-
71
-
b) Limit the protrusion height of front side anchor bolts to 15 mm at the maximum.
c) Install the unit firmly so that it does not fall by earthquake and strong wind.
d) Make the concrete foundation by referring the above illustration.
e) Install the unit in level. (The height difference between right and left is within 5 mm.)
f) In an area where temperature drops below zero for several days in a row, install the unit on the concrete base of which
top is elevated by 30mm or more from the ground level (measurement marked with * in the drawing).
(Because of freezing, drain water could otherwise be blocked from running freely).
Piping specification
Maximum one way length
L=50 m or less
Height difference
●
When the position of outdoor unit is higher than that of
the indoor unit, keep the difference H=30 m or less.
●
When the position of outdoor unit is lower than that of the
indoor unit, keep the difference H=15 m or less.
Indoor unit
Outdoor unit
(2)
Refrigerant piping work
Select the piping specification to fit the specification of indoor unit and installation location.
(a)
Decision of piping specification
Unit : mm
Outdoor unit model
Gas pipe
Liquid pipe
FDCVA302HENR
ø 15.88
t1.0
ø 9.52
t0.8
(b)
Points for attention in installing refrigerant piping
1) Use pipes made of the following material
Material: Phosphorus deoxidized copper seamless pipes (C1220T, JIS
H3300)
2) Please dress the refrigerant piping (both gas and liquid pipes) with a heat
insulating material for prevention of dew condensation. Improper heat
insulation incapable of preventing dew condensation can cause the leak-
ing or dripping of water and a resultant soaking of household effects.
3) Use only a good heat insulating material (120
°
C or higher) for heat insu-
lation. A poor heat insulating material offers only poor heat insulation
and can cause cable deterioration.
a) The gas pipes can cause dew condensation during a cooling opera-
tion, which may become drain water causing a water-leak accident,
or a risk of burns during a heating operation, if touched accidentally,
with its surface reaching a high temperature because of discharged
gas flowing inside. So, do not fail to dress it with a heat insulating
material to prevent such mishap.
b) Dress the flare joints of the indoor units with a heat insulating mate-
rial (pipe covers) (for both gas and liquid pipes).
c) Dress both gas and liquid pipes with a heat insulating material. In
doing so, leave no gaps between the pipe and the heat insulating ma-
terial and wrap them, together with the connecting cable, with a dress-
ing tape.
4) When you need to bend a pipe, bend it to the largest possible radius (R100-
R150) permitted. Do not bend a pipe repeatedly in an effort to shape it
appropriately.
5) In laying pipes, take care to avoid debris, chips or water
from entering the piping system.
6) A unit and a refrigerant pipe are to be flare connected.
Flare a pipe after you have attached a flare nut to the pipe.
The dimensions of flaring for R410A are different from
those for the conventional R407C refrigerant. Although
we recommend the use of flare tools developed specifi-
cally for R410A, conventional flare tools can also be used,
if the measurement of protrusion B is adjusted with a pro-
trusion control copper pipe gauge.
7) Tighten a flare joint securely with double spanners. Ob-
serve the following tightening torque values for flare nuts:
8) A branching pipe set (option part supplied separately) and
refrigerant piping should be connected by blazing.
9) In blazing pipes, keep nitrogen gas flowing inside the pipes
so that an oxide film may not form on the inner surfaces
of the pipes.
Exterior tape
Gas piping
Liquid piping
Wires for connecting
indoor and outdoor
units
Insulation
A
B
13.2
19.7
ø9.52
ø15.88
0
-0.4
A
Copper
pipe outer
diameter
Flared pipe end: A (mm)
0~0.5
ø9.52
ø15.88
Copper
pipe outer
diameter
Copper pipe protrusion for flaring: B (mm)
1.0~1.5
With an R410A tool
In the case of a rigid (clutch) type
With a conventional tool
