32
Test Operation
Cooling, Heat pump type
Calculate the additional amount of refrigerant from the additional amount of refrigerant (A) by the pipe diameter on
the liquid side, the pipe length to be connected, and the corrective amount of refrigerant (B) according to Indoor
unit horsepower, and the corrective amount of refrigerant (C) according to sys
tem horsepower.
(A)
First, enter the total length for each liquid pipe
diameter in the following table, and then calculate the additional amount of refrigerant by
pipe length.
<Additional amount of refrigerant by pipe length>
Next, refer to the following table for the corrective amount of refrigerant (B) according to indoor unit horsepower.
<According to indoor unit horsepower>
kg/HP
HP
kg
Lastly, add the additional amount of refrigerant by pipe length (A) and the correcti
ve amount of refrigerant by indoor unit horsepower (B)
to the corrective amount of refrigerant by combined horsepower (C). This is the final additional amount of refrigerant.
If a minus sign is indicated as the result, do not reduce or add the refrigerant (= 0 kg).
<Additional amount of refrigerant>
Additional amount
of refrigerant
Actual liquid pipe length x Additional amount
of refrigerant per 1 m of l
iquid pipe
Corrective amount of refrigerant
according to
system horsepower
Corrective amount of refrigerant
according to indoor unit horsepower
=
+ +
0.025 x 1.2 x
0.055 x 1.2 x
0.105 x 1.2 x
0.160 x 1.2 x
0.250 x 1.2 x
0.350 x 1.2 x
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Ø19.0
Ø22.2
= kg
kg
kg
kg
kg
kg
kg
kg
kg
kg
=
(B)
Pipe diameter on the
liquid side
Standard amount of
refrigerant
Standard Indoor
uni
Fresh Air intake
Indoor unit
Air to Air Heat Exchanger
with DX-coil
Total
pipe length on each
liquid side
m
Additional amount of refrigerant pipe
diameter on each liquid side
kg
=
=
=
=
HP
kg
HP
kg
HP
kg
Additional refrigerant charge amount Indoor unit
Additional refrigerant charge amount
Capacity of Indoor unit
Corrective amount of refrigerant
0.4
0.2 0.2
Additional amount of refrigerant by pipe length (A) kg
Corrective amount of refrigerant according to indoor unit horsepower (B) kg
Corrective amount of refrigerant according to combined horsepower (C) kg
Additional amount of refrigerant kg
(C)
Next, refer to the Table 1-1~1-5 on P. 20 " Adding refrigerant" for the corrective amount of refrigerant (C) according to system
horsepower.
Checklist 2
Check the additional amount of refrigerant.
<Setup Remote Controller>
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