Hitachi RAS-10HRNM, Service Manual, Page: 65 / 482

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 required
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:
O/U MODEL Wo (Kg) Chargeless Length ℓ(m) Additional Charge Factor (P)
RAS-3HVRNME 2.4 30 0.04
RAS-4H(V)RNM1E 3.9 30 0.06
RAS-5H(V)RNM1E 3.8 30 0.06
RAS-6H(V)RNM1E 3.8 30 0.06
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 4HVRNM1E is 30 m according to
the table before.
• Additional Correction Value P : for 4HVRNM1E, “0.06”
according 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
Factory setting Factory setting Factory setting
Piping length between 5 m and ℓ(m) Pipe Length 5 m or shorter Pipe Length 30 m or longer
3 Piping work and
refrigerant charge
57
SMGB0060 rev. 1- 12/2010
3