SYSVRF2 IM

31
Fig.7-1
7.5 Caution on refrigerant leakage
The refrigerant is R410A, which is safe and noncombustible.
The room for the air conditioner should be big enough so that
refrigerant leaks cannot reach critical thickness. You can also
take other corrective measures.
Critical thickness - the max thickness of Freon without any harm
to people. R410A critical thickness is 0.42 kg/m3
Calculate the critical thickness through the following steps.
Calculate the total refrigerant volume (Akg):
Total refrigerant volume (Akg) = refrigerant charging in factory
(displayed on nameplate) + additional charging refrigerant
Calculate the minimum indoor room volume (Bm3)
Calculate the refrigerant thickness as Akg / Bm3 should be less
than 0,42kg/m3.
Outdoor unit
Indoor unit
Room full of leaking refrigerant
(all refrigerant has leaked out)
7.4.2 Commissioning test run of multiple refrigerant system
Once the commissioning test run of each refrigerant system has
been satisfactorily completed as per “Commissioning test run of
single refrigerant system”, run the multiple systems that make up a
project simultaneously and check for any abnormalities.
The test run procedure is as follows:
Open the outdoor unit liquid, gas and oil balance valves.
Turn on the power to the outdoor units.
If manual addressing is being used, set the addresses of each
indoor unit.
Leave the power on for a minimum of 12 hours prior to running
the system to ensure that the crankcase heaters have heated
the compressor oil sufficiently.
Run the system:
Run the system in cooling mode with the following settings:
temperature 17°C; fan speed high.
After one hour, complete the system commissioning report
then check the system parameters using the UP/DOWN
system check button on each outdoor unit’s main PCB.
Run the system in heating mode with the following settings:
temperature 30°C; fan speed high.
After one hour, complete the system commissioning report
then check the system parameters using the UP/DOWN
system check button on each outdoor unit’s main PCB.
1.
2.
3.
4.
5.
a)
b)
c)
d)
1.
2.
3.
Fig.7-2
Indoor unit
OA
a:Ventilation opening
b.
Leak detector alarm for the mechanical
ventilator
Countermeasure against overhigh thickness:
Install a mechanical ventilator to reduce the refrigerant
thickness under a critical level. (ventilate regularly)
Install the leak detector alarm device related to mechanical
ventilator if you cannot regularly ventilate.
1.
2.
This product has the fluorinated gas, it is forbidden to release to
air.
Refrigerant type: R410 A/ Kg
Volume of GWP: 2088 tonnes CO
2 equivalent
GWP=Global Warming Potential
Attention:
Frequency of Refrigerant Leak Checks
1) For equipment that contains fluorinated greenhouse gases in
quantities of 5 tonnes of CO
2 equivalent or more,but of less than
50 tonnes of CO
2 equipment,at least every 12 months, or where
a leakage detection system is installed, at least every 24 months.
2) For equipment that contains fluorinated greenhouse gases in
quantities of 50 tonnes of CO
2 equivalent or more,but of less than
500 tonnes of CO
2 equipment,at least every six months , or
where a leakage detection system is installed, at least every 12
months.
3) This air-conditioning unit is a hermetically sealed equipment
that contains fluorinated greenhouse gases.
Table.7-1
Factory charge / kg tonnes CO2 equivalentModel
8,10,12HP
14,16,18HP
11.00
13.00
22.97
20,22HP
24,26,28HP
30,32HP
17.00
22.00
25.00
35.50
45.94
52.20
27.14