Installation manual
10
250C7Y1B
Split system air conditioner
4PW34720-1G – 07.2010
Total charging weight of the refrigerant (after a leak,
etc.)
The total charging amounts relate to the refrigerant piping length as
in
"Maximum total one way piping length"
of the table in paragraph
"7.4. Allowable pipe length and height difference" on page 5
, the
factory charging amount is mentioned on the nameplate label.
For the total charging amount refer to the additional refrigerant
charge sticker mounted on the unit.
Precaution for pumping-down operation
Take the following steps to perform the pumping-down operation.
This is the end of pumping-down operation. After pumping-down
operation, the remote controller can show the following pattern:
-
"
U4
"
-
blank screen
-
indoor fan operates for about 30 seconds
Even when ON button on the remote controller is pressed, it will not
operate. Turn off the main power supply switch and turn it on again in
need of operation.
Be sure to re-open stopvalves before re-starting the unit operation.
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
"Additional
refrigerant charge" on page 8
).
■
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
"Total
charging weight of the refrigerant (after a leak, etc.)" on page 10
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
figure 15
and refer to
"Airtightness test and vacuum drying"
on page 7
for nomenclature of the parts in
figure 15
.
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.
Procedure
Precaution
1
Stop the unit from operating.
Use the remote controller.
2
Put a pressure gauge at the
service port of the gas stop
valve.
Use a pressure gauge
reserved for R410A
exclusively.
3
Close the stop valve on the
liquid side securely and open
the the gas side completely.
Insecure closing of the valve
may result in burning of the
compressor.
4
Start the fan operation with the
remote controller.
Confirm that the stop valve:
• on the liquid is closed
• on the gas side is open.
5
Push the pumping-down
button (BS5) on the PC board
of the outdoor unit for more
than 5 seconds.
The H2P LED will flash.
Compressor and outdoor fan
will start operation
automatically.
If step 5 is performed before
step 4, then the indoor fan
may automatically start
running. Please pay attention
to this.
6
Continue operation (automatic
operation) for a maximum of
20 minutes.
—
7
The unit stops working. At this
time, close the stop valve on
the gas side.
—
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
"Setting mode 2" on page 17
).
ON
BS3 RETURN
