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Charging additional refrigerant
Outdoor unit
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
* R The lengths of the pipes shown in the figures above (Unit: m).
Single
Diameter of connecting pipe
Amount of additional
(liquid side)
refrigerant per meter (g/m)
α
R
Ø6.4
20
Ø9.5
35
Gas leak inspection
Use a leak detector manufactured specially for HFC refrigerant (R32, R410A, R134a, etc.) to perform
the R32 gas leak inspection.
* Leak detectors for conventional HCFC refrigerant (R22, etc.) cannot be used, as the sensitivity drops to
approximately 1/40 when used for HFC refrigerant.
R32 has a high working pressure, so failure to perform the installation work properly may result in gas leaks
such as when the pressure rises during operation. Be sure to perform leak tests on the piping connections.
Figure of Single
Indoor unit
Amount of additional refrigerant (g) =
Amount of refrigerant charged for main pipe
α × (R−20)
α × (R−20)
– 9 –
Insulating the Pipes
The temperatures at both the liquid side and gas side will be low during cooling so in order to prevent
condensation, be sure to insulate the pipes at both of these sides.
Insulate the pipes separately for the liquid side and gas side.
Outdoor unit inspection locations
REQUIREMENT
Be sure to use an insulating material which can withstand temperatures above 120°C for the gas side pipe since
this pipe will become very hot during heating operations.
Valve cover
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