Optional Settings - Delfield Shelleymatic ACR-26S Service And Installation Manual

MCII Tempatrol ® Defrost Settings
Refrigerators
Refrigerators automatically defrost, using a special defrost
program in the MCII Tempatrol ® . A refrigerator will defrost
whenever the MCII Tempatrol detects poor unit efficiency.
A refrigerator defrost will rarely occur. However, under certain
conditions, a defrost may be needed to assure optimum per-
formance. Defrost cycles will occur more frequently at interior
temperature settings of 34°F (1°C) or less. Frequent defrosts
may also occur when room temperatures are unusually high.
Refrigerator defrosts cannot be adjusted; however, pressing
the RESET button will terminate the current defrost cycle on
either a refrigerator or a freezer.
Freezers
On freezers, an automatic (A) defrost cycle has been preset at
the factory; custom defrost cycles may be set by the user. The
last defrost program is always kept in the MCII Tempatrol's
memory, even if power is lost. Correct setting of the clock is
essential if a custom defrost cycle is set.
Custom defrost cycles
When programming the custom defrost cycles, the display will
offer a choice of A, 3, 4, 6 or 8. The following chart has guide-
lines on selecting the proper setting.
USAGE
DEFROST
LEVEL
SETTINGS
variable varies during the day
A
light 8 to 10 times per day
3
average about once per hour
4
heavy two or three times per hour
6
very heavy several times per hour
8
More defrosts should be added in high humidity environments.
Based on your selection, enter a time for the first defrost so that
it, and all subsequent defrosts, occur at suitable times.
MCII Tempatrol ® Optional Settings
Changing the temperature
The temperature display can read in degrees Fahrenheit
(default setting) or Celsius (International System). To change
scales, follow these steps:
1) Press the TIME and DOWN buttons simultaneous-
ly, then press the TEMP button.
2) Press the DEFROST button. The condensing unit
S T P E S
will shut off, and the display will read 000.
For customer service, call (800) 733-8829,
8
(800) 733-8821 or (517) 773-7981
FREQUENCY OF DEFROST
DOOR OPENINGS TIMING
automatic; as needed
every 8 hours
every 6 hours
every 4 hours
every 3 hours
Example
Matt's Diner wants to avoid defrost cycles during the peak
business hours around 7:00 a.m., noon and 5:00 p.m. The
freezer is used heavily during these periods, but the rest of the
day is "normal". The humidity in the diner is high, however.
Therefore, we estimate that four defrosts are needed each day,
and they will occur every six hours.
To avoid the 7:00 a.m. rush, the first defrost time will be set
at 8:00 a.m. in this example. Subsequent defrosts then occur
at 2:00 p.m., 8:00 p.m. and 2:00 a.m., thereby missing all the
rush periods.
The first defrost should be set to follow the period of heaviest
usage during the day.
For additional instructions on using the MCII Tempatrol to set
a custom defrost cycle, see page 8.
Automatic defrost cycles
If the automatic (A) or "demand" defrost mode is selected,
the MCII Tempatrol will monitor usage and efficiency of the
unit, and will then defrost automatically only when needed.
This setting is recommended for all applications when the
time of each defrost is not important. In automatic (A) mode,
it is possible for light duty units to operate for several days
without defrosting.
By eliminating unnecessary defrosting, significant energy sav-
ings can be realized, and fewer defrosts also lead to more con-
stant temperature control and longer product life.
The automatic defrost mode is not recommended when the
number of door openings per hour exceeds three.
For additional instructions on using the MCII Tempatrol to set
the automatic (A) defrost cycle, see page 8.
Manual defrost cycles
A manual defrost cycle can be initiated at any time by pressing
the DEFROST and TIME buttons simultaneously. The defrost
can be terminated by pressing RESET.
3) Hold the TIME button, and press UP or DOWN
until the display shows C for Celsius, or F for
Fahrenheit.
4) Release the TIME button. The display will blink to
indicate the command has been executed.
5) Press RESET. The condensing unit will restart, and
the display will return to the cabinet temperature,
now displayed in the new temperature scale.