Mastercool R1234yf 2-way Piston Valve - Manual

OPERATING INSTRUCTIONS
R1234yf MANIFOLD GAUGE SET yf yf
WARNING W W
Wear Safety Goggles
Avoid Contact with Refrigerant
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 orifi ce 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.
b. Turn on car and A/C system, (this will aid in charging of the refrigerant.)
c. Connect the other end of the yellow hose (3) to Refrigerant Gas supply. (Follow refrigerant
manufacturer’s instructions for proper dispensing.)
d. Connect vacuum pump to center tee and remove air from yellow hose and manifold (vacuum
pump hose not included.)
e. Open manifold low side (blue) valve slowly until pressure reaches 42 psi. Do not exceed 42 psi
during the recharging process. Exceeding 42 psi could damage the compressor.
f. When charging is fi nished, close low side (blue) valve.
SYSTEM SCHEMATIC
1. Low side (blue) hose/adapter.
(12mm-M fi ttings on both sides meets SAE J2888, EPA, SAE & UL standards)