Charging The System With Additional Refrigerant; Calculating The Amount Of Additional Refrigerant Required; Refrigerant In The System When Shipped From The Factory - Toshiba HFCR407C Service Manual

Charging the system with additional refrigerant

Calculating the amount of additional refrigerant required

Refrigerant in the system when shipped from the factory

Outdoor unit model
Charging amount (kg)
When the system is charged with refrigerant at the factory, the amount of refrigerant needed for the pipes at the site is not
included. Calculate the additional amount needed, and add that amount to the system.
Calculation
Calculate the additional refrigerant to be added to the system on the basis of the size of the liquid-side pipes in use at the
site, and their length.
Refrigerant to be added at site =
(length of liquid-side pipe) x (additional amount of refrigerant per meter of liquid-side pipe)
Additional refrigerant R (kg) = (L1 x 0.030kg/m)
L : Total length (m) of 6.4 mm-diameter liquid-side pipe
1
L : Total length (m) of 9.5 mm-diameter liquid-side pipe
2
L : Total length (m) of 12.7 mm-diameter liquid-side pipe
3
L : Total length (m) of 15.9 mm-diameter liquid-side pipe
4
L : Total length (m) of 19.0 mm-diameter liquid-side pipe
5
L : Total length (m) of 22.2 mm-diameter liquid-side pipe
6
Example of calculation
MM-A0224HT
Liquid pipe
∅ 12.7 (30 m)
Liquid pipe:
∅ 6.4 = 5 + 5 = 10 m
∅ 9.5 = 10 + 10 + 10 + 10 + 4 + 10 = 54 m
∅ 12.7 = 30 m
R = (10 m x 0.030 kg/m) + (54 m x 0.065 kg/m) + (30 m x 0.115 kg/m) = 7.26 kg
Refrigerant pipe installation
MM-A0224HT MM-A0280HT
MM-A0224CT MM-A0280CT
15.5 17.0
∅ 9.5 (10 m)
∅ 9.5 (10 m)
∅ 9.5 (10 m) ∅ 9.5 (10 m)
056 056
129
MM-A0160HX MM-A0224HX
MM-A0160CX MM-A0224CX
5.0 7.0
∅ 9.5 (5 m)
∅ 9.5 (10 m)
∅ 6.4 (5 m)
028
056
MM-A0280HX
MM-A0280CX
9.0
∅ 6.4 (5 m)
028
17