To Perform Vacuum Drying; Charging Refrigerant; About The Refrigerant; To Determine The Additional Refrigerant Amount - Daikin R32 Split Series Installation Manual

1 Charge the system with nitrogen gas up to a gauge pressure of
at least 200 kPa (2 bar). It is recommended to pressurize to
3000 kPa (30 bar) in order to detect small leaks.
2 Check for leaks by applying the bubble test solution to all
connections.
3 Discharge all nitrogen gas.
5.3.2

To perform vacuum drying

1 Vacuum the system until the pressure on the manifold indicates
−0.1 MPa (−1 bar).
2 Leave as is for 4-5 minutes and check the pressure:
If the pressure...
Does not change
Increases
3 Vacuum the system for at least 2 hours to a manifold pressure
of −0.1 MPa (−1 bar).
4 After turning the pump OFF, check the pressure for at least
1 hour.
5 If you do NOT reach the target vacuum or CANNOT maintain
the vacuum for 1 hour, do the following:
▪ Check for leaks again.
▪ Perform vacuum drying again.
NOTICE
Be sure to open the gas stop valve after piping installation
and vacuuming. Running the system with the valve closed,
the compressor may break down.
6

Charging refrigerant

6.1

About the refrigerant

This product contains fluorinated greenhouse gases. Do NOT vent
gases into the atmosphere.
Refrigerant type: R32
Global warming potential (GWP) value: 675
NOTICE
Applicable legislation on fluorinated greenhouse gases
requires that the refrigerant charge of the unit is indicated
both in weight and CO
2
Formula to calculate the quantity in CO
tonnes: GWP value of the refrigerant × total refrigerant
charge [in kg] / 1000
Please contact your installer for more information.
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
WARNING
The appliance shall be stored in a room without
continuously operating ignition sources (example: open
flames, an operating gas appliance or an operating electric
heater).
2MXM68+3(A)MXM+3(A)MXF+4MXM+5MXM
R32 Split series
3P600450-1D – 2020.08
Then...
There is no moisture in the
system. This procedure is
finished.
There is moisture in the
system. Go to the next step.
equivalent.
equivalent
2
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Do NOT use cleaning materials or means to accelerate
the defrosting process other than those recommended
by the manufacturer.
▪ Be aware that the refrigerant inside the system is
odourless.
WARNING
The refrigerant inside the unit is mildly flammable, but
normally does NOT leak. If the refrigerant leaks in the
room and comes in contact with fire from a burner, a
heater, or a cooker, this may result in fire, or the formation
of a harmful gas.
Turn off any combustible heating devices, ventilate the
room, and contact the dealer where you purchased the
unit.
Do NOT use the unit until a service person confirms that
the part from which the refrigerant leaked has been
repaired.
WARNING
NEVER directly touch any accidental leaking refrigerant.
This could result in severe wounds caused by frostbite.
6.2 To determine the additional
refrigerant amount
If the total liquid
piping length is...
≤30 m Do NOT add additional refrigerant.
>30 m R=(total length (m) of liquid piping–
30 m)×0.020
R=Additional charge (kg) (rounded in units
of 0.1 kg)
INFORMATION
Piping length is the one-way length of liquid piping.
INFORMATION
Additional refrigerant charge is NOT allowed in case of
combination of the outdoor unit 3MXM40N8 or 3MXM52N8
with the indoor units CVXM-A and/or FVXM-A. The total
piping length MUST be ≤30 m.
Maximum allowable refrigerant charge amount
3MXM40, 3MXM52, 3AMXM52, 3MXF52, 3AMXF52
3MXM68, 3MXF68, 2MXM68
4MXM68
4MXM80
5MXM90
6.3 To determine the complete
recharge amount
INFORMATION
If a complete recharge is necessary, the total refrigerant
charge is: the factory refrigerant charge (see unit name
plate) + the determined additional amount.
6 Charging refrigerant
Then...
2.2 kg
2.4 kg
2.6 kg
3.2 kg
3.3 kg
Installation manual
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