Hoshizaki HUR40A(-D) - Manual (Page 27)

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a) Defrost Interval (F0)
This unit is preset at the factory to defrost once every 6 hours for general conditions.
However, if it is determined that this interval does not suit actual conditions, the interval
can be changed. To change the defrost interval, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
2) Press and hold both the button and the unmarked, blank button for 5 seconds.
If "F0" is not displayed, press the MANUAL DEFROST button until "F0" appears in the
display window.
3) Press the unmarked, blank button to display the current setting (default: "6"). Press
the up or down button to increase or decrease the number of hours between
each defrost. The interval can be from 1 to 12 hours in increments of 1 hour.
4) Press the unmarked, blank button to save the setting.
5) Press the MANUAL DEFROST button to return to the menu screen. Press and hold
both the button and the unmarked, blank button for 5 seconds to exit the setting
mode and return to the temperature display.
6) If a jumper was present between connector K151 pins 7 and 8 , reconnect it after all
setting and diagnostic work is complete.
Note:
• The defrost is a heated defrost, and therefore has a tendency to raise cabinet
temperature.
• When the unit goes into defrost during energy saving mode, evaporator fan(s)
and/or perimeter frame heaters will turn off.
• Cabinet temperature is not displayed during defrost; "dF" is displayed in its place.
• The change in the defrost setting will take effect immediately. The next defrost will
take place after the newly set time interval has elapsed.
• Initiating a manual defrost will restart the defrost timer.
• The evaporator temperature must be below the defrost completion temperature for
any defrost (manual or auto) to be initiated.
b) Defrost Termination Temperature (F1)
To change the defrost termination temperature, follow the steps below.
1) Make sure the jumper is removed between connector K151 pins 7 and 8 on the control
board. Otherwise you will not be able to access this setting. For details, see "D.1.
Gaining Access to Settings and Diagnostics."
2) Press and hold both the button and the unmarked, blank button for 5 seconds.
"F0" should appear in the display window. Press the MANUAL DEFROST button until
"F1" appears in the display window.