Fujitsu AIR CONDITIONER Installation Manual page 6

CONNECTION DIAGRAMS
Outdoor unit side terminal 1 2 3
Demand control
signal transmission cable
Power line
Earth (Ground) line
Indoor unit side terminal
CONNECTION CABLE PREPARATION
30 mm
or more
Earth
(Ground)
cable
Connection cable
Power supply cable
40 mm
or more
CONECTION CABLE WIRING
Run the connection cable to the rear of the outdoor unit
within the "A "range of the arrows shown in the figure.
(The switch cover becomes difficult to install.)
HOLE
Connection and Power
supply cable
Demand control signal
transmission cable
"A"
• Enquiries when testing the operation of the demand control :
Consult Fujitsu General Customer Service and your energy
HOLE provider if you have any operational issues or errors are caused.
Route the demand control signal transmission cable away from the power supply
cable. Adjacent wiring of those cables may lead the product malfunctions caused by
generated noise.
5.5. Connecting the piping
CONNECTION
(1) Install the outdoor unit wall cap (supplied with the optional installation set or pro-
cured at the site) to the wall pipe.
(2) Connect the outdoor unit and indoor unit piping.
(3) After matching the center of the flare surface and tightening the nut hand tight,
tighten the nut to the specified tightening torque with a torque wrench. (Table 1)
FLARING
(1) Cut the connection pipe to the necessary
length with a pipe cutter.
(2) Hold the pipe downward so that cuttings
will not enter the pipe and remove the
burrs.
(3) Insert the flare nut onto the pipe and flare
the pipe with a flaring tool.
Insert the flare nut (always use the flare nut
attached to the indoor and outdoor units
respectively) onto the pipe and perform the flare
processing with a flare tool.
Use the special R410A flare tool, or the R22
flare tool.
When using the conventional flare tool, always
use an allowance adjustment gauge and secure
the A dimension shown in table 2.
BENDING PIPES
(1) When bending the pipe, be careful not to crush it.
(2) To prevent breaking of the pipe, avoid sharp bends.
Bend the pipe with a radius of curvature of 70 mm or over.
(3) If the copper pipe is bend the pipe or pulled to often, it will become stiff. Do not
bend the pipes more than three times at one place.
Holding spanner
Body side
90°
Torque wrench
En-6
R32_outdoor_2版_01_EN.indd 6
EARTH
(GROUND)
1 2 3 L N
C
EARTH
(GROUND)
Earth
(Ground) line
Power supply
1 2 3
30 mm
or more
Demand control
signal transmission
cable
CAUTION
Check if [L] is flared uniformly and
is not cracked or scratched.
Die
A
Pipe
To prevent gas leakage, coat the flare
surface with refrigerator oil.
Table 1 Flare nut tightening torque
Flare nut Diameter (mm) x Torque (N • m)
6.35 mm dia.
9.52 mm dia.
12.70 mm dia.
Table 2 Pipe outside diameter
Pipe outside
Flare tool for R32 or
diameter
R410A, clutch type
ø 6.35 mm (1/4") 0 to 0.5
ø 9.52 mm (3/8") 0 to 0.5
ø 12.70 mm (1/2") 0 to 0.5
CAUTION
Fasten a flare nut with a torque wrench as instructed in this manual. If fastened too
tight, the flare nut may be broken after a long period of time and cause a leakage of
refrigerant.
5.6. Air purge
Always use a vacuum pump to purge the air.
Refrigerant for purging the air is not charged in the outdoor unit at the factory.
Close the high pressure side valve of the gauge manifold fully and do not operate it during
the following work.
CAUTION
Refrigerant must not be discharged into atmosphere.
After connecting the piping , check the joints for gas leakage with gas leak detector.
(1) Check if the piping connections are secure.
(2) Check that the stems of 2-way valve and 3-way valve are closed fully.
(3) Connect the gauge manifold charge hose to the charging port of the 3-way valve (side
with the projection for pushing in the valve core).
(4) Open the low pressure side valve of the gauge manifold fully.
(5) Operate the vacuum pump and start pump down.
(6) Slowly loosen the flare nut of the 3-way valve and check if air enters, then retighten
the flare nut.
(When the flare nut is loosened the operating sound of the vacuum pump changes
and the reading of the compound pressure gauge goes from minus to zero.)
(7) Pump down the system for at least 15 minutes, then check if the compound pressure
gauge reads -0.1 MPa (-76 cmHg, -1 bar).
(8) At the end of pump down, close the low pressure side gauge of the gauge manifold
fully and stop the vacuum pump.
(9) Slowly loosen the valve stem of the 3-way valve. When the compound pressure
gauge reading reaches 0.1-0.2 MPa, retighten the valve stem and disconnect the
charge hose from the 3-way valve charging port.
(If the stem of the 3-way valve is opened fully before the charge hose is disconnect-
ed, it may be difficult to disconnect the charge hose.)
(10) Fully open the valve stems of the 2-way valve and 3-way valve using a hexagon
wrench. (After the valve stem begins to turn, turn it with a torque of less than
2.9 N • m until it stops turning.)
(11) Firmly tighten the 2-way valve and 3-way valve blank cap and the charging port cap.
Compound pressure gauge
2 - way valve
3-way valve
Flare nut
Charging port
Charging port cap
Blank cap (1/4 in.)
Blank cap (3/8 in.)
Blank cap (1/2 in.)
Charging port cap
17 x 16 ~ 18
22 x 32 ~ 42
26 x 49 ~ 61
A (mm)
R22 Flaring tool
Clutch type Wing nut type
1.0 to 1.5 1.5 to 2.0
1.0 to 1.5 1.5 to 2.0
1.0 to 1.5 1.5 to 2.0
Gauge manifold
Pressure gauge
-0.1 MPa
(-76 cmHg
-1 bar)
High
Low pressure
pressure
side valve
side valve
(closed)
Valve stem
Charge
hose
Blank cap
Charge hose
Vacuum pump
Tightening torque
20.0 to 25.0 N • m
20.0 to 25.0 N • m
28.0 to 32.0 N • m
12.5 to 16.0 N • m
2013/07/05 20:50:07