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Maximum allowable length
• Between outdoor and indoor units (standard multi/free multi combinations)
Actual piping
540 ft.
length
(165 m)
Equivalent length
623 ft.
(a)
(190 m)
(b)
Total piping length 3280 ft.
(1000 m)
(a) Assume equivalent piping length of REFNET joint = 1.6 ft. (0.5 m) and REFNET header = 3.3 ft. (1 m) (for calculation purposes).
(b) When the equivalent pipe length between outdoor and indoor units is 295 ft. (90 m) or more, the size of the main pipes (both gas side and liquid
side) must be increased. Depending on the length of the piping, the capacity may drop, but even in such a case it is possible to increase the size
of the main pipes.
Even as the length of the piping is less than 295 ft. (90 m), it is able to increase the diameter of piping to improve performance.
2
3
1
4
Size up for equivalent length for outdoor-indoor units over 295ft. (90m)
Outdoor unit capacity type
RXYQ72A type
RXYQ96A type
RXYQ120A type
RXYQ144A type
1-1/8 in. (28.6 mm) → 1-1/4 in. (31.8 mm)*
RXYQ168-216A type
RXYQ240A type
RXYQ264-336A type
1-3/8 in. (34.9 mm) → 1-1/2 in. (38.1 mm)*
RXYQ360-480A type
*1 If size is NOT available, increase is NOT allowed.
• Between outdoor branch and outdoor unit (in case of multi outdoor units).
(only in case ≥264 type)
Actual piping length
33 ft. (10 m)
Equivalent length
43 ft. (13 m)
Maximum allowable height difference
H1
≤164 ft. (50 m ) (if outdoor is located below indoor units, ≤130 ft. (40 m))
≤130ft. (40m)
H2
(b)
≤16 ft. (5 m)
H3
(a) It can be extended up to (361ft.) 110 m without an additional option kit by meeting the following conditions.
1.1 Increasing the size of liquid piping of main pipe only (see table Size up for equivalent length for outdoor-indoor units over 295ft. (90m).
1.2 Dedicated setting on outdoor unit is required.
If the outdoor location is higher than the indoor unit, see [2-49]= on page 39, and if the outdoor location is lower than the indoor unit, see
[2-35]= on page 38.
2. In the case where the equivalent piping length from outdoor units to indoor units ≥295 ft. (90 m) and Height difference between outdoor unit
and indoor unit (H1): >295 ft. (90 m), make sure to double upsize the liquid pipe of the main pipe, referring to the table A below. And, make
sure to upsize the gas pipe of the main pipe, referring to the table Size up for equivalent length for outdoor-indoor units over 295 ft. (90 m)
(In this case, system additional refrigerant amount (R)* must not exceed the values provided in the table C below and Height difference
between outdoor unit and indoor unit (H1) must be less than 361 ft. (110 m). ).
* As for (R), see 14.2. Calculating the additional refrigerant charge on page 30.
English
Example 1.1
unit 8: a+b+c+d+e+f+g+p≤540 ft. (165 m)
Example 2.1
unit 8: a+b+c+d+e+f+g+p≤540 ft. (165 m)
—
Example 1.1
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤3280 ft. (1000 m)
Example 2.1
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤3280 ft. (1000 m)
5
1 Outdoor unit
2 Main pipes (outdoor unit to first refrigerant branch kit)
3 Increase
4 First refrigerant branch kit
5 Indoor unit
Gas pipe
3/4 in. (19.1 mm) → 7/8 in. (22.2 mm)
7/8 in. (22.2 mm) → 1 in. (25.4 mm)*
Increase is NOT allowed
Increase is NOT allowed
Increase is NOT allowed
Example 3
s≤33 ft. (10 m)
t≤33 ft. (10 m)
—
Example 1.2.1
unit 6: a+b+h≤540 ft. (165 m)
unit 8: a+i+k≤540 ft. (165 m)
—
Example 1.2.1
a+b+c+d+e+f+g+h+i+j+k
≤3280 ft. (1000 m)
Liquid pipe
3/8 in. (9.5 mm) → 1/2 in. (12.7 mm)
1
1/2 in. (12.7 mm) → 5/8 in. (15.9 mm)
1
5/8 in. (15.9 mm) → 3/4 in. (19.1 mm)
1
3/4 in. (19.1 mm) → 7/8 in. (22.2 mm)
(a)
Example 1.3
unit 8: a+i≤540 ft. (165 m)
—
Example 1.3
a+b+c+d+e+f+g+h+I
≤3280 ft. (1000 m)
14
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