MasterCool R134a Instruction Manual page 2

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 dis-
connected 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.
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/cm 2 , Bar, Mpa in ˚F. Continue to scroll for pressures to display in ˚C.
SETTING MANUFACTURER/MODEL/YEAR FOR REFRIGERANT & OIL CAPACITIES
• Press VEHICLE
VEHICLE
to go in alphabetical order/VEHICLE
• Press ENTER once desired manufacturer is found.
• Press VEHICLE
VEHICLE or
• 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
NOTE: Make sure hoses are flushed and vacuumed before using another refrigerant to
avoid contamination
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 male end of the red and blue hoses. If using
manual couplers, open the plunger by turning the knob counter-clockwise 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.
MANUAL COUPLER (FIG. A)
To attach to the system, retract the plunger by turning the knob
fully counter-clockwise. Connect to the system by lifting up the
sleeve, placing the service port inside the coupler and releasing to
lock. To start the flow, turn the knob fully clockwise (opening the
service port).
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
2
or VEHICLE
button to scroll through each manufacturer.
to scroll through each model/year. For faster scrolling, press and hold
(If you pass the model/year you desire use the
in reverse alphabetic order.
button to go back.)
SLEEVE