10
1-9. Tubing Length
Table 1-10 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
R410A distribution joint
APR-RP160AG (for indoor unit)
Note: Do not use commercially available T-joints for the liquid tubing.
H2
LD
L1
L2
LCLB
LA
* Be sure to use special R410A distribution joints (APR: purchased separately) for outdoor
unit connections and tubing branches.
Main tube of unit
1st branch
Unit distribution tube
1
2 3
n-1
n
L3
H1
Items Marks Contents Length (m)
L1 Max. tubing length
Actual length 150
Equivalent length 175
L (L2 – L3)
Difference between max. length and min.
40
length from the No.1 distribution joint
1
,
2
~
n
Max. length of each distribution tube 30
1
+
2
+~
n–1
Total max. tubing length including length of
200
each distribution tube (only narrow tubing)
H1
When outdoor unit is installed higher than indoor unit 50
When outdoor unit is installed lower than indoor unit 40
H2 Max. difference between indoor units 15
L = Length, H = Height
Allowable tubing
length
>
>
Allowable elevation
difference
>
>
>
>
>
>
+L1
Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown
in the figure below.
05-194 5/27/05 5:06 PM Page 10
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