250B8W1B
Split system air conditioner
4PW25544-1A
Installation manual
14
Never connect 400 V to the terminal block of the interconnecting
wiring. Doing so will break the entire system.
■
After installing the interconnecting wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing
tape, as shown in the figure below.
■
See the paragraph
"Fixing field line connection" on page 13
9. B
EFORE
OPERATION
9.1.
Service precautions
9.2.
Checks before initial start-up
After the installation, check the following before switching on the
circuit breaker:
1
The position of the switches that require an initial setting
Make sure that switches are set according to your application
needs before turning the power supply on.
2
Power supply wiring and transmission wiring
Use a designated power supply and transmission wiring and
make sure that it has been carried out according to the
instructions described in this manual, according to the wiring
diagrams and according to local and national regulations.
3
Pipe sizes and pipe insulation
Make sure that correct pipe sizes are installed and that the
insulation work is properly executed.
4
Additional refrigerant charge
The amount of refrigerant to be added to the unit should be
written on the included "Added Refrigerant" plate and attached
to the rear side of the front cover.
5
Insulation test of the main power circuit
Using a megatester for 500
V, check that the insulation
resistance of 2 M
Ω
or more is attained by applying a voltage of
500 V DC between power terminals and earth. Never use the
megatester for the transmission wiring.
6
Installation date
For reference, keep record of the installation date on the sticker
on the rear of the upper front panel.
9.3.
Field setting
If required, carry out field settings according to the following
instructions. Refer to the service manual for more details.
Opening the switch box and handling the switches
When carrying out field settings,
remove the inspection cover (1).
Operate the switches with an insulated
stick (such as a ball-point pen) to avoid
touching of live parts.
Make sure to re-attach the inspection cover (1) into the switch box
cover (2) after the job is finished.
Location of the dip switches, leds and buttons
■
Check that wiring lines do not make contact with
refrigerant piping.
■
Firmly close the lid and arrange the electrical wires so
as to prevent the lid or other parts from coming loose.
■
When you don't use a wire conduit, be sure to protect
the wires with vinyl tubes etc, to prevent the edge of
the knock-out hole from cutting the wires.
WARNING: ELECTRIC SHOCK
Caution when performing service to inverter
equipment
■
Do not touch live parts for 10 minutes after the power
supply is turned off because of high voltage risk.
■
Additionally, measure the points as shown in the figure
with a tester and confirm that the voltage of the
capacitor in the main circuit is not higher than
50 V DC.
Then pull out the connector (X1A,X2A on A3P).
Please pay attention not to come in contact with live
parts.
■
After the service is finished, re-connect the connector
(X1A,X2A on A3P). Otherwise malfunction may occur.
Caution when obtaining access to terminals
■
Before obtaining access to terminals in the switch box,
all supply circuits must be disconnected.
■
Be careful when taking off the cover. Touching live
parts may cause electric shock.
■
After servicing is finished, re-attach the cover.
Otherwise malfunction may occur due to intrusion of
water or other foreign materials.
NOTE
Play it safe!
For protection of the PCB, touch the switch box casing
by hand in order to eliminate static electricity from your
body before performing service.
1
2
3
4
5
4
1
Liquid pipe
2
Gas pipe
3
Interconnecting wiring
4
Insulator
5
Finishing tape
TP1 TP2
■
Make sure that the circuit breaker on the power supply
panel of the installation is switched off.
■
Attach the power wire securely.
■
Introducing power with a missing N-phase or with a
mistaken N-phase will break the equipment.
1
Led H1~7P
2
Push button switches
BS1~BS5
3
Dip switch 1 (DS1: 1~8)
2
1
1
2
3
