Sanyo Big PACi 18 Series - Page 122

1
1-117
Table 1-3 Connection Tube Sizes (Twin, Triple, Double-Twin)
Main tubing (L)
Double-Twin distribution tube (L1, L2)
Indoor unit connection tube
( 1, 2, 3, 4)
Total type capacity of indoor unit connected after
the branch
Type capacity of indoor unit 70 90 36 – 48 25 – 48 18
Gas tube ø25.4 ø15.88 ø15.88 ø12.7
Liquid tube ø9.52 ø12.7 ø9.52 ø9.52 ø6.35
Amount of additional charge per 1 m
40 g 80 g 40 g 20 g
Charge with the amount of additional refrigerant calculated using the formula below, based on the values in Table 1-3 and the
size and length of the liquid tubing.
Amount of additional refrigerant charge (g)
Do not remove refrigerant from the system, even if the result of the calculation is negative.
Additional refrigerant amount (g) = Additional refrigerant for main tubing (g) + Additional refrigerant for distribution tubing (g)
– Outdoor unit charge-less refrigerant amount (g)
= 40X (a) + 40X (b) + 20X (c) – 1200 (70 type)
Additional refrigerant amount (g) = Additional refrigerant for main tubing (g) + Additional refrigerant for distribution tubing (g)
– Outdoor unit charge-less refrigerant amount (g)
= 80X (a) + 40X (b) + 20X (c) – 2400 (90 type)
(Use with the current refrigerant charge.)
(a) Actual length (m) of main tubing (ø9.52) Refrigerant charge per 1 m of actual length = 40 g/m
Actual length (m) of main tubing (ø12.7) Refrigerant charge per 1 m of actual length = 80 g/m
(b) Total length of distribution tubing (ø9.52) Refrigerant charge per 1 m of actual length = 40 g/m
(c) Total length of distribution tubing (ø6.35) Refrigerant charge per 1 m of actual length = 20 g/m
Example: 70 Type
Sample tubing lengths
L = 35 m
1 = 5 m
L1 = 10 m 2 = 5 m
L2 = 5 m 3 = 5 m
4 = 10 m
Find the liquid tube size from Table 1-3.
L : ø9.52 (70 type)
L1 : ø9.52 (Total type capacity of indoor unit 36)
L2 : ø9.52 (Total type capacity of indoor unit 36)
1 – 4 : ø6.35
The amount of additional on-site refrigerant charge is found
by subtracting the outdoor unit charge-less refrigerant amount
from the total charge amount for all tube sizes.
ø9.52 L : 35 m
×
40 g / m = 1400
ø9.52 L1 + L2 : (10 + 5) m
×
40 g / m = 600
ø6.35 1 –
4 : (5 + 5 + 5 + 10) m
×
20 g / m = 500
Outdoor unit charge-less refrigerant amount –1200
Total +1300
The amount of additional on-site refrigerant charge is 1,300 g.
Table 1-4
Outdoor Unit Type 70 Type 90 Type
Outdoor Unit Amount of
Chargeless Refrigerant
1200 g 2400 g
L
L1
L2
4
3
21
Outdoor unit (70 Type)
Indoor unit (18 type × 4)
40 g
SM830161Book.indb117SM830161Book.indb117 2008/06/039:08:112008/06/039:08:11