Toshiba HFCR407C - Charging the system with additional refrigerant

129
17
Refrigerant pipe installation
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 MM-A0224HT MM-A0280HT MM-A0160HX MM-A0224HX MM-A0280HX
MM-A0224CT MM-A0280CT MM-A0160CX MM-A0224CX MM-A0280CX
Charging amount (kg) 15.5 17.0 5.0 7.0 9.0
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
1
: Total length (m) of 6.4 mm-diameter liquid-side pipe
L
2
: Total length (m) of 9.5 mm-diameter liquid-side pipe
L
3
: Total length (m) of 12.7 mm-diameter liquid-side pipe
L
4
: Total length (m) of 15.9 mm-diameter liquid-side pipe
L
5
: Total length (m) of 19.0 mm-diameter liquid-side pipe
L
6
: Total length (m) of 22.2 mm-diameter liquid-side pipe
Example of calculation
MM-A0224HT
∅ 9.5 (10 m)
∅ 9.5 (10 m)
∅ 9.5 (5 m)
∅ 6.4 (5 m)
∅ 9.5 (10 m)
∅ 6.4 (5 m)
∅ 9.5 (10 m)∅ 9.5 (10 m)
Liquid pipe
∅ 12.7 (30 m)
056 028028
056
056
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