Refrigerant piping & refrigerant charge14
14.6 REFRIGERANT CHARGING QUANTITY
In case of the actual piping length is more than the specied length, the additional refrigerant quantity should be charged according
to the table below:
Outdoor unit refri-
gerant charge (kg)
Chargeless length (m)
Additional refrigerant charge (P)
(kg/m)
Max additional
charge (kg)
1 IU 2 IU 1 IU 2 IU
RAS-2HVNP1 1.6 30 0 0.03 0.03 1.5
RAS-2.5HVNP1 1.6 30 0 0.03 0.024 1.2
RAS-3HVNC1 1.9 20 20 0.04 0.04 1.2
RAS-3HVRNS3 1.9 20 20 0.04 0.04 1.2
1 Determine an additional refrigerant quantity according to the following procedure, and charge it into the system.
2 Record the additional refrigerant quantity to facilitate service activities thereafter.
CAUTION
• When charging refrigerant accurately measure refrigerant to be charged.
• Overcharging or undercharging of refrigerant can cause compressor trouble.
• In case of actual piping length less than 5 m, consult your distributor.
Additional refrigerant quantity calculation
Calculate piping length L(m)
Outdoor unit
Indoor unit
L: Piping Length
l: Chargeless length
P: Additional refrigerant charge
(a): No additional charge is required: L≤l
(b): Additional charge is required: L≥l
W (additional charge quantity) = (L-l) x P
Example:
L: 50 m
l: 30 m
P: 0.03
L = 50
Outdoor unit
RAS-2HVNP1
Indoor unit
W (additional charge quantity) = (50-30) x 0.03 = 0.6 kg
Setting of Pipe Length DSW.
DSW2 setting will be required only when the refrigerant pipe
length is shorter than 5 m or longer than 30 m. Pipe length setting
shall be performed as shown below.
(The side in the table below shows the DSW location)
DSW2 on Outdoor PCB1
Factory setting Pipe Length ≤ 5m Pipe Length ≥ 30m
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