English
5
6. 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) Con-
densation may form on the surface of the insulating material.
〉
〈
Before refrigerant piping work, check which type of refrig-
erant 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 refrig-
erant.
•
Apply ester oil or ether oil around the flare portions
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 refrig-
erant 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.
• 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.
• To prevent flare nut cracking and gas leaks, be sure to use
both a spanner and torque wrench together, as shown in the
drawing below, when connecting or disconnecting pipes to/
from the unit.
• Refer to the 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 the Table 2 for tightening torque.
• Ventilate if refrigerant gas leaks while performing work.
Table 2
NOTE
The flare nuts used must be those included with the
main body.
CAUTION
Over-tightening may damage the flare and cause a refriger-
ant leakage.
Use “ Table 3 ” as a reference if a torque wrench is not available.
Once work is complete, make sure there is no gas leaking. As
the flare nut is tightened with the wrench, the torque will sud-
denly increase. From that position, tighten the nut to the angle
shown on “ Table 3 ”.
• After checking the pipe-connection for gas leakage, be sure
to insulate the liquid and gas piping, referring to the figure
below.
• Wrap the sealing pad (accessory) only around the insulation
for the joints on the gas piping side.
CAUTION
Be sure to insulate any field piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
NOTE
• Attached piping is needed for connecting gas piping of
FXMQ200 · 250M(A)VE, MAV7. Use attached piping accord-
ing to the size of the piping to be connected.
When connecting the included piping, use the included pip-
ing flange hex bolts (2) and spring washers (2).
• Connect refrigerant piping and branching according to the
attached installation manuals that come with the outdoor
unit.
Pipe
size
Tightening torque
Flare
dimensions
A (mm)
Flare shape
φ
6.4
(1/4”)
14.2 – 17.2N·m
8.7 – 9.1
φ
9.5
(3/8”)
32.7 – 39.9N·m
12.8 – 13.2
φ
12.7
(1/2”)
49.5 – 60.3N·m
16.2 – 16.6
φ
15.9
(5/8”)
61.8 – 75.4N·m
19.3 – 19.7
A
45
0
±2
0
R0.4-0.8
90
0
±2
0
Indoor units to be
connected
Gas piping diameter
Liquid piping
diameter
FXMQ200M(A)VE,
MAV7
φ
19.1
Use attached piping.
φ
9.5
FXMQ250M(A)VE,
MAV7
φ
22.2
Use attached piping.
φ
9.5
Small
sealing pad
(accessory)
Insulation for
fitting (accessory)
Gas pipe
Liquid pipe
(for gas line)
Clamp (× 4)
(accessory)
01_EN_3P258319-6F.fm Page 5 Tuesday, June 3, 2014 11:36 AM
