3
Indoor Floor Area Requirements
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, mc (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
1) Determine Maximum refrigerant charge allowed, mmax
a. Calculate Installation Room Area, Aroom.
b. Based on Table
Ⅰ
, select mmax which corresponds to the calculated Aroom value.
c. If mmax≥mc, the unit can be installed in the installation room with the specified installation height in Table
Ⅰ
and
without additional room area or any additional ventilation.
d. Else, proceed to 2) and 3).
2) Determine Total Floor Area of Aroom and Broom compliance to Amin total
a. Calculate the Broom area adjacent to the Aroom.
b. Determine the Amin total based on the Total Refrigerant Charge, mc from Table
Ⅱ
.
c. The total floor area of both Aroom and Broom must exceed Amin total.
3) Determine Minimum Venting Opening Area, VAmin for natural ventilation
a. From Table
Ⅲ
, calculate mexcess.
b. Then determine VAmin, corresponding to the calculated mexcess for natural ventilation between Aroom and Broom.
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 Aroom and
Broom.
• Bottom opening:
- Must comply to the minimum area requirement of VAmin.
- 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 VAmin.
- 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).
