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Open the gas side and liquid side service valve completely after charging the refrigerant.
( If you operate the Air to water heat pump with the service valve closed, the important parts may
be damaged.)
Installing the Refrigerant Pipe Work (Continued)
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
Gas side
Scale
Liquid side
Manifold gauge
Service valve
Outdoor unit
Low pressure
side
High pressure
side
Suction charging
※
Adding refrigerants in heating conditions
Gas side
Scale
Liquid side
Manifold gauge
Service valve
Outdoor unit
Low pressure
side
High pressure
side
Suction charging
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.)
Adding the cooling refrigerant
1) Press the function key for adding refrigerant in cooling mode.
2) After 20 minutes of operation, open the valve on gas side.
3) Open the valve for low pressure side on the manifold gauge to recharge the remaining refrigerant.
Adding the heating refrigerant
1) When recharging the heating refrigerant, connect the low pressure pipe from manifold gage
to the suction charging port.
2) Press the function key for adding refrigerant in heating mode.
3) After 20 minutes of operation, open the valve on suction charge port.
4) Open the valve for low pressure side on the manifold gage to recharge the remaining refrigerant.
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