3 Piping work and
refrigerant charge
57
SMGB0064 rev.0 - 08/2011
3
3.2.7 Refrigerant charge quantity
Refrigerant charge quantity for IVX series
Outdoor units has been charged with refrigerant for ℓ(m) of actual piping length. An additional refrigerant charged is re-
quired in systems with actual piping length longer than ℓ(m).
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.
C A U T I O N
• 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.
Outdoor unit Factory Refrigerant charge (Wo Kg) is the next:
MODEL Wo (Kg) Chargeless Length ℓ(m) Additional Charge Factor (P)
RAS-3HVRNM2E 2.4 30 0.04
RAS-4H(V)RNM2E 3.8 30 0.06
RAS-5H(V)RNM2E 4.0 30 0.06
RAS-6H(V)RNM2E 4.0 30 0.06
RAS-8HRNM 7.3 30
RAS-10HRNM 7.8 30
RAS-12HRNM 8.5 30
1 Refrigerant shall be added if L is longer than the chargeless length shown in the table above.
Calculate the additional amount as follows:
A. 30 m.
B. 8 m.
C. 8 m.
• Chargeless Length ℓ: for 4HVRNM2E is 30 m according to
the table before.
• Additional Correction Value P : for 4HVRNM2E, “0.06” ac-
cording to the table above.
• Additional Charge amount W will be:
W = (L-ℓ) x P
Example: W
1
= (46-30) x 0.06 = 0.96 (kg)
2 Charge the amount W calculated by point 1.
3 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 DIP switch show the position.)
DSW2 on outdoor PCB1
Model
Factory setting
Piping length between
5 m and ℓ(m)
Pipe Length 5 m or shorter Pipe Length 30 m or longer
RAS-(4-6)H(V)RNM2E
RAS-3HVRNM2E
RAS-(8-12)HRNM
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