Evacuation Using A Vacuum Pump; Air Purging By Refrigerant - Pioneer YN018GMFI16M2D Service Manual

1. Evacuation using a vacuum pump

1. Completely tighten the flare nuts of the indoor
and outdoor units, confirm that both the 2-way
and 3-way valves are set to the fully closed
position.
2. Connect the low side hose of the charging
manifold set to the 3-way valve's gas service
port.
3. Connect the Middle hose of the charging
manifold set to the vacuum pump.
4. Fully open the Low side valve of the charging
manifold set.
5. Operate the vacuum pump to evacuate.
6. Make evacuation for 30 minutes and check
whether the pressure gauge indicates as low as
-0.1Mpa (14.5Psi). If the meter does not indicate
-0.1Mpa (14.5Psi)
keep the pump on for 20 minutes more. If the
pressure reading can not be obtained as low as
-0.1Mpa (14.5Psi) after pumping for 50 minutes,
please check if there is any leakage points.
After vacuuming, fully close the low side valve
of the charging manifold set and than turn off
the vacuum pump. Confirm that the pressure
gauge needle does
approximately 15 minutes after turning off the
vacuum pump).
7. Turn on the core of the 3-way valve (using a
properly sized Allen Wrench) about 45°
counterclockwise for 6 or 7seconds and
observe the sound of the refrigerant coming
out. Than re-tighten the valve core. Make
sure the pressure indicated on the low side
pressure gauge is a little higher than the
atmospheric pressure. Then remove the
charging hose from the service port of the 3
way valve.
8. Fully open the valve cores of both 2 way
valve and 3 way valves and then securely
tighten the brass valve cover caps.
after pumping 30 minutes,
not move (within

2. Air purging by refrigerant

Procedure:
1). Confirm that both the 2-way and 3-way
service valves are set to the closed
position.
2). Connect the charging set and a charging
cylinder to the service port of the 3-way
valve.
3). Air purging:
Open the valves on the charging cylinder and
the charging manifold set. Purge the air by
loosening the flare nut on the 2-way valve
approximately 45' for 3 seconds then
closing it for 1 minute; repeat this for 3
additional times.
After purging the air, use a torque wrench to
tighten the flare nut on the 2-way valve.
4). Check for any gas leakage:
Check all flare connections for gas leakage.
5). Discharge the refrigerant:
Close the valve on the charging cylinder and
discharge the refrigerant by loosening the
flare nut on the 2-way valve approximately
45' until the gauge indicates approximately
0.3Mpa (45Psi) to 0.5 Mpa (70Psi)..
Tighten the flare nut fully.
6). Disconnect the charge set and the
charging cylinder and open both cores of
the the 2-way and 3-way valves to fully
open position.
Be sure to use a proper size hexagonal (Allen)
wrench to operate the valve stems.
7). Mount the valve stem caps and the
service port cap.
Be sure to use a torque wrench to tighten the
service port cap to a torque 18N·m.
Be sure to check the for gas leakages.