Toshiba MCY-MUG0401HSW-E Service Manual page 126

[5] [To determine the limit on the amount of additional refrigerant]
Determine the smallest room area to calculate the total allowable refrigerant charge limit in the system.
The area of the smallest room being served by the system is decided in the following contents to determine
the maximum allowable total charge of the system.
(1) The area of a room can be determined by projecting walls, doors and partitions onto the floor and calculating
from the enclosed area.
(2) Spaces connected by only false ceilings, ductwork, or similar connections shall not be considered a single
space.
(3) If the partition between 2 rooms on the same floor meets certain requirements then the rooms are considered
as one room and the areas of the rooms may be added up. In this way, it is possible to increase the A
used to calculate the maximum allowed charge.
One of the following 2 requirements shall be met to add up room areas.
1) A room on the same floor, connected by a permanent opening that extends to the floor, and is intended for
people to pass through, and can be considered as a single room.
2) Rooms on the same floor that are connected by openings that meet the following conditions can be considered
as one room.
The opening shall consist of two parts to allow air circulation.
≧
• A (a) + A (b) m
min min
2
• Anv ˃ 0.0123 [m ]
min
Front
Space-a (installation space)
Opening part B
≧ 50% Anv
1500 mm
Opening part A
300 mm
Anv
min
200 mm
≧ 50% Anv
≦100 mm
the opening can't be connected to the outdoors.
the opening can't be closed.
the lower opening shall be ≥ 0.012 m² (minimum opening area for natural ventilation [Anv
Areas of openings greater than 300 mm from the floor are not included in the calculation
when determining Anv
min
50% of Anv or more is less than 200 mm from the floor.
min
the bottom of the bottom opening is 100 mm or less from the floor the height of the opening is
For the upper opening :
the opening can't be connected to the outdoors.
the opening can't be closed.
the upper opening shall be ≥ 0.006 m² (50% of Anv
The bottom of the upper opening shall be at least 1500 mm from the floor.
the height of the opening is ≥ 20 mm.
/ (0.25 ˣ LFL ˣ H) = m
c c
≧20 mm
min
≧20 mm
min
.
2
/ 0.04605 (m )
Space-a (installation space)
Floor area : A (a)
min
).
min
125
Side
Space-b (Space to ventilate)
Opening part
B
Floor area : A (b)
min
Opening part
A
]).
min
≧
value
min
20 mm.