Adding Refrigerant - Toshiba MMY-MAP0724HT6UL Service Manual

Adding refrigerant

After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging of
refrigerant.
Calculation of additional refrigerant charge amount
Additional refrigerant charge
amount
Table 3
Liquid pipe outer dia.
Additional refrigerant amount / 1 ft (lb)
Table 4
Outdoor unit capacity type
072 type
096 type
114 type
144 type
168 type
192 type
228 type
Example:
(114 type)
L1
a
L1 Ø1/2: 30 ft
a Ø1/4: 10 ft
Additional charge amount (lb)
Actual length of liquid
=
(lb)
pipe
Ø1/4
0.017
Adjustment amount of refrigerant
L3
L2
b c
L2 Ø1/2: 15 ft
b Ø3/8: 15 ft
×
=
(Lx 0.017 lb/ft) + (Ly
×
=
((a+c+d) 0.017 lb)+((L3+b)
× ×
=
(30 0.017 lb) + (25
=
20.06 lb
Lx : Actual total length of liquid pipe Ø1/4 (ft)
Ly : Actual total length of liquid pipe Ø3/8 (ft)
Lz : Actual total length of liquid pipe Ø1/2 (ft)
Additional refrigerant charge
×
amount per liquid pipe 1ft
[Table 3]
Ø3/8 Ø1/2
0.037 0.071
(lb)
3.31
13.23
15.43
0.00
16.53
27.56
27.56
d
L3 Ø3/8: 10 ft
c Ø1/4: 10 ft
×
0.037 lb/ft) + (Lz X 0.071 lb/ft) + (15.43 lb)
× ×
0.037 lb)+((L1+L2) 0.017 lb+(15.43 lb)
×
0.037 lb) + (45 0.071 lb) + (15.43 lb)
13
Adjustment amount of
+
refrigerant
Ø5/8 Ø3/4
0.108 0.168
Combined outdoor units
072 type –
096 type –
114 type –
072 type 072 type
096 type 072 type
096 type 096 type
114 type 114 type
d
[Table 4]
Ø1/4: 10 ft