3
4
REFRIGERANT PIPING
3. REFRIGERANT PIPING
3.1. PIPING CONNECTION
3.1.1. PIPING POSITION
3.1.2. SIZE OF PIPING CONNECTION
In case of R407C / R410A
(mm)
Model RPF(I)
1.0 / 1.5
2.0
2.5
o
Gas Piping
12.70 (5/8)
15.88 (5/8)
15.88 (5/8)
p
Liquid Piping
6.35 (1/4)
6.35 (1/4)
9.53 (3/8)
q
Drain Piping
18,5 OD
18,5 OD
18,5 OD
Special instructions for R410A
As R410 pressure is about 1.4 times higher than R407C,
improper installation may cause a serious trouble.
It is necessary to use the copper pipes, size of flare pipe ends
and flare nuts as shown below.
Thickness of Copper Pipes
(mm)
Nominal
Diameters
Outer
Diameters
R407C
R410A
1/4
6.35
0.80
0.80
3/8
9.53
0.80
0.80
1/2
12.70
0.80
0.80
5/8
15.88
1.00
1.00
Flare Pipe Dimensions
(mm)
A
+0/-0.4
Nominal
Diameters
Outer
Diameters
R407C
R410A
1/4
6.35
9.0
9.1
3/8
9.53
13.0
13.2
1/2
12.70
16.2
16.6
5/8
15.88
19.4
19.7
Flare Nut Dimensions
(mm)
B
Nominal
Diameters
Outer
Diameters
R407C
R410A
1/4
6.35
17
17
3/8
9.53
22
22
1/2
12.70
24
26
5/8
15.88
27/29
29
4. DRAIN PIPING
4.1. GENERAL
CAUTION:
-
Do not create an upper-slope or rise for the drain piping,
since drain water will flow back to the unit and leakage to
the room will occur when the unit operation is stopped.
-
Do not connect the drain pipe with sanitary or sewage
piping or any other drainage piping.
-
When the common drain piping is connected with other
indoor units, the connected position of each indoor unit
must be higher than the common piping. The pipe size of
the common drain pipe must be large enough according
to the unit size and number of unit.
-
Drain piping will require insulating if the drain is installed
in a location where condensation forming on the outside
of drain pipe may drop and cause damage. The
insulation for the drain pipe must be selected to insure
vapor sealing and prevent condensation forming.
-
Drain trap should be installed next to indoor unit. This
trap must be designed to good practice and be checked
with water (charged) and tested for correct flow. Do not
tie or clamp the drain pipe and refrigerant pipe together.
NOTE:
Install drainage in accordance with national and local
codes.
Piping Connection of RPF
Piping Connection of RPFI
Units mm
Units mm
Incorrect: Upward Slope
Incorrect: Rising Part
INCORRECT
Common Drain Piping
1/25~1/100 Down Slope
Drain Piping connection
CORRECT
