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1-9. Tubing Length
Table 1-16 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
R410A distribution joint
APR-P160BA (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 (ft.)
L1 Max. tubing length
Actual length 492
Equivalent length 574
L (L2 – L3)
Difference between max. length and min.
131
length from the No.1 distribution joint
1
,
2
...
n
Max. length of each distribution tube 98
1
+
2
+...
n–1
Total max. tubing length including length of
656
each distribution tube (only narrow tubing)
H1
When outdoor unit is installed higher than indoor unit 164
When outdoor unit is installed lower than indoor unit 131
H2 Max. difference between indoor units 49
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.
07-056 Mini_ECOi_II_NA 3/19/07 2:40 PM Page 12