Hoshizaki rf28a 補足マニュアル

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4) Press the 

 up or 

 down button to increase or decrease the - (minus) differential in 

.9°F increments.
Note: The - value can be adjusted between -0.9 and -6.3°F in .9°F increments (-0.5 to 

-3.5°C in .5°C increments).

5) Press the 

 service button to save the - (minus) setting. The - (minus) sign will turn off 

and the display will change to the + (plus) differential setting.

6) Press the MANUAL DEFROST button to return to the menu screen. Press and hold 

both the

 button and the 

 service button for 5 seconds to exit the setting mode 

and return to the temperature display.

This value should only be changed after consulting with the factory. To change the high 
temperature alarm delay time, follow the steps below.

1) Press and hold both the

 button and the 

 service button for 5 seconds. "F0" should 

appear in the display window. Press the MANUAL DEFROST button until "F3" appears 
in the display window.

2) Press the 

 service button to display the current setting (default: 2). Press the 

 up 

or 

 down button to increase or decrease the high temperature alarm delay time. 

Note: The time can be adjusted between 0 and 180 minutes in 60 minute increments. 

The display corresponds to time as follows:

0

60

120

180

3) Press the 

 service button to save the setting.

4) Press the MANUAL DEFROST button to return to the menu screen. Press and hold 

both the

 button and the 

 service button for 5 seconds to exit the setting mode 

and return to the temperature display.

This value should only be changed after consulting with the factory. To change the low 
temperature alarm delay time, follow the steps below.

1) Press and hold both the

 button and the 

 service button for 5 seconds. "F0" should 

appear in the display window. Press the MANUAL DEFROST button until "F4" appears 
in the display window.

2) Press the 

 service button to display the current setting (default: 1). Press the 

 up 

or 

 down button to increase or decrease the low temperature alarm delay time.