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Adding Refrigerant
• The R410A refrigerant is blended refrigerant. Add only liquid refrigerant.
• Measure the quantity of the refrigerant depending on the length of the liquid side pipe. Add fixed quantity of the
refrigerant using a scale.
Adding refrigerants in cooling conditions
Manifold gauge
Low pressure
side
Scale
Adding refrigerants in heating conditions
Manifold gauge
Low pressure
side
Scale
• Connect the manifold gauge and purge the manifold gauge.
• Open the manifold gauge valve of the liquid side service valve and add the liquid refrigerant.
• If you cannot fully recharge the additional refrigerant while the outdoor unit is stopped, use the key on the outdoor
unit PCB to recharge the remaining refrigerant. (Refer to page 37.)
Gas side
for hydro
High pressure
Gas side
side
for Air
(Not in use)
Gas side for hydro
Gas side
High pressure
for Air
(Not in use)
side
Suction charging
Outdoor unit
Liquid side
Service valve
Suction charging
Outdoor unit
Liquid side
Service valve
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