Fujitsu ARA12LATN Service Instruction page 126

4
ELECTRICAL WIRING 1. CONNECTION DIAGRAMS
Power supply
WARNING
N
Power line
1 Before starting work, check that power is not being
L
supplied to all poles of 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
For strand wiring
CAUTION
(1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip
When connecting the power supply cord, make sure that
the insulation to about 10 mm to expose the strand wiring.
(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 a round terminal fastener or pliers, securely clamp a round compressor will rotate in reverse and will not be able to
terminal to each stripped wire end. compress.
(4) Position the round terminal wire, and replace and tighten the
terminal screw using a screwdriver.
(1) Service cover removal
• Remove the two mounting screws.
• Remove the service cover by pushing downwards.
Round
Strand wire
terminal
Screw with
special washer
Screw with
Round terminal special washer
Terminal Round
Wire
board
terminal
Wire
Direction of the service
cover removal
Terminal block Service cover
5 6
TEST RUN SPECIAL INSTALLATION
SETTING
1. Make a TEST RUN in accordance with the in- PUMP DOWN (Refrigerant collecting operation)
stallation instruction sheet for the indoor unit.
Perform the following procedures to collect the refrigerant when moving
the indoor unit or the outdoor unit.
2. OUTDOOR UNIT LEDS
1. When the product is stopped:
When a malfunction occurs in the outdoor unit, the LED on the circuit
board lights to indicate the error. Refer to the following table for the de-
1 Press the PUMP DOWN switch on the outdoor unit.
scription of each error according to the LED.
(The LED on the outdoor unit circuit board starts
flashing (1 sec. ON / 1 sec. OFF repeated).)
LED Error contents
2 The pump down operation (cooling operation)
Communication error
1 flash
begins right away. After operation starts, close the
(Indoor unit – Outdoor unit)
three-way valve (liquid).
2 flash Discharge pipe temperature sensor
3
3 flash Outdoor heat exchanger temperature (OUTLET) sensor After 2 – 3 minutes, operation stops. Close the three-
way valve (gas) within one minute after operations
4 flash Outdoor temperature sensor
stops.
5 flash Outdoor heat exchanger temperature (MID) sensor
4 The LED will go out three minutes after it stops.
6 flash Discharge pipe temperature abnormal
Disconnect the power supply after confirming that
7 flash Compressor temperature sensor
the LED has gone out.
8 flash Heat sink temperature sensor
9 flash Pressure switch abnormal
2. When the product is operating:
10 flash Compressor temperature abnormal
1 Press the PUMP DOWN switch on the outdoor unit.
12 flash IPM error
The LED on the outdoor unit circuit board starts
13 flash Compressor rotor position cannot detect
flashing (1 sec. ON / 1 sec. OFF repeated), and
14 flash Compressor cannot operate operation stops. At this point, recovery has not been
completed, so do not close the three-way valves
15 flash Outdoor fan abnormal (upper fan)
(liquid and gas).
16 flash Outdoor fan abnormal (lower fan)
5 sec. ON/ 2 The pump down operation (cooling operation)
1 sec. OFF Protect operation begins after three minutes. Close the three-way valve
repeated (liquid) after operation starts.
1 sec. ON/
1 sec. OFF PUMP DOWN operation
3 After 2 – 3 minutes, operation stops. Close the three-
repeated
way valve (gas) within one minute after operations
OFF No error
stops.
4 The LED will go out three minutes after it stops.
Disconnect the power supply after confirming that
the LED has gone out.
*When the pump down operation is repeated, temporarily disconnect the
power supply after opening the closed valves (both liquid and gas).
Reconnect the power supply after 2 - 3 minutes and perform the pump
down operation.
*When the start of the operation after pump down operation has been
completed, temporarily disconnect the power supply after opening the
closed valves (both liquid and gas).
Reconnect the power supply after 2 - 3 minutes and be sure to perform a
test operation for cooling.
3-way valve
(Liquid)
3-way valve
(Gas)
9374995066_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
Valve cover
EARTH
Hook
(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
Do not make power supply cord and connection cord come
in contact with valve (Gas).
Terminal
Power supply cord
Connection cord
(indoor unit and
outdoor unit
connection cord)
(6) Put the service cover and valve cover back after completion of the
work.
Hook
(3 places)
Power supply cord
Connection cord
Indoor
unit
EARTH
PUMP DOWN SW (SW2)
DANGER
This part (Choke coil) generates high voltages.
Never touch this part.
PART NO. 9374995066
Power supply cord and
connection cord
Cable clip
(2 places)
Insulation
(Seal)
CAUTION
Power supply cord
and connection cord
Valve (Gas)
1/11/07, 2:21 PM