Hussmann MAXI-140, Operator'S Manual

Set Defrost Time (Pass Code Needed)

• Press the SELECT button (top left button)
until you see 

dEFr

. 

• Then press the UP button twice to get to

StAr

and press SELECT.  

• Press the UP or DOWN button to change
minutes; press SELECT.  
• Press the UP or DOWN button to change
hours; press SELECT.  

The second defrost will follow 12 hours later. If
this change meets the needs of your business,
replace the Safe-NET cover and grille.

Change Standard Defrost Time

(Pass Code Required)

Your business may need defrost times that are
not evenly spaced, or staggered, such as 0300
(3:00 a.m.) and 1400 (2:00 p.m.) because your
business is open later. Or you may need more
than two defrosts due to peak sales or high
humidity—0300, 0900, 1500 and 2100 are 
evenly spaced, while 0300, 1000, 2100 are 
staggered defrost times. Safe-NET can handle 
2 or 3 staggered defrosts or 2 to 8 evenly
spaced defrosts in 24 hours.

NDEF

The 

ndEF

parameter sets the number of defrost

cycles in a 24-hour period. The number works
in conjunction with the 

StAr

parameter 

discussed above. The 

ndEF

(number of

defrosts) determines the number of defrosts
that occur in a 24-hour period beginning with
the 

StAr

(first defrost) parameter. The 

maximum number of defrosts allowed in a 
24-hour period is 8. The defrosts are spaced
evenly across the 24-hour period beginning
with the 

StAr

time. The formula for calculating

defrost start times is as follows:

Defrost interval = 24/

ndEF

First defrost cycle start time = 

StAr

Second start time = 

StAr

+ Interval

Third start time = 

StAr

+ 2 X Interval

~

Eighth start time = 

StAr

+ 7 X Interval

For example, with a 

StAr

value of 01:00 and

an 

ndEF

setting of 4, the defrost cycle start

times are:

1:00 

A

.

M

.

7:00 

A

.

M

.

1:00 

P

.

M

.

7:00 

P

.

M

.

This scheme applies to all types of defrosts.

Setting this parameter is done in the 

dEFr

menu. After navigating to the 

ndEF

submenu

item, the display will cycle between 

ndEF

and

the current setting. While the setting is being
displayed, press the SELECT button to edit
this value. When the Safe-NET display module
begins flashing the value, use the UP /DOWN
buttons to increase or decrease the value to the
desired setting.

©2007 HUSSMANN CORPORATION • BRIDGETON, MO  63044-2483 U.S.A.
U.S. & CANADA 1-800-504-4828 • WWW.CHILLCHAMBER.HUSSMANN.COM

8

P/N 31033596_B

01 June 2007

MAXI-140