268
FDTN-H
(b) Piping size
• Install the removed flared nuts to the pipes to be connected, then flare the pipes.
(c) Limitations for one way piping length and vertical height difference.
• One way piping length: Less than 30 m
• Vertical height difference: Less than 15 m
Precautions for refrigerant piping
• Do not twist or crush piping.
• Be sure that no dust is mixed in piping.
• Bend piping with as wide angle as possible.
• Keep insulation both gas and liquid piping.
• Check flare-connected area for gas leakage.
(d) Air purge
Carry out the air purge of the indoor unit and refrigerant piping by vacuuming.
Procedures.
1) Tighten all the flare nuts of the piping on the side of indoor and outdoor units so that there is no leakage.
2) Carry out vacuuming from the service valve charge port with the service valves (both liquid and gas side) of the outdoor
unit fully closed.
3) After vacuuming, remove the cap nut for the valve stem, and thghten the cap nuts (cap nuts for valve stem and charge
port) with service valve (both liquid and gas) fully opened.
(e) Method of opening and closing service valve of outdoor unit
1) Remote the hexagonal cap nut.
2) Operate the valve using a hexagonal wrench to open by left
turn and to close by right turn.
3) Tighten the hexagonal cap nut after the piping works.
(f) Additional charge of refrigerant
Model FDC206 FDC256, 306 FDC406, 506
Gas piping φ15.88 × 1.0 mm φ15.88 × 1.0 mm φ19.05 × 1.0 mm
Liquid piping φ6.35 × 0.8 mm φ9.52 × 0.8 mm φ9.52 × 0.8 mm
Notes (1) Basic refrigerant charge amount means refrigerant amount when refrigerant piping length is 0 m.
(2) When the refrigernat piping length exceeds the length that additional refrigerant charge is not required, charge
additional refrigerant based on to the calculated amount of refrigerant per unit piping length.
Item
FDC206H type 0.88 1.00
FDC256H type 1.13 1.25 0.025
FDC306H type 1.18 1.30 5 m
(5) (8)
FDC406H type 1.43
(4)
1.60
0.035
FDC506H type 2.13 2.30
FDC206CEN3 0.78 0.90
0
30 m
FDC206CEP3 1.03 1.15
FDC256C type 1.23 1.35
0.025
FDC306C type 1.18 1.30 5 m
(7) (8)
FDC406C type 1.38
(6)
1.55
FDC506C type 1.68 1.85
0.035
FDC506CEM 1.63 1.80
Model
Basic refrigerant
charge amount
(1)
Factory charge amount of refrigerant
Additional
charge amount
(1)
per meter
Outdoor unit
Indoor unit
Length that
additional
charge is not
required
Maximum
piping
length
Unit : kg
Holding
charged
(
)
Hexagon
wrench size
Gas side
FDC206~306
Model
Item
4
4
FDC406, 506
6
4
Liquid side
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