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How to open the valve
Fully open the valves of the outdoor unit. (First fully
open the valve on the liquid side, and then fully open
the valve on the gas side.)
* Do not open or close the valves when the ambient
temperature is -20°C or less. Doing so may damage
the valve O-rings and result in refrigerant leakage.
Liquid side
Open the valve with a 4 mm hexagon wrench.
Gas side
Open the valve with a 5 mm hexagon wrench.
Valve handling precautions
* Open the valve stem until it strikes the stopper.
* Securely tighten the cap with a torque wrench.
Charge port
Cap
Flare nut
Cap tightening torque
4 to 42
Ø9.5 mm
( .4 to 4.2 kgf m)
Valve size
4 to 42
Ø15.9 mm
( .4 to 4.2 kgf m)
14 to 1
Charge port
(1.4 to 1. kgf m)
Valve handling precautions
Open the valve stem until it strikes the stopper.
It is unnecessary to apply further force.
Securely tighten the cap with a torque wrench.
29-EN
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.
Indoor unit inspection locations
(piping connections)
Indoor unit side piping
m
Outdoor unit inspection locations
m
m
– 15 –
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.
Insulate the branch pipes by following the
•
instructions in the installation manual provided with
the branch pipe kit.
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.
Refrigerant
piping
30-EN
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