9
The Full Cycle function of the 37880 is designed to re-
move and recycle all refrigerant in an A/C system by
transferring the refrigerant to the storage tank, remove
moisture in the system by pulling a vacuum, and charg-
ing the system with a precise amount of refrigerant.
MODE 4 Operational Steps
NOTE: If desired, the gauges of the 37880 can now
be used to aid investigation of an A/C system prob-
lem. Ensure the automobile A/C system is turned
off prior to selecting a mode on the 37880.
1.
Verify the auto air conditioning system
is off.
2.
Select Full Cycle in the main menu. The LCD wi
ll
read “SELECT VACUUM TIME”
3. When the LCD reads “SET VACUUM TI
ME,”
set
the vacuum
time by entering the time using the nu-
meric keypad until the de
sired time is shown. Press
the ENTER key to continue.
4.
When the LCD reads “SET VAC HOLD TIME,”
set
the vacuum
hold time by entering the time using t
he
numeric keypad until the desired time is shown.
Press the ENTER key t
o
continue.
Note: We re
commend 10-15 minimum vacuum time
to ensure proper charging.
NOTE: Vacuum hold time can be bypassed if the
time is set to zero.
1.
When the LCD reads “SET CHARGE AMOUNT
,”
set the char
ge amount by entering the amount us-
ing the numeric keypad
until the desired time is
shown. Press the ENTER key to continue.
6.
When the LCD reads “INJECT OIL AFTER VAC-
UUM”,
use the left and right arrow keys to toggle
between YES and NO. Select YES or NO and
press the E
NTER key to
continue.
7.
The LCD should read
‘CONNECT SERVICE
HOS
ES TO VEHICLE
’,
8.
Press START KEY to begin full cycle operations.
9.
The unit will begin to recover as outlined for the Re-
covery Only cycle, and then evacuate the A/C sys-
tem and will beep to indicate the end of the vac-
uum time— if Vacuum Hold is used.
10.
Record the vacuum level shown on the low pres-
sure gauge and press START to begin the vacuum
hold time. The hold time will count down on the LCD
and the unit will beep at the end of the hold time. If
vacuum hold time was set to zero, the unit will
transition into charge mode.
11. Record the final vacuum level shown on the low
pressure ga
uge. If the two recorded levels are dif-
ferent, the A/C system may have a leak and may
not retain refrigerant when charged. The 37880 will
automatically start the charge cycle.
12.
The unit will prompt you to
“INJECT OIL NOW”
press and h
o
ld the START key until the desired
amount of oil is in
jected into the A/C system.
13.
The LCD will display the progress of t
he charging
process. Wh
en the desired charge am
ount has
been transferred to the A/C system, the unit will
beep.
14.
Verify the message on the LCD reads
“FULL
CYCLE COMPLET
E.”
15.
Press the RESET key.
The LCD should read
“CHECK OI
L LEVELS.” The LCD will read
“HOSES NEED CLEARING”
16.
Press the Enter Key. The unit will th
en prompt you
to “DISCON
NECT VEHICLE.”
17.
Shut the service valves and disconn
ect the high
and low side
auto service hoses from the auto.
18. Press the ENTER key; the LCD will read
“CLEARING HOSES.”
19.
Measure the oil in the oil drain bottle.
Dispose of
recovered oil in a proper
manner.
20.
Press the RESET key to return to the
“SELECT
MO
DE” status.
Model 37889 (Only) - The 37889 model has an inte-
grated micron gauge that can be used to determine the
micron level of the A/C System. The instructions below
will outline how to use this feature.
INTERGRATED MICRON GUAGE (37889 MODEL
ONLY) The 37889 model has an integrated micron
gauge that can be used to determine the micron level of
the A/C system. The instructions below will outline how
to use this feature .
Full Cycle / Vacuum operations– Select micron level by
using the up or down arrows. If you would rather enter
a time for the vacuum cycle press the START key. Use
the numeric keypad to set vacuum time. NOTE: Be-
cause of the location of the vacuum sensor it may be
necessary to set the micron lever lower to compensate
Note:
Since the micron sensor is inside the unit and not
attached to t
he vehicle there will be a difference in the
actual micron reading in the vehicle.
To achieve the best results set the micron number
lower than the micron level you want to reach.
FULL CYCLE
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