MasterCool 99903 Operating Instructions Manual page 3

SELECT
VACUUM
ENTER
B/LT.
REC.
+
B/LT.
ENTER
REC.
+
B/LT.
ENTER
REC.
PRESSURE ADJUSTMENT FOR ELEVATION
For an accurate reading, it is important to adjust the manifold for elevation and 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].
REFRIGERANT MENU
• 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: R11, R12, R13, R21, R22,
R23, R32, R113, R114, R115, R116, R123, R124, R125, R134, R134a, R141B, R142B, R143, R143A,
R152A, R176, R218, R290, R401A, R401B, R401C, R402A, R402B, R403A, R403B, R404A, R405A,
R406A, R407A, R407B, R407C, R407D, R408A, R409A, R410A, R410B, R411A, R411B, R412A, R413A,
R414A, R414B, R417A (ISCEON MO59), R422A (ISCEON MO79), R422D (ISCEON MO29), R427A (FX100),
R501, R502, R503, R504, R507A, R508B, R509A, R600, R600A, R601, R601A]
Press ENTER to confirm the desired refrigerant.
PRESSURE UNIT
• Next the PRESSURE UNIT will display.
Press the SELECT button to change the pressure unit. Press ENTER to confirm.
TEMPERATURE UNIT
• Next the TEMPERATURE UNIT will display.
Press the SELECT button to either °F or °C. Press ENTER to confirm.
AUTO-OFF
• 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.
Press this key to scroll through and access Refrigerant
Menu, Pressure Unit, Temperature Unit, Auto-Off, Vacuum
Unit
Press this key to display vacuum units when vacuum
sensor cable is attached
• Press this key to confirm a selection
• Press this key for 8-10 seconds to configure a truly zero
pressure reading (when there is no pressure in the
system)
• Press this key to illuminate the display in darker areas
• Press this key for 5 seconds to start and stop the record
data mode
• Press these keys simultaneously for 3 seconds to
check the status of the recording
+
• Simultaneously press the enter and b/lt/rec. and
then press power to delete the recorded data from
POWER
the manifold (record mode must be off)
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Fig. A
3