22
TM-FT
-0415-B
Outdoor Unit
L
E
Indoor Unit
Refrigerant Piping
Piping Length & Elevation
If the pipe is too long, both the capacity and reliability of the unit will drop. As the number of bends
increases, resistance to the flow of refrigerant system increases, thus lowering cooling capacity.
As a result, the compressor may become defective. Always choose the shortest path and follow the
recommendations as tabulated below:
Model
Indoor
FT10LV1L/M
FT10MV1I/J
R09CV1
FT15LV1L/M
FT15MV1I/J
R15CV1
FT25LV1L/M
FT25MV1I/J
R25CV1
FT311V1L/M
FT20LV1L/M
FT20MV1I/J
3
20
12
15
25
37
5
9.50 (3/8”)
6.35 (1/4”)
6.35 (1/4”)
9.50 (3/8”)
12.70 (1/2”)
15.88 (5/8”)
8
Outdoor
Min. Allowable Length (L), m
Max. Allowable Length (L), m
Additional Charge of Refrigerant (g/m)
Max. Allowable Elevation (E), m
Gas Pipe Size, mm / (in)
Liquid Pipe Size, mm / (in)
Example:
FT10LV1L & R09CV1 with 12m piping length, additional piping length is 4.5m. Thus,
Additional charge = 4.5m x [20g/m]
= 90 [g]
* Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance.
Remark:
The refrigerant pre-charged in the outdoor unit is for piping length up to 7.5m.
For R410A :
For R22:
Indoor Unit
FTN10PV1L/M
FTN10MV1I9/J9
RN10FV1
FTN15PV1L/M
FTN15MV1I9/J9
RN15FV1
FTN20PV1L/M
FTN20MV1I9/J9
RN20CV1
FTN25PV1L/M
FTN25MV1I9/J9
RN25CV1
FTN311V1L/M
RN28CV1
Outdoor Unit
25
33
8
9.50 (3/8")
9.50 (3/8")
Model
Liquid Pipe Size, mm / (in)
15
3
30
20
12.70 (1/2")
6.35 ( 1/4")
15.88 (5/8")
25
18
Additional Charge of Refrigerant (g/m)
Min. Allowable Length (L),m
Gas Pipe Size, mm / (in)
Max. Allowable Elevation (E), m
Max. Allowable Length (L), m
R18CV1
R20CV1
R31CV1
