Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 722

V MULTI
Double twin specification (FDC808, 1008HES3 only)
G = main piping L (m) × C + branch piping L
(m) × f + branch piping
+ branch piping
2
Example of Calculation
1) For twin type
Outdoor Unit: FDC508HES3
Indoor Unit: FDT258-A + FDR258-A
Outdoor unit
Liquid line φ9.52
FDC508
Main piping L=30m
Twin Type
G=30m(L) × 0.035kg/m + 5m(
=1.13kg
2) For double twin type
Outdoor Unit: FDC1008HES3
Indoor Unit: FDT258-A + FDT258-A + FDR258-A + FDR258-A
Outdoor unit
FDC1008
Double twin Type
G=20m(L) × 0.07kg/m + 10m(L
- (7.6 - 7.25)=1.8kg
For recharging If vacuum extracted and recharging.
Twin & triple specifications
G = B + main piping L (m) × C + branch piping
Double twin specification (FDC808, 1008HES3 only)
G = main piping L (m) × C + branch piping L
(m) × f + branch piping
+ branch piping
2
(4) Electrical wiring
™ This air conditioning system should be notificated to supply authority before connection to power supply system.
(a) Selection of size of power supply and interconnecting wires.
IMPORTANT
¡ Select wire sizes and circuit protection from Table 2.
Table 2 ( This table shows 20m length wires with less than 2% voltage drop. )
Item
Model
FDC508HES3
FDC808HES3
FDC1008HES3
720
(m) × f + branch piping L
1
(m) × f + branch piping
3
φ9.52
=5m
1
φ9.52
=5m
2
) × 0.025kg/m + 5m(
1
Amount of additional charge: 1.13 kg
Liquid line φ15.88
Main piping L=20m
φ9.52
L =5m
2
) × 0.025kg/m + 20(
+L
1 2
Amount of additional charge: 1.8 kg
× f + branch piping
1
(m) × f + branch piping L
1
(m) × f + branch piping
3
¡ Electric wiring work should be conducted only by authorized personnel.
¡ Use copper conductor only.
¡ Power source wires and Interconnecting wires shall not be lighter than
polychloroprene sheathed flexible cord (design HO5RN-F IEC 57).
¡ Do not connect more than three wires to the terminal block.
¡ Use round type crimped terminal lugs with insulated grip on the end of the wires.
Circuit breaker
Phase
Switch breaker
(A)
30
3
50
(m) × f + branch piping
2
(m) × f - (D - B)
4
Indoor unit
FDT258-A
FDR258-A
) × 0.025kg/m - (1.90 - 1.73)
2
Indoor unit
φ9.52 φ9.52
FDT258-A
L =5m =5m
1 1
φ9.52
FDT258-A
=5m
1
φ9.52
FDR258-A
=5m
3
φ9.52
FDR258-A
=5m
4
) × 0.025kg/m
+ + +
1 2 3 4
(m) × f + branch piping
2
(m) × f + branch piping
2
(m) × f
4
Power source
Over-current protector
rated capacity (A)
20
50
(m) × f
1
(m) × f
3
(only fortriple specifications)
(m) × f
1
Interconnecting
wires and grounding
(minimum) wires (minimum)
1.6mm
2
5.5mm
2.0mm
2
8.0mm