Toshiba MMY-MAP0726FT2P-UL Installation Manual page 16

■ Calculation of additional refrigerant charge amount
Additional refrigerant charge amount (lbs) = [1] + [2]
[1]. Compensation by capacity of outdoor unit (Table1)
[2]. (Actual length of liquid pipe × Additional refrigerant charge amount per liquid pipe 1 ft (Table2)) × 1.3
NOTE
If the additional refrigerant amount indicates minus as the result of calculation, use the air conditioner without
additional refrigerant.
(Table1) Compensation by capacity of outdoor unit
Outdoor unit Model name
capacity type (Standard Model)
072 type MMY-MAP0726FT2P-UL
144 type MMY-MAP1446FT2P-UL
(Table2) Actual length of liquid pipe × Additional refrigerant charge amount per liquid pipe 1 ft
Liquid pipe outer diameter
Additional refrigerant amount
29-EN
1122001201_EN FR.indd 15 1122001201_EN FR.indd 15
Compensation by
capacity type outdoor unit
(lbs)
4.4
6.6
(in) Ø1/4" Ø3/8" Ø1/2" Ø5/8"
lbs/ft 0.017 0.037 0.071 0.108
– 15 –
Example:
072 type (MMY-MAP0726FT2P-UL)
L2 L3
L1
L4
L6
L5
036 type 024 type
Pipe Liquid pipe size
L1 Ø1/2"
L2 Ø3/8"
L3 Ø3/8"
L4 Ø3/8"
L5 Ø3/8"
L6 Ø3/8"
L7 Ø1/4"
Additional refrigerant charge amount(lbs) = [1] + [2]
= 4.4 lbs + 5.395 lbs
= 9.795 lbs
[1]. Compensation by capacity of outdoor unit (Table1)
= Compensation by 072 type
= 4.4 lbs
[2]. (Actual length of liquid pipe × Additional refrigerant charge amount per liquid pipe 1 ft (Table2)) × 1.3
= (Lx × 0.017 lbs/ft + Ly × 0.037 lbs/ft + Lz × 0.071 lbs/ft) × 1.3
= ((L7) × 0.017 lbs/ft + (L2+L3+L4+L5+L6) × 0.037 lbs/ft+(L1) × 0.071 lbs/ft) × 1.3
= ((10 ft) × 0.017 lbs/ft + (50 ft) × 0.037 lbs/ft+(30 ft) × 0.071 lbs/ft) × 1.3
= (0.17 lbs + 1.85 lbs + 2.13 lbs) × 1.3
= (4.15 lbs ) × 1.3
= 5.395 lbs
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)
L7
012 type
Actual Piping length
30 ft
15 ft
10 ft
10 ft
5 ft
10 ft
10 ft
30-EN
9/9/16 9:05 AM 9/9/16 9:05 AM