R410A DC Inverter VRF V4 Plus Individual Series 50Hz
MCAC-VTSM-2014-04
76
Installation
Caution:
Don’t mix up the different refrigerants or abuse the tools and measurements which directly contact with refrigerants.
Don’t adopt refrigerant gas for air vacuuming.
If vacuum level could not get to -0.1MPa, please check whether resulted by leakage and confirm the leakage site. If no leakage,
please operate the vacuum pump again 1 or 2 hrs.
12. Additional refrigerant charge
Calculate the additional refrigerant charge according to the diameter and the length of the liquid side pipe of
the outdoor/indoor unit connection. The refrigerant is R410A.
Pipe size of liquid side
Additional refrigerant charge per meter (kg)
Φ6.4
0.022
Φ9.5
0.057
Φ12.7
0.110
Φ15.9
0.170
Φ19.1
0.260
Φ22.2
0.360
Φ25.4
0.520
Φ28.6
0.680
13. Auto judging system refrigerant volume
When all the indoor units are in cooling or heating mode, the system will be in refrigerant volume judgment
mode automatically. If the system judges that the refrigerant volume is normal, the system will operate normally,
no error code will display. If the system judges that the refrigerant volume is abnormal, corresponding error
code will display on digital tube.
When only partial indoor units are in cooling or heating mode, the system will not judge the refrigerant volume
and the digital tube will reserve the last judging result.
Error code
Content
r1
Lack of refrigerant
r2
Obvious lack of refrigerant
r3
Serious lack of refrigerant
R1
Too much refrigerant
R2
Serious too much refrigerant
Connect with vacuum pump
Perform the pump (last for 2 hours or above)
When get the vacuum level
-0.1MPa, the pump should
keep running for 20-60 mins
Shut down the
vaccun pump
Place the vaccum state unused (1 hours or above)
1. Close-off the valve of
vacuum meter.
2. Cut off the connection
between pressure meter
and vacuum pump.
3. Close the vacuum
pump.