Panasonic S-36PN1E5 - Page 314

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1-304
Table 1-2 Tubing Data for Models (Single, Twin)
Models
Tubing Data
U-50PE1E5
U-60PEY1E5
U-71PEY1E5
Tubing size outer diameter
Liquid tube mm (in.) 6.35 (1/4) 9.52 (3/8)
Gas tube mm (in.) 12.7 (1/2) 15.88 (5/8)
Limit of tubing length
(m) 40 50 *
3
Limit of elevation difference
between the 2 units
Outdoor unit is placed
higher
(m)
(m)
30 30
Outdoor unit is placed
lower (m)
15 15
Max. allowable tubing length at shipment
3 – 30 3 – 20
Required additional refrigerant
(g/m) 20 *
2
40 *
1
Refrigerant charged at shipment
(kg) 1.65 1.7
No additional charge of compressor oil is necessary.
*
1
If total tubing length becomes 20 to 50 m, charge additional refrigerant by 40 g/m.
*
2
If total tubing length becomes 30 to 40 m, charge additional refrigerant by 20 g/m.
*
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
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)
= 40 × (a) + 20 × (b) – 400*
1
(60 – 71 types)
*1
50 Type of outdoor unit is 600 g.
*1
In case of twin connection, 71 type of outdoor unit is 400 g.
(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 (60 – 71 types)
(b) Total length of distribution tubing (ø6.35) Refrigerant charge per 1 m of actual length = 20 g/m
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 : 25 m × 40 g / m = 1000
ø6.35 →
1 – 2 : (5 + 10) m
×
20 g / m = 300
Outdoor unit charge-less refrigerant amount
– 400
+900
Total
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
2
1
Outdoor unit
L
Indoor unit (36 type × 2)
Main tubing (L)
Indoor unit connection tube
(
1, 2)
3671
71
Type capacity of indoor unit
ø12.7
ø15.88
ø15.88Gas tube
ø6.35ø9.52
ø9.52Liquid tube
Amount of additional charge per 1 m 40 g 40 g 20 g
SM830211-07PAC-i.indb304SM830211-07PAC-i.indb304 2013/09/1722:48:012013/09/1722:48:01