Master cool R134a User manual
2
Instruction Manual
R134a DIGITAL MANIFOLD
Includes Automotive Refrigerant and Oil Capacity Readings
SPECIAL FEATURES
• Automotive Refrigerant & Oil Capacity Readings for over 1000 Makes & Models
• Automatic Warm-up
• Low Battery Indicator
• Large Digital Display of Pressures and Temperatures
• Protective Rubber Boot for Durability
• Heavy Duty Hook folds back into unit for compact storage
• Capable of Software Upgrade through optional USB and CD
SPECIFICATIONS
• Refrigerant: R134a
• Pressure & Vacuum Display: Low Side - PSI/IN-Hg , Bar, MPa, Kg/cm2
High Side - PSI, Bar, MPa, Kg/cm2
• Temperature Display: -40 to 200°F (-4 to 93°C)
• Response Time: 250 mSec.
• Connection: 1/2” acme or 1/4” flare
• Operating Temperature: 32 to 122°F (0 to 45°C)
• Power: 9V DC battery
• Battery Life: 50-60 hours continuous use
• Low Battery Indicator: Special ICON on LCD
WARNINGS
• Wear safety glasses / Wear gloves
• Do not vent refrigerant into the atmosphere.
• If eyes come in contact with refrigerant, immediately flush with plenty of
water and seek medical attention.
• Keep in a dry place. Do not allow moisture to enter the unit.
• IMPORTANT NOTE REGARDING STATIC DISCHARGE: Climates in some parts
of the world are conducive to creating static electric build up (ESD). Your
digital manifold has been designed to eliminate the damaging effects of
ESD. In some extreme cases, ESD will be apparent on your digital
manifold by a lack of response or an inability to turn off the unit. In the
rare case that this occurs, simply disconnect the battery, wait 1 minute
and reconnect the battery. The digital manifold will “reboot” itself and
operate normally once the unit is turned on.
BATTERY INSTALLATION
Remove the battery compartment cover. Make
sure to place the battery into the
compartment with the correct polarity. Re-
place battery cover.
Note: If you need to replace the battery
allow 15-20 seconds before reconnecting
the battery to the battery snaps.
BATTERY COMPARTMENT
PRESSURE ADJUSTMENT FOR ELEVATION
For an accurate reading, it is important to adjust the manifold for elevation.
Follow these steps to set the unit for local elevation and barometric readings.
1. Press the POWER button to turn the unit ON.
2. Allow 10-15 seconds for warm-up and readings to stabilize. (You will see all
characters and units countdown 9999,8888,7777... ) Once the warm-
up is complete, only pressure and temperature readings will appear.
3. Since the manifold reads gauge pressure it must be set for local elevation
and barometric readings. Press and hold the UNIT button and then the ENTER
button simultaneously for 6-8 seconds and release. Pressure readings will
now be truly zero.
NOTE: In some cases pressure readings may not be zero with the manifold
disconnected from the pressure or vacuum source. Press and hold the UNIT
button and then the ENTER button simultaneously for 6-8 seconds and
release. Pressure readings will now be zero.
English
3
WARNING! If the manifold is connected to a pressure or
vacuum source and displays actual readings, do not attempt
to zero out the reading by pressing the enter button. This can
offset the reading.
BASIC SET-UP
The following settings are pre-programmed into the unit.
• Pressure: PSI / IN-Hg
• Temperature: °F
To change these settings please follow the procedure below:
• Press the POWER button to turn the unit ON. Allow 10-15 seconds for warm-up
and readings to stabilize. (You will see all characters and units countdown
9999,8888,7777... ) Once the warm-up is complete, pressure and
temperature readings will appear.
• Press the UNITS button to select the desired pressure/temperature. Scroll
through PSI, Kg/cm2, Bar, Mpa in ˚F. Continue to scroll for pressures to display
in ˚C
SETTING MANUFACTURER/MODEL/YEAR FOR REFRIGERANT & OIL CAPACITIES
• Press VEHICLE or VEHICLE button to scroll through each manufacturer.
VEHICLE to go in alphabetical order/VEHICLE in reverse alphabetic
order.
Manufacturers Include: Acura, Alfa Romeo, Aston Martin, Audi, BMW, Buick,
Cadillac, Chevrolet, Chrysler, Citroen, Daewoo, Daihatsu, Dodge, Eagle,Fiat,
Ford, Geo, GMC, Honda, Hummer, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia,
Lancia, Land Rover, Lexus, Lincoln, Mazda, Mercury, Mini, Mitsubishi, Mercedes
Benz, Nissan, Oldsmobile, Opel-Vauxhall, Peugeot, Plymouth, Pontiac, Porsche,
Renault, Rover, Saab, Saturn, Scion, Seat, Skoda, Smart, Ssangyong, Subaru,
Suzuki, Toyota, Volkwagen, Volvo
• Press ENTER once desired manufacturer is found.
• Press VEHICLE to scroll through each model/year. For faster scrolling, press
and hold VEHICLE or (If you pass the model/year you desire use the
button to go back.)
• Once you have found the desired model/year, you can change the units of
measure by pressing the UNITS button. Scroll through your options of LBS/OZ,
LBS/ML, KG/OZ, KG/ML .
• Press ENTER once desired model, year and measurement is found.
• Refrigerant & Oil Capacity measurements will display at the top of the LCD
screen.
