Outdoor Unit Wiring; Operating Range; Connecting The Piping; Air Purge - Fujitsu aou18rlfc Installation Manual

OUTDOOR UNIT WIRING

(1) Remove the tapping screw, then remove the control box cover.
(2) Fasten the Inter-unit wire harness and power supply to the conduit holder using the lock nut.
(3) Connect inter-unit wire harness and power supply to the terminal.
(4) Use the tapping screw to install the control box cover.
WARNING
Be sure to comply with local codes while running the wire from the in-
door unit to the outdoor unit (size of wire and wiring method, etc.).
Every wire must be connected fi rmly.
No wire should be allowed to touch refrigerant tubing, the compressor
or any moving part.
Loose wiring may cause the terminal to overheat or result in unit
malfunction. A fi re hazard may also exist. Therefore, be sure all wiring
is tightly connected.
Connect wires to the matching numbers of terminals.
Outdoor unit
Indoor unit Earthing
Terminal (Grounding) Terminal
line
G G
G
L2
Control line
L1
3 3
2 2
1 1
DISCONNECT
(Inter Unit)
SWITCH (FIELD SUPPLY)
Power line
Indoor unit terminal block
Earth
1 2 3 4
(Ground) screw
G
HOW TO CONNECT THE WIRE TO THE TERMINALS
(1) Use crimp-type terminals with insulating sleeves as shown in
the fi gure below to connect to the terminal block.
(2) Securely crimp the crimp-type terminals to the wires using an
appropriate tool so that the wires do not come loose.
(3) Use the specified wires, connect them securely, and fasten
them so that there is no stress placed on the terminals.
(4) Use an appropriate screwdriver to tighten the terminal screws.
Do not use a screwdriver that is too small, otherwise, the screw
heads may be damaged and prevent the screws from being
properly tightened.
(5) Do not tighten the terminal screws too much, otherwise, the
screws may break.
(6) See the table below for the terminal screw tightening torques.
Tightening torque [N·m ( lbf·in )]
M4 screw 1.2 to 1.8 (11 to 16 )
M5 screw 2.0 to 3.0 (18 to 27 )
(1) Match the terminal block numbers and connection cable colors with those of the indoor unit.
Erroneous wiring may cause burning of the electric parts.
(2) Connect the connection cables fi rmly to the terminal block. Imperfect installation may cause a fi re.
(3) Securely earth (ground) the power cable.
(4) Do not use the earth (ground) screw for an external connector. Only use for interconnection between two units.

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.
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 fl are nut of the 3-way valve and check if air enters, then
retighten the fl are nut.
(When the fl are 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 (30 in.Hg ).
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 pres-
sure gauge reading reaches 0.1-0.2 MPa (14.5~28.9 psi), 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 disconnected, it may be diffi cult to disconnect the charge hose.)
Additional charge
Refrigerant suitable for a piping length of 49 ft (15 m) is charged in the
outdoor unit at the factory.
When the piping is longer than 49 ft (15 m), additional charging is necessary.
For the additional amount, see the table below.
Pipe length 49 ft (15 m) 66 ft (20 m)
Additional refrigerant None +3.5 oz (+100 g) 0.2 oz/ft (20 g/m)
NOTE:
• Connector trade size for this unit is 1/2"(12.7 mm). The con-
nector can be bought at a hard ware store. Refer to "How
to connect wiring to the terminals" for instructions on con-
necting depending on the wire type you are using.
• The fuse located in the outdoor unit provides power supply
protection and may blow when power is applied if the system
has been in correctly wired.
Lock nut
Control box cover
Tapping screw
Conduit connector
Power supply
Inter-unit wire
harness
Outdoor unit terminal block
Earth
1 2 3 L1 L2
G
(Ground) screw
Connection cable
G
Power supply cable
Strip
10 mm Crimp-type terminal
(13/32 in.)
Screw with special washer
Wire
Crimp-type terminal
Terminal board
Terminal block
Screw with special washer
Crimp-type terminal
Wire
CAUTION
CAUTION
(1) Refrigerant must not be discharged into atmosphere.
(2) After connecting the piping, check the joints for gas
leakage with gas leak detector.
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 (30 kgf • cm) until it stops turning.)
11. Firmly tighten the 2-way valve and 3-way valve blank cap and the charg-
ing port cap.
Gauge manifold
Compound pressure gauge
-0.1 MPa
3-way valve 2-way valve (30 in.Hg )
Flare nut
Low pressure
side valve
Valve stem
Blank cap
Charge hose
Charging port
Charging port cap
Tightening torque [N m (lbf
•
Blank cap 6.35 mm (1/4 in.)
20 to 25 (14.8 to 18.4)
9.52 mm (3/8 in.)
12.70 mm (1/2 in.) 28 to 32 (20.7 to 23.6)
Charging port cap 10 to 12 (7.4 to 8.8)
CAUTION
(1) When adding refrigerant, add the refrigerant from the charging
port at the completion of work.
(2) The maximum length of the piping is 66 ft (20 m). If the
units are further apart than this, correct operation can not
be guaranteed.
Rate
Between 49 ft (15 m) and 66 ft (20 m), when using a connection pipe
other than that in the table, charge additional refrigerant with 0.2 oz/ft
(20 g/m) as the criteria.
PUMP DOWN OPERATION (FORCED COOLING OPERATION)
To avoid discharging refrigerant into the atmosphere at the time of relocation or disposal, recover refrigerant by doing the cooling operation or
forced cooling operation according to the following procedure. (When the cooling operation cannot start in winter, and so on, start the forced
cooling operation.)
(1) Do the air purging of the charge hose by connecting the charging hose of gauge manifold to the charging port of 3 way valve and opening
the low-pressure valve slightly.
(2) Close the valve stem of 2 way valve completely.
(3) Start the cooling operation or following forced cooling operation.
Keep on pressing the MANUAL AUTO button of the indoor unit for more than 10 seconds.
The operation indicator lamp and timer indicator lamp will begin to fl ash simultaneously during test run.
(The forced cooling operation cannot start if the MANUAL AUTO button is not kept on pressing for more than 10 seconds.)
(4) Close the valve stem of 3 way valve when the reading on the compound pressure gage becomes 0.05~0 MPa (7.25~0 psi).
(5) Stop the operation.
• Press the START/STOP button of the remote control unit to stop the operation.
• Press the MANUAL AUTO button when stopping the operation from indoor unit side.
(It is not necessary to press on keeping for more than 10 seconds.)
During the pump-down operation, make sure that the compressor is turned off before you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2 way or 3 way valve open. This may cause abnormal pres-
sure in the refrigeration cycle that leads to rupture and even injury.

