  
refrigerant oil or Parker Super O Lube only.  
c. Make sure the male fitting and female coupling are properly aligned, then start the  
connection by hand to ensure that it is not cross threaded.  
d. Tighten the connection with a wrench until it is tight. At this point, the nut has  
covered most of the threads on the male fitting.  
e. Mark a reference line on the female coupling and the remote condenser unit or  
icemaker panel. Using a backup wrench on the back of the female coupling, tighten  
the six-sided nut of the female coupling an additional 1/6 turn. See Fig. 14.  
8) If the line set exceeds 66 feet, see "II.G.4. Line Set Size and Refrigerant Charge" for  
proper charging of the appliance.  
27  
 
Remote Condenser Unit  
Icemaker  
Male Fitting  
Female Coupling  
Discharge Line (Insulated)  
See "II.G.4 Line Set Size and  
Refrigerant Charge" for details.  
Fig. 12  
Liquid Line (Insulated)  
See "II.G.4 Line Set Size and  
Refrigerant Charge" for details.  
Service Loop  
DO NOT USE  
THREAD SEALANT  
Male Fitting  
Brush  
Fig. 13  
Fig. 14  
Threads  
Apply POE Oil or  
Parker Super O Lube  
to Entire Male Fitting  
Diaphragm  
O-Ring  
Wrench  
1/6  
Turn  
Reference  
Line  
After Tight,Tighten an  
Additional 1/6 Turn  
Wrench  
Backup  
Wrench  
Backup  
Wrench  
28  
 
6. Electrical Connection  
WARNING  
• Electrical connection must meet national, state, and local electrical code  
requirements. Failure to meet these code requirements could result in death,  
electric shock, serious injury, re, or damage.  
To reduce the risk of electric shock, make all remote condenser unit connections  
before connecting the icemaker power supply.  
THE REMOTE CONDENSER UNIT MUST BE GROUNDED. Install a ground wire  
from the icemaker's fan motor junction box to the remote condenser unit's junction  
box. Use wire of an appropriate gage and outdoor rating. Failure to properly  
ground the remote condenser unit could result in death or serious injury.  
• Install line and neutral wires from the fan motor leads in the icemaker's fan motor  
junction box to the leads in the remote condenser unit's junction box. Use wire of  
an appropriate gage and outdoor rating.  
• Do not connect the fan motor leads in the icemaker to incoming power source. Do  
not connect the fan motor leads in the icemaker together. Do not allow the leads  
to contact the junction box walls.  
• Do not connect the remote condenser unit to an external power source.  
NOTICE  
On remote models, the icemaker must have power for a minimum of 4 hours prior  
to startup to prevent compressor damage.  
• Usually an electrical permit and services of a licensed electrician are required.  
• The opening for the power supply connection is 7/8" DIA to fit a 1/2" trade size conduit.  
1) Remove the remote condenser unit louver panel. See Fig. 15.  
2) Remove the icemaker fan motor junction box cover. Remove the remote condenser unit  
junction box cover.  
Remote Condenser Unit  
Icemaker  
Fan Motor Junction  
Box Cover  
Screws  
Junction Box  
Cover  
Louver Panel  
Fig. 15  
Screw  
29  
 
3) Install a ground wire from the icemaker fan motor junction box to the remote condenser  
unit junction box. Use wire of an appropriate gage and outdoor rating.  
4) Install line and neutral wires from the fan motor leads in the icemaker fan motor junction  
box to the leads in the remote condenser unit junction box. Use wire of an appropriate  
gage and outdoor rating.  
5) Replace the junction box covers and the louver panel in their correct positions.  
7. Stacking Remote Condenser Unit  
1) Install the lower remote condenser unit as described earlier in this section.  
2) Place the upper remote condenser unit on top of the lower. See Fig. 16.  
3) Secure the upper remote condenser unit to the lower remote condenser unit with the  
4 screws provided.  
4) Install refrigerant lines and make electrical connection as described earlier in this  
section.  
Upper Remote  
Condenser Unit  
Screws  
Screws  
Lower Remote  
Condenser Unit  
Fig. 16  
30  
 
