Technibel CAFM1V Series Technical Data Manual page 22

2. System Design
2-7. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Table 2-7 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size Amount of refrigerant
ø6.35
ø9.52
Table 2-8 Refrigerant Charge Amount at Shipment (for outdoor unit)
Heat pump unit GRFMI306R5I
(kg)
Cooling only unit
GRFMI306R5I
(kg)
2-8. System Limitations
Table 2-9 System Limitations
Outdoor units (Type)
Number of max. connectable indoor units
Max. allowable indoor/outdoor capacity ratio
2-9. Tubing Length
Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown
in the figure below.
LA
Main tube of unit
1st branch
L3
Unit distribution tube
Note: Do not use commercially available T-joints for the liquid tubing.
* Be sure to use special R410A distribution joints (purchased separately) for outdoor
unit connections and tubing branches.
charge/m (g/m)
26
56
GRFMI406R5
3.5 3.5
GRFMI406R5
3.5 3.5
306 406
6 8
50
L1
L2
LB LC LD
1 2 3
2 - 15
Design of Mini Multiset
Required amount of charge = (Amount of refrigerant
charge per meter of each size of liquid tube × its tube
length) + (...) + (...)
*Always charge accurately using a scale for weighing.
GRFMI506R5
3.5
GRFMI506R5
3.5
506
9
130%
n
H2
n-1
H1
R410A distribution joint
K70A056Z (for indoor unit)
2