250B8W1B
Split system air conditioner
4PW25544-1A
Installation manual
10
To avoid compressor breakdown. Do not charge the refrigerant
with more than the specified amount.
■
This outdoor unit is factory charged with refrigerant and
depending on pipe sizes and pipe lengths, some systems
require additional charging of refrigerant. (Refer to
■
Make sure to use installation tools you exclusively use on
R410A installations to withstand the pressure and to prevent
foreign materials from mixing into the system.
■
Charge the refrigerant to the liquid pipe in its liquid state. Since
R410A is a mixed refrigerant, its composition changes if charged
in a state of gas and normal system operation would no longer
be assured.
■
Before charging, check whether the refrigerant cylinder is
equipped with a siphon tube or not.
■
Determine the weight of refrigerant to be charged additionally
referring to the item "Additional refrigerant charge" in
charging weight of the refrigerant (after a leak, etc.)" on page 9
and fill in the amount in the "Additional refrigerant charge label"
attached to the unit.
Charging while the outdoor unit is at standstill
■
After the vacuum drying is finished, charge the additional
refrigerant in its liquid state through the liquid stop valve service
port taking into account following instructions:
-
Check that gas and liquid stop valves are closed.
-
Stop the compressor and charge the specified weight of
refrigerant.
Charging while the outdoor unit is operating
1
Charge refrigerant as much as possible when the power supply
is switched off.
2
Turn the power supply on and charge only the amount of lacking
refrigerant.
3
Completely open the gas line stop valve.
See
"Set up for vacuuming and leak test:"
for nomenclature of the parts in
Valve A must be left fully closed.
Make sure the liquid stop valve is totally shut. If it is open, the
refrigerant cannot be charged.
Charge the additional refrigerant in its liquid state through the
service port of the liquid line stop valve.
4
While the unit is at standstill and under setting mode 2 (refer to
Checks before initial start-up
"Setting the mode 2" on page 15
set the required function A (additional refrigerant charging
operation) to
(ON). Then operation starts. The blinking H2P
led indicates test operation and the remote controller indicates
(test operation).
5
When the specified amount of refrigerant is charged, push the
button. Then operation stops.
■
The operation automatically stops within 30 minutes.
■
If the refrigerant charge cannot be finished within 30 minutes,
repeat step 2.
■
If the operation stops immediately after restart, there is a
possibility that the system is overcharged.
The refrigerant cannot be charged more than this amount.
6
After the refrigerant charge hose is removed, make sure to fully
open the liquid stop valve. Otherwise the piping may burst due to
blocked liquid.
8. F
IELD
WIRING
Charge the liquid
refrigerant with the
cylinder in upright
position.
Charge the liquid
refrigerant with the
cylinder in up-side-down
position.
If the total refrigerant cannot be charged while the outdoor
unit is at standstill, it is possible to charge the refrigerant by
operating the outdoor unit using the refrigerant charge
function (refer to
ON
BS3 RETURN
■
All field wiring and components must be installed by a
licensed electrician and must comply with relevant
local and national regulations.
■
The field wiring must be carried out in accordance
with the wiring diagrams and the instructions given
below.
■
Be sure to use a dedicated power circuit. Never use a
power supply shared by another appliance. This can
lead to electrical shock or fire.
■
Insufficient capacity of the power supply circuit or
improper electrical construction may lead to electric
shocks or fire.
■
Do not operate until refrigerant piping work is
completed.
(If operated before completion of the piping work, the
compressor may break down.)
■
Never remove a thermistor, sensor, etc., when
connecting power wiring and transmission wiring.
(If operated without thermistor, sensor, etc., the
compressor may break down.)
■
The reversed phase protection detector of this product
only works during the initialisation stage after a power
reset.
The reversed phase protection detector is designed to
stop the product in case of an abnormality when the
product is started up.
When the reversed phase protection circuit forced the
unit to stop, check if all phases are existing. If this is
the case, shut off the power supply to the unit and
replace two of three phases. Turn on power again and
start the unit.
■
Reversed phase detection is not performed while the
product is operating.
■
In case of possible reversal of phases after a
momentary black out of power and the power goes on
and off while the product is operating, install a
reversed phase protection circuit on site. Such
situation is not unimaginable when using generators.
Running the product in reversed phase can break the
compressor and other parts.
■
Ground the air conditioner.
Grounding resistance should be according to national
regulations
Do not connect the earth wire to gas or
water pipes, lightning conductor or
telephone earth wire.
Incomplete grounding may cause electric
shocks.
■
Gas pipe.
Ignition or explosion may occur if the gas leaks.
■
Water pipe.
Hard vinyl tubes are not effective grounds.
■
Lightning conductor or telephone ground wire.
Electric potential may rise abnormally if struck by a
lightning bolt.
■
Be sure to install an earth leakage breaker and fuse.
Failure to install an earth leakage breaker may cause
electric shocks and fire.
