Freeze-Up Check List - Hoshizaki KM-420MWJ Service Manual

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J. Freeze-Up Check List
Please Complete When Diagnosing a Freeze-Up, Refrigerant Leak, or Low Charge
Model #___________________________ Serial # ______________________Install Date__________Freeze-Up Date___________
List model and manufacture of bin or dispenser__________________________.
Date appliance was last cleaned:__________.
Freeze-Up Defrost
YES
NO
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1) After defrosting, was the appliance leak
checked?
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2) Were any leaks found?
If so where?_____________________.
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3) Was any refrigerant added to the unit?
If so, how much?_________________.
Set Up
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4) Is the appliance stand alone?
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5) Is water line independent?
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6) Is water line correct size? If not________" .
3/8" Nominal ID Copper Water Tubing or
Equivalent.
7) What is water pressure?___________.
Water Temperature_________.
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8) Does appliance have any water filtration?
If yes please list the following:
Filter brand___________________.
Model________________.
Filter pressure gauge reading during the fill
cycle___________.
Date filter was last
replaced?__________________________.
GPM or LPM flow rate of filter
system?__________________.
9) Ambient temperature at appliance?
______________.
At remote condenser (if applicable)?________.
Appliance Status
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10) Is the appliance and/or float switch dirty?
11) List the S4 (1-10) and S5 (1-5) DIP switch
settings.
S4: 1___2___3___4___5___6___7___8___9___10____
S5: 1_____2_____3_____4_____5______
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12) Is DIP switch number 7 ON (harvest pump
time (harvest assist) all models
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13) Is the cube guide positioned correctly?
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14) Are the evaporator separators positioned
properly?
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15) Is the thermistor properly mounted, tight, and
insulated?
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16) Is the TXV bulb properly mounted, tight, and
insulated?
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17) Are splash guards in place?
Note: Make copies of this form and use it when diagnosing a freeze up condition. Submit a completed copy of the checklist
along with the freeze-up labor claim form.

Freeze-Up Check List

Technical Support Fax #: 770-487-3360
Make Copies And Use As Needed
Appliance Sequence of Operation
YES
[ ]
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1
51
Fill
NO
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18) Does the water tank fill and overflow?
60-90 sec. Note: Larger models may take up to
120 seconds to overflow when empty.
[ ]
19) If NO in step 18, is water flow 5GPM for larger?
Harvest
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20) Is the hot gas valve opening?
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21) Is harvest pump time (harvest assist) utilized (S4
dip switch 7)?
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22) Is hot gas valve opening in harvest?
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23) Does water valve close completely when
de -energized?
24) What was length of harvest?___________.
Freeze
[ ]
25) Is pump motor energized in freeze cycle except
during 10-sec. anti-slush. If activated (S5 dip
switch 5 on)?
26) Water-cooled condenser outlet temperature
5-min. into freeze? ______________°F.
27) What was length of freeze?____________.
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28) Is the cube size consistent from inlet to outlet of
evaporator?
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29) Is ice still dropping when next freeze cycle starts?
30) What is the ice drop weight?___________.
31) What is head pressure?
Freeze_________Harvest_______.
(Freeze pressure should be taken 5 minutes into
the freeze cycle).
32) What is suction pressure?
Freeze______Harvest_______.
(Freeze pressure should be taken 5 minutes into
the freeze cycle).
[ ]
33) When activating bin control, did appliance
shutdown within 15 seconds in the first 5 minutes
of freeze cycle?

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