yellow jacket 3788 Series User manual

Operation Manual
37837 / 37880 / 37881 / 37882 / 37887 / 37888 / 37889
3788X Series (includes 37837)
P/N 380539 RevF

2
Refrigerants: All Models: R-134a
Compressor: 2-1/2 HP Hermetic Compressors
Power Source: 120V AC 60Hz for US Models 230V AC 50Hz for CE Models
Amperage: RLA: 8.5 RLA:
FLA: 11.0 FLA:
LRA: 30.0 LRA: 19.0
Size: 37880
Height: 45 inches
Width: 19.5 inches
Depth: 29 inches
Weight: Maximum is deluxe unit at 225 lb. with tank
Before operating this unit, please read this
manual thoroughly. You must understand the
procedures outlined in this manual. Failure to
follow these procedures could void all war-
ranties.
Before handling refrigerants, read the material
safety data sheet (MSDS) from the refrigerant
manufacturer.
Inhalation of high concentration of refriger-
ant vapors is harmful and may cause heart
irregularities, unconsciousness, or death.
Deliberate inhalation of refrigerants is ex-
tremely dangerous. Death can occur without
warning. Vapors reduce oxygen available
for breathing and are heavier than air. De-
composition products are hazardous. Liquid
contact can cause frostbite. All refrigerant
containers, equipment, and hoses are under
pressure.
3788X Series Refrigerant Management System
Section Page Section Page
Specifications 2 OPTION 6: Tank Refill 10
Safety Instructions 3 OPTION 7: Refrigerant Management System 11
Component Diagram 4 Purging Non-Condensable Gases 12
Control Panel Overview 5 Maintenance Reminders 12
Setup/Check List/User Op-
tions
6 Filter change/compressor oil/vacuum oil 13
Option 1: Recovery Only 6 Troubleshooting Information 14
OPTION 2: Vacuum 7 Common Problems 14
OPTION 3: Charge Only 8 LCD Error Messages 15
OPTION 4: Full Cycle 9 Repair Parts List 16
OPTION 5: Oil Inject 10 Warranty Information 16
Table of Contents
Specifications

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Know your equipment. Read and understand the oper-
ation manual and labels affixed to the unit. Learn it’s
application and limitations as well as the specific po-
tential hazards of your equipment.
ALWAYS WEAR SAFETY GOGGLES.
Ground all equipment. This unit is equipped with an
approved 3 prong grounding-type plug. The green
ground wire should never be connected to a live ter-
minal.
Use the Proper Extension Cords. Use the following
guide for choosing the proper extension cord:
Wire Maximum Length
18 Ga. - 10 feet 16 Ga. - 25 feet
14 Ga. - 50 feet 12 Ga. - 100 feet
Avoid Dangerous Environments. Do not use this unit
in damp locations or expose it to rain. This equipment
should be used in a location with mechanical ventila-
tion that provides at least four air changes per hour.
This equipment should not be used near open con-
tainers of flammable liquids.
Disconnect Unit from Power Supply Before Servicing.
An electrical shock hazard is present when the unit is
disassembled or the cowling is removed.
Repair Damaged Parts. Do not operate the unit with a
defective part. Repair unit to proper operating condi-
tions.
Use Recommended Accessories. Follow instructions
that accompany all accessories. Improper use of ac-
cessories may damage equipment or create a hazard.
Use Caution When Connecting or Disconnecting.
Improper usage may result in refrigerant burns
(frostbite). If a major refrigerant leak occurs, proceed
immediately to a well ventilated area. The hoses in-
cluded with this unit are supplied with couplers that,
when closed, prevent refrigerant vapors from venting
when disconnecting from the automobile.
Only Use the 37880 with the Correct Refrigerants.
The 37880 Series is only approved for R-134a
Operate the Unit within the Design Environment. The
37880 was designed to operate in a temperature range
from 40°F to 120°F. The unit should also not be
operated in a wet location.
WARNING! Refrigerant, in liquid and vapor form, is
a potentially hazardous material. Please consult the
manufacturer’s Material Safety Data Sheet for
additional information and adhere to the following
safety guidelines:
Avoid breathing high concentrations of vapors.
Use with sufficient ventilation to keep operator
exposure below recommended limits, especially in
enclosed and low lying areas.
Avoid contact of liquid refrigerant with the eyes
and prolonged skin exposure.
Wear goggles and protective gloves.
Do not attempt to operate this unit above 120°F
ambient temperature.
Do not allow refrigerants to contact open flame.
Refrigerant decomposition in a flame results in
phosgene gas. Breathing phosgene gas can be
fatal.
FIRST AID: If high concentrations of refrigerant are
inhaled, immediately remove the victim to fresh air.
Call a physician or emergency medical technician.
Keep calm. If not breathing, give artificial respiration.
If breathing is difficult, give oxygen. Do not give
epinephrine or similar drugs.
EYE: In case of liquid contact, immediately flush
eyes with plenty of water. Call a physician.
SKIN: Flush with water. Treat for frostbite, if
necessary, by gently warming the effected area.
CAUTION! All refrigerant hoses, recovery tanks,
refrigerant lines, the 37880, and other vessels
containing refrigerants should be handled as if under
high pressure.
CAUTION! Should be operated by certified personnel.
CAUTION! Avoid breathing A/C refrigerant and lubri-
cant vapor or mist. Exposure may irritate eyes, nose
and throat. To remove HFC-134a from the A/C system,
use service equipment certified to meet the require-
ments of SAE J2788. Additional health and safety
information may be obtained from refrigerant and
lubricant manufacturers.
CAUTION! Do not pressure test or leak test HFC-134a
service equipment and/or vehicle air conditioning
systems with compressed air. Some mixtures of air
and HFC-134a have been shown to be combustible at
elevated pressures. These mixtures, if ignited, may
cause injury or property damage. Additional health
and safety information may be obtained from refriger-
ant and lubricant manufacturers.
General Safety Instructions

