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Field Piping and Wiring
Si21-205
44
Field Piping and Wiring
1.3
Refrigerant Piping, Drain Piping, and Wiring for FHQ
Model
1.3.1 Refrigerant Piping Work
〈
For refrigerant piping of outdoor units, see the installation manual attached to the
outdoor unit.
〉
〈
Execute heat insulation work completely on both sides of the gas piping and the liquid
piping. Otherwise, a water leakage can result sometimes.
〉
(
When using a heat pump, the temperature of the gas piping can reach up to approximately
120˚C, so use insulation which is sufficiently resistant.)
〈
Also, in cases where the temperature and humidity of the refrigerant piping sections
might exceed 30˚C or RH80 %, reinforce the refrigerant insulation. (20 mm or thicker)
Condensation may form on the surface of the insulating material.
〉
〈
Before refrigerant piping work, check which type of refrigerant is used. Proper operation
is not possible if the types of refrigerant are not the same.
〉
Caution
Use a pipe cutter and flare suitable for the type of refrigerant.
Apply ester oil or ether oil around the flare section before connecting.
To prevent dust, moisture or other foreign matter from infiltrating the tube, either
pinch the end or cover it with tape.
Do not allow anything other than the designated refrigerant to get mixed into the
refrigerant circuit, such as air, etc. If any refrigerant gas leaks while working on the
unit, ventilate the room thoroughly right away.
•
The outdoor unit is charged with refrigerant.
•
Use copper alloy seamless pipes (ISO
1337).
•
Be sure to use both a spanner and torque
wrench together, as shown in the drawing,
when connecting or disconnecting pipes to/
from the unit. (Refer to Fig. 10)
•
Refer to “Table 2” for the dimensions of
flare nut spaces.
•
When connecting the flare nut, coat the
flare section (both inside and outside) with
ester oil or ether oil, rotate three or four
times first, then screw in. (Refer to Fig. 11)
Note:
Use the flare nut included with the unit main body.
Table 2
•
Refer to “Table 2” to determine the proper tightening torque.
Caution
Overtightening may damage the flare and cause a refrigerant leakage.
Ester oil or ether oil
Torque wrench
Flare nut
Piping union
Spanner
Fig. 10
Fig. 11
Type of refrigerant
Applicable model
Flare dimensions A (mm)
R22, R407C
FH(Y)-BJV1
FHYP-BV1, FH-BZV1
R410A
FHQ-BUV1B
Pipe size Tightening torque
R0.4-0.8
A
90
0
±0.5
0
45
0
±
52
0
14.2-17.2 N • m (144-175kgf • cm)
32.7-39.9 N • m (333-407kgf • cm)
49.5-60.3 N • m (505-615kgf • cm)
61.8-75.4 N • m (630-769kgf • cm)
97.2-118.8 N • m (991-1211kgf • cm)
φ
6.4(1/4”)
φ
9.5(3/8”)
φ
12.7(1/2”)
φ
15.9(5/8”)
φ
19.1(3/4”)
Flare
8.6 – 9.0
12.6 – 13.0
15.8 – 16.2
19.0 – 19.4
23.3 – 23.7
8.7 – 9.1
12.8 – 13.2
16.2 – 16.6
19.3 – 19.7
Summary of Contents for Sky Air B-Series R-410A
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Page 15: ...Models Si21 205 4 Model Name and Power Supply ...
Page 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
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Page 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Page 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Page 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Page 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...