MCAC-VTSM-2013-12 R410a Full DC Inverter Mini VRF
Installation 87
7. Test Running
Operate according to “key points for test running” on the electric control box cover.
CAUTION
Test running cannot start until the outdoor unit has been connected to the power for 12hours.
Test running cannot start until all the valves are affirmed open.
Never make the test running if the machine has malfunction.
Make sure the communication between the indoor unit and outdoor unit is normal before test running.
8. Precautions on Refrigerant Leakage
This air conditioner (A/C) adopts innocuous and nonflammable refrigerant. The locating room of the A/C should
big enough that any refrigerant leakage is unable to reach critical thickness. So certain essential action can be
taken on time.
Refrigerant critical thickness: 0.44[kg/m
3
] for R410A.
Confirm the critical thickness through follow steps, and take necessary actions.
1. Calculate the sum of the charge volume (A[kg]) Total Refrigerant volume of 10HP=factory refrigerant volume
+ super addition
2. Calculate the indoor cubage (B[m
3
]) (as the minimum cubage.)
3. Calculate the refrigerant thickness
Counter measure against over high thickness
1. Install mechanical ventilator to reduce the refrigerant thickness under critical level. (ventilate regularly)
2. Install leak alarm facility related to mechanical ventilator if you cannot regularly ventilate.
NOTE
Please press “cool” button to carry out refrigerant recycling process. Keep the low pressure above 0.2MPa;
otherwise compressor may be burnt out.
A[kg]
B[m ]
3
critical thickness
b. Leak alarm related to mechanical ventilator
A. Ventilation
peristome
(Leak hunting siren should be installed in
places easily keep refrigerant)
Indoor unit
Outdoor unit
Indoor unit
Room full of leak refrigerant
(All refrigerant has run up)
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