Hitachi RAS-(2-3)HVRN(S)(2), Service Manual

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3 Piping work and
refrigerant charge
58
SMGB0064 rev.0 - 08/2011
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Refrigerant charge quantity for ES 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).
• Determine an additional refrigerant quantity according to the following procedure, and charge it into the system.
• 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-2HVRN2 1.6 30 0.03
RAS-2.5HVRN2 1.6 30 0.03
RAS-3HVRNS2 1.9 20 0.03
RAS-4H(V)RNS2E 2.8 20 0.04
RAS-5H(V)RNS2E 2.9 30 0.06
RAS-6H(V)RNS2E 2.9 30 0.06
RAS-8HRNSE 6.0 30 0.065
RAS-10HRNSE 6.2 30 0.12
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 4HVRNS2E is 30 m according to
the table before.
• Additional Correction Value P : for 4HVRNS2E, “0.04” ac-
cording to the table above.
• Additional Charge amount W will be:
W= (L-ℓ) x P
Example: W= (36-20) x 0.04 = 0.64 (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 ℓ(m) or longer