Charging Refrigerant - EQUATION EQ3-9K Manuel D'installation

Read before installation
Air Tightness Test
No changes from the conventional method. Note that a refrigerant leakage detector for R22 or R410A cannot detect R32 leakage.
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Items to be strictly observed :
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1 - Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment's air tightness, taking temperature
variations into account.
2 - When investigating leakage locations using a refrigerant, be Sure to Use R32 .
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3 - Ensure that R32 is in a liquid state When charging.
Reasons :
1 - Use of Oxygen as the pressurize gas may cause an explosion.
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2 - Charging with R32 gas will lead the composition of remaining refrigerant in the cylinder to change and then this refrigerant can not be
used.
Vacuuming
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1 - Vacuum pump with check valve
A Vacuum pump with check valve is required to prevent the vacuum pump oil from flowing back into the refrigerant circuit when the
vacuum pump power is turned off (power failure). It is also possible to attach a check valve to the actual Vacuum pump afterwards.
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2 - Standard degree of vacuum for the vacuum pump
Use a pump Which reaches 65Pa or below after 5 minutes of operation.
In addition, be sure to Use a vacuum pump that has been properly maintained and oiled using the specified oil. If the vacuum pump is
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not properly maintained, the degree of Vacuum may be too low.
3 - Required accuracy of the vacuum gauge
Use a vacuum gauge that can measure up to 650Pa.Do not use a general gauge manifold since it cannot measure a vacuum of 650Pa.
4 - Evacuating time
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Evacuate the equipment for 1 hour after 650Pa has been reached.
After evacuating, leave the equipment for 1 hour and make sure the that vacuum is not lost.
5 - Operating procedure when the vacuum pump is stopped
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In order to prevent a backflow of the vacuum pump oil, open the relief valve on the vacuum pump side or loosen the charge hose to
drawn in air before stopping operation. The same operating procedure should be used when using a vacuum pump with a check valve.

Charging Refrigerant

R32 must be in a liquid state when charging.
Reasons :
R32 is a HFC refrigerant (boiling point = -52°C ) and can roughly be handled in the same way as R410A;however, be sure to fill the refrige-
rant from the liquid side, for doing so from the gas side will somewhat change the composition of the refrigerant in the cylinder.
Note
In the case of a cylinder with a syphon, liquid R32 is charged without turning the cylinder up side down. Check the type of cylinder before
charging.
Remedies to be taken in case of a refrigerant leak
When refrigerant leaks, additional refrigerant may be charged. (Add the refrigerant from the liquid side)
Characteristics of the Conventional and the New Refrigerants
• Because R32: is a simulated azeotropic refrigerant, it can be handled in almost the same mammer as a single refrigerant such as R22.
However, if the refrigerant is removed in the vapor phase, the composition of the refrigerant in the cylinder will somewhat change.
• Remove the refrigerant in the liquid phase. Additional refrigerant may be added in case of a refrigerant leak.
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Halide torch R22 or R407C leakage detector