Specifications

860
FDC-HKX
(2) Specification of unit piping (Pipe diameter, Connecting method)
(a) Unit
1) Outdoor unit
(b) Refrigerant connection piping.
Item Gas line Liquid line
Model Pipe diameter Connecting method Pipe diameter Connecting method
22, 28 type φ12.7 (
1
/2 ") φ6.35 (
1
/4 ")
36 type φ12.7 (
1
/2 ") φ6.35 (
1
/4 ")
45 type φ12.7 (
1
/2 ") Flare φ6.35 (
1
/4 ") Flare
56,71,90 type φ15.88 (
5
/8 ") φ9.52 (
3
/8 ")
112,140 type φ19.05 (
3
/4 ") φ9.52 (
3
/8 ")
Item Gas line Liquid line
Model Pipe diameter Connecting method Pipe diameter Connecting method
FDC140 type φ19.05 (
3
/4 ") Flare φ9.52 (
3
/8 ")
FDC224 type φ25.4 (1 ")
Brazing
φ12.7 (
1
/2 ") Flare
FDC280 type φ28.58 (1
1
/8 ") φ12.7 (
1
/2 ")
Unit: mm(in)
φ 6.35(1/4 ") Flare nut 16 ~ 20 N • m (1.6 ~ 2.0 kg • m)
φ 9.52(3/8 ") Flare nut 40 ~ 50 N • m (4 ~ 5 kg • m)
φ 12.7(1/2 ") Flare nut 40 ~ 50 N • m (4 ~ 5 kg • m)
φ 15.88(5/8 ") Flare nut 90 ~ 120 N • m (9 ~ 12 kg • m)
φ 19.05(3/4 ") Flare nut 100 ~ 140 N • m (10 ~ 14 kg • m)
2) Indoor unit
Unit: mm(in)
3) Tightening torque
Electric
wing
Electric
wing
Refrigerant
piping
Electric
wing
Refrigerant
piping
Refrigerant
piping
Brazing
(c) Connection to rear, right and front directions.
1) See page 748 to 749 for locations of connecting holes and service valves.
(3) Precautions on refrigerant piping work for prevention against compressor lock
Compressor trouble including lock and motor burn-out is due to faulty parts but mainly concerned in installation and rerigerant piping
conditions. The precautions for refrigerant piping are as belows.
(a) Be sure to perform brazing while flowing nitrogen.
Taping
(N2)
(Nitrogen)
Use of only nitrogen gas
(N2) is permitted.
Connection to
rear direction
Connection to
left direction
Connection to
front direction
Connection to
lower direction
Connection to
right direction