Fujitsu B24LDC, Service Instruction

Page: 90 / 91

P/N 9315342195-01
FINISHING
(1) Insulate between pipes.
●
For rear, right, and bottom piping, overlap the connection pipe heat insulation and
indoor unit pipe heat insulation and bind them with vinyl tape so that there is no gap.
●
For left and left rear piping and center piping, butt the connection pipe heat insulation
and indoor unit pipe heat insulation together and bind them with and vinyl tape so that
there is no gap.
●
For left and left rear piping and center piping, wrap the area which accommodates the
rear piping housing section with cloth tape.
●
For left and left rear piping and center piping, bind the connection cord to the top of the
pipe with vinyl tape.
●
For left and left rear piping and center piping, bundle the piping and drain hose to-
gether by wrapping them with cloth tape over the range within which they fit into the
rear piping housing section.
(2 ) T emporarily fasten the connection cor d along the connection pipe with vinyl tape. (Wrap
to about 1/3 the width of the tape from the bottom of the pipe so that water does not enter.)
(3) Fasten the connection pipe to the outside wall with saddles, etc.
(4 ) Fill the gap between the outside wall pipe hole and the pipe with sealer so that rain
water and wind cannot blow in.
(5) Fasten the drain hose to the outside wall, etc.
Pipe
(Saddle)
(Outside wall cap)
(Sealer putty)
(Outdoors)
Left piping
Connection cord
Pipe
Drain hose
For connection from the left rear
Connection cord
Wall pipe
Connection
pipe
Check the following:
GOOD
Lifted up
Saddle
Wave End in water
Wall
Drain hose
BAD
BAD BAD
Drain hose
Pipe
Drain hose
Cloth tape
Wrap with
cloth tape
Overlap the insulation
Bind the pipes together so
that there is no gap.
Connection pipe
(heat insulation)
Vinyl tape
Indoor unit pipe
(heat insullation)
1 2 3 L N
1 2 3 4
Transmitter section
T est run button
45mm
Outdoor unit terminal block Indoor unit terminal block
Connection cord
Earth screw Earth screw
Connection cord
(1) Remove the outdoor unit connector cover.
(2) Bend the end of the cord as shown in the figure.
(3) Connect the end of the connection cord fully into the terminal block.
(4) Fasten the sheath with a cord clamp.
(5) Install the connector cover.
Connection cord wiring
Run the connection cord to the rear of the outdoor unit within the
A
range of the arrows shown in the figure.
(The connector cover becomes difficult to install.)
Connection cord
Control box
LO
HI
Flare nut
3-way valve
-0.1 MPa
(-76 cmHg
-1 bar)
High
pressure
side valve
(closed)
Low pressure
side valve
Blank cap
Charge
hose
Vacuum pump
2-way valve
Valve stem
Charge hose
Charging port cap
Charging port
Gauge manifold
Compound pressure gauge
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.)
OUTDOOR UNIT
OUTDOOR UNIT INSTALLA TION
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.
●
Set the unit on a strong stand, such as one made of concrete blocks
to minimize shock and vibration.
●
Do not set the unit directly on the ground because it will cause trou-
ble.
Connector cover removal
●
Remove the tapping screws.
Installing the connector cover
(1) After inserting the two front hooks, then insert the rear hook.
(2) Tighten the tapping screws.
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 disconnected, 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 (30 kgf•cm) until it
stops turning.)
11.Firmly tighten the 2-way valve and 3-way valve blank cap and
the charging port cap.
CAUTION
(1 ) Re fr ig er an t mu st n ot b e di sc ha rg ed i nt o
atmosphere.
(2 ) After connecting the piping , check the joints for
gas leakage with gas leak detector.
Pressure gauge
OUTDOOR UNIT WIRING
WARNING
(1) Install the unit where it will not be tilted by more
than 5°.
(2) When installing the outdoor unit where it may ex-
posed to strong wind, fasten it securely.
T apping screw
Rear hooks
Connector cover
Front hooks
(1 ) Match the terminal block numbers and connection
cord colors with those of the indoor unit.
Erroneous wiring may cause burning of the electric
parts.
(2 ) Connect the connection cords firmly to the terminal
block. Imperfect installation may cause a fir e.
(3 ) Always fasten the outside covering of the connec-
tion cord with the cord clamp. (If the insulator is
chafed, electric leakage may occur.)
(4) Securely earth the power cord plug.
(5) Do not use th e earth screw for an external connector .
Only use for interconnection between two units.
CAUTION
TEST RUNNING
●
Perform test operation and check items 1 and 2 below.
●
For the test operation method, refer to the operating manual.
●
The outdoor unit, may not operate, depending on the room temperature. In this case, press the test run button on the remote control unit while
the air conditioner is running, (Point the transmitter section of the remote control unit toward the air conditioner and press the test run button
with the tip of a ball-point pen, etc.)
●
T o end test operation, press the r emote control unit STAR T/STOP button.
(When the air conditioner is run by pressing the test run button, the OPERA TION indicator lamp and TIMER indicator lamp will simultaneously
flash slowly.)
1. INDOOR UNIT
(1) Is operation of each button on the remote control unit normal?
(2) Does each lamp light normally?
(3) Do the air flow-direction louver operate normally?
(4) Is the drain normal?
2. OUTDOOR UNIT
(1) Is there any abnormal noise and vibration during operation?
(2) Will noise, wind, or drain water from the unit disturb the neighbors?
(3) Is there any gas leakage?
Tightening torque
Blank cap (2-way valve) 20 to 25 N•m (200 to 250 kgf•cm)
Blank cap (3-way valve) 30 to 35 N•m (300 to 350 kgf•cm)
Charging port cap 10 to 12 N•m (100 to 120 kgf•cm)
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 30 m. If
the units are further apart than this, correct
operation can not be guaranteed.
Additional charge
Refrigerant suitable for a piping length of 15 m is charged in the outdoor
unit at the factory.
When the piping is longer than 15 m, additional charging is necessary.
For the additional amount, see the table below.
Pipe length
Additional refrigerant
20 m
100 g
Between 15 m and 30 m, when using a connection pipe other than
that in the table, charge additional refrigerant with 20g/1 m as the
criteria.
25 m
200 g
30 m
300 g
40mm
40mm
45mm
Sheath Cord clamp
Earth
screw
Cord
clamp
Earth
screw
10cm
5cm