MasterCool 99661-A Manual De Instrucciones página 3

barometric pressure. 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 unit to initialize. (You will see all characters and units
countdown 99999,88888,77777... ) Once initialization is complete, only
pressure and temperature readings will appear.
NOTE: Certain refrigerants do not have a temperature display at a given pressure.
In order to achieve an accurate pressure and temperature reading it is recommended to
press and hold the ENTER button for 8 - 10 seconds and then release. Pressure readings
will now be truly zero. Due to environmental factors such as elevation, temperature and
humidity, you should complete this process each time you turn the unit on to read pressure
or vacuum. DO NOT ATTEMPT TO ZERO UNIT OUT WHILE UNDER PRESSURE.
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.
SETTING REFRIGERANT, PRESSURE, TEMPERATURE AND AUTO-OFF
• Press the POWER button to turn the unit ON. Wait for the unit to initialize [a refrigerant,
pressure, temperature or vacuum will be displayed when the unit is ready].
• Press the SELECT button to access the REFRIGERANT MENU.
Press SELECT again to display refrigerant type.
[To scroll through the refrigerants press the select/↑ or vacuum/↓ button: R12, R22,
R23, R32, R113, R114, R115, R116, R123, R124, R134, R134a, R141B, R142B, R143,
R143a, R152a, R290, R401A, R401B, R404A, R407A, R407B, R407C, R407D, R407F,
R409A, R410A, R410B, R411A, R411B, R412A, R413A, R414A, R414B, R417A, R422A,
R422B, R422C, R422D, R427A, R434A, R437A, R438A, R441A, R448A, R449A, R452A,
R455A, R501, R502, R503, R504, R507A, R508B, R509A, R600, R600A, R601, R601A,
R744]
Press ENTER to confirm the desired refrigerant.
• Next the PRESSURE UNIT will display.
Press the SELECT button to change the pressure unit. Press ENTER to confirm.
• Next the TEMPERATURE UNIT will display.
Press the SELECT button to either °F or °C. Press ENTER to confirm.
• Next AUTO-OFF will display.
Press the SELECT button to disable Auto-Off [auto-off will clear from the display.]
If the auto-off feature is displayed the manifold will shut down after 15 minutes. Press
the ON/OFF button to turn the unit back on and allow 15-20 seconds to initialize.
NOTE: It is recommended to keep the auto-off feature enabled to save the life of
the battery.
SETTING VACUUM
• Connect the vacuum sensor cable to the manifold and turn the unit on.
• Press the VACUUM button. This will phase out the temperature display and only show the
vacuum units.
Press the SELECT button until the desired vacuum unit is displayed.
Press ENTER to confirm.
• The vacuum display will automatically go off after 15 minutes. Press the ON/OFF button
and VACUUM button to turn the unit on. Allow 30-45 seconds for the sensor to warm up
and the correct vacuum reading to appear. (If pressure, temperature or deep vacuum
is being used for an extended period of time turn the unit off and turn back on
again when reading is required.)
NOTE: (SEE FIG. A) To disconnect the
vacuum sensor cable be sure to press
the release latch under the connector
cable. Pulling on the cable without
disengaging the latch will cause
damage and is not replaceable under
warranty.
IMPORTANT NOTES FOR SERVICING AC/R SYSTEM
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 recovery/recycling and
deep vacuum. A system that has been evacuated must be repaired, leak tested and
evacuated again before charging.
DIAGNOSING THE SYSTEM PRESSURE AND TEMPERATURE
1. Make sure both valves on the manifold are closed (turn knobs clockwise).
2. Connect the blue and red hose from the low and high side of the manifold to the system.
3. Start the system and allow some time for the true pressure reading on the manifold to
appear and stabilize.
CHARGING
1. Verify that both valves on the manifold are shut completely.
2. Turn the A/C system and manifold ON.
3. Connect the other end of the yellow hose to Refrigerant Gas supply.
4. Open manifold low side (blue) valve slowly and start charging. (Follow refrigerant
FIG. A
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