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Pump down process
■
1. Turn off the Air Conditioner system.
2. Connect the charge hose from the manifold valve
to the service port of the packed valve at gas side.
3. Turn on the Air Conditioner system in cooling
operation more than 10 minutes.
4. Check the operating pressure of the system should
be normal value.
(Ref. with product specification)
5. Release the valve rod cap of both service valves.
6. Use the Hexagon wrench to turning the valve rod
of Liquid side fully close.
(*Make sure no entering air into the system)
7. Continue operate Air Conditioner system until and
the gauge of manifold dropped into the range of
0.5 - 0 kgf/cm
2
8. Use the Hexagon wrench to turning the valve rod
of Gas side fully close.
And turn off the Air Conditioner system
immediately thereafter.
9. Remove the gauge manifold from the service port
of the packed valve.
10. Securely tighten the valve rod cap to the both
service valves.
CAUTION
Should be check the compressor operating
condition while pumping down process. It must not
any abnormal sound, more vibration. It is abnormal
condition appears and must turn off the
Air Conditioner immediately.
29-EN
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
Ø9.5 mm
Valve size
Ø15.9 mm
Charge port
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.
– 15 –
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.
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.
Indoor unit inspection locations
(piping connections)
Refrigerant
piping
Indoor unit side piping
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.
30-EN
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