Panasonic S-36PU1E5A Technical Data & Service Manual page 266

1
Table 1-2 Tubing Data for Models (Single, Twin)
Tubing Data
Tubing size outer diameter
Limit of tubing length
Limit of elevation difference
between the 2 units
Max. allowable tubing length at shipment
Required additional refrigerant
Refrigerant charged at shipment
No additional charge of compressor oil is necessary.
If total tubing length becomes 20 to 50 m, charge additional refrigerant by 40 g/m.
* 1
If total tubing length becomes 30 to 40 m, charge additional refrigerant by 20 g/m.
2
*
* 3 In case of single connection, limit of tubing length is 50 m.
In case of twin connection, limit of tubing length is 40 m.
Table 1-3 Connection Tube Sizes
Type capacity of indoor unit
Gas tube
Liquid tube
Amount of additional charge per 1 m
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
50 Type of outdoor unit is 600 g.
*1
In case of twin connection, 71 type of outdoor unit is 400 g.
*1
(Use with the current refrigerant charge.)
(a) Actual length (m) of main tubing (ø9.52)
(b) Total length of distribution tubing (ø6.35)
Example
Sample tubing lengths
L = 25 m 1 = 5 m
2 = 10 m
Find the liquid tube size from Table 1-3.
L : ø9.52 (71 type)
1 – 2 : 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
ø6.35 → 1 – 2
Outdoor unit charge-less refrigerant amount
The amount of additional on-site refrigerant charge is 900 g.
Note: For type 50, the additional refrigerant charge for tubing length (c) of 30 to 40 m is the following:
Additional refrigerant amount (g) = 20 × (c) – 600
Liquid tube
Gas tube
Outdoor unit is placed
higher
Outdoor unit is placed
lower
Main tubing (L)
ø15.88
ø9.52
40 g
– Outdoor unit charge-less refrigerant amount (g)
= 40 × (a) + 20 × (b) – 400*
× 40 g / m = 1000
: 25 m
× 20 g / m =
: (5 + 10) m
Total
Models
U-50PE1E5
mm (in.) 6.35 (1/4)
mm (in.) 12.7 (1/2)
(m) 40
30
(m)
15
(m)
(m) 3 – 30
2
(g/m) 20 *
(kg) 1.65
Indoor unit connection tube
( 1, 2)
71 71
ø15.88
ø9.52
40 g
1 (60 – 71 types)
Refrigerant charge per 1 m of actual length = 40 g/m (60 – 71 types)
Refrigerant charge per 1 m of actual length = 20 g/m
300
–400
+900
1-256
U-60PEY1E5
U-71PEY1E5
9.52 (3/8)
15.88 (5/8)
3
50 *
30
15
3 – 20
1
40 *
1.7
36
ø12.7
ø6.35
20 g
Outdoor unit
L
1 2
Indoor unit (36 type × 2)
g
( )