1
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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
(k
g
)
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
(Type 60 – 71)
*1
Type 50 of outdoor unit is 600
g
.
*1
In case of twin connection, Type 71 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 (Type 60 – 71)
(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 (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
× 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 (Type 36 × 2)
Main tubing (L)
Indoor unit connection tube
( 1, 2)
36
71
71
Type capacity of indoor unit
ø12.7
ø15.88
ø15.88
Gas tube
ø6.35
ø9.52
ø9.52
Liquid tube
Amount of additional charge per 1 m
40
g
40
g
20
g
SM830231-02̲Single̲欧州.indb 277
SM830231-02̲Single̲欧州.indb 277
2014/09/19 13:21:45
2014/09/19 13:21:45