51
Indoor floor area requirement
• If the total refrigerant charge in the system is
<
1.84 kg, there is no additional minimum floor area is required.
•
If the total refrigerant charge in the system is ≥1.84 kg, additional minimum floor area complies requirements
described as below:
• Total refrigerant charge in system, m
c
(kg)=Pre-charged refrigerant amount in unit (kg) + Additional refrigerant
amount after installation (kg)
Symbol
Description
Unit
m
c
Total refrigerant charge in system
kg
m
max
Maximum refrigerant charge allowed
kg
m
excess
m
c
-
m
max
kg
H
Installation height
m
VA
min
Minimum ventilation opening area
cm
2
A
room
/B
room
/A
min
Room area
m
2
1) Determine Maximum refrigerant charge allowed, m
max
a. Calculate Installation Room Area, A
room
.
b. Based on Table 1, select m
max
which corresponds to the calculated A
room
value.
c. If m
max
≥m
c
, the unit can be installed in the installation room with the specified installation height in Table 1 and
without additional room area or any additional ventilation.
d. Else, proceed to 2) and 3).
2) Determine Total Floor Area of A
room
and B
room
compliance to A
min
total
a. Calculate the B
room
area adjacent to the A
room
.
b. Determine the A
min
total based on the Total Refrigerant Charge, m
c
from Table 2.
c. The total floor area of both A
room
and B
room
must exceed A
min
total.
3) Determine Minimum Venting Opening Area, VA
min
for natural ventilation
a. From Table 3, calculate mexcess.
b. Then determine VA
min
, corresponding to the calculated mexcess for natural ventilation between A
room
and B
room
.
c. The unit can be installed at specific room only when the following conditions are fulfilled:
• Two permanent openings, one at bottom, another at top, for ventilation purposes are made between A
room
and B
room
.
• Bottom opening:
- Must comply to the minimum area requirement of VA
min
.
- Opening must be located 300mm from the floor.
- At least 50% of required opening area must be 200mm from the floor.
- The bottom of the opening shall not be higher than the point of release when the unit is installed and must
be situated 100mm above the floor.
- Must be as close as possible to the floor and lower than H.
• Top opening:
- The total size of the Top opening must be more than 50% of VA
min
.
- Opening must be located 1500mm above the floor.
• The height of the openings must be more than 20mm.
• A direct ventilation opening to outside is not encouraged for ventilation (the user can block the opening when
it is cold).