OPERATING RANGE

Cooling/Dry Mode
Outdoor temperature About 14 to 115 °F ( -10 to 46 °C)

CONNECTING THE PIPING

CONNECTION
(1) Install the outdoor unit wall cap (supplied with the optional installation set
or procured at the site) to the wall pipe.
(2) Connect the outdoor unit and indoor unit piping.
(3) After matching the center of the fl are surface and tightening the nut hand
tight, tighten the nut to the specifi ed tightening torque with a torque wrench.
(Table 1)
FLARING
(1) Cut the connection pipe to the necessary
length with a pipe cutter.
Sleeve
(2) Hold the pipe downward so that cuttings will
not enter the pipe and remove the burrs.
(3) Insert the fl are nut onto the pipe and fl are
the pipe with a fl aring tool.
Insert the fl are nut (always use the fl are nut
attached to the indoor and outdoor units re-
spectively) onto the pipe and perform the fl are
processing with a fl are tool.
Use the special R410A fl are tool, or the con-
ventional (for R22) fl are tool.
When using the conventional fl are 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 2-13/16° (70mm) 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.
3
Pressure gauge
High
pressure
side valve
(closed)
Charge
hose
Vacuum pump
ft)]
•
4
CAUTION
Heating Mode
About -5 to 75 °F ( -21 to 24 °C)
Tighten with two wrenches.
Wrench (fi xed)
Flare nut
Torque
wrench
Connection pipe
Indoor unit pipe
Table 1 Flare nut tightening torque
Check if [L] is fl ared uniformly
and is not cracked or scratched. Flare nut [mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
Table 2 Pipe outside diameter
Pipe outside
Flare tool for
diameter
R410A, clutch type
[mm (in.)]
Die
6.35 (1/4)
A
9.52 (3/8) 0 to 0.5 (0 to 1/32)
12.70 (1/2)
Pipe
(1) Fasten a fl are nut with a torque wrench as instructed in this manual. If
fastened too tight, the fl are nut may be broken after a long period of time
and cause a leakage of refrigerant.
(2) During installation, make sure that the refrigerant pipe is attached fi rmly
before you run the compressor. Do not operate the compressor under the
condition of refrigerant piping not attached properly with 2-way or 3-way
valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to rupture and even injury.
To prevent gas leakage, coat the fl are
surface with refrigerator oil.
Tightening torque [N • m (lbf • ft)]
16 to 18 (11.8 to 13.3)
32 to 42 (23.6 to 31.0)
49 to 61 (36.1 to 45.0)
A [mm (in.)]
Conventional (R22) fl are tool
Clutch type Wing nut type
0.5 to 1.5 (1/32 to 2/32) 1.5 to 2.0 (2/32 to 3/32)
CAUTION