How To Calculate The Additional Refrigerant To Be Charged - Daikin VRV REYQ96MTJU Design, Installation & Testing Instruction

Si39-406
7.5

How to calculate the additional refrigerant to be charged

Additional refrigerant to be charged R (lb.)
R should be rounded off in units of 0.1lb..
Note: If a negative result is gotten for R from the formula at right, no refrigerant needs to be added.
*Example for refrigerant branch using refnet joint and refnet header
*Example for refrigerant branch using refnet joint and refnet header
Note: The amount of refrigerant to be added to the unit should be written on the included "Added
Refrigerant" plate and attached to the rear side of the front cover. Refer next page.
General Information
 
Total length (ft.)
 
R=
of liquid piping
×0.074
 
size at φ1/2"
Outdoor unit
b
a
A
f
B1
g
i
h j
( ~ )
BS unit
B1 B4
1 2
Indoor unit ( ~ )
1 8
Cool/Heat selection possible
If the piping lengths
a: φ3/8 × 100ft.
are as at right
b: φ3/8 × 30ft.
c: φ1/4 × 30ft.
{
R= a+b+i × 0.036 + c+d+e+f+g+h+j+k × 0.015
  
Total length (ft.) Total length (ft.)
  
+ +
of liquid piping of liquid piping
×0.036
  
size at φ3/8" size at φ1/4"
REFNET joint (
c d e
C D E
B
n p
l
B2 B3 B4
k r
m o q
3 4 5 6 7
( ~ )
1 6
d: φ1/4 × 30ft. g: φ1/4 × 30ft.
e: φ1/4 × 30ft. h: φ1/4 × 70ft.
f : φ1/4 × 30ft. i : φ3/8 × 30ft.
}
× 1.15 = 11.37 11.4
Appendix


×0.015

~ )
A
E
Cooling only
.
( )
7 6
H1
s
H2
8
j : φ1/4 × 30ft.
k: φ1/4 × 25ft.
107