Connecting Up And Purging The Circuit - Samsung RJ040F2HX Series Installation Manual

A C onnecting up and purging the circuit
WARNING
When installing, make sure there is no leakage. When recovering the refrigerant, ground the compressor first before
removing the connection pipe. If the refrigerant pipe is not properly connected and the compressor works with the service
valve open, the pipe inhales the air and it makes the pressure inside of the refrigerant cycle abnormally high. It may cause
explosion and injury.
The outdoor unit is loaded with sufficient R410A refrigerant.Do not vent R-410A into atmosphere: it is a fluorinated greenhouse
gas, covered by Kyoto Protocol, with a Global Warming Potential (GWP) = 1975.
You should purge the air in the indoor unit and in the pipe.
If air remains in the refrigerant pipes, it affects the compressor. It may cause reduction of cooling capacity and malfunction.
Refrigerant for air purging is not charged in the outdoor unit. Use Vacuum Pump as seen in the picture.
RJ040F2HX ** /RJ050F2HX ** /RJ052F3HX ** /AJ040FCJ2 ** /
AJ050FCJ2 ** /AJ052FCJ3 **
1 Check the piping connections.
2 Connect the charging hose of low pressure side of manifold gauge to
the packed valve having a service port (RJ040F2HX ** /AJ040FCJ2 ** :
3/8" service valve 2EA; RJ050F2HX ** /AJ050FCJ2 ** : 3/8" service valve
1EA+1/2" service valve 1EA; RJ052F3HX ** /AJ052FCJ3 ** : 3/8" service
valve 2EA+1/2" service valve 1EA) as shown at the figure.
WARNING
Make the electrical connection and leave the system into "stand by
mode". Do not turn on the system! This is necessary for better
vacuum operation (full OPEN position of Electronic Expansion
Valve - EEV -).
3 Open the valve of the low pressure side of manifold gauge
counter-clockwise.
4 Purge the air from the system using vacuum pump for about 10
minutes.
- Close the valve of the low pressure side of manifold gauge clockwise.
- Make sure that pressure gauge show -0.1MPa(-76cmHg) after about 10
minutes.
This procedure is very important in order to avoid gas leak.
- Turn off the vacuum pump
- Remove the hose of the low pressure side of manifold gauge.
5 Set valve cork of both liquid side and gas side of packed valve to
the open position.
6 Mount the valve stem nuts and the service port cap to the valve,
7 Check for gas leakage.
- At this time, especially check for gas leakage from the 3-way valve's stem
nuts, and from the service port cap.
Indoor
A-unit
Indoor
B-unit
Vacuum
Pump
Valve stem
Stem cap
Service port
19