Service Tool Information
SERVICE TOOLS FOR R134a AIR CONDITIONERWhen servicing R134a air conditioning systems always use the R134a dedicated manifold gauges, gas leak detector and vacuum pump adaptor.
1. Use manifold gauges for r134a air conditioner.
Always use R134a dedicated manifold gauges to prevent R12 and R12 compressor oil contaminating the R134a system.
2. Use R134a gas leak detector.
Similarly, always use an R134a dedicated leak detector. The R12 leak detector is not sufficiently sensitive.
3. Use vacuum pump adapter. By connecting a vacuum pump adapter, the vacuum pump can be used for both R134a and R12 air conditioning systems. The vacuum pump adaptor has an internal magnetic valve. When evacuation is completed and the vacuum pump switch is turned off, the magnetic valve opens allowing the introduction atmospheric air into the manifold gauges to prevent the back flow of oil from the vacuum pump into the gauge hose.
CAUTION: Be sure to turn off the manifold gauge valve immediately after evacuating the system. Then you may switch off the vacuum pump. If this order is reversed, the liquid will be temporarily open to atmosphere.