Toshiba MMY-MAP0806HT7(J)P, Service Manual

Page: 111 / 350

• Check the additional amount of refrigerant.
Checklist 2
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 system 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
Capacity of Indoor unit HP
Corrective amount of refrigerant kg
Lastly, add the additional amount of refrigerant by pipe length (A) and the corrective 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, d o not reduce or add the refrigerant (= 0 kg).
<Additional amount of refrigerant>
Additional amount
of refrigerant
=
Actual liquid pipe length × Additional amount
of refrigerant per 1 m of liquid pipe
+
Corrective amount of refrigerant
according to indoor unit horsepower
+
φ6.4 0.025 × 1.2 × = kg
φ9.5 0.055 × 1.2 × = kg
(B)
Pipe diameter on the liquid
side
Standard amount of
refrigerant
Total pipe length on each liquid side
m
Additional amount of refrigerant pipe diameter on
each liquid side
kg
φ19.0
0.250 × 1.2 × = kg
φ22.2 0.350 × 1.2 × = kg
φ12.7 0.105 × 1.2 × = kg
φ15.9 0.160 × 1.2 × = kg
HP HP HP
kg kg kg
Additional refrigerant charge amount Indoor unit
Standard Indoor
unit
Fresh Air intake
Indoor unit
Air to Air Heat Exchanger
with DX-coil
Additional refrigerant charge amount 0.4 0.2 0.2
Additional amount of refrigerant kg kg
Additional amount of refrigerant by pipe length (A) kg kg
Corrective amount of refrigerant according to indoor unit horsepower (B) kg kg
Corrective amount of refrigerant according to combined horsepower (C) kg kg
− 1 10 −
( 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.
Corrective amount of refrigerant
according to system horsepower