Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 344

FDT ( N ) -H
(e) Refrigerant charge
1) Outdoor unit is pre-charged R-22 and R407C refrigerant at a factory as shown in Table 1.
2) Indoor unit is pre-charged only a small amount of nitrogen gas for prevention of the air entry.
3) Additional charge on site is required when the pipe length is longer than that of restricted value (Which is varied wirh the
type of Indoor unit) as shown in Table 1.
Table 1
Item
Model
FDC(P)208H type
FDC258H type
FDCP258H type
FDC308H type
FDCP308H type
FDC408H type
FDCP408H type
FDC508H type
FDCP508H type
FDC808 type
FDC1008 type
FDC208C type
FDCP208C type
FDC258C type
FDCP258C type
FDCP308C type
FDCP408C type
FDCP508C type
Note (1) *3. The values in ( ) are when connected to FDKN Series indoor unit.
1 Additional charge amount
¡ Calculate the additional charge amount according to Table 1.
Example : In the case that FDT508HES-SA is newly installed with piping length of 40m.
(30 – 5) (m) × 0.035 (kg/m) + (40 – 30) (m) × 0.02 (kg/m)= 1.075 (kg)
¡ In the case of recharge the refrigerant for service, calculate the proper amount of refrigerant depending on the piping length on
site.
Example : In the case that FDT508HES-SA with piping length of 15m is fully recharged in service.
1.9 (kg) + (15 – 5) (m) × 0.035 (kg/m)= 2.25 (kg)
Factory charge amount for FDC508HES3.
342
Additional charge amount
Factory charge amount
(kg)
0.98
1.10
1.20
1.40
1.75
1.70
2.21
1.90
2.58
5.33
7.60
0.90
0.87
1.05
1.07
1.63
2.12
2.58
0 m
2
Outdoor Unit
Total length of the piping (one way).
When piping length is 30m or less, additional charge amount per 1m.
Length that additional charge is not required.
Additional charge amount per 1m.
Length that additional charge is not required.
Total length of the piping (one way).
Pipe length that
1 (kg/m)
additional charge is not
required (m)
0 ~30m 30 ~ 50m
0.015 –
–
0.025
0.02
0.035 2
0.045
–
0.07
0.015
–
0.025
0.02
0.035 2
30 m
50 m
0.02kg/m
Indoor Unit
Additional charge amount.
When piping length is more than 30m,
additional charge amount per 1m.
Recharge amount.
Maximum piping
length (m)
0 (5) *3
30
5
50
0 (5) *3
30
5
50