• Press ENTER again to begin pressure readings.
PRE-SERVICE INSTRUCTIONS
1. Close both valves on the manifold gauge set by turning the High and Low
knobs clockwise.
2. Attach the High and Low couplers to the Red and Blue hoses.
If using manual couplers, open the plunger by turning the knob counter-clock
wise prior to connection to the system. (fig. A)
3. Connect the Red hose to the High port and the Blue hose to the Low port on
the manifold gauge.
HOOK-UP FOR SYSTEM DIAGNOSIS
To properly diagnose the problem in the A/C system, first check the
system’s overall performance. This includes testing the system’s pressure and
refrigerant flow. The system pressure can be checked with the manifold gauge
set.
NOTE: Be sure that the hand valves on the manifold gauge set are in the
closed position. Always wear gloves and safety goggles when working with
refrigerant.
1. Remove the protective caps from the system ports. Check for leaks at the
ports.
2. Connect the Low side service hose (Blue) to the suction side of the
compressor. Connect the High side service hose (Red) to the discharge side of
the compressor. Make sure the couplers are securely snapped.
3. If using manual couplers, move the plunger down within the coupler by turning
the knob clockwise in order to open the port valves and start refrigerant flow.
4
IMPORTANT NOTES
A system that has been opened or one that is found to be excessively low on
refrigerant pressure as a result of a leak, must be fully evacuated by means of
recycling and deep vacuum.
A system that has been evacuated must be repaired, leak tested and evacuated
before charging. If charging on the liquid or High side, use only the High side
valve on the manifold gauge set. Make sure the Low side valve is closed. After
charging, test the system by turning on the engine and running the A/C with
both valves closed on the manifold. After testing, disconnect the couplers from
the system and make sure to use a recovery/recycling machine to evacuate any
refrigerant remaining in the hoses.
BAR PSIN-Hg MPa Kg/cm
2
BAR PSI MPa Kg/cm
2
High
Low
Ref.Cap.:2.70 LBS OIL.Cap.:11.00 oz
DIAGNOSING TIPS FOR THE A/C SYSTEM
• Low side and High side pressures are low. Usually indicates a low charge.
• Low side pressure is low and High side pressure is high. Usually indicates a
blockage in the system. (i.e. expansion of valve or orifice tube.)
• Low side pressure is high and High side pressure is low. When accompanied
by a fluctuating digital reading, usually indicates faulty reed valves in
compressor.
• Low side and High side pressures are high. Usually indicates an over charged
system.
R134a TEMPERATURE PRESSURE CHART
Ambient Temperature (˚F) Low Side Gauge High Side Gauge
65˚ 25-35 psi 135-155 psi
70˚ 35-40 psi 145-160 psi
75˚ 35-45 psi 150-170 psi
80˚ 40-50 psi 175-210 psi
85˚ 45-55 psi 225-250 psi
90˚ 45-55 psi 250-270 psi
95˚ 50-55 psi 275-300 psi
100˚ 50-55 psi 315-325 psi
105˚ 50-55 psi 340-345 psi
CHARGING REFRIGERANT
A. Verify that both valves on the manifold are shut completely.
B. Turn on car and A/C system (this will aid in charging of the refrigerant.)
C. Connect the other end of the yellow hose to Refrigerant Gas supply.
(Follow refrigerant manufacturer’s instructions for proper dispensing.)
D. Open manifold low side (blue) valve slowly until pressure reaches 40 psi.
Do no exceed 40 psi during recharging process. Exceeding 40 psi could
damage the compressor.
E. When charging is finished, close low side (blue) valve.
5
EVACUATION OF SYSTEM WITH VACUUM PUMP AND LEAK TESTING
A. Verify that there is no refrigerant in the A/C system.
B. Attach blue and red adapters to A/C system.
C. Connect yellow hose to vacuum pump, turn on pump.
D. Open manifold low side (blue) valve.
E. Open manifold high side (red) valve.
*After system has been evacuated to a gauge reading of 29 IN-Hg (inches of
vacuum), run vacuum pump for 20 minutes.
F. Close both high and low side manifold valves.
G. Allow system to sit and check gauges to verify vacuum remains.
R134a DIGITAL MANIFOLD PARTS LIST
A. Complete Stem Assembly w/Knob (2 pcs)
B. Piston Seal Assembly w/O-Rings (2 pcs)
C. Piston Seal O-Rings
D. Stem O-Ring
E. Stem, Nut and Stem O-Ring
F. Knob only, Low Side (Blue)
G. Knob only, High Side (Red)
H. Manual Low Side Coupler - complete
I. Manual High Side Coupler - complete
J. Low Side O-Ring
K. High Side O-Ring
L. Gasket for Hose Assembly
M. O-Ring for Male Fitting
N. Gasket for 1/4“ FL
O. Shut-Off Valve O-Ring (1/2” ACME)
P. Shut-Off Valve O-Ring (1/4” FL-F)
Q. Optional USB and CD for Software Upgrade
TROUBLESHOOTING:
+-
Low Battery Indicator:
A special icon will appear in the lower right hand corner of the LCD
when the battery must be replaced.
No Display:
Check the battery and polarity.
WARRANTY
This product warrants against defects in material and workmanship for a period
of one year. This warranty does not cover failure due to abuse, improper usage,
or progressive wear and tear.
Warranty becomes valid to the original user, effective on the purchase date.
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