MasterCool 89660 Manuals

www.mastercool.com OPERATING INSTRUCTIONS PROFESSIONAL R134a MANIFOLD GAUGE SET PART #89660 WARNING Wear Safety Goggles Avoid Contact with Refrigerant R134a TEMPERATURE PRESSURE CHART Ambient Temp (˚F) Low Side Gauge High Side Gauge 65˚ 25-35 psi 135-155 psi 70˚ 35-40 psi 145-160 psi 75˚ 35-45 psi 150-170 psi 80˚ 40-50 psi 175-210 psi 85˚ 45-55 psi 225-250 psi 90˚ 45-55 psi 250-270 psi 95˚ 50-55 psi 275-300 psi 100˚ 50-55 psi 315-325 psi 105˚ 50-55 psi 340-345 psi TROUBLESHOOTING TIPS • Low side and high side pressure are low. Usually indicates a low charge. • Low side pressure is low and high side pressure is high. Usually indicates a blockage in the system. (i.e. expansion of valve or orifice tube.) • Low side pressure is high and high side pressure is low. When accompanied by a vibrating gauge needle, usually indicates faulty reed valves in compressor. • Low side and high side pressures are high. Usually indicates an over charged system. HOOK-UP FOR SYSTEM DIAGNOSIS: • Verify that service ports are clean and free of metal shavings. • Verify that both valves on the manifold are shut completely. • Connect blue adapter to low side service port (5). • Connect red adapter to high side service port (4). • Start engine. Turn A/C mode selector to HIGH and fan to HIGH. • Observe pressure on the manifold gauges and refer to your automotive manual for proper diagnosis. CHARGING REFRIGERANT: a. Verify that both valves on the manifold are shut completely.