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Application Information M5MSY-2010
VACUUMING AND CHARGING
Purging the piping and the indoor unit
Except for the outdoor unit which is pre-charged with
refrigerant R410A, the indoor unit and the refrigerant
connection pipes must be air-purged because the air
containing moisture that remains in the refrigerant
cycle may cause malfunction of the compressor.
Make sure all pipes are connected securely to the
outdoor and indoor valves.
Remove the caps from the fl are valves and the
service. Take note that there are a total of two
service ports for 5MSY20BR, three service ports for
5MSY25BR and four service ports for 5MSY30BR.
Connect the center of the charging gauge to the
vacuum pump.
Connect the charging gauge to the 3-way valve’s
service port. (The numbers of service ports depend
on the O/D unit model).
Start the vacuum pump. Evacuate for approximately
30 minutes. The evacuation time varies with different
vacuum pump capacity. Confi rm that the charging
gauge needle has moved towards -760mmHg.
Proceed to the next 3-way valve and repeat the
steps above.
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CAUTION
If the gauge needle does not move towards -
760mmHg, be sure to check for gas leaks (using
the refrigerant detector) at fl are type connection
of the indoor and outdoor unit and repair the leak
before proceeding to the next step.
Close the valve of the charging gauge and stop the
vacuum pump.
On the outdoor unit, open the suction valve (3-way)
and liquid valve (2-way) (in anti-clockwise direction)
with 4mm key for hexagon sacked screw.
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Allen key
Service port
Flare nut
Outdoor unit 3 way valve
Refrigerant piping
Hi
Low
Indoor Unit
Liquid side
Outdoor Unit
Close
Close
Gas side
Close
Open
Vacuum
pump
Discharge valve
Suction valve
Additional charge
The refrigerant is pre-charged in the outdoor unit
for specifi c piping length. Please refer to for further
details on additional charge.
Charge operation
This operation must be done by using a cylinder and
a precise weighing machine. The additional charge is
topped up into the outdoor unit using the suction valve
via the service port.
Remove the service port cap.
Connect the low pressure side of the charging gauge
to the suction service port center of the cylinder
tank and close the high pressure side of the gauge.
Purge the air from the service hose.
Start the air conditioner unit.
Open the cylinder and low pressure charging
valve.
When the required refrigerant quantity is pumped
into the unit, close the low pressure side and the
cylinder valve.
Disconnect the service hose from service port. Put
back the service port cap.
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HiLow
Indoor Unit
Liquid side
Outdoor Unit
Open
Open
Gas side
Close
Check
valve
Discharge valve
Suction valve
Open
CAUTION
R410A must be charged as liquid. Usually R410A cylinder is equipped with a dip-pipe for liquid withdrawal.
If there is no dip-pipe, the cylinder should be inverted so as to withdraw liquid R410A from the valve.
Do not top-up when servicing leak, as this will reduce the unit performance. Vacuum the unit thoroughly
and then charge the unit with fresh R410A according to the amount recommended in the specifi cation.
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