Daikin FXSQ-TAVJU Series - REFRIGERANT PIPING WORK

EDUS391777-F17 Installation Manual
FXSQ-TAVJU 8
3P184443-13Z
8
English
6. REFRIGERANT PIPING WORK
r For the outdoor unit refrigerant piping, refer to the installa-
tion manual attached to the outdoor unit.
r Carry out insulation of both gas and liquid refrigerant piping
securely. If not insulated, it may cause water leakage. For
gas piping, use insulation material of which heat resistant
temperature is not less than 250°F (120°C).
For use under high humidity, strengthen the insulation ma-
terial for refrigerant piping. If not strengthened, the surface
of insulation material may sweat.
r Before installation work, make sure that the refrigerant is
R410A. (Unless the refrigerant is R410A, the nor mal opera-
VKQPECPPQVDGGZRGEVGF
CAUTION
This air conditioner is a dedicated model for refriger-
ant R410A. Make sure to meet the require ments shown
below and carry out installation work.
r 7UGFGFKECVGFRKRKPIEWVVGTUCPFƃCTKPIVQQNUHQT
R410A.
r 9JGPOCMKPICƃCTGEQPPGEVKQPEQCVVJGƃCTGFKP-
ner surface only with ether oil or ester oil.
r 7UGQPN[VJGƃCTGPWVUCVVCEJGFVQVJGCKTEQPFKVKQP-
GT+HQVJGTƃCTGPWVUCTGWUGFKVOC[ECWUGTGHTKIGT-
ant leakage.
r To prevent contamination or moisture from getting
into the piping, take measures such as pinch ing or
taping the pipings.
&QPQVOKZUWDUVCPEGQVJGTVJCPVJGURGEKƂGFTGHTKI-
erant such as air into the refrigeration circuit.
If the refrigerant leaks during the work, ventilate the
room.
r The refrigerant is pre-charged in the outdoor unit.
r When connecting the pipings to the air conditioner,
make sure to use a spanner and a torque wrench as
shown in Fig. 9.
r (QTVJGFKOGPUKQPQHƃCTGFRCTVCPFVJGVKIJVGPKPI
torque, refer to the Table 2.
r 9JGPOCMKPICƃCTGEQPPGEVKQPEQCVVJGƃCTGFKPPGT
surface only with ether oil or ester oil.
(Refer to Fig. 10)
6JGPVWTPVJGƃCTGPWVVQVKOGUYKVJ[QWTJCPFCPF
screw in the nut.
Torque wrench
Spanner
Flare nut
Union joint
Fig. 9
%QCVVJGƃCTGFKPPGTUWTHCEG
QPN[YKVJGVJGTQKNQTGUVGTQKN
Fig. 10
Table 2
Piping
size
[in. (mm)]
Tightening
torque
[lbf·ft. (N·m)]
Dimension for
RTQEGUUKPIƃCTG
A [in. (mm)]
Flare shape
[in. (mm)]
I 1/4
(6.4)
10.4–12.7
(15.7±1.5)
0.342–0.358
(8.9±0.2)
90°±2°
A
45°±2°
R0.016-0.031
(0.4-0.8)
I 3/8
(9.5)
24.1–29.4
(36.3±3.6)
0.504–0.520
(13.0±0.2)
I 1/2
(12.7)
36.5–44.5
(54.9±5.4)
0.638–0.654
(16.4±0.2)
I 5/8
(15.9)
45.6–55.6
(68.6±6.8)
0.760–0.776
(19.5±0.2)
CAUTION
&QPQVJCXGQKNCFJGTGVQVJGUETGYƂZKPIRCTVQHTGUKP
parts.
If oil adheres, it may weaken the strength of screwed part.
&QPQVVKIJVGPƃCTGPWVUVQQVKIJV
+HCƃCTGPWVETCEMUVJGTGHTKIGTCPVOC[NGCM
r If there is no torque wrench, use Table 3 as a rule of
thumb.
9JGPVKIJVGPKPICƃCTGPWVYKVJCURCPPGTJCTFGTCPF
harder, there is a point where the tightening torque sud-
denly increases.
From that position, tighten the nut additionally at the
angle shown in Table 3.
#HVGTVJGYQTMKUƂPKUJGFEJGEMUGEWTGN[VJCVVJGTGKUPQ
gas leak.
If the nut is not tightened as instructed, it may cause
slow refrigerant leak and result in malfunction (such as
does not cool or heat).
Table 3
Piping size
[in. (mm)]
Tightening
angle
Recommended arm length of
tool used
I 1/4 (6.4) 60°–90° #RRTQZKPOO
I 3/8 (9.5) 60°–90° #RRTQZKPOO
I 1/2 (12.7) 30°–60° #RRTQZKPOO
I 5/8 (15.9) 30°–60° #RRTQZKPOO
CAUTION
+PUWNCVKQPQHƂGNFRKRKPIOWUVDGECTTKGFQWVWRVQVJG
connection inside the casing.
+HVJGRKRKPIKUGZRQUGFVQVJGCVOQURJGTGKVOC[ECWUG
sweating, burn due to touching the piping, electric shocks
QTCƂTGFWGVQVJGYKTKPIVQWEJKPIVJGRKRKPI