CyberOne EC DX IOM Manual
Wrap wet rags around the pipes between the areas to be
brazed and any nearby refrigeration components to keep
excessive heat from traveling through the pipe and causing
damage. Clear all pipe connections of debris and prepare
connections for brazing. Use only “L” or “K” grade refrigerant
copper piping. Be careful not to allow solder/piping debris
to get inside refrigerant lines. Dry nitrogen should be flowing
through the tubing while brazing at a rate of not less than 1-2
CFM (0.03-0.06 m
3
/minute).
If your system is designed for R407C refrigerant, use Silfos
alloy for copper-to-copper (piping liquid line or suction line).
Silver Solder (Safety-Silv #45) and flux are to be used for
copper-to-brass or copper-to steel.
Refrigerant lines for split systems must be sized according to
the piping distance between the A/C unit and the condenser/
condensing unit. Each valve, fitting and bend in the refrigerant
line must be considered in this calculation. Pipe sizes are
given for “equivalent feet”, not linear feet. Do not confuse
the terminologies. For example, a 7/8” standard 90° elbow
has an equivalent length of 1.5 ft; a 7/8” branch Tee has
an equivalent length of 3.5 ft. These corrections must be
accounted for when sizing your piping.
Refer to the following table provided for determining the
standard equivalent lengths, in feet, of straight pipe.
Equivalent Length (Feet) of Straight Pipe
O.D. (in.)
Line Size
Globe
Valve
Angle
Valve
90º
Elbow
45º
Elbow
Tee
Line
Tee
Branch
1/2
9.0
5.0
0.9
0.4
0.6
2.0
5/8
12
6.0
1.0
0.5
0.8
2.5
7/8
15
8.0
1.5
0.7
1.0
3.5
1 1/8
22
12
1.8
0.9
1.5
4.5
1 3/8
28
15
2.4
1.2
1.8
6.0
1 5/8
35
17
2.8
1.4
2.0
7.0
2 1/8
45
22
3.9
1.8
3.0
10
2 5/8
51
26
4.6
2.2
3.5
12
3 1/8
65
34
5.5
2.7
4.5
15
3 5/8
80
40
6.5
3.0
5.0
17
Refer to the following refrigerant line size tables for
recommended line sizing:
Recommended Discharge Line Sizes
Model No./ Total
Unit BTU/H
Capacity
* Equivalent Length in Feet
50 or less
100 or less
150 or less
024 / 24,000
5/8
7/8
7/8
042 / 42,000
7/8
7/8
7/8
060 / 60,000
7/8
1-1/8
1-1/8
096 / 96,000
1-1/8
1-1/8
1-3/8
120D / 120,000
1-1/8
1-3/8
1-3/8
Recommended Liquid Line Size
Model No./ Total
Unit BTU/H
Capacity
*Equivalent Length in Feet
50 or less 100 or less 150 or less
024 / 24,000
3/8
1/2
1/2
042 / 42,000
1/2
5/8
5/8
060 / 60,000
1/2
5/8
5/8
096 / 96,000
1/2
7/8
7/8
120 / 120,000
7/8
7/8
7/8
CAUTION
Do not exceed the maximum line lengths for the
system configurations listed below:
RCU with Hot Gas Bypass ....................... 50 ft
Remote Condensing Unit. ........................ 100 ft
Remote Air Cooled Condenser .............. 150 ft
Recommended Suction Line Size
Model No./
Total Unit
BTU/H
Capacity
*Equivalent Length in Feet
50 or less
100 or less
H
V
H
V
024 / 24,000
7/8
7/8
7/8
7/8
042 / 42,000
1-1/8
1-1/8
1-1/8
1-1/8
060 / 60,000
1-1/8
1-1/8
1-1/8
1-1/8
096 / 96,000
1-3/8
1-3/8
1-3/8
1-3/8
120/ 120,000
1-1/8
1-1/8
1-1/8
1-1/8
H=Horizontal Run V= Vertical Run
*Equivalent ft accounts for the linear pipe length as well as
equivalent length of Valves, Elbows and Tee’s as shown in
the preceding line size tables.
Vertical runs are based on a total rise of 30 equivalent ft.
For longer rises, individual calculations should be made.
Sizes assume the use of single risers; double rises may be
necessary.
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