eCO2Boost XS 3
11
9.2. CDU connection to the unit coolers
9.1. Piping and vacuuming process
1. Brazing connection pipe
1-1. Check that cabinet EEV is completely opened.
1-2. Before brazing, insert 2bar nitrogen gas flow into pipe for preventing deposition
of any oxide film on the inner surface of the piping, and also avoid heating up
service valve by wet towel cover etc.
1-3. During brazing, be careful for burning insulation and any CDU components.
2. Leakage test
2-1. Power supply on CDU & wait 20 sec for initializing system.
2-2. Charge Nitrogen gas in 80bar or 55bar if using 60bar relief valve.
2-3. Check brazed part using leakage detector or leakage test liquid (formability).
3. Vacuuming
3-1. Set R744(CO
₂
) manifold, vacuuming pump, CO
₂
vessel and CDU service port.
3-2. Connect CO
₂
charge tube, vacuuming tube, and each equipment.
3-3. Check connector and each tube are closed tightly.
3-3. Loose service valve rod in middle position (3 way opening) before vacuuming.
3-4. Vacuuming for 2-3 hours inside pressure keeping -1bar (vacuuming status).
4. Setting parameter value
4-1. Change loop parameter set depending on target evaporating temperature
during vacuuming process (suction pressure default value 3,0MPa).
1.
Remove
process pipe
2. Insert pipe
3. Brazing pipe
9.3. Service valves connexion and handling
1. Untightened
the protection caps
3. Untightened
the compression packing
2. Connect the CDU
to the manifold
Outlet Male G 3/8’’
Example of connexion
Inlet G 3/8’’ female
Outlet
¼
’’ SAE
4. Service valve handling
Condensing unit
Condensing unit
Condensing unit
Piping
Piping
Piping
Pressure
gage
Pressure
gage
Pressure
gage
Valve in “Rear position”.
The pressure gage is
insulated from the circuit.
Valve in “Front position”.
The condensing unit is
insulated from the rest of
the circuit.
Valve in “intermediate
position”.
All outlet communicate.
ON / OFF operation switch
