Fujitsu AU*24LUAR Service Instruction page 116

4
ELECTRICAL WIRING 1. CONNECTION DIAGRAMS
Power supply
WARNING
N
1 Before starting work, check that power is not being Power line
L
supplied to the indoor unit and outdoor unit.
3 3
2 2
2 Match the terminal board numbers and connection
1 1
cord colors with those of the outdoor unit.
Erroneous wiring may cause burning of the electric
parts.
Indoor unit Outdoor unit
side terminal
side terminal
3 Connect the connection cords firmly to the terminal
board. Imperfect installation may cause a fire.
2. CONNECTION CORD PREPARATION
4 Always fasten the outside covering of the connection
Keep the earth wire longer than the other wires.
cord with the cord clamp. (If the insulator is chafed,
electric leakage may occur.)
5 Always connect the ground wire.
Earth wire
HOW TO CONNECT WIRING TO THE
TERMINALS
3. OUTDOOR UNIT
A. For solid core wiring (or F-cable)
CAUTION
(1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip
the insulation to about 25 mm to expose the solid wire.
When connecting the power supply cord, make sure that
(2) Using a screwdriver, remove the terminal screw(s) on the terminal
the phase of the power supply matches with the phase of
board.
the terminal board. If the phases do not match, the
(3) Using pliers, bend the solid wire to form a loop suitable for the
compressor will rotate in reverse and will not be able to
terminal screw.
compress.
(4) Shape the loop wire properly, place it on the terminal board and
tighten securely with the terminal screw using a screwdriver.
(1) Service cover removal
• Remove the two mounting screws.
B. For strand wiring
• Remove the service cover by pushing downwards.
(1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip
• 30,000 BTU/h class
the insulation to about 10 mm to expose the strand wiring.
• 36,000 BTU/h class
(2) Using a screwdriver, remove the terminal screw(s) on the terminal
board.
(3) Using a round terminal fastener or pliers, securely clamp a round
terminal to each stripped wire end.
(4) Position the round terminal wire, and replace and tighten the
terminal screw using a screwdriver.
Round
A. Solid wire B. Strand wire
terminal
Loop Direction of the service
panel removal
Service cover
• 45,000 BTU/h class
Insulation
• 54,000 BTU/h class
Screw with
special washer
Screw with
Round terminal special washer
Terminal Round
Wire
board terminal
Wire
Terminal block
Direction of the service
cover removal
Service cover
5 6
TEST RUN SPECIAL INSTALLATION
SETTING
PUMP DOWN (Refrigerant collecting operation)
CAUTION
Perform the following procedures to collect the refrigerant when moving
Always turn on the power 12 hours prior to the start of the
the indoor unit or the outdoor unit.
operation in order to ensure compressor protection
(1) Press the push-button switch (SW2) on the circuit board once.
1. Make a TEST RUN in accordance with the in- The LED on the circuit board starts flashing (one second ON/one se-
cond OFF). This indicates the start of PUMP DOWN operation.
stallation instruction sheet for the indoor unit.
When the switch is pressed while the compressor is in operation, PUMP
DOWN operation starts automatically.
2. OUTDOOR UNIT LEDS
When the switch is pressed while the compressor is in stop, the com-
pressor starts to operate automatically, and then move on to PUMP
When a malfunction occurs in the outdoor unit, the LED on the circuit
DOWN operation.
board lights to indicate the error. Refer to the following table for the de-
scription of each error according to the LED.
(2) PUMP DOWN operation continues for about 1 minute. When PUMP
DOWN operation is completed, the compressor stops automatically.
LED Error contents
Then close the 2-way valve and 3-way valve immediately.
Communication error
1 flash
(Indoor unit – Outdoor unit) (3) Turn the power off.
2 flash Discharg pipe temperature sensor
3 flash Outdoor heat exchanger temperature sensor
4 flash Outdoor temperature sensor
7 flash Compressor temperature sensor
8 flash Heat sink temperature sensor PUMP DOWN SW (SW2)
9 flash Pressure switch abnormal
12 flash IPM error
13 flash Compressor rotor position cannot detect
14 flash Compressor cannot operate
15 flash Outdoor fan abnormal (upper fan)
16 flash Outdoor fan abnormal (lower fan)
5 sec. ON/
1 sec. OFF Protect operation
repeated
lighting No error
DANGER
This part (Choke coil) generates high voltages.
Never touch this part.
9374995011_IM_back.p65 1
(2) Valve cover removal. (5) Power supply cord and connection cord should be fixed with cable
• Remove the one mounting screw.
clip as shown in the figure.
• Remove the valve cover by sliding upward.
Fill in a gap at the entrance of the cords with insulation (seal).
EARTH
• 30,000 BTU/h class
Valve cover
• 36,000 BTU/h class
EARTH
Hook
Cable clip
(4 places)
(3) Connect the power supply cord and the connection cord to terminal.
(4) Fasten the power supply cord and connection cord with cord clamp.
Control box
Power supply cord
or connection cord
• 45,000 BTU/h class
• 54,000 BTU/h class
Terminal
Power supply cord
Connection cord
(indoor unit and
outdoor unit
connection cord)
Hook
(3 places)
Do not make power supply cord and connection cord come
in contact with valve (Gas).
Power supply cord
Connection cord
Indoor
Hook
unit
(3 places) EARTH
(6) Put the service cover and valve cover back after completion of the
work.
PART NO. 9374995011
Power supply cord and
connection cord
Insulation
(Seal)
Power supply cord and
connection cord
Cable clip
(2 places)
Insulation
(Seal)
CAUTION
Power supply cord
and connection cord
Valve (Gas)
4/19/05, 9:20 AM