Aisin AXGP224E1, Technical Manual, Page: 106 / 126

10
5.3 Refrigerant gas extra charge
WARNING
Accurately measure the length of the piping and charge with the proper amount of refrigerant
gas. Failure to observe this prescription could result in malfunctioning of the YOSHI AWS unit.
When charging the refrigerant gas, make sure to wear proper protective gloves.
Refrigerant gas leakages can cause frost bites.
•
Each of the GHP connected to the YOSHI AWS unit must be considered as an independent
refrigerant circuit. Quantities mentioned below are referred to one single GHP.
•
Always charge the refrigerant as a liquid in the tank. In case of charging as a gas may cause a
compositional change of the refrigerant, and could result in a performance decline or a
breakdown.
•
Always use a refrigerant scale when charging the refrigerant. Using a charging cylinder may
cause a compositional change of the refrigerant, could result in a performance decline or a
breakdown.
•
To avoid cross-contamination with other oil types, make sure to separate maintenance tools
according to the type of refrigerant used. In particular, never use the gauge manifold and
charging hose with other refrigerants than R410a.
After confirming the factory charge on the AISIN GHP label, use the following equation to
determine the necessary extra amount of refrigerant gas. Always refer to the liquid pipe lengths
and diameters only.
Extra charge (kg) = ( L1 × 0.250) + (L2 × 0.170) + (L3 x 0.110) + 1.5
CAUTION
The refrigerant extra charge must be done in accordance with the procedures described in the
AISIN GHP installation manual. Failure to observe this prescription makes the warranty no longer no
longer valid and could result in malfunctioning of the YOSHI AWS unit.
L1: Liquid pipe Ø 19.0 total length (m)
L2: Liquid pipe Ø 15.9 total length (m)
L3: Liquid pipe Ø 12.7 total length (m)