Panasonic S-36PU1E5A Service Manual page 287

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
Type 50 of outdoor unit is 600 g.
*1
In case of twin connection, Type 71 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 (Type 71)
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 : 25 m
ø6.35 → 1 – 2 : (5 + 10) m
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
Models
Liquid tube mm (in.)
Gas tube mm (in.)
(m)
Outdoor unit is placed
higher (m)
Outdoor unit is placed
lower (m)
(m)
(g/m)
(kg)
Main tubing (L)
71
ø15.88
ø9.52
40 g
– Outdoor unit charge-less refrigerant amount (g)
= 40 × (a) + 20 × (b) – 400*
Refrigerant charge per 1 m of actual length = 40 g/m (Type 60 – 71)
Refrigerant charge per 1 m of actual length = 20 g/m
× 40 g / m = 1000
× 20 g / m =
300
–400
Total +900
U-60PEY1E5
U-50PE1E5
U-71PEY1E5
6.35 (1/4) 9.52 (3/8)
12.7 (1/2) 15.88 (5/8)
40 50 *
30 30
15 15
3 – 30 3 – 20
2
20 * 40 *
1.65 1.7
Indoor unit connection tube
( 1, 2)
71 36
ø15.88 ø12.7
ø9.52 ø6.35
40 g 20 g
1 (Type 60 – 71)
Outdoor unit
Indoor unit (Type 36 × 2)
1-277
3
1
L
1 2
1
g
( )