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R410A distribution joint
APR-CHP680BA (for outdoor unit)
APR-CHP1350BA (for outdoor unit)
APR-P160BA (for indoor unit)
APR-P680BA (for indoor unit)
APR-P1350BA (for indoor unit)
Explanation of symbols
Distribution joint
(APR: purchased separately)
Solidly welded shut
(pinch weld)
Balance tubing
(ø1/4
")
Main distribution tubes LC – LG are selected according to the capacity after the distribution joint.
The outdoor connection main tubing ( B portion) is determined by the total capacity of the outdoor units that are connected to the tube ends.
Sizes of indoor unit connection tubing 1 – 40 are determined by the connection tubing sizes on the indoor units.
Main tu
bing length LM = LA + LB … ≤ 262 ft
1.
2.
3.
4.
Ball valve (field supply)
T- j o i nt (field supply)
Note: Do not use commercially available T-joints for the liquid tubing and parts.
* Be sure to use special R410A distribution joints (APR: purchased separately) for outdoor unit connections and tubing branches.
L5
LA
LE
LM
LB LC
L2
L4
LF
LD L3
LG
Max. 1.3 ft
Max. 1.3 ft
For
extension
For
extension
H2
H3
H1
L1
2
3
1
5
4
A
B
38
39
40
1-5. Tubing Length
Table 1-8 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown in the figure below.
Item Mark Contents Length (ft.)
L1 Max. tubing length
Actual length 492
Equivalent length 574
∆L (L2 – L4)
Difference between max. length and min.
length from the No.1 distribution joint
131
LM Max. length of main tubing (at max. diameter) 262
1
1
2
,
2
...
...
Max. length of each distribution tube 98
L1+
+
+
Total max. tubing length including length of
each distribution tube (only liquid tubing)
984
A
+LE+LF+LG
L5
L3
Distance between outdoor units
32
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
H3 Max. difference between outdoor units
13
L = Length, H = Height
Allowable tubing
length
>
>
Allowable elevation
difference
>
>
>
>
>
>
>
>
>
>
*3
6.6
40
39
Allowable length of
joint tubing
T-joint tubing (field-supply); Max. tubing length between
the first T-joint and solidly welded-shut end point
1: The outdoor connection main tubing ( B portion) is determined by the total capacity of the outdoor units that are connected to
the tube ends.
2: If the longest tubing length (L1) exceeds 295 ft. (equivalent length), increase the sizes of the main tubes (LM) by 1 rank for gas
tubes and liquid tubes. (Use a field supply reducer.) (Select the tube size from the table of main tube sizes (Table 1-9) on the
following page (LA table), and from the table of refrigerant tubing sizes (Table 1-14) on the second following page.)
3: If the longest main tube length (LM) exceeds 164 ft., increase the main tube size at the portion before 164 ft. by 1 rank for the
gas tubes. (Use a field supply reducer.)
(For the portion that exceeds 164 ft., set based on the main tube sizes (LA) listed in the table on the following page.)
4: If the size of the existing tubing is already larger than the standard tubing size, it is not necessary to further increase the size.
* If the existing tubing is used, and the amount of on-site additional refrigerant charge exceeds the value listed below, then
change the size of the tubing to reduce the amount of refrigerant.
Max. additional charge for 1 outdoor unit: 62 lbs
Max. additional charge for 2 outdoor units: 111lbs
NOTE
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