Service manual

114

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

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)

: Total length (m) of 6.4mm-diameter liquid-side pipe

: Total length (m) of 9.5mm-diameter liquid-side pipe

: Total length (m) of 12.7mm-diameter liquid-side pipe

: Total length (m) of 15.9mm-diameter liquid-side pipe

: Total length (m) of 19.0mm-diameter liquid-side pipe

: Total length (m) of 22.2mm-diameter liquid-side pipe

Example of calculation

Outdoor unit Model

MM-A0224HT MM-A0280HT MM-A0160HX MM-A0224HX MM-A0280HX

Charging amount (kg) 15.5 17.0 5.0 7.0 9.0

Ø9.5 (10m)

Liquid pipe

Ø12.7 (30m)

Ø9.5 (10m)

Ø9.5 (5m)

Ø6.4 (5m)

056 056 028 056 028

Liquid pipe:

Ø6.4 = 5 + 5 = 10m

Ø9.5 = 10 + 10 + 10 + 10 + 4 + 10 = 54m

Ø12.7 = 30m

R = (10m x 0.030kg/m) + (54m x 0.065kg/m) + (30m x 0.115kg/m) = 7.26kg

MM-A0224HT