8
VACUUM cont.
Note: If the automobile A/C system has pressure on it,
the unit will automatically begin a recovery cycle to in-
sure that no refrigerant is released into the atmosphere.
10.
The 37880 SERIES will begin to evacuate the
A/C
system and will beep to i
ndicate the end of the vac-
uum time.
11.
Record the vacuum level shown on
the LCD and
press START to begin th
e vacuum hold time. The
hold time will count down on the LCD and the unit
will beep at the end of the hold time.
12. Record the final vacuum level shown on the LCD If
the two recorded vacuum levels are different, th
e
A/C system may have a leak and might not retain
refrigerant when charged.
13. 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.
14.
Verify the message on the LCD reads “VACUU
M
COMPLETE.”
15.
Press the RESET key to return to the main menu
.
16.
Shut the service valves and disconnect the high
and
low side aut
o service ho
ses from the automobile.
Model 37889
with integrated micron gauge (Only) -
See page 9 for instructions that will outline how to use
this feature.
CHARGE
The Charge Only function is designed to add a precise
amount of refrigerant when the A/C system is low on
refrigerant. This mode is most often used when the A/C
system is working but does not produce sufficiently cold
air. Note: THE A/C SYSTEM MUST BE IN A VACUUM
BEFORE THE CHARGING PROCESS.
MODE 3 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 CHARGE option from the main
menu.
3.
When the LCD reads “SET CHARGE AMOUNT
,”
set the amount of refrig
erant to be charged into t
he
A/C system by using the numeric keypad until the
desired amount is shown
.
press ENTER to set the
charge amount on the L
CD. NOTE:
To change
units from pounds and o
unces, ounces or kilogram
s
press the S
TART key. The unit will
then ask you to
confirm the charge amount. Press t
he ENTER ke
y
to confirm.
4.
The LCD will read “CONNECT SERVICE HOSE
S
TO THE VEHICLE ENT
ER TO CONTINUE”
. Press
the ENTER key
.
5.
Connect the high and low side auto
service hoses
to the respe
ctive high and low side
service ports on
the automobile A/C system. Open the service hose
valves.
6.
The LCD should read “PUSH START.”
7.
Press START key to begin charging
operations.
The display
will read “STABILIZING PLEASE WA
IT”
The 37880 Series will t
hen start the charge cycl
e.
The LCD will display the
charging process progress.
The unit will beep when the desired charge amount has
been transferred to the A/C system.
Note: The last 3 oz. of refrigerant charge will be me-
tered in by the charging solenoid. It is normal to hear a
clicking sound while charging.
8.
Verify the message on the LCD reads
“CHARGE
COMPLETE.” Press the
RESET key and the
Unit
will force a h
ose clearing routine. Close the servic
e
valves and disconnect t
he high and low side aut
o
service hoses from the auto.
9.
Press the ENTER key to return to the main me
nu
Low Side Charge
The system default setting is high-side charging. To
charge low-side, follow these steps:
1. Turn the unit off.
2.
Press and hold number 3 key down on the nu-
meric key keypad and turn the unit
on.
3.
When the display reads “low side charge,” releas
e
the charge key.
4. Enter the charge amount.
Note: when the unit is tu
rned off it will default back to
high-side charge.
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