Daikin RXYQ96PYDN Service Manual page 252

SiUS34-801A_b
Maximum concentration level
The maximum charge of refrigerant and the calculation of the maximum concentration of refrigerant
is directly related to the human-occupied space into which it could leak.
The unit of measurement of the concentration is lb/ft
volume of the occupied space).
Compliance to the local applicable regulations and standards for the maximum allowable
concentration level is required.
Pay a special attention to the place, such as a basement, where refrigerant can stay, since
refrigerant is heavier than air.
Procedure for checking maximum concentration
Check the maximum concentration level in accordance with steps 1 to 4 below and take whatever
action is necessary to comply.
1. Calculate the amount of refrigerant (lb) charged to each system separately.
amount of refrigerant in a
single unit system (amount
of refrigerant with which the
system is charged before
leaving the factory)
Note:
2. Calculate the smallest room volume (ft
A. Where there are no smaller room divisions
B. Where there is a room division but there is an opening between the rooms sufficiently large to
permit a free flow of air back and forth.
Where there is an opening without a door or where there are openings above and below the door
that are each equivalent in size to 0.15% or more of the floor area.
VRVIII R-410A Heat Recovery 60Hz
1.direction of the refrigerant flow
2.room where refrigerant leak has occurred (outflow of all the refrigerant from the system)
Where a single refrigerant facility is divided into 2 entirely independent refrigerant systems, use
the amount of refrigerant with which each separate system is charged.
For the following cases, calculate the volume of (A), (B) as a single room or as the smallest
room.
1.opening between rooms
2.partition
3
(the weight in lb of the refrigerant gas in 1 ft
1
2
additional charging amount
+ (amount of refrigerant added
locally in accordance with the
length or diameter of the
refrigerant piping)
3
)
1
2
Test Operation
total amount of
= refrigerant (lb) in
the system
237
3