Toshiba MMY-MAP1006FT8(J)P-E Service Manual page 99

Checklist 2
• Check the additional amount of refrigerant.
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 (C) according to system
horsepower.
Additional amount Actual liquid pipe length × Additional amount
=
of refrigerant
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>
Pipe diameter on the liquid
side
φ6.4 0.025 ×
φ9.5
0.055 ×
φ12.7
0.105 ×
φ15.9
0.160 ×
φ19.0 0.250 ×
φ22.2
0.350 ×
Next, refer to the following table for the corrective amount of refrigerant (C) according to system horsepower.
<Corrective amount of refrigerant according to system horsepower>
System HP Combined outdoor units
(HP)
8 8
10 10
12 12
14 14
16 16
18 18
20 20
22 12
24 14
26 14
28 14
30 16
32 18
34 18
36 18
38 20
40 20
42 14
44 16
46 18
48 18
50 18
52 18
54 18
Lastly, add the additional amount of refrigerant by pipe length (A) 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 by pipe length (A) kg
Corrective amount of refrigerant according to combined horsepower (C) kg
Additional amount of refrigerant kg
of refrigerant per 1 m of liquid pipe
(A)
Standard amount of Total pipe length on each liquid side
refrigerant
Additional amount of refrigerant by pipe
length (A)
Compensation
by system HP
(HP)
(kg)
2
3
8
10
12
14
15
10 6
10 8
12 12
14 12
14 14
14 15
16 16
18 18
18 22
20 24
14 14 14
14 14 15
14 14 16
16 14 17
18 14 18
18 16 20
18 18 22
Corrective amount of refrigerant
+
X 1.3
according to systemt horsepower
Additional amount of refrigerant pipe diameter on
each liquid side
m
=
=
=
=
=
=
kg
kg
kg
− 98 −
(C)
kg
kg
kg
kg
kg
kg
kg
kg