H. Final Checklist  
WARNING  
CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews  
are securely in place after installation. Make sure that none have fallen into the  
dispenser unit/ice storage bin.  
1) Is the icemaker level?  
2) Is the icemaker in a site where the ambient temperature is within 45°F to 100°F (7°C to  
38°C) and the water temperature within 45°F to 90°F (7°C to 32°C) all year around?  
3) Is there at least 6" (15 cm) clearance at rear, sides, and top of the icemaker?  
4) Have the shipping carton, tape, and packing material been removed from the icemaker?  
Is the cube guide in the correct position?  
5) Have all electrical and water connections been made? Do electrical and water  
connections meet all national, state, and local code and regulation requirements?  
6) Has the power supply voltage been checked or tested against the nameplate rating?  
Has a proper ground been installed to the icemaker? On remote model, has a proper  
ground also been installed to the remote condenser unit?  
7) Are the water supply and drain lines sized as specified? Are the water supply line  
shut-off valve(s) and drain valve(s) installed? Has the water supply pressure been  
checked to ensure a minimum of 10 PSIG and a maximum of 113 PSIG?  
8) Have the refrigerant lines been checked to make sure they do not rub or touch other  
lines or surfaces? Has the fan blade (if applicable) been checked to make sure it turns  
freely?  
9) On remote model:  
• Is the line set sized as specified, insulated, tightened, and free of leaks and kinks?  
If the line set exceeds 66 feet (20 m), has the charge been adjusted as specified?  
• Has the icemaker power supply been on for a minimum of 4 hours?  
• Is the remote condenser unit in a site where the ambient temperature is within  
-20°F to +122°F (-29°C to +50°C) all year around?  
• Is there at least 24" (61 cm) clearance around the remote condenser unit?  
10) Are all components, fasteners, and thumbscrews securely in place?  
11) Has the end user been given the instruction manual, and instructed on how to operate  
the icemaker and the importance of the recommended periodic maintenance?  
12) Has the end user been given the contact information of an authorized service agent?  
13) Has the warranty card been filled out and forwarded to the factory for warranty  
registration?  
31  
 
I. Startup  
WARNING  
All parts are factory-adjusted. Improper adjustments may adversely affect safety,  
performance, component life, and warranty coverage.  
NOTICE  
• If the icemaker is turned off, wait for at least 3 minutes before restarting the  
icemaker to prevent damage to the compressor.  
To prevent damage to the water pump, do not leave the control switch in the  
"SERVICE" position for extended periods when the water tank is empty.  
• At startup, confirm that all internal and external connections are free of leaks.  
Additional Notice for Remote Models  
• The icemaker must have power for a minimum of 4 hours prior to startup to  
prevent compressor damage.  
1) Open the water supply line shut-off valve(s).  
2) Remove the front panel.  
3) Move the control switch on the control box to the "ICE" position.  
4) Replace the front panel in its correct position.  
5) Turn on the power supply, and allow the icemaker to operate for a total of 10 minutes.  
6) Remove the front panel, then move the service switch to the "DRAIN" position. Move  
the control switch to the "SERVICE" position.  
7) Replace the front panel in its correct position and allow the icemaker to drain for  
2 minutes.  
8) Turn off the power supply.  
9) Remove the front panel, then move the control switch to the "ICE" position.  
10) Replace the front panel in its correct position.  
11) Clean the dispenser unit/ice storage bin liner using a neutral cleaner. Rinse thoroughly  
after cleaning.  
12) Turn on the power supply to start the automatic icemaking process.  
13) When the icemaker is running, hold ice in contact with the bin control thermostat bulb.  
The icemaker should stop within 10 seconds. Adjustment may be needed, particularly at  
higher altitude locations.  
14) On water-cooled models, confirm proper condenser drain outlet/return outlet  
temperature as outlined in "II.F.2. Water-Cooled Condenser."  
32  
 
III. Maintenance  
The appliance must be maintained in accordance with the instruction manual and labels  
provided. Consult with your local Hoshizaki Certified Service Representative about  
maintenance service.  
WARNING  
• Only qualified service technicians should service the appliance.  
To reduce the risk of electric shock, do not touch the control switch or service switch  
with damp hands.  
• Move the control switch to the "OFF" position and turn off the power supply before  
servicing. Lockout/Tagout to prevent the power supply from being turned back on  
inadvertently.  
CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are  
securely in place after any maintenance is done to the appliance. Make sure that  
none have fallen into the dispenser unit/ice storage bin.  
A. Maintenance Schedule  
The maintenance schedule below is a guideline. More frequent maintenance may be  
required depending on water quality, the appliance's environment, and local sanitation  
regulations.  
Maintenance Schedule  
Frequency Area  
Daily Scoop  
Bi-Weekly Air Filters  
Monthly External Water  
Filters  
Task  
Clean the ice scoop using a neutral cleaner. Rinse thoroughly after cleaning.  
Inspect. Wash with warm water and neutral cleaner if dirty.  
Check for proper pressure and change if necessary.  
Icemaker Exterior Wipe down with a clean, soft cloth. Use a damp cloth containing a neutral  
cleaner to wipe off oil or dirt build up. Clean any chlorine staining (rust  
colored spots) using a non-abrasive cleanser.  
Underside of  
Icemaker and Top  
Kits; Bin Door and  
Snout  
Wipe down with a clean cloth and warm water.  
Yearly  
Icemaker and  
Clean and sanitize per the cleaning and sanitizing instructions provided in  
Dispenser Unit/Ice this manual. See "III.B. Cleaning and Sanitizing Instructions."  
Storage Bin  
Water Supply Inlet Close the icemaker water supply line shut-off valve and drain the water  
system. Clean the water supply inlet screen.  
Condenser  
Inspect. Clean if necessary by using a brush or vacuum cleaner. More  
frequent cleaning may be required depending on location.  
Water Hoses  
Inspect the water hoses and clean/replace if necessary.  
33  
 
B. Cleaning and Sanitizing Instructions  
The icemaker must be cleaned and sanitized at least once a year. More frequent  
cleaning and sanitizing may be required in some water conditions.  
WARNING  
To prevent injury to individuals and damage to the icemaker, do not use ammonia  
type cleaners.  
• Carefully follow any instructions provided with the bottles of cleaning and  
sanitizing solution.  
• Always wear liquid-proof gloves and goggles to prevent the cleaning and sanitizing  
solutions from coming into contact with skin or eyes.  
NOTICE  
To prevent damage to the water pump, do not leave the control switch in the  
"SERVICE" position for extended periods when the water tank is empty.  
1. Cleaning Procedure  
1) Dilute Hoshizaki "Scale Away" with warm water. Refer to the table.  
Model  
KML-451 and Smaller 10.5 fl. oz. (310 ml)  
KML-631 13.5 fl. oz. (400 ml)  
Scale Away  
Warm Water  
2 gal. (7.6 l)  
2.5 gal. (9.5 l)  
2) Remove all ice from the evaporator and the dispenser unit/ice storage bin.  
Note: To remove cubes on the evaporator, turn off the power supply and turn it back on  
after 3 minutes. The harvest cycle starts and the cubes will be removed from the  
evaporator.  
3) Turn off the power supply.  
4) Remove the front panel, then move the service switch to the "DRAIN" position. Move  
the control switch to the "SERVICE" position.  
5) Replace the front panel in its correct position, then turn on the power supply for  
2 minutes.  
6) Turn off the power supply.  
7) Remove the front panel, then remove the front insulation panel by lifting up the panel  
slightly and pulling it towards you.  
8) In bad or severe water conditions, clean the float switch assembly as described below.  
Otherwise, continue to step 9.  
a. Remove the 3 screws securing the float switch assembly, then remove the  
assembly.  
b. Remove the retainer rod from the bottom of the float switch housing, then remove  
the float. Be careful not to bend the retainer rod excessively when removing it.  
c. Wipe down the float switch housing, shaft, float, and retainer rod with cleaning  
solution. Rinse the parts thoroughly with clean water.  
d. Reassemble the float switch assembly and replace it in its correct position. Secure  
the float switch assembly with the screws.  
34  
 
9) Pour the cleaning solution into the water tank.  
10) Move the service switch to the "WASH" position.  
11) Replace the front insulation panel and the front panel in their correct positions.  
12) Turn on the power supply to start the washing process.  
13) Turn off the power supply after 30 minutes.  
14) Remove the front panel.  
15) Move the service switch to the "DRAIN" position.  
16) Replace the front panel in its correct position, then turn on the power supply for  
2 minutes.  
17) Turn off the power supply, then remove the front panel.  
18) Move the control switch to the "ICE" position.  
19) Replace the front panel in its correct position.  
20) Turn on the power supply to fill the water tank with water.  
21) Turn off the power supply after 3 minutes.  
22) Remove the front panel.  
23) Move the service switch to the "WASH" position, then move the control switch to the  
"SERVICE" position.  
24) Replace the front panel in its correct position.  
25) Turn on the power supply to rinse off the cleaning solution.  
26) Turn off the power supply after 5 minutes.  
27) Remove the front panel.  
28) Move the service switch to the "DRAIN" position.  
29) Replace the front panel in its correct position, then turn on the power supply for  
2 minutes.  
30) Turn off the power supply.  
31) Remove the front panel.  
32) Repeat steps 18 through 31 three more times to rinse thoroughly.  
Note: If you do not sanitize the icemaker, go to step 14 in "2. Sanitizing Procedure."  
2. Sanitizing Procedure - Following Cleaning Procedure  
1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with warm water. Refer to  
the table.  
5.25% Sodium Hypochlorite  
Model  
Warm Water  
Solution (Chlorine Bleach)  
KML-451 and Smaller 1.0 fl. oz. (30 ml)  
KML-631 1.25 fl. oz. (37 ml)  
2 gal. (7.6 l)  
2.5 gal. (9.5 l)  
2) Remove the front insulation panel.  
3) Pour the sanitizing solution into the water tank.  
35  
 
4) Move the service switch to the "WASH" position.  
5) Replace the front insulation panel and the front panel in their correct positions.  
6) Turn on the power supply to start the sanitizing process.  
7) Turn off the power supply after 15 minutes.  
8) Remove the front panel.  
9) Move the service switch to the "DRAIN" position.  
10) Replace the front panel in its correct position, then turn on the power supply for  
2 minutes.  
11) Turn off the power supply.  
12) Remove the front panel.  
13) Repeat steps 18 through 31 in "1. Cleaning Procedure" two times to rinse thoroughly.  
14) Move the control switch to the "ICE" position.  
15) Replace the front panel in its correct position.  
16) Clean the dispenser unit/ice storage bin liner using a neutral cleaner. Rinse thoroughly  
after cleaning.  
17) Turn on the power supply to start the automatic icemaking process.  
36  
 
IV. Preparing the Icemaker for Periods of Non-Use  
NOTICE  
• When storing the icemaker for an extended time or in sub-freezing temperatures,  
follow the instructions below to prevent damage.  
To prevent damage to the water pump, do not leave the control switch in the  
"SERVICE" position for extended periods when the water tank is empty.  
When the icemaker is not used for two or three days under normal conditions, it is  
sufficient to move the control switch to the "OFF" position. When storing the icemaker for  
an extended time or in sub-freezing temperatures, follow the instructions below.  
1. Remove the water from the icemaker water supply line:  
1) Turn off the power supply, then remove the front panel.  
2) Move the control switch to the "OFF" position.  
3) Close the icemaker water supply line shut-off valve, then open the icemaker water  
supply line drain valve.  
4) Allow the line to drain by gravity.  
5) Attach a compressed air or carbon dioxide supply to the icemaker water supply line  
drain valve.  
6) Move the control switch to the "ICE" position.  
7) Replace the front panel in its correct position, then turn on the power supply.  
8) Blow the icemaker water supply line out using the compressed air or carbon dioxide  
supply.  
9) Close the icemaker water supply line drain valve.  
2. Drain the water tank:  
1) Turn off the power supply, then remove the front panel.  
2) Move the service switch to the "DRAIN" position, then move the control switch to the  
"SERVICE" position.  
3) Replace the front panel in its correct position, then turn on the power supply for  
2 minutes.  
4) Turn off the power supply, then remove the front panel.  
5) Move the control switch to the "OFF" position.  
6) Replace the front panel in its correct position.  
7) Remove all ice from the dispenser unit/ice storage bin. Clean the dispenser unit/ice  
storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning.  
3. On water-cooled model, remove the water from the water-cooled condenser:  
1) Make sure the power supply is off, then remove the front, top, and right side panels.  
2) Close the condenser water supply line shut-off valve. If connected to a closed loop  
system, also close the condenser return line shut-off valve.  
37  
 
3) Open the condenser water supply line drain valve. If connected to a closed loop system,  
also open the condenser return line drain valve.  
4) Attach a compressed air or carbon dioxide supply to the condenser water supply line  
drain valve.  
5) Open the water regulating valve by using a screwdriver to pry up on the spring retainer  
underneath the spring. While holding the valve open, blow out the condenser using the  
compressed air or carbon dioxide supply until water stops coming out.  
6) Close the drain valve(s).  
7) Replace the right side, top, and front panels in their correct positions.  
38  
 
V. Disposal  
The 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.  
39  
 
HOSHIZAKI AMERICA, INC.  
618 Hwy. 74 S., Peachtree City, GA 30269 USA TEL (770) 487-2331 FAX (770) 487-3360 www.hoshizaki.com 1A3085-010  
 

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