Pipe Installation; Selecting The Pipe Material; Pipe Requirement; The Unit - Fujitsu Airstage Uty-Vdgu Installation Manual

4.3.2.3. Pasting Seals to the piping holes
Use the seals (accessories) to cover any
unused piping holes.
4.3.2.4. Mounting Secure Fittings (If Using 1 EEV unit)
Use the 8 screws (accessories) to secure
the secure fittings (accessories).
Tightening torque
7.1 to 24.8 lbf·in
M4 screw
(0.8 to 2.8 N·m)
4.3.2.5. Mounting Secure Fittings (If Using 2 EEV units)
If using 2 EEV units, stacking the 2
kits is recommended.
If stacking 2 EEV units, secure us-
ing the secure fittings (accessories)
and screws (accessories).
Complete the conduit connection of
the back unit, before mounting the
front unit.
4.3.2.6. Installing EEV units
Mount the EEV unit to the wall.
Select the securing method according to the installation environment.
Method 1
Use the 8 screws (accessories) to secure

the unit.

Screws M4 × L16 mm
(accessories)
Installable EEV unit orientations
Installable both indoors and outdoors
A A
B
Installable indoors only
(Cannot be installed outdoors)
A A
B B
En-5
Seal
(accessories)
Seal (accessories)
Secure fitting
(accessories)
Screws M4 × L10 mm
(accessories)
Secure fitting
(accessories)
Screws M4 × L10 mm
(accessories)
Method 2
Mount the 4 anchor bolts (locally pur-
chased) to the wall, and then secure the
unit.
Nuts and washers
(locally purchased)
Orient the arrow upwards
EEV unit inclination limits
B
Prohibited EEV unit orientations
B
A

5. PIPE INSTALLATION

Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant R410A models. Also, when storing the piping, securely seal the openings by
pinching, taping, etc.
While welding the pipes, be sure to blow dry nitrogen gas through them.

5.1. Selecting the pipe material

Do not use existing pipes from another refrigeration system or refrigerant.
Use pipes that have clean external and internal sides without any contamination which
may cause trouble during use, such as sulfur, oxide, dust, cutting waste, oil, or water.
It is necessary to use seamless copper pipes.
Material: Phosphor deoxidized seamless copper pipes
It is desirable that the amount of residual oil is less than 0.004 oz. /100 ft (40 mg /10 m).
Do not use copper pipes that have a collapsed, deformed, or discolored portion (es-
pecially on the interior surface). Otherwise, the expansion valve or capillary tube may
become blocked with contaminants.
Improper pipe selection will degrade performance. As an air conditioner using R410A
incurs pressure higher than when using conventional (R22) refrigerant, it is necessary to
choose adequate materials.
• Thicknesses of copper pipes used with R410A are as shown in the table.
• Never use copper pipes thinner than those indicated in the table even if they are avail-
able on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Outside diameter [in (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
7/8 (22.22)
1-1/8 (28.58)
*1: Endurance pressure of the pipes 609 psi (4.2 MPa)
*2: Allowable tensile stress ≥ 33 N/mm²
*3: Allowable tensile stress ≥ 61 N/mm²
Please select the pipe size in accordance with local rules.

5.2. Pipe requirement

Use pipe with water-resistant heat insulation.
Refer to the installation manual of the outdoor unit for description of the length of con-
necting pipe or for difference of its elevation.
Install heat insulation around both the gas and liquid pipes. Failure to do so may cause
water leaks. Use heat insulation with heat resistance above 248°F (120°C). (Reverse
cycle model only)
In addition, if the humidity level at the installation location of the refrigerant piping is
±10° or
expected to exceed 70 %, install heat insulation around the refrigerant piping. If the ex-
less
pected humidity level is 70 to 80 %, use heat insulation that is 9/16 in (15 mm) or thicker
and if the expected humidity exceeds 80 %, use heat insulation that is 13/16 in (20 mm)
or thicker. If heat insulation is used that is not as thick as specified, condensation may
form on the surface of the insulation.
In addition, use heat insulation with heat conductivity of 0.045 W/(m·K) or less (at 68°F
(20°C)).
±10° or
less
PROHIBITED
B
B
A
A
CAUTION
CAUTION
Wall thickness [in (mm)] (*1)
0.032 (0.80)
0.032 (0.80)
0.032 (0.80)
0.039 (1.00)
0.047 (1.20)
0.039 (1.00)
0.039 (1.00)
CAUTION
B
A
Material
COPPER
JIS H3300 C1220T-O
or equivalent (*2)
COPPER
JIS H3300 C1220T-H
or equivalent (*3)