18
REFRIGERANT PIPING & REFRIGERANT CHARGE
Calculation of Refrigerant Concentration
1. Calculate the total quantity of refrigerant R (kg) charged
in the system connecting all the indoor units of rooms to
be air-conditioned.
2. Calculate the room Volume V (m³) of each room.
3. Calculate the refrigerant concentration C (kg/m³) of the
room according to the following equation:
R R: Total Quantity of Charged Refrigerant (kg)
≤ C
V: Room Volume (m³)
V C: Refrigerant Concentration 0.44 kg/m³ for R410A
Countermesure for Refrigerant Leakage According to
KHK Standard
1. Provide a shutterless opening which allow fresh air to
circulate into the room.
2. Provide a doorless opening of 0.15% or more size to the
floor area.
3. Pay a special attention to the place, such as a
basement, etc., where refrigerant can stay, since
refrigerant is heavier than air.
11.1.3. PIPING CONNECTION FOR OUTDOOR
UNIT
1. After install the piping at the rear side, arrange the
piping according to the installation position.
2. Attach the pipe cover to avoid entering rain water into
the unit.
3. Use a pipe bender for pipe bending work when
connecting pipes.
11.1.4. TIGHTENING
Tightening work on the flare nut
Rear side
piping
Pipe cover
Stop valve
Connecting
piping
Direction to remove
Pipe Cover
Do not work with
two spanners
here.
Refrigerant
leakage shall
occur
Use two spanners
her for pipe
connection
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