MasterCool 89660 Instrucciones De Operación página 2

The 1990 amendments to the United States Clean Air Act mandate that all personnel who
service refrigerant systems must be trained and certified. Fines are in place for violations
and compliance is not being monitered by the U.S. EPA.
PRE-SERVICE INSTRUCTIONS
1. Close both valves on the manifold gauge set by turning the High and Low knobs clockwise.
2. The gauges are correctly calibrated at the factory before shipment. If calibration is required, insert a
straight blade screwdriver into the adjusting screw on the gauge face.
3. 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. If E-Z Snap
couplers are used, pull the sleeves up to unlock position before attaching to an A/C system (figs. A & B).
4. Connect the Red hose to the High port and the Blue hose to the Low port on the manifold gauge.
TESTING AND CHARGING
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. These conditions 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
(fig. D).
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.
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. (fig. C)
• A system that has been evacuated must be repaired, leak tested and evacuated again to 29" Hg. 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.
WARNING
• WEAR GOGGLES!!
• DO NOT VENT REFRIGERANT INTO ATMOSPHERE
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