Nissan Micra K11 silhouetteK11

DISCHARGING, EVACUATING, CHARGING AND CHECKING — Evacuation / Checking Airtightness / Charging Refrigerant

HA-18prose procedure
Continued from HA-17

Evacuation

Evacuation procedure

  1. 1
    Completely tighten low pressure and high pressure adapter valves.
    Evacuation setup schematic. Compressor (top centre) with hoses from evaporator (low pressure gauge) and to condenser (high pressure gauge), both valves open at the manifold, an additional valve (open) and vacuum pump at lower right.
    SHA952C
  2. 2
    Open high and low pressure valves of manifold gauge set and additional valve.
  3. 3
    Run vacuum pump.
  4. 4
    Perform evacuation for more than five minutes to stabilize the vacuum inside the system. Check to ensure that the low pressure gauge indicates -98.6 to -101.3 kPa (-986 to -1,013 mbar, -740 to -760 mmHg, -29.13 to -29.92 inHg).
    Engine bay close-up of the manifold gauge set with low-pressure gauge reading -101.3 kPa (-1,013 mbar, -760 mmHg, -29.92 inHg) during evacuation. Arrows show valve cocks rotating to close after evacuation.
    SHA445D
  5. 5
    Shut off high and low pressure valves and additional valve.

Checking airtightness

  1. 1
    Shut off high and low pressure valves and additional valve, and leave the system as it is for 5 to 10 minutes.
    Manifold gauge set during air-tightness check. Both valve cocks LO and HI shown closed. Low-pressure gauge labelled with text 'Needle return is not allowed.' Bottom ports labelled 'To low pressure service valve', 'To vacuum pump', 'To high pressure service valve'.
    SHA954C
  2. 2
    Make sure that the needle of low pressure gauge will not move back toward atmospheric pressure side (gauge pressure 0).

EVACUATION

If no abnormality is found during airtightness check, perform evacuation again for more than 20 minutes.

Evacuation (second stage)

  1. 1
    Run vacuum pump.
  2. 2
    Open high and low pressure valve and additional valve.
  3. 3
    Evacuate for more than 20 minutes.
  4. 4
    Close high and low pressure valves and additional valve.

Charging Refrigerant

Setting of charging cylinder

  1. 1
    Make sure that inlet and outlet valves of charging cylinder are closed.
    Charging-cylinder base view with sight glass on the upper right, outlet valve (close) at the bottom-left, outlet valve (slowly open) at bottom-right and inlet valve (slowly open) at the centre bottom.
    RHA677B
  2. 2
    Slowly open liquid line valve of refrigerant tank.
  3. 3
    Slowly open inlet valve of charging cylinder.
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