Daikin VRV IV REYQ-TAYCA, Design Manual

Page: 68 / 80

66
REYQ-TAYCA EDUS371706C-D
24.2 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.
Step1: Calculate the amount of refrigerant (lbs.) 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)
+
Additional charging amount (amount
of refrigerant added locally in
accordance with the length or diameter
of the refrigerant piping)
= Total amount of refrigerant (lbs.)
in the system
Note:
Where a single refrigerant facility is divided into 2 entirely independent refrigerant systems then use the amount of
refrigerant with which each separate system is charged.
Step 2: Calculate the smallest room volume (ft.
3
)
In case like the following, calculate the volume of (a), (b) as a single room or as the smallest room.
(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.
Opening between
rooms
Partition
(Where there is an opening without a door or where there are openings above and below the door which are each equivalent in size to 0.15%
or more of the floor area.)
(c) Where there is a gas leak detection alarm device linked to a mechanical ventilator in the smallest room then the next smallest room will
become the measurement target.