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Component Location and Description
1. Touch Pad (Control Panel)
2. High Gauge
3. Low Gauge
4. Auto High Side Hose (Red)
5. Auto Low Side Hose (Blue)
6. Tank Vapor Hose (Red)
7. Tank Liquid Hose (Blue)
8. Oil Drain Bottle
9. Oil Inject Bottle (excluded on 37837,
37887 and 37888)
10. Tool Tray
11. Main Power Switch
12. Storage Tank
13. Vacuum Pump
11.
4.
1.
2.
8.
5.
9.
3.
10.
7.
6.
13.
12.

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LCD Display
The Liquid Crystal Display (LCD) display provides
the unit operator with continual updates of the
status. In addition, the display will prompt the
technician for the user input needed to continue
operation. The LCD shows error codes for rapid
diagnosis of abnormal conditions.
The display is divided into five fields which aid the
technician in rapidly reading information.
1. Weight - Shows the weight of refrigerant being
processed in each mode.
2. Time (MINS) - Shows the time set for Vacuum.
Timer will count down to display the time left.
3. Purge–Located in the bottom right corner of
display. A “Y” in this field indicates non-
condensable gases such as air are present in
the storage tank. The unit will purge automati-
cally next time the unit is turned on when the
“Y” is displayed. An “N” indicates non-
condensable gases are below the set limit. An
“E” indicates the unit purged for fifteen (15)
seconds and non-condensable gases are still
present. This is a safety feature which prevents
excess purging when a malfunction occurs
somewhere in the system. See the Purging Non
-Condensable Gas section for further details.
4. Option - Displays the Option number of the cur-
rent operation.
5. Status Line - Displays programming commands
and informs the user of current status of the
unit.
Available Functions:
The main menu allows you to access the following
functions.
1. Option 1 - Recover, is used to recover and
recycle refrigerant from an automobile A/C
system. This Option is most often used prior to
opening an A/C system to atmosphere to
replace a system component.
2. Option 2 - Vacuum, is used to vacuum air/
moisture from a system previously opened to
the atmosphere. This Option will then proceed
to recharge the A/C system. This Option also
allows the technician to verify the A/C system
will hold a vacuum for a certain length of time.
3. Option 3 - Charge Only, adds refrigerant to an
A/C system.
4. Option 4 - Full Cycle, performs a complete
recovery, recycling, evacuating and charging of
an automobile A/C system.
5. Option 5 - Oil injection, is used to inject oil into
the Automobile’s A/C system. (37887 and
37888) Hybrid Hose Flush, is used to clear the
hoses of oil before using the unit on a hybrid
A/C system. DOES NOT APPLY TO 37837.
6. Option 6 - Tank Refill, is used to add new
refrigerant to the storage tank.
7. Option 7–Vehicle Oil Flush, is used to flush the
oil from the vehicles A/C system.
8. Option 8 - Refrigerant Management System,
gives the technician access to information
about refrigerant use to date.
9. Option 9–Set-up, is used to access settings like
time and date, Scale calibration and system
information.
Function Keys / Numeric keypad
The Function Keys are used to enter data into the
system in a variety of modes.
UP ARROW–This key allows you to scroll up
through the menu
Down ARROW–This key allows you to scroll down
through the menu
Left ARROW - This key allows you scroll left
through the menu
Right ARROW - This key allows you to scroll right
through the menu
Numeric Key pad–these keys are used to select
desired time and weight and entering the filter
codes.
START- Press START to begin a selected opera-
tional mode.
ENTER–Press ENTER to enter the desired function
or setting
RESET- Press RESET to cancel the current opera-
tion. The RESET may have to be pushed more than
once to return to “Main Menu”
Control Panel Features