Refrigeration Maintenance
129
9. Observe the micron gauge reading. The
vacuum rise should not exceed 2000 microns
in 5 minutes.
10. If the rise is above 2000 microns in 5 minutes,
check all hoses and connections for leaks.
Hoses with moisture present will require
additional evacuation time to achieve
satisfactory results.
NOTE: Dirty vacuum pump oil or a defective
vacuum pump will prevent a low micron
reading. Hoses and fittings can be isolated
individually to identify leaks.
Using The Evacuation Mode Menu
Evacuation Mode opens the system by energizing
all normally closed refrigeration valves. This
allows the entire refrigeration system to be
evacuated.
Evacuation mode is only used with the unit off.
Since a number of refrigeration valves must be
energized for an extended period of time, the
operator is prompted to connect a battery charger
to the unit battery. This maintains the unit battery
in a charged condition and insures ample voltage
to hold all refrigeration valves in the open
position during the evacuation process.
Start at the Standard Display and press the MENU
key.
Figure 153: Press Menu Key
The Maintenance Menu is accessed from the first
Operator Menu screen that appears; either the
Language Display or the Alarms Display. The
Alarms Display is shown here. Press and hold
both the unlabeled soft key and the Exit key for 5
seconds.
Figure 154: Press and Hold Exit and Unlabeled Key
The Maintenance Hourmeter Menu will appear.
Press the NEXT key as required to show the
Evacuation Mode
Menu. When the Evacuation Mode Menu is
shown press the SELECT key.
Figure 155: Evacuation Mode Menu
The display will indicate that the Evacuation
Mode is being programmed.
Figure 156: Programming
The operator is prompted to connect a battery
charger capable of 20 amps to the unit battery.
This maintains the unit battery in a charged
condition and insures ample voltage to hold all
refrigeration valves in the open position during
the evacuation process.
Figure 157: Connect Battery
WARNING: Do not set battery charger to
the “crank” or “start” position, otherwise
the HMI display will be damaged.
CAUTION: Disconnect the drain heaters
from the terminal strips in the remote
evaporators while the unit is connected to
a battery charger and being evacuated. It
is possible that the battery charger will
supply voltage that is high enough to
damage the drain heaters